BMW Vehicle Models Z4 2018-present
BMW Vehicle Models Z4 2018-present Torque Specifications
Complete BMW Vehicle Models Z4 2018-present torque specifications guide. Includes factory-specified torque values, torque sequences, and technical specifications for all components including body, brakes, drivetrain, electrical, emissions sensors, fuel, exhaust, HVAC, and suspension. Essential information for proper assembly and maintenance.
Updated
Important Information
Safety guidelines and reference information for proper torque application
Safety First
- Always verify torque specifications with your vehicle's factory service manual
- Use properly calibrated torque wrenches
- Replace all torque-to-yield (TTY) bolts - they are single-use only
- When in doubt, consult a professional mechanic
Quick Reference Guide
Quick Reference Guide
ft-lbs → Nm
× 1.356
ft-lbs → kg-m
× 0.138
Nm → ft-lbs
× 0.738
in-lbs → ft-lbs
× 0.083
Common Torque Patterns
Star Pattern
Used for wheels and other circular bolt patterns
Cross Pattern
Used for gaskets and cover plates
Sequential Pattern
Used for head bolts and other critical components
Common Mistakes to Avoid
Common Mistakes to Avoid
Over-tightening
Exceeding the specified torque value can stretch or break fasteners, damage threads, or crack components.
Prevention:
Always use a calibrated torque wrench and follow specifications exactly.
Incorrect Torque Sequence
Tightening bolts in the wrong order can cause uneven pressure distribution and potential leaks or damage.
Prevention:
Follow the manufacturer's specified torque sequence pattern.
Dirty Threads
Dirt, rust, or old thread locker can affect torque readings and proper fastener tension.
Prevention:
Clean and inspect all threads before assembly. Use new thread locker if specified.
Reusing TTY Bolts
Torque-to-yield bolts are designed to stretch and must not be reused.
Prevention:
Always replace TTY bolts with new ones. They are single-use only.
Dry vs. Lubricated
Not accounting for whether torque specs are for dry or lubricated fasteners can lead to incorrect tension.
Prevention:
Check if specs are for dry or lubricated threads. Use specified lubricant when required.
Recommended Tools
Recommended Tools
Torque Wrench (1/4" Drive)
Range: 2-25 ft-lbs
Small fasteners, delicate components
Torque Wrench (3/8" Drive)
Range: 10-100 ft-lbs
Most common automotive fasteners
Torque Wrench (1/2" Drive)
Range: 30-250 ft-lbs
Large fasteners, wheels
Angle Gauge
Torque-to-yield (TTY) bolts
Torque Wrench Care
- Calibrate annually or after 5,000 clicks
- Store at lowest setting
- Keep clean and lubricated
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Torque Calculator
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2.0l Engine
Torque specifications for 2.0L Engine
2.0l Engine
Torque specifications for 2.0L Engine
Cylinder Head
1 Cylinder Head Bolts
M12 x 1.5
1
Cylinder Head Bolts
M12 x 1.5
Torque Specification
1. 15 ft-lbs (20 N·m)
2. 90°
3. 90°
Important Notes
Follow a specific torque sequence. Final torque involves angle tightening after initial ft-lbs value. Always replace these bolts.
2 Valve Cover Bolts
M6 x 1.0
2
Valve Cover Bolts
M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Do not over-tighten. Use a criss-cross pattern when tightening.
3 Camshaft Position Sensor Bolt
M6 x 1.0
3
Camshaft Position Sensor Bolt
M6 x 1.0
Torque Specification
7 ft-lbs (9 N·m)
Important Notes
Do not over-tighten, as sensor housing is fragile.
4 Rocker Arm Shaft Bolts
M8 x 1.25
4
Rocker Arm Shaft Bolts
M8 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Tighten evenly to avoid stress on the rocker arm shaft.
5 Variable Valve Timing (VANOS) Solenoid Bolts
M6 x 1.0
5
Variable Valve Timing (VANOS) Solenoid Bolts
M6 x 1.0
Torque Specification
7 ft-lbs (9 N·m)
Important Notes
Do not over-tighten. Use care when working with solenoid connectors.
6 High Pressure Fuel Pump Bolts
M8 x 1.25
6
High Pressure Fuel Pump Bolts
M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Tighten evenly to avoid warping the fuel pump flange.
Engine Block
1 Main Bearing Bolts
M10 x 1.5
1
Main Bearing Bolts
M10 x 1.5
Torque Specification
1. 45 ft-lbs (61 N·m)
2. 70°
Important Notes
Follow a specific torque sequence. This is a base torque plus angle. Use new bolts.
2 Crankshaft Position Sensor Bolt
M6 x 1.0
2
Crankshaft Position Sensor Bolt
M6 x 1.0
Torque Specification
7 ft-lbs (9 N·m)
Important Notes
Do not over-tighten. The sensor housing is often fragile.
3 Knock Sensor Bolt
M8 x 1.25
3
Knock Sensor Bolt
M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure sensor is seated properly for accurate readings.
4 Engine Mount Bolts to Engine
M12 x 1.75
4
Engine Mount Bolts to Engine
M12 x 1.75
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
These are critical bolts for engine safety and stability. Always ensure all engine mounts are correctly torqued.
5 Water Pump Bolts
M8 x 1.25
5
Water Pump Bolts
M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Tighten in a criss-cross pattern for even sealing.
6 Thermostat Housing Bolts
M6 x 1.0
6
Thermostat Housing Bolts
M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Do not over-tighten to avoid damage to the housing.
Connecting Rods
1 Connecting Rod Nuts
M9 x 1.0
1
Connecting Rod Nuts
M9 x 1.0
Torque Specification
1. 20 ft-lbs (27 N·m)
2. 60°
Important Notes
Use a specific torque sequence. This torque also has an angle specification. Use new nuts.
Crankshaft
1 Flywheel Bolts
M12 x 1.5
1
Flywheel Bolts
M12 x 1.5
Torque Specification
75 ft-lbs (102 N·m)
Important Notes
Always use new bolts. Tighten in a star pattern.
2 Crankshaft Pulley/Harmonic Balancer Bolt
M14 x 1.5
2
Crankshaft Pulley/Harmonic Balancer Bolt
M14 x 1.5
Torque Specification
1. 80 ft-lbs (108 N·m)
2. 90°
Important Notes
Always use a new bolt. Final torque involves an angle turn.
Oil System
1 Oil Pan Bolts
M6 x 1.0
1
Oil Pan Bolts
M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Tighten evenly to avoid warping the oil pan. Do not overtighten.
2 Oil Drain Plug Bolt
M14 x 1.5
2
Oil Drain Plug Bolt
M14 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Use a new crush washer to prevent leaks. Do not over-tighten.
3 Oil Filter Housing Bolt
M8 x 1.25
3
Oil Filter Housing Bolt
M8 x 1.25
Torque Specification
5 ft-lbs (7 N·m)
Important Notes
Do not over-tighten; use hand tight plus slight additional turn.
Timing System
1 Timing Belt/Chain Tensioner Bolt
M8 x 1.25
1
Timing Belt/Chain Tensioner Bolt
M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure correct tensioner operation after torqueing.
2 Camshaft Sprocket Bolt
M10 x 1.5
2
Camshaft Sprocket Bolt
M10 x 1.5
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
Always use new bolts. Tighten to the proper spec.
Intake System
1 Intake Manifold Bolts
M8 x 1.25
1
Intake Manifold Bolts
M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Tighten in a criss-cross pattern to prevent vacuum leaks.
2 Throttle Body Bolts
M6 x 1.0
2
Throttle Body Bolts
M6 x 1.0
Torque Specification
7 ft-lbs (9 N·m)
Important Notes
Do not over-tighten to prevent damage to the throttle body.
3 Intake Air Temperature Sensor Bolt
M6 x 1.0
3
Intake Air Temperature Sensor Bolt
M6 x 1.0
Torque Specification
7 ft-lbs (9 N·m)
Important Notes
Do not over-tighten to avoid damage to the sensor.
4 EGR Valve Bolts
M6 x 1.0
4
EGR Valve Bolts
M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Tighten evenly to ensure a proper seal.
5 Fuel Rail Bolts
M6 x 1.0
5
Fuel Rail Bolts
M6 x 1.0
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Tighten evenly to avoid fuel leaks.
6 Fuel Injector Bolts
M6 x 1.0
6
Fuel Injector Bolts
M6 x 1.0
Torque Specification
7 ft-lbs (9 N·m)
Important Notes
Do not over-tighten as the injectors may be brittle. Tighten evenly.
Exhaust System
1 Exhaust Manifold/Headers Bolts
M8 x 1.25
1
Exhaust Manifold/Headers Bolts
M8 x 1.25
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Tighten in a criss-cross pattern to ensure even sealing.
Cooling System
1 Water Pump Pulley Bolts
M6 x 1.0
1
Water Pump Pulley Bolts
M6 x 1.0
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Tighten evenly to prevent pulley vibration.
2 Coolant Temperature Sensor Bolt
M6 x 1.0
2
Coolant Temperature Sensor Bolt
M6 x 1.0
Torque Specification
7 ft-lbs (9 N·m)
Important Notes
Do not over-tighten to avoid damage to the sensor.
Electrical System
1 Ignition Coil Bolt
M6 x 1.0
1
Ignition Coil Bolt
M6 x 1.0
Torque Specification
7 ft-lbs (9 N·m)
Important Notes
Do not over-tighten as coil housings can be brittle.
Accessory Drive
1 Serpentine/Accessory Drive Belt Tensioner Bolt
M8 x 1.25
1
Serpentine/Accessory Drive Belt Tensioner Bolt
M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure the tensioner is functioning correctly after installation.
2 Drive Belt Idler Pulley Bolt
M10 x 1.5
2
Drive Belt Idler Pulley Bolt
M10 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Tighten securely to prevent pulley slippage.
3.0l Engine
Torque specifications for 3.0L Engine
3.0l Engine
Torque specifications for 3.0L Engine
Cylinder Head
1 Cylinder Head Bolts
M12 x 1.75
1
Cylinder Head Bolts
M12 x 1.75
Torque Specification
1. 15 ft-lbs (20 N·m)
2. 30 ft-lbs (41 N·m)
3. 90°
4. 90°
Important Notes
Torque in multiple stages using the specified sequence. Final stages are an angle. Estimated values, always refer to OEM manual.
2 Valve Cover Bolts
M6 x 1.0
2
Valve Cover Bolts
M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Torque bolts evenly to prevent gasket damage.
3 Rocker Arms/Shafts Bolts
M8 x 1.25
3
Rocker Arms/Shafts Bolts
M8 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure proper alignment of rocker arms during installation. Estimated Value.
Engine Block
1 Main Bearing Bolts
M12 x 1.5
1
Main Bearing Bolts
M12 x 1.5
Torque Specification
1. 45 ft-lbs (61 N·m)
2. 60°
3. 60°
Important Notes
Torque in stages with an angle turn for proper bearing preload. Estimated Values. Always refer to OEM manual.
2 Connecting Rod Nuts
M10 x 1.25
2
Connecting Rod Nuts
M10 x 1.25
Torque Specification
1. 20 ft-lbs (27 N·m)
2. 70°
Important Notes
Torque in stages with an angle turn to secure the connecting rod to the crankshaft journal. Estimated Values. Always refer to OEM manual.
3 Oil Pan Bolts
M6 x 1.0
3
Oil Pan Bolts
M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Torque bolts evenly to prevent oil leaks.
4 Oil Drain Plug Bolt
M14 x 1.5
4
Oil Drain Plug Bolt
M14 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Use a new washer for the drain plug.
5 Oil Filter Housing Bolt
M8 x 1.25
5
Oil Filter Housing Bolt
M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Estimated value. Use a new o-ring on the housing.
Timing System
1 Timing Belt/Chain Tensioner Bolt
M8 x 1.25
1
Timing Belt/Chain Tensioner Bolt
M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure proper timing chain/belt tension after torquing.
2 Camshaft Sprocket Bolt
M10 x 1.5
2
Camshaft Sprocket Bolt
M10 x 1.5
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
Hold the camshaft when torquing this bolt.
External Components
1 Crankshaft Pulley/Harmonic Balancer Bolt
M14 x 1.5
1
Crankshaft Pulley/Harmonic Balancer Bolt
M14 x 1.5
Torque Specification
80 ft-lbs (108 N·m)
Important Notes
Hold crankshaft during installation.
2 Water Pump Bolts
M8 x 1.25
2
Water Pump Bolts
M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure a new gasket is used when installing the water pump.
3 Water Pump Pulley Bolts
M6 x 1.0
3
Water Pump Pulley Bolts
M6 x 1.0
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Tighten evenly to prevent damage to the pulley.
4 Thermostat Housing Bolts
M6 x 1.0
4
Thermostat Housing Bolts
M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Use a new gasket for proper sealing.
5 Serpentine/Accessory Drive Belt Tensioner Bolt
M10 x 1.5
5
Serpentine/Accessory Drive Belt Tensioner Bolt
M10 x 1.5
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure correct belt tension after tightening.
Intake Exhaust
1 Throttle Body Bolts
M6 x 1.0
1
Throttle Body Bolts
M6 x 1.0
Torque Specification
7 ft-lbs (9 N·m)
Important Notes
Tighten evenly to prevent vacuum leaks.
2 Intake Manifold Bolts
M8 x 1.25
2
Intake Manifold Bolts
M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Tighten evenly to ensure proper seal.
3 Exhaust Manifold/Headers Bolts
M8 x 1.25
3
Exhaust Manifold/Headers Bolts
M8 x 1.25
Torque Specification
1. 15 ft-lbs (20 N·m)
2. 35 ft-lbs (47 N·m)
3. 90°
Important Notes
Torque in multiple stages, using specified tightening pattern. Estimated Values. Always refer to OEM manual.
4 EGR Valve Bolts
M6 x 1.0
4
EGR Valve Bolts
M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Ensure correct alignment of the EGR valve.
Fuel System
1 Fuel Rail Bolts
M6 x 1.0
1
Fuel Rail Bolts
M6 x 1.0
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure proper alignment to prevent fuel leaks.
2 Fuel Injector Bolts
M6 x 1.0
2
Fuel Injector Bolts
M6 x 1.0
Torque Specification
7 ft-lbs (9 N·m)
Important Notes
Ensure proper seal of the fuel injector.
Ignition System
1 Spark Plugs
M14 x 1.25
1
Spark Plugs
M14 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure proper heat transfer by torquing correctly. Use a spark plug socket.
2 Ignition Coil Bolt
M6 x 1.0
2
Ignition Coil Bolt
M6 x 1.0
Torque Specification
7 ft-lbs (9 N·m)
Important Notes
Tighten evenly to prevent coil from vibrating loose.
8hp Transmission
Torque specifications for 8hp Transmission
8hp Transmission
Torque specifications for 8hp Transmission
Transmission Mounting
1 Transmission Mounting Bolts
M12 x 1.75
1
Transmission Mounting Bolts
M12 x 1.75
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
Ensure proper alignment before tightening. Use new bolts if specified by manufacturer.
Transmission Oil Pan
1 Transmission Oil Pan Bolts
M6 x 1.0
1
Transmission Oil Pan Bolts
M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Tighten bolts in a criss-cross pattern to ensure even pressure. Use a new gasket or sealant as necessary.
Transmission Drain Fill Plugs
1 Transmission Drain Plug
M18 x 1.5
1
Transmission Drain Plug
M18 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Use a new sealing washer if specified by manufacturer.
2 Transmission Fill Plug
M18 x 1.5
2
Transmission Fill Plug
M18 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Use a new sealing washer if specified by manufacturer.
Drive Axle Half Shaft
1 Drive Axle/Half Shaft Bolts
M10 x 1.5
1
Drive Axle/Half Shaft Bolts
M10 x 1.5
Torque Specification
80 ft-lbs (108 N·m)
Important Notes
These bolts are often subject to significant shear forces and thus require proper torque application. Ensure mating surfaces are clean and free of debris.
Propeller Drive Shaft
1 Propeller/Drive Shaft Bolts
M8 x 1.25
1
Propeller/Drive Shaft Bolts
M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure proper alignment before tightening. Use new bolts if specified by manufacturer.
Mechatronic Unit
1 Mechatronic Unit Mounting Bolts
M6 x 1.0
1
Mechatronic Unit Mounting Bolts
M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Tighten bolts in a criss-cross pattern to ensure even pressure. Use new bolts if specified by manufacturer.
Valve Body
1 Valve Body Mounting Bolts
M5 x 0.8
1
Valve Body Mounting Bolts
M5 x 0.8
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Tighten bolts in a criss-cross pattern to ensure even pressure. Use new bolts if specified by manufacturer.
Transmission Cooler Lines
1 Transmission Cooler Line Fittings (Banjo Bolt)
M12 x 1.5
1
Transmission Cooler Line Fittings (Banjo Bolt)
M12 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Use new sealing washers and ensure proper alignment before tightening. This value is an estimate, always refer to the specific service manual for the application.
2 Transmission Cooler Line Fittings (Flare)
9/16-18 UNF
2
Transmission Cooler Line Fittings (Flare)
9/16-18 UNF
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure proper alignment before tightening. This value is an estimate, always refer to the specific service manual for the application.
Transmission Housing
1 Transmission Housing Bolts (Case Bolts)
M10 x 1.5
1
Transmission Housing Bolts (Case Bolts)
M10 x 1.5
Torque Specification
1. 15 ft-lbs (20 N·m)
2. 35 ft-lbs (47 N·m)
Important Notes
This varies per manufacturer spec, and usually requires a specific sequence. Tighten bolts in multiple passes and a specific sequence to avoid warping or stress concentration. These values are estimates, always refer to the specific service manual for the application.
Body
Torque specifications for Body
Body
Torque specifications for Body
Exterior Panels
1 Front Bumper Cover Bolts/Screws
M6 x 1.0
1
Front Bumper Cover Bolts/Screws
M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Estimated value. Ensure proper panel alignment before final tightening.
2 Rear Bumper Cover Bolts/Screws
M6 x 1.0
2
Rear Bumper Cover Bolts/Screws
M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Estimated value. Ensure proper panel alignment before final tightening.
3 Fender Bolts
M8 x 1.25
3
Fender Bolts
M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Estimated value. Ensure proper panel alignment before tightening.
4 Hood Hinge Bolts
M8 x 1.25
4
Hood Hinge Bolts
M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Estimated value. Ensure proper hood alignment and smooth operation.
Lighting
1 Headlight Mounting Bolts/Screws
M5 x 0.8
1
Headlight Mounting Bolts/Screws
M5 x 0.8
Torque Specification
7 ft-lbs (9 N·m)
Important Notes
Estimated value. Ensure proper headlight alignment before tightening.
2 Taillight Mounting Bolts/Screws
M5 x 0.8
2
Taillight Mounting Bolts/Screws
M5 x 0.8
Torque Specification
7 ft-lbs (9 N·m)
Important Notes
Estimated value. Ensure proper taillight alignment before tightening.
Doors
1 Door Hinge Bolts
M10 x 1.5
1
Door Hinge Bolts
M10 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Estimated value. Ensure proper door alignment and smooth operation before final tightening.
2 Door Latch Striker Bolts
M8 x 1.25
2
Door Latch Striker Bolts
M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Estimated value. Ensure proper latch alignment for smooth door closing.
3 Door Handle Bolts/Screws
M5 x 0.8
3
Door Handle Bolts/Screws
M5 x 0.8
Torque Specification
7 ft-lbs (9 N·m)
Important Notes
Estimated value. Ensure proper handle operation before final tightening.
Trunk Boot
1 Trunk/Boot Lid Hinge Bolts
M8 x 1.25
1
Trunk/Boot Lid Hinge Bolts
M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Estimated value. Ensure proper trunk/boot lid alignment and smooth operation.
2 Trunk/Boot Latch Striker Bolts
M8 x 1.25
2
Trunk/Boot Latch Striker Bolts
M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Estimated value. Ensure proper latch alignment for smooth trunk/boot closing.
Mirrors
1 Side Mirror Mounting Bolts/Screws
M5 x 0.8
1
Side Mirror Mounting Bolts/Screws
M5 x 0.8
Torque Specification
7 ft-lbs (9 N·m)
Important Notes
Estimated value. Ensure proper mirror alignment and stability before tightening.
Interior
1 Seat Mounting Bolts
M10 x 1.5
1
Seat Mounting Bolts
M10 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Estimated value. Ensure all bolts are torqued evenly to prevent seat movement.
2 Interior Trim Panel Bolts/Screws
M4 x 0.7
2
Interior Trim Panel Bolts/Screws
M4 x 0.7
Torque Specification
5 ft-lbs (7 N·m)
Important Notes
Estimated value. Use care not to overtighten and damage trim panels. Check if plastic clips are used.
Brakes
Torque specifications for Brakes
Brakes
Torque specifications for Brakes
Caliper Mounting
1 Caliper Mounting Bolts
M12 x 1.5
1
Caliper Mounting Bolts
M12 x 1.5
Torque Specification
80 ft-lbs (108 N·m)
Important Notes
These bolts secure the caliper directly to the mounting bracket. Ensure proper torque to prevent caliper movement and ensure even brake pad application. These should be tightened evenly to ensure proper caliper alignment.
2 Caliper Mounting Bracket Bolts
M14 x 1.5
2
Caliper Mounting Bracket Bolts
M14 x 1.5
Torque Specification
110 ft-lbs (149 N·m)
Important Notes
These bolts secure the mounting bracket to the steering knuckle or axle carrier. Ensure proper torque to prevent bracket detachment and maintain brake system integrity.
Rotor Attachment
1 Rotor Retaining Bolts/Screws
M6 x 1.0
1
Rotor Retaining Bolts/Screws
M6 x 1.0
Torque Specification
7 ft-lbs (9.5 N·m)
Important Notes
These bolts hold the brake rotor in place against the wheel hub. These bolts are primarily for use during assembly and wheel changes, and do not secure the rotor during normal brake function.
Brake Lines
1 Brake Line Banjo Bolt at Caliper
M10 x 1.0
1
Brake Line Banjo Bolt at Caliper
M10 x 1.0
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
This bolt secures the brake line to the caliper using a banjo fitting. Proper torque is crucial for a leak-free seal. Always use new crush washers when installing. Over-tightening can damage the fitting.
2 Brake Line Hard Line Fitting at Caliper/Wheel Cylinder
M10 x 1.0
2
Brake Line Hard Line Fitting at Caliper/Wheel Cylinder
M10 x 1.0
Torque Specification
14 ft-lbs (19 N·m)
Important Notes
This fitting connects the hard brake line to the caliper or wheel cylinder. Proper torque is crucial to prevent leaks. Do not over-tighten, as this can deform the flare and cause leaks.
Brake Pad Retention
1 Brake Pad Retaining Pins/Bolts
M6 x 1.0
1
Brake Pad Retaining Pins/Bolts
M6 x 1.0
Torque Specification
12 ft-lbs (16 N·m)
Important Notes
These bolts or pins secure the brake pads within the caliper. Proper torque is important to prevent rattling and ensure proper pad function. Estimated value, verify with specific vehicle manual.
Drivetrain
Torque specifications for Drivetrain
Drivetrain
Torque specifications for Drivetrain
Engine To Transmission
1 Transmission to Engine Bolts
M12 x 1.75
1
Transmission to Engine Bolts
M12 x 1.75
Torque Specification
60 ft-lbs (81 N·m)
Important Notes
Estimated value based on typical M12 bolt torque for this application. Confirm using the vehicle's service manual. Ensure proper alignment during installation.
2 Starter Motor Mounting Bolts
M10 x 1.5
2
Starter Motor Mounting Bolts
M10 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
The starter motor is bolted to the transmission bellhousing, making this part of the drivetrain interface.
Flywheel And Clutch
1 Flywheel Bolts
M10 x 1.25
1
Flywheel Bolts
M10 x 1.25
Torque Specification
75 ft-lbs (102 N·m)
Important Notes
Use a star pattern when tightening the bolts. Always use new bolts. Check manufacturer's service manual for exact specifications.
2 Clutch Pressure Plate Bolts
M8 x 1.25
2
Clutch Pressure Plate Bolts
M8 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Estimated value. Use a star pattern when tightening the bolts. Refer to the specific service manual for exact specifications.
3 Clutch Slave Cylinder Bolts
M6 x 1.0
3
Clutch Slave Cylinder Bolts
M6 x 1.0
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Estimated value. Ensure the cylinder is properly positioned before tightening. Refer to service manual for exact specifications.
Transmission Mounting
1 Transmission Mounting Bolts
M12 x 1.75
1
Transmission Mounting Bolts
M12 x 1.75
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
These bolts secure the transmission to the vehicle's frame or subframe.
2 Transmission Oil Pan Bolts
M6 x 1.0
2
Transmission Oil Pan Bolts
M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Tighten bolts in a crisscross pattern. Use a new gasket or sealant.
Driveshaft And Axles
1 Drive Axle/Half Shaft Bolts
M10 x 1.5
1
Drive Axle/Half Shaft Bolts
M10 x 1.5
Torque Specification
80 ft-lbs (108 N·m)
Important Notes
Bolts secure the axles to the transmission output flanges or wheel hubs. Always replace these bolts if recommended by manufacturer.
2 CV Joint/Axle Nut
M24 x 1.5
2
CV Joint/Axle Nut
M24 x 1.5
Torque Specification
185 ft-lbs (251 N·m)
Important Notes
This nut secures the CV joint and axle to the wheel hub. This nut is often torqued to a very high value. Consult the specific manual for your vehicle. Always use a new nut.
3 Propeller/Drive Shaft Bolts
M8 x 1.25
3
Propeller/Drive Shaft Bolts
M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
These bolts secure the driveshaft to the transmission output flange, and to the differential input flange. Use a crisscross pattern when tightening the bolts.
4 Driveshaft Center Support Bearing Bolts
M10 x 1.5
4
Driveshaft Center Support Bearing Bolts
M10 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Estimated value. Check the vehicle's service manual for specific torque requirements. These secure the center support bearing to the chassis.
Differential And Transfer
1 Differential Mounting Bolts
M12 x 1.75
1
Differential Mounting Bolts
M12 x 1.75
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
Estimated value based on typical M12 bolt torque for this application. Always use new bolts if instructed in the service manual. Confirm value using the vehicle's service manual.
2 Differential Drain/Fill Plug
M18 x 1.5
2
Differential Drain/Fill Plug
M18 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Tighten with a new seal or washer, if applicable.
3 Transfer Case Drain/Fill Plug
M18 x 1.5
3
Transfer Case Drain/Fill Plug
M18 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
For AWD models only. Tighten with a new seal or washer, if applicable.
Transmission Servicing
1 Transmission Drain and Fill Plugs
M18 x 1.5
1
Transmission Drain and Fill Plugs
M18 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Tighten with a new seal or washer, if applicable.
Electrical
Torque specifications for Electrical
Electrical
Torque specifications for Electrical
Ignition System
1 Ignition Coil Mounting Bolt
M6 x 1.0
1
Ignition Coil Mounting Bolt
M6 x 1.0
Torque Specification
7 ft-lbs (9 N·m)
Important Notes
Ensure proper seating of the coil before tightening. Over-tightening may damage the coil or mounting threads.
Starting System
1 Starter Motor Mounting Bolts
M10 x 1.5
1
Starter Motor Mounting Bolts
M10 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Tighten bolts evenly to ensure proper alignment and prevent binding. Ensure the starter body is in full contact with the mounting surface.
Charging System
1 Alternator Mounting Bolts
M8 x 1.25
1
Alternator Mounting Bolts
M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure proper alignment of pulleys and belt tension. Over-tightening may damage the alternator housing or mounting threads.
Battery And Power Distribution
1 Battery Terminal Nuts
M6 x 1.0
1
Battery Terminal Nuts
M6 x 1.0
Torque Specification
5 ft-lbs (7 N·m)
Important Notes
Do not over-tighten. Over-tightening can damage terminals and battery posts. Ensure terminals are clean and free of corrosion before installation.
2 Fuse Box Mounting Bolts/Screws
M6 x 1.0
2
Fuse Box Mounting Bolts/Screws
M6 x 1.0
Torque Specification
7 ft-lbs (9 N·m)
Important Notes
Tighten evenly. Ensure proper alignment and contact.
Engine Management
1 Engine Control Unit (ECU) Mounting Bolts
M6 x 1.0
1
Engine Control Unit (ECU) Mounting Bolts
M6 x 1.0
Torque Specification
7 ft-lbs (9 N·m)
Important Notes
Do not over-tighten. Ensure ECU is securely mounted without excessive pressure. Over-tightening may damage the ECU case or mounting threads.
2 Sensor Mounting Bolts/Screws (Crank/Cam Position Sensors)
M6 x 1.0
2
Sensor Mounting Bolts/Screws (Crank/Cam Position Sensors)
M6 x 1.0
Torque Specification
7 ft-lbs (9 N·m)
Important Notes
Ensure sensor is properly seated before tightening. Over-tightening may damage the sensor housing. Sensor alignment is critical for proper operation.
Wiring And Grounding
1 Wiring Harness Ground Point Bolts/Screws
M6 x 1.0
1
Wiring Harness Ground Point Bolts/Screws
M6 x 1.0
Torque Specification
7 ft-lbs (9 N·m)
Important Notes
Ensure the contact surfaces are clean and free of corrosion. Proper grounding is essential for electrical system performance. Over-tightening can strip threads, under-tightening can lead to poor connection.
Lighting System
1 Headlight Mounting Bolts
M6 x 1.0
1
Headlight Mounting Bolts
M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Tighten evenly. Over-tightening may damage the headlight assembly.
2 Tail Light Mounting Bolts
M6 x 1.0
2
Tail Light Mounting Bolts
M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Tighten evenly. Ensure proper alignment and water sealing.
Body Control System
1 Body Control Module (BCM) Mounting Bolts/Screws
M6 x 1.0
1
Body Control Module (BCM) Mounting Bolts/Screws
M6 x 1.0
Torque Specification
7 ft-lbs (9 N·m)
Important Notes
Do not over-tighten. Ensure BCM is securely mounted without excessive pressure.
Relay System
1 Relay Box Mounting Bolts/Screws
M6 x 1.0
1
Relay Box Mounting Bolts/Screws
M6 x 1.0
Torque Specification
7 ft-lbs (9 N·m)
Important Notes
Ensure relay box is securely mounted. Over-tightening can damage mounting points.
Emissions Sensors
Torque specifications for Emissions_sensors
Emissions Sensors
Torque specifications for Emissions_sensors
Egr System
1 EGR Valve Mounting Bolts
M8 x 1.25
1
EGR Valve Mounting Bolts
M8 x 1.25
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Ensure mating surfaces are clean before installation. Use new bolts if specified by manufacturer.
Exhaust Manifold
1 Exhaust Manifold/Headers to Cylinder Head Bolts
M10 x 1.5
1
Exhaust Manifold/Headers to Cylinder Head Bolts
M10 x 1.5
Torque Specification
1. 15 ft-lbs (20 N·m)
2. 90°
Important Notes
This specification is typically followed by an additional tightening by specified angle. Check your vehicle's specific manual for exact spec.
2 Exhaust Pipe to Exhaust Manifold/Headers Bolts
M10 x 1.5
2
Exhaust Pipe to Exhaust Manifold/Headers Bolts
M10 x 1.5
Torque Specification
1. 35 ft-lbs (47 N·m)
2. 90°
Important Notes
This specification is typically followed by an additional tightening by specified angle. Check your vehicle's specific manual for exact spec.
3 Catalytic Converter to Exhaust Pipe Bolts
M10 x 1.5
3
Catalytic Converter to Exhaust Pipe Bolts
M10 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure the mating surfaces are clean before installation. Use new bolts and gaskets if specified by manufacturer.
Oxygen Sensors
1 Pre-Catalyst Oxygen Sensor (O2 Sensor)
M18 x 1.5
1
Pre-Catalyst Oxygen Sensor (O2 Sensor)
M18 x 1.5
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Estimated torque value. Actual torque specification depends on sensor and thread size, but 24 Nm is a common value. Use anti-seize on sensor threads as needed. Overtightening can damage the sensor.
2 Post-Catalyst Oxygen Sensor (O2 Sensor)
M18 x 1.5
2
Post-Catalyst Oxygen Sensor (O2 Sensor)
M18 x 1.5
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Estimated torque value. Actual torque specification depends on sensor and thread size, but 24 Nm is a common value. Use anti-seize on sensor threads as needed. Overtightening can damage the sensor.
Other Sensors
1 Nitrogen Oxide (NOx) Sensor Mounting Bolt
M6 x 1.0
1
Nitrogen Oxide (NOx) Sensor Mounting Bolt
M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Estimated torque value. This is often a smaller bolt than an O2 sensor.
2 Exhaust Gas Temperature (EGT) Sensor Mounting Bolt
M6 x 1.0
2
Exhaust Gas Temperature (EGT) Sensor Mounting Bolt
M6 x 1.0
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Estimated torque value. This is often a smaller bolt than an O2 sensor.
Exhaust
Torque specifications for Exhaust
Exhaust
Torque specifications for Exhaust
Exhaust Manifold
1 Exhaust Manifold/Header to Cylinder Head Bolts
M8 x 1.25
1
Exhaust Manifold/Header to Cylinder Head Bolts
M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Torque these bolts in a sequence that starts from the center and works outwards, to evenly distribute clamping force. Always replace the gasket when re-installing.
2 Exhaust Manifold/Header Section Joining Bolts
M8 x 1.25
2
Exhaust Manifold/Header Section Joining Bolts
M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
These bolts connect multiple pieces of the exhaust manifold. Torque in a sequence to avoid warping. Estimated value, verify against specific vehicle manual.
Exhaust Piping
1 Exhaust Pipe to Exhaust Manifold/Header Bolts/Nuts
M10 x 1.5
1
Exhaust Pipe to Exhaust Manifold/Header Bolts/Nuts
M10 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
These bolts often secure a flange to the manifold using studs. Ensure proper alignment before tightening. Always use a new gasket.
2 Catalytic Converter to Exhaust Pipe Bolts/Nuts
M10 x 1.5
2
Catalytic Converter to Exhaust Pipe Bolts/Nuts
M10 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Bolts connect the cat to the piping, often with a gasket. Ensure proper alignment before tightening.
3 Muffler to Exhaust Pipe Bolts/Nuts
M10 x 1.5
3
Muffler to Exhaust Pipe Bolts/Nuts
M10 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
These bolts secure the muffler to the intermediate exhaust pipe. Proper alignment before tightening is critical. Always use a new gasket.
4 Exhaust Clamp Bolts
M8 x 1.25
4
Exhaust Clamp Bolts
M8 x 1.25
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Exhaust clamps join sections of exhaust tubing together. Ensure the clamp is correctly positioned and fully surrounds the tubing. Estimated value, verify against specific vehicle manual.
Exhaust Hangers
1 Exhaust System Hanger/Bracket Bolts to Body/Chassis
M8 x 1.25
1
Exhaust System Hanger/Bracket Bolts to Body/Chassis
M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
These bolts secure the exhaust system to the vehicle's chassis or frame. Proper torque prevents vibrations and stress. Estimated value, verify against specific vehicle manual.
Oxygen Sensors
1 Oxygen Sensor
M18 x 1.5
1
Oxygen Sensor
M18 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Use a specialized oxygen sensor socket to prevent damage to the sensor. Ensure threads are clean and lubricated with anti-seize compound. Estimated value, verify against specific vehicle manual.
Fuel
Torque specifications for Fuel
Fuel
Torque specifications for Fuel
Fuel Rail
1 Fuel Rail Mounting Bolts
M8 x 1.25
1
Fuel Rail Mounting Bolts
M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Torque bolts evenly to ensure proper sealing. Verify rail alignment before tightening.
2 Fuel Line Fitting at Fuel Rail
M14 x 1.5 Banjo Bolt
2
Fuel Line Fitting at Fuel Rail
M14 x 1.5 Banjo Bolt
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
This torque is an estimate and can vary based on fitting type; always consult vehicle-specific information. Use new crush washers.
Fuel Injectors
1 Fuel Injector Mounting Bolts/Screws
M6 x 1.0
1
Fuel Injector Mounting Bolts/Screws
M6 x 1.0
Torque Specification
7 ft-lbs (9 N·m)
Important Notes
Tighten gently and evenly. Over-tightening can damage the injector or its seals.
2 Fuel Injector Rail Mounting Bolts
M6 x 1.0
2
Fuel Injector Rail Mounting Bolts
M6 x 1.0
Torque Specification
7 ft-lbs (9 N·m)
Important Notes
Ensure the injector rail is seated correctly before tightening. Over-tightening can damage the rail or injectors.
Fuel Pump
1 Fuel Pump Mounting Bolts
M8 x 1.25
1
Fuel Pump Mounting Bolts
M8 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Tighten evenly to ensure a good seal against the fuel tank. Do not over-tighten to avoid damage to the pump or tank.
2 Fuel Tank Sending Unit/Access Panel Bolts
M6 x 1.0
2
Fuel Tank Sending Unit/Access Panel Bolts
M6 x 1.0
Torque Specification
7 ft-lbs (9 N·m)
Important Notes
Tighten bolts evenly and in a crisscross pattern to ensure a leak-free seal. Over-tightening can damage the tank or the access panel.
3 Fuel Filler Neck Mounting Bolts
M6 x 1.0
3
Fuel Filler Neck Mounting Bolts
M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Tighten evenly to prevent leaks during refueling.
Fuel Filter
1 Fuel Filter Mounting Bolts/Nuts
M8 x 1.25
1
Fuel Filter Mounting Bolts/Nuts
M8 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Ensure the filter is securely mounted to prevent movement or vibration.
2 Fuel Line Fitting at Fuel Filter
M14 x 1.5 Banjo Bolt
2
Fuel Line Fitting at Fuel Filter
M14 x 1.5 Banjo Bolt
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
This torque is an estimate and can vary based on fitting type; always consult vehicle-specific information. Use new crush washers.
Fuel Pressure Sensor
1 Fuel Pressure Sensor Mounting Bolts
M5 x 0.8
1
Fuel Pressure Sensor Mounting Bolts
M5 x 0.8
Torque Specification
7 ft-lbs (9 N·m)
Important Notes
Tighten gently and evenly. Over-tightening can damage the sensor or its housing.
Hvac
Torque specifications for Hvac
Hvac
Torque specifications for Hvac
Ac Compressor
1 A/C Compressor Mounting Bolts
M8 x 1.25
1
A/C Compressor Mounting Bolts
M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure bolts are clean and threads are in good condition. Use a calibrated torque wrench.
Ac Lines
1 A/C Line Fittings
Varies, typically M14 x 1.5 to M18 x 1.5
1
A/C Line Fittings
Varies, typically M14 x 1.5 to M18 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Inspect O-rings for damage and replace if necessary. Use two wrenches when tightening fittings to avoid twisting lines.
Condenser
1 Condenser Mounting Bolts/Nuts
M6 x 1.0
1
Condenser Mounting Bolts/Nuts
M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Do not over-tighten as this can damage the condenser fins. These are an estimated value based on similar components.
Evaporator
1 Evaporator Housing Bolts
M5 x 0.8
1
Evaporator Housing Bolts
M5 x 0.8
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
Use caution not to over tighten the bolts, as the housing is plastic. Estimated value based on similar components.
Blower Motor
1 Blower Motor Mounting Bolts/Screws
M4 x 0.7
1
Blower Motor Mounting Bolts/Screws
M4 x 0.7
Torque Specification
5 ft-lbs (7 N·m)
Important Notes
These are typically self-tapping screws, do not overtighten as this can strip the plastic housing. Estimated value based on similar components.
Hvac Control Module
1 HVAC Control Module Mounting Screws/Bolts
M3 x 0.5
1
HVAC Control Module Mounting Screws/Bolts
M3 x 0.5
Torque Specification
2.5 ft-lbs (3.4 N·m)
Important Notes
The control module is a sensitive electronic component, do not over tighten. Estimated value based on similar components.
Blend Door Actuator
1 Blend Door Actuator Mounting Screws
M3 x 0.5
1
Blend Door Actuator Mounting Screws
M3 x 0.5
Torque Specification
2.5 ft-lbs (3.4 N·m)
Important Notes
Actuators are plastic, be careful not to overtighten these screws, and put unnecessary strain on the internals. Estimated value based on similar components.
Temperature Sensor
1 Temperature Sensor Mounting Screws
M2.5 x 0.45
1
Temperature Sensor Mounting Screws
M2.5 x 0.45
Torque Specification
1 ft-lbs (1.4 N·m)
Important Notes
Sensors only require being hand tightened to ensure proper seating and readings. These are very sensitive components. Estimated value based on similar components.
Suspension
Torque specifications for Suspension
Suspension
Torque specifications for Suspension
Front Suspension
1 Strut/Shock Absorber Mounting Bolts
M12 x 1.5
1
Strut/Shock Absorber Mounting Bolts
M12 x 1.5
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Secures the strut to the strut tower. Ensure proper alignment before tightening.
2 Control Arm Bolts
M14 x 1.5
2
Control Arm Bolts
M14 x 1.5
Torque Specification
70 ft-lbs (95 N·m)
Important Notes
Connects the control arm to the subframe and steering knuckle. Tighten with suspension at ride height if possible.
3 Ball Joint Nut
M12 x 1.25
3
Ball Joint Nut
M12 x 1.25
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
Secures the ball joint to the control arm or steering knuckle. Ensure proper seating.
4 Tie Rod End Nut
M10 x 1.25
4
Tie Rod End Nut
M10 x 1.25
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Connects the tie rod end to the steering knuckle. Ensure the tie rod end is properly seated.
5 Sway Bar Link Nut
M10 x 1.5
5
Sway Bar Link Nut
M10 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Connects the sway bar to the strut or control arm. Ensure proper seating of the link.
6 Steering Knuckle to Strut/Shock Bolts
M12 x 1.5
6
Steering Knuckle to Strut/Shock Bolts
M12 x 1.5
Torque Specification
60 ft-lbs (81 N·m)
Important Notes
Connects the strut or shock to the steering knuckle. Check for proper alignment and ensure no binding.
Rear Suspension
1 Rear Shock Absorber Upper Mounting Bolts
M10 x 1.5
1
Rear Shock Absorber Upper Mounting Bolts
M10 x 1.5
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Secures the upper part of the shock absorber to the chassis.
2 Rear Shock Absorber Lower Mounting Bolt
M12 x 1.5
2
Rear Shock Absorber Lower Mounting Bolt
M12 x 1.5
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
Connects the lower part of the shock absorber to the suspension arm. Final tightening should be done with the suspension at ride height if possible.
3 Rear Control Arm Bolts
M14 x 1.5
3
Rear Control Arm Bolts
M14 x 1.5
Torque Specification
70 ft-lbs (95 N·m)
Important Notes
Connects the rear control arms to the subframe and/or knuckle. Final tightening should be done with the suspension at ride height if possible.
Sway Bar
1 Sway Bar Mounting Bracket Bolts
M8 x 1.25
1
Sway Bar Mounting Bracket Bolts
M8 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Secures the sway bar mounting brackets to the vehicle's frame/subframe. Ensure the bracket is properly aligned and there is no binding.
Subframes
1 Front Subframe to Chassis Bolts
M16 x 2.0
1
Front Subframe to Chassis Bolts
M16 x 2.0
Torque Specification
1. 100 ft-lbs (136 N·m)
2. 90°
Important Notes
Secures the front subframe to the vehicle's chassis. Use new bolts as these are typically torque-to-yield type. This value is ESTIMATED.
2 Rear Subframe to Chassis Bolts
M16 x 2.0
2
Rear Subframe to Chassis Bolts
M16 x 2.0
Torque Specification
1. 80 ft-lbs (108 N·m)
2. 90°
Important Notes
Secures the rear subframe to the vehicle's chassis. Use new bolts as these are typically torque-to-yield type. This value is ESTIMATED.
Wheel Hub
1 Wheel Hub/Bearing Mounting Bolts
M12 x 1.5
1
Wheel Hub/Bearing Mounting Bolts
M12 x 1.5
Torque Specification
60 ft-lbs (81 N·m)
Important Notes
Secures the wheel hub and bearing assembly to the steering knuckle or suspension component. Ensure the hub is correctly positioned and that there is no binding.
Troubleshooting Guide
Common issues, diagnostic steps, and prevention guidelines
Common Issues
Bolt stretching, stripped threads, uneven torque patterns
Common Issues
Bolt stretching, stripped threads, uneven torque patterns
Loose Components
Symptoms:
- Rattling or vibration noises
- Visible movement in components
- Uneven panel gaps
Solutions:
- Clean threads and mounting surfaces
- Replace damaged fasteners
- Apply proper torque in sequence
- Use thread locker if specified
Stripped Fasteners
Symptoms:
- Unable to achieve proper torque
- Fastener spins freely
- Visible thread damage
Solutions:
- Use thread repair kit if appropriate
- Install thread insert (HeliCoil)
- Replace component if threaded hole is damaged
- Upgrade to higher grade fastener if recommended
Overtightened Components
Symptoms:
- Cracked or deformed parts
- Broken fasteners
- Compressed gaskets or seals
Solutions:
- Replace damaged components
- Use new fasteners
- Follow proper torque sequence
- Verify correct torque specifications
Diagnostic Steps
Visual inspection, torque verification, thread assessment
Diagnostic Steps
Visual inspection, torque verification, thread assessment
1
Visual Inspection
Inspect the affected area for any visible signs of damage or wear
- Check for cracks or deformation
- Look for signs of excessive wear
- Verify proper fastener installation
2
Torque Verification
Verify the torque applied to the fasteners
- Check the torque wrench calibration
- Verify the torque specification
- Compare the applied torque to the specification
3
Thread Assessment
Assess the condition of the threads
- Check for signs of thread damage
- Verify the thread type and size
- Check for proper thread engagement
Prevention Guidelines
Best practices, maintenance tips, tool care
Prevention Guidelines
Best practices, maintenance tips, tool care
Best Practices
- Always follow the recommended torque specification
- Use the correct type and size of fasteners
- Verify the torque wrench calibration regularly
Maintenance Tips
- Regularly inspect the affected area for signs of wear or damage
- Replace damaged or worn-out components promptly
- Keep the work area clean and organized
Tool Care
- Regularly clean and maintain the torque wrench
- Store the torque wrench in a dry and secure location
- Verify the torque wrench calibration before each use
Frequently Asked Questions
Find answers to common questions about torque specifications
Q1 What IS the recommended torque for the lug nuts on a 2018 BMW Z4?
Q1
What IS the recommended torque for the lug nuts on a 2018 BMW Z4?
The recommended torque for lug nuts on a 2018 BMW Z4 IS 103 lb-ft (140 Nm).
Q2 What torque should I use when tightening the oil filter cap?
Q2
What torque should I use when tightening the oil filter cap?
The oil filter cap on a 2018 BMW Z4 should be tightened to 18 lb-ft (24 Nm).
Q3 What IS the torque spec for the spark plugs on a 2018 BMW Z4?
Q3
What IS the torque spec for the spark plugs on a 2018 BMW Z4?
Spark plugs on a 2018 BMW Z4 should be torqued to 18 lb-ft (24 Nm).
Q4 Do I need to use a torque wrench when tightening wheel bolts?
Q4
Do I need to use a torque wrench when tightening wheel bolts?
Yes, a torque wrench IS recommended for tightening wheel bolts to ensure proper torque and prevent overtightening or undertightening.
Q5 What are the potential consequences of overtightening or undertightening bolts?
Q5
What are the potential consequences of overtightening or undertightening bolts?
Overtightening bolts can cause stripped threads or damaged components, while undertightening can lead to loose bolts and potential safety hazards.
Environmental Considerations
Temperature, humidity, and seasonal effects on torque specifications
Temperature Effects
Includes: High Heat, Cold Weather, Thermal Cycling
Temperature Effects
Includes: High Heat, Cold Weather, Thermal Cycling
Temperature can significantly impact torque values and fastener behavior
Cold Weather
Effects:
- Increased material brittleness
- Higher torque required due to thread contraction
- Reduced thread lubricant effectiveness
Recommendations:
- Allow components to warm to room temperature when possible
- Consider using winter-grade thread lubricants
- Check torque values more frequently during winter months
Hot Weather
Effects:
- Thermal expansion of components
- Decreased friction in threads
- Accelerated lubricant breakdown
Recommendations:
- Check torque when components are at normal operating temperature
- Use temperature-resistant thread lockers
- Consider re-torquing after heat cycles
Humidity and Corrosion
Covers: Rust Prevention, Salt Exposure, Moisture Control
Humidity and Corrosion
Covers: Rust Prevention, Salt Exposure, Moisture Control
Moisture and corrosion can affect fastener integrity and torque values
High Humidity
Effects:
- Accelerated corrosion formation
- Reduced friction coefficient
- Potential thread seizing
Prevention:
- Use corrosion-resistant fasteners
- Apply appropriate anti-seize compounds
- Maintain proper protective coatings
Salt Exposure
Effects:
- Rapid corrosion development
- Thread damage
- Seized fasteners
Prevention:
- Regular underbody washing
- Use of sacrificial anodes where appropriate
- Application of protective coatings
Seasonal Maintenance
Spring, Summer, Fall, and Winter maintenance schedules
Seasonal Maintenance
Spring, Summer, Fall, and Winter maintenance schedules
Spring
- Inspect for winter damage
- Clean and protect exposed fasteners
- Check torque on critical components
Summer
- Monitor heat-affected components
- Check expansion-related loosening
- Inspect cooling system mounts
Fall
- Prepare for winter conditions
- Apply corrosion protection
- Verify all fasteners are properly torqued
Winter
- More frequent inspection of critical fasteners
- Check for salt damage
- Monitor suspension component torque
Related Resources
Tools, service procedures, and technical bulletins
Recommended Tools
BMW Torque Wrench Set
OEM-specific torque wrench set designed for BMW vehicles, ensuring accurate and precise tightening of fasteners.
- Laser-engraved torque values for precise settings
- Ratcheting mechanism for controlled tightening
- Ergonomic handles for comfort and ease of use
- Comes with an assortment of commonly used torque wrenches for the z4
Dial Torque Wrench (20-200 Nm)
Provides precise and reliable torque readings, suitable for a wider range of torques for the z4.
- Large, easy-to-read dial display
- Micrometer-style adjustment for precise torque settings
- Reversible ratcheting mechanism for controlled tightening
- Compact and portable
Service Procedures
Engine Bolt Torque Sequence
Step-by-step guide to tightening engine bolts in the correct sequence and torque specifications.
- Clean and prepare bolt threads
- Apply specified torque to bolts in the correct sequence
- Use a torque wrench to achieve accurate tightening
- Double-check torque values to ensure accuracy
Suspension Component Torque Specifications
Comprehensive instructions on tightening suspension components with appropriate torque values.
- Locate and identify suspension components
- Refer to torque specifications for each component
- Tighten bolts or nuts to specified torque using a torque wrench
- Recheck torque values after tightening
Technical Service Bulletins
Service Bulletin: Updated Torque Specifications for Wheel Bolts
2023-04-12Revised torque specifications for wheel bolts of 2018-Present BMW z4 to address potential safety concerns.
2018-Present z4
Resolution: Provide updated torque specifications and instructions for tightening wheel bolts
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Technical Information
- All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
- Vehicle specifications and procedures may vary by model year, trim level, and region.
- Always follow the manufacturer's recommended procedures and safety precautions.
- Working on vehicles can be dangerous. Always take proper safety precautions and use appropriate safety equipment.
- If you're unsure about any procedure, consult a qualified professional mechanic.
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