BMW Vehicle Models 550i 2017-present
BMW Vehicle Models 550i 2017-present Torque Specifications
Complete BMW Vehicle Models 550i 2017-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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4.4l Engine
Torque specifications for 4.4L Engine
4.4l Engine
Torque specifications for 4.4L Engine
Cylinder Head
1 Cylinder Head Bolts
M12 x 1.5
1
Cylinder Head Bolts
M12 x 1.5
Torque Specification
1. 18 ft-lbs (24 N·m)
2. 90°
Important Notes
Initial torque followed by an angle torque. Always consult OEM repair manual for specific torque sequence and angle values.
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
Tighten in a criss-cross pattern to ensure even pressure.
3 Cylinder Head Cover Bolts
M6 x 1.0
3
Cylinder Head Cover Bolts
M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Tighten in a specific pattern, consult OEM repair manual, to ensure proper sealing. These are usually specific cover bolts, not valve cover bolts.
4 Rocker Arms/Shafts Bolts
M8 x 1.25
4
Rocker Arms/Shafts Bolts
M8 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Tighten evenly to ensure proper valve operation. Consult repair manual.
5 Camshaft Sprocket Bolts
M10 x 1.25
5
Camshaft Sprocket Bolts
M10 x 1.25
Torque Specification
60 ft-lbs (81 N·m)
Important Notes
Proper camshaft timing is critical. Ensure correct alignment before tightening.
6 Camshaft Position Sensor Bolts
M6 x 1.0
6
Camshaft Position Sensor Bolts
M6 x 1.0
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
Do not overtighten, sensor can be damaged, use inch-pounds torque wrench for accuracy.
Engine Block
1 Main Bearing Bolts
M12 x 1.5
1
Main Bearing Bolts
M12 x 1.5
Torque Specification
1. 40 ft-lbs (54 N·m)
2. 70°
Important Notes
Initial torque followed by an angle torque. Always consult OEM repair manual for specific torque sequence and angle values.
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. 60°
Important Notes
Initial torque followed by an angle torque. Always consult OEM repair manual for specific torque sequence and angle values.
3 Oil Pan Bolts
M6 x 1.0
3
Oil Pan Bolts
M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Tighten evenly in a criss-cross pattern to prevent 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 new crush washer each time to prevent leaks.
5 Oil Pump Mounting Bolts
M8 x 1.25
5
Oil Pump Mounting Bolts
M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Tighten evenly, ensure proper alignment of oil pump.
6 Crankshaft Position Sensor Bolts
M6 x 1.0
6
Crankshaft Position Sensor Bolts
M6 x 1.0
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
Do not overtighten, sensor can be damaged, use inch-pounds torque wrench for accuracy.
Front Engine
1 Timing Belt/Chain Tensioner Bolt
M8 x 1.25
1
Timing Belt/Chain Tensioner Bolt
M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure proper tensioner alignment before torquing. Consult repair manual for proper procedures.
2 Crankshaft Pulley/Harmonic Balancer Bolt
M14 x 1.5
2
Crankshaft Pulley/Harmonic Balancer Bolt
M14 x 1.5
Torque Specification
1. 90 ft-lbs (122 N·m)
2. 90°
Important Notes
Initial torque followed by an angle torque. Always consult OEM repair manual for specific angle value.
3 Timing Cover Bolts
M6 x 1.0
3
Timing Cover Bolts
M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Tighten evenly to ensure a proper seal and prevent oil leaks. Consult OEM for specific patterns
4 Serpentine/Accessory Drive Belt Tensioner Bolt
M8 x 1.25
4
Serpentine/Accessory Drive Belt Tensioner Bolt
M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure proper tensioner alignment before tightening. Consult manual
5 Drive Belt Idler Pulley Bolt
M8 x 1.25
5
Drive Belt Idler Pulley Bolt
M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure pulley is properly aligned before tightening. Consult manual
6 Water Pump Bolts
M6 x 1.0
6
Water Pump Bolts
M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Tighten bolts evenly to prevent leaks. Use a new gasket.
7 Water Pump Pulley Bolts
M6 x 1.0
7
Water Pump Pulley Bolts
M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Tighten evenly.
Intake System
1 Intake Manifold Bolts
M8 x 1.25
1
Intake Manifold Bolts
M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Tighten bolts in a specified sequence to ensure a leak-free seal, consult OEM repair manual for pattern.
2 Throttle Body Bolts
M6 x 1.0
2
Throttle Body Bolts
M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Tighten evenly to prevent air leaks. New gasket recommended
3 EGR Valve Bolts
M6 x 1.0
3
EGR Valve Bolts
M6 x 1.0
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Tighten evenly to ensure a proper seal. New gasket is recommended.
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
Tighten evenly, new gasket recommended to avoid leaks.
Exhaust System
1 Exhaust Manifold/Headers Bolts
M8 x 1.25
1
Exhaust Manifold/Headers Bolts
M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Tighten in a specified sequence (consult repair manual) to avoid leaks. New gasket is required.
Fuel System
1 Fuel Rail Bolts
M6 x 1.0
1
Fuel Rail Bolts
M6 x 1.0
Torque Specification
16 ft-lbs (22 N·m)
Important Notes
Tighten evenly to prevent fuel leaks.
2 Fuel Injector Bolts
M6 x 1.0
2
Fuel Injector Bolts
M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Tighten carefully to avoid damaging injectors. Consult repair manual.
3 Fuel Injector Rail Bolts
M6 x 1.0
3
Fuel Injector Rail Bolts
M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Tighten evenly to ensure a fuel-tight seal.
Electrical System
1 Ignition Coil Bolt
M6 x 1.0
1
Ignition Coil Bolt
M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Do not overtighten to avoid damage to coil and surrounding components, use inch-pounds torque wrench.
2 Engine Coolant Temperature Sensor Bolt
M6 x 1.0
2
Engine Coolant Temperature Sensor Bolt
M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Do not overtighten. Ensure proper sealing, new o-ring if applicable. Estimated value.
3 VANOS Solenoid Bolts
M6 x 1.0
3
VANOS Solenoid Bolts
M6 x 1.0
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
Do not overtighten as this could damage the solenoid.
Cooling System
1 Oil Cooler Mounting Bolts
M8 x 1.25
1
Oil Cooler Mounting Bolts
M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Tighten evenly to ensure a proper seal. New gasket recommended.
Other
1 Oil Filter Housing Bolt
M8 x 1.25
1
Oil Filter Housing Bolt
M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Tighten evenly, use new o-ring.
2 Flywheel Bolts
M12 x 1.5
2
Flywheel Bolts
M12 x 1.5
Torque Specification
70 ft-lbs (95 N·m)
Important Notes
Use new bolts. Tighten in a star pattern.
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
35 ft-lbs (47 N·m)
Important Notes
Ensure proper alignment of transmission before torquing. May have multiple bolts, torque in a crisscross pattern.
Transmission Oil Pan
1 Transmission Oil Pan Bolts
M6 x 1.0
1
Transmission Oil Pan Bolts
M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Use new bolts upon reassembly, as they often have a micro-encapsulated sealant. Torque in a crisscross pattern.
Drain And Fill Plugs
1 Transmission Drain Plug
M18 x 1.5
1
Transmission Drain Plug
M18 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Replace crush washer each time. Do not overtighten.
2 Transmission Fill Plug
M18 x 1.5
2
Transmission Fill Plug
M18 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Replace crush washer each time. Do not overtighten.
Mechatronic Unit
1 Mechatronic Unit Bolts
M6 x 1.0
1
Mechatronic Unit Bolts
M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Smaller bolts requiring lower torque. Use a calibrated torque wrench. Torque in a crisscross pattern.
Valve Body
1 Transmission Valve Body Bolts
M6 x 1.0
1
Transmission Valve Body Bolts
M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Torque in specific sequence according to the repair manual to prevent distortion and leaks. Use a calibrated torque wrench.
Bell Housing
1 Bell Housing Bolts (Grade 10.9)
M12 x 1.75
1
Bell Housing Bolts (Grade 10.9)
M12 x 1.75
Torque Specification
33 ft-lbs (45 N·m)
Important Notes
Verify bolt grade. Torque in a crisscross pattern. Replace any TTY bolts. Clean threads and bolt heads prior to install.
2 Bell Housing Bolts (Grade 12.9)
M12 x 1.75
2
Bell Housing Bolts (Grade 12.9)
M12 x 1.75
Torque Specification
55 ft-lbs (75 N·m)
Important Notes
Verify bolt grade. Torque in a crisscross pattern. Replace any TTY bolts. Clean threads and bolt heads prior to install.
Torque Converter
1 Torque Converter Bolts
M10 x 1.5
1
Torque Converter Bolts
M10 x 1.5
Torque Specification
48 ft-lbs (65 N·m)
Important Notes
Replace bolts each time, usually TTY bolts. Torque in a star pattern.
Output Flange
1 Output Flange Nut
M24 x 1.5
1
Output Flange Nut
M24 x 1.5
Torque Specification
148 ft-lbs (200 N·m)
Important Notes
Use a new lock nut each time. High torque value, ensure proper seating.
Coolant Lines
1 Coolant Line Bolts
M6 x 1.0
1
Coolant Line Bolts
M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Ensure o-rings are in good condition. Do not over tighten.
Body
Torque specifications for Body
Body
Torque specifications for Body
Fuel System
1 Fuel Tank Strap Bolts
M10 x 1.5
1
Fuel Tank Strap Bolts
M10 x 1.5
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure straps are properly positioned before tightening. Check for proper alignment of the fuel tank after installation.
2 Fuel Filler Neck Bolts
M6 x 1.0
2
Fuel Filler Neck Bolts
M6 x 1.0
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure the filler neck gasket is correctly placed. Do not overtighten to avoid damaging the filler neck or creating leaks.
Wheel System
1 Wheel Lug Nuts
M14 x 1.25
1
Wheel Lug Nuts
M14 x 1.25
Torque Specification
90 ft-lbs (122 N·m)
Important Notes
Tighten lug nuts in a star pattern. Ensure the wheel is properly seated against the hub before tightening. Re-torque after 50-100 miles of driving.
Door System
1 Door Hinge Bolts (Body Side)
M10 x 1.5
1
Door Hinge Bolts (Body Side)
M10 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Ensure proper door alignment before tightening. Overtightening can damage the hinges and misalign the door.
2 Hood Hinge Bolts (Body Side)
M8 x 1.25
2
Hood Hinge Bolts (Body Side)
M8 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Ensure proper hood alignment before tightening. Check for smooth hood operation after installation.
Body Panels
1 Fender Mounting Bolts
M8 x 1.25
1
Fender Mounting Bolts
M8 x 1.25
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Ensure proper fender alignment before tightening. Do not overtighten as fenders are thin and can be easily damaged.
2 Bumper Cover Mounting Bolts/Screws
M6 x 1.0
2
Bumper Cover Mounting Bolts/Screws
M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure bumper cover is flush and aligned with surrounding panels. Do not overtighten as the bumper cover is plastic and may crack.
Lighting System
1 Headlight Mounting Bolts/Screws
M6 x 1.0
1
Headlight Mounting Bolts/Screws
M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure headlight alignment is correct before tightening. Overtightening can damage the headlight housing.
2 Taillight Mounting Bolts/Screws
M6 x 1.0
2
Taillight Mounting Bolts/Screws
M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure taillight is properly aligned with the body. Do not overtighten, as this can damage the housing.
Seating System
1 Seat Mounting Bolts
M10 x 1.5
1
Seat Mounting Bolts
M10 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Ensure seats are properly positioned before tightening. Proper torque is critical for occupant safety.
2 Seat Belt Mounting Bolts
M10 x 1.5
2
Seat Belt Mounting Bolts
M10 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Verify that the seat belt is correctly aligned and functional after installation. These are critical safety components so proper torque is essential.
Electrical System
1 Body Control Module (BCM) Mounting Bolts/Screws
M5 x 0.8
1
Body Control Module (BCM) Mounting Bolts/Screws
M5 x 0.8
Torque Specification
5 ft-lbs (7 N·m)
Important Notes
Ensure the BCM is properly positioned and the wiring harness is correctly connected. Overtightening can damage the module.
Brakes
Torque specifications for Brakes
Brakes
Torque specifications for Brakes
Caliper Mounting
1 Brake Caliper Bolts
M14 x 1.5
1
Brake Caliper Bolts
M14 x 1.5
Torque Specification
80 ft-lbs (108 N·m)
Important Notes
Secures the brake caliper directly to the mounting bracket. Ensure proper thread engagement before tightening. Use a cross-tightening pattern where applicable.
2 Brake Caliper Mounting Bracket Bolts
M14 x 1.5
2
Brake Caliper Mounting Bracket Bolts
M14 x 1.5
Torque Specification
130 ft-lbs (176 N·m)
Important Notes
Attaches the caliper mounting bracket to the steering knuckle/axle carrier. Crucial for overall brake assembly integrity. Ensure proper seating of the bracket against the mounting surface.
Caliper Components
1 Brake Caliper Guide Pin Bolts
M10 x 1.25
1
Brake Caliper Guide Pin Bolts
M10 x 1.25
Torque Specification
28 ft-lbs (38 N·m)
Important Notes
Secures the caliper guide pins. These allow the caliper to float. Over-tightening can cause binding, under-tightening can cause rattling. Estimated value, check service manual.
2 Brake Line Fitting at Caliper
M10 x 1.0 (flare fitting)
2
Brake Line Fitting at Caliper
M10 x 1.0 (flare fitting)
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Connects the brake line to the caliper. Use a flare nut wrench to avoid damage to the fitting. Over-tightening can damage the flare nut and lead to leaks.
Rotor Mounting
1 Brake Disc Retaining Bolts
M8 x 1.25
1
Brake Disc Retaining Bolts
M8 x 1.25
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Secures the brake disc to the wheel hub. These are generally low-torque bolts. Ensure the disc sits flush against the hub flange before tightening.
Brake Lines
1 Brake Line Mounting Bracket Bolts
M6 x 1.0
1
Brake Line Mounting Bracket Bolts
M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Secures brake line mounting brackets to the chassis or suspension. Ensure lines are secured without rubbing or excessive stress. Estimated value, check service manual.
Sensor Mounting
1 Brake Pad Wear Sensor Mounting Screw
M4 x 0.7
1
Brake Pad Wear Sensor Mounting Screw
M4 x 0.7
Torque Specification
7 ft-lbs (9 N·m)
Important Notes
Secures the brake pad wear sensor. Overtightening can damage the sensor. Estimated value, check service manual.
Master Cylinder
1 Brake Booster/Master Cylinder Mounting Bolts
M8 x 1.25
1
Brake Booster/Master Cylinder Mounting Bolts
M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Secures the brake booster and master cylinder to the firewall. Crucial for proper braking performance. Ensure proper seating against firewall
Drivetrain
Torque specifications for Drivetrain
Drivetrain
Torque specifications for Drivetrain
Engine Flywheel
1 Flywheel Bolts
M12 x 1.5
1
Flywheel Bolts
M12 x 1.5
Torque Specification
70 ft-lbs (95 N·m)
Important Notes
Apply thread locker. Ensure surfaces are clean and free from debris before installation.
Transmission Mounting
1 Transmission Mounting Bolts
M12 x 1.75
1
Transmission Mounting Bolts
M12 x 1.75
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Ensure proper alignment of transmission before tightening.
Transmission Components
1 Transmission Oil Pan Bolts
M8 x 1.25
1
Transmission Oil Pan Bolts
M8 x 1.25
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Use a new gasket. Tighten in a cross pattern to ensure even sealing.
2 Transmission Drain and Fill Plugs
M18 x 1.5
2
Transmission Drain and Fill Plugs
M18 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Use a new crush washer or o-ring. Do not over-tighten.
Driveshaft
1 Propeller/Drive Shaft Bolts
M10 x 1.5
1
Propeller/Drive Shaft Bolts
M10 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Apply thread locker. Ensure correct alignment of the drive shaft.
2 Flex Disc (Guibo) Bolts
M10 x 1.5
2
Flex Disc (Guibo) Bolts
M10 x 1.5
Torque Specification
1. 52 ft-lbs (70 N·m)
2. 90°
Important Notes
Replace the bolts if previously used. Tighten to torque spec first, then complete angle spec. Ensure correct Guibo orientation.
3 Center Support Bearing Bolts
M8 x 1.25
3
Center Support Bearing Bolts
M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure correct alignment of the bearing and driveshaft. Do not overtighten
4 Driveshaft CV Joint Bolts
M10 x 1.5
4
Driveshaft CV Joint Bolts
M10 x 1.5
Torque Specification
52 ft-lbs (70 N·m)
Important Notes
Ensure proper alignment of the CV joint.
Axles
1 Drive Axle/Half Shaft Bolts
M12 x 1.5
1
Drive Axle/Half Shaft Bolts
M12 x 1.5
Torque Specification
90 ft-lbs (122 N·m)
Important Notes
Use thread locker. Ensure proper seating of the axle into the flanges.
2 CV Joint/Axle Nut
M24 x 1.5
2
CV Joint/Axle Nut
M24 x 1.5
Torque Specification
180 ft-lbs (244 N·m)
Important Notes
Use new axle nut. Torque nut after the vehicle has been lowered onto it's wheels.
Differential
1 Differential Mounting Bolts
M12 x 1.75
1
Differential Mounting Bolts
M12 x 1.75
Torque Specification
60 ft-lbs (81 N·m)
Important Notes
Ensure proper alignment of the differential during installation.
2 Differential Drain/Fill Plug
M18 x 1.5
2
Differential Drain/Fill Plug
M18 x 1.5
Torque Specification
45 ft-lbs (61 N·m)
Important Notes
Use a new crush washer or o-ring. Do not overtighten.
Transfer Case
1 Transfer Case Drain/Fill Plug
M18 x 1.5
1
Transfer Case Drain/Fill Plug
M18 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Use a new crush washer or o-ring. Do not overtighten.
Wheel Bearing Hub
1 Wheel Bearing Retaining Bolts
M12 x 1.5
1
Wheel Bearing Retaining Bolts
M12 x 1.5
Torque Specification
74 ft-lbs (100 N·m)
Important Notes
Ensure the wheel bearing is properly seated. Tighten bolts in a cross pattern.
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
7.4 ft-lbs (10 N·m)
Important Notes
Ensure the coil is seated properly before tightening. Do not overtighten as the coil housing may crack. Estimated bolt size.
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 (41 N·m)
Important Notes
Ensure the starter is properly aligned with the flywheel before tightening. Use a cross-tightening pattern if there are multiple bolts.
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
Verify correct alternator alignment before tightening. Estimated bolt size and thread pitch.
Battery Connections
1 Battery Terminal Nuts
M6 x 1.0
1
Battery Terminal Nuts
M6 x 1.0
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
Do not overtighten; excessive force can damage the battery posts. Clean the battery terminal and connection before assembling. Estimated bolt size.
Engine Control Unit
1 ECU Mounting Bolts/Nuts
M6 x 1.0
1
ECU Mounting Bolts/Nuts
M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Ensure the ECU is properly aligned and seated before tightening. Estimated bolt size.
Sensor Mounting
1 Sensor Mounting Bolts/Screws (Various)
M5 x 0.8
1
Sensor Mounting Bolts/Screws (Various)
M5 x 0.8
Torque Specification
7 ft-lbs (9.5 N·m)
Important Notes
Be careful not to overtighten as sensor housings can be brittle. Value is an estimate based on typical sensor bolt sizes. Always refer to manufacturer documentation.
Ground Connections
1 Ground Strap/Wire Bolt Connections
M6 x 1.0
1
Ground Strap/Wire Bolt Connections
M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Ensure the contact surfaces are clean and free of corrosion. Estimated bolt size.
Wiring Harness
1 Wiring Harness Connector Bolts/Screws
M4 x 0.7
1
Wiring Harness Connector Bolts/Screws
M4 x 0.7
Torque Specification
1.5 ft-lbs (2 N·m)
Important Notes
Be very careful not to overtighten plastic connector housings. Estimated bolt size. Always refer to manufacturer documentation if available.
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
15 ft-lbs (20 N·m)
Important Notes
Ensure mating surfaces are clean. Use a calibrated torque wrench for proper tightening.
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
18 ft-lbs (24 N·m)
Important Notes
Use a criss-cross pattern when tightening these bolts. Ensure gaskets are in good condition to prevent exhaust leaks.
2 Exhaust Manifold/Header to Downpipe Bolts
M10 x 1.5
2
Exhaust Manifold/Header to Downpipe Bolts
M10 x 1.5
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure correct alignment of the exhaust components. Proper torque is critical to avoid leaks.
Catalytic Converter
1 Catalytic Converter to Exhaust Pipe Bolts
M10 x 1.5
1
Catalytic Converter to Exhaust Pipe Bolts
M10 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure proper alignment and use new gaskets if necessary.
Oxygen Sensors
1 Oxygen Sensor (Threaded Type)
M18 x 1.5
1
Oxygen Sensor (Threaded Type)
M18 x 1.5
Torque Specification
33 ft-lbs (45 N·m)
Important Notes
Apply anti-seize compound to the threads. Do not overtighten as this can damage the sensor or threads. This is an estimated value. Verify for your specific sensor.
2 Oxygen Sensor (Stud Type)
M8 x 1.25 (stud)
2
Oxygen Sensor (Stud Type)
M8 x 1.25 (stud)
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Tighten the sensor down hand tight first, then add a quarter turn with a wrench.
Nox Sensors
1 Nitrogen Oxide (NOx) Sensor Mounting Bolts
M6 x 1.0
1
Nitrogen Oxide (NOx) Sensor Mounting Bolts
M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Use a calibrated torque wrench and ensure the mating surface is clean. Be careful to not crush sensor housing, it is very delicate.
Exhaust Gas Temp Sensors
1 Exhaust Gas Temperature (EGT) Sensor Mounting Bolts
M6 x 1.0
1
Exhaust Gas Temperature (EGT) Sensor Mounting Bolts
M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Use a calibrated torque wrench and ensure the mating surface is clean. Be careful to not crush the sensor housing.
Exhaust
Torque specifications for Exhaust
Exhaust
Torque specifications for Exhaust
Exhaust Manifold
1 Exhaust Manifold to Cylinder Head Bolts
M8 x 1.25
1
Exhaust Manifold to Cylinder Head Bolts
M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Tighten bolts in a crisscross pattern. Ensure gasket is properly aligned before tightening. Final torque should be applied in a smooth, continuous motion.
Exhaust Piping
1 Exhaust Pipe to Exhaust Manifold/Headers Bolts
M10 x 1.5
1
Exhaust Pipe to Exhaust Manifold/Headers Bolts
M10 x 1.5
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure the flange surfaces are clean and free of debris. Use new gasket where applicable. Final torque should be applied evenly.
2 Catalytic Converter to Exhaust Pipe Bolts
M10 x 1.5
2
Catalytic Converter to Exhaust Pipe Bolts
M10 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure proper alignment between the catalytic converter and the exhaust pipe. Use new gasket where applicable. Tighten bolts evenly.
3 Exhaust Pipe Flange Bolts (between exhaust pipes)
M10 x 1.5
3
Exhaust Pipe Flange Bolts (between exhaust pipes)
M10 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure flange surfaces are clean and free of debris. Use new gasket where applicable. Tighten bolts evenly.
4 Muffler to Exhaust Pipe Bolts
M10 x 1.5
4
Muffler to Exhaust Pipe Bolts
M10 x 1.5
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Check for proper alignment of muffler and exhaust pipe. Use new gasket if required. Tighten evenly to avoid misalignment.
Exhaust Mounting
1 Exhaust System Hanger/Bracket Bolts
M8 x 1.25
1
Exhaust System Hanger/Bracket Bolts
M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure rubber mounts are in good condition. Tighten bolts to specified torque. This value is an estimate; verify with your vehicle's service manual.
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
Apply anti-seize compound to the sensor threads. Ensure proper seating of the sensor.
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
16 ft-lbs (22 N·m)
Important Notes
Tighten bolts to specified torque. Ensure fuel rail is properly seated against the manifold before tightening.
2 Fuel Injector Mounting Bolts
M6 x 1.0
2
Fuel Injector Mounting Bolts
M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Ensure injectors are properly seated in the fuel rail and intake manifold before tightening. Do not overtighten.
3 Fuel Injector Rail Mounting Bolts
M6 x 1.0
3
Fuel Injector Rail Mounting Bolts
M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Tighten bolts evenly and do not over-tighten. Ensure proper seating of the rail and injector.
4 Fuel Pressure Sensor Bolt
M5 x 0.8
4
Fuel Pressure Sensor Bolt
M5 x 0.8
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Do not overtighten. The fuel pressure sensor is a delicate part, and proper torque is critical for proper function and sealing.
5 Fuel Line Banjo Bolts (Fuel Rail Connections)
M12 x 1.5
5
Fuel Line Banjo Bolts (Fuel Rail Connections)
M12 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Always use new crush washers for banjo fittings. Torque may vary depending on bolt and material; use these values for standard fuel rail connections with common materials. Consult vehicle specific service manual to verify.
Fuel Pump
1 Fuel Pump Mounting Bolts
M8 x 1.25
1
Fuel Pump Mounting Bolts
M8 x 1.25
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Ensure the fuel pump assembly is properly aligned before tightening. Even torque is critical to prevent leaks.
2 Fuel Tank Strap Bolts
M10 x 1.5
2
Fuel Tank Strap Bolts
M10 x 1.5
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure even tightening of strap bolts to properly secure the fuel tank. Avoid over-tightening, which could damage the tank.
3 Fuel Tank Access Panel Bolts
M6 x 1.0
3
Fuel Tank Access Panel Bolts
M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Do not over-tighten. Ensure proper sealing and alignment.
Fuel Lines
1 Fuel Filter Housing Mounting Bolt/Nut
M8 x 1.25
1
Fuel Filter Housing Mounting Bolt/Nut
M8 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Tighten bolts/nuts to specified torque. Ensure housing is properly seated.
2 Fuel Line Banjo Bolts (Various Locations)
M10 x 1.25
2
Fuel Line Banjo Bolts (Various Locations)
M10 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Use new crush washers. Torque values may vary by size and material, consult a service manual. Value provided is an estimate for standard banjo fittings on fuel lines.
Fuel Misc
1 Fuel Filler Neck Bolts
M6 x 1.0
1
Fuel Filler Neck Bolts
M6 x 1.0
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Tighten bolts evenly to ensure proper seal.
2 Fuel Vapor Canister Mounting Bolts
M6 x 1.0
2
Fuel Vapor Canister Mounting Bolts
M6 x 1.0
Torque Specification
7 ft-lbs (9 N·m)
Important Notes
Do not over-tighten; ensure canister is securely mounted without crushing the canister.
High Pressure Fuel Pump
1 High-Pressure Fuel Pump Mounting Bolts
M8 x 1.25
1
High-Pressure Fuel Pump Mounting Bolts
M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure the pump is correctly positioned against the engine block before tightening. Torque to spec to prevent leaks and improper pump function. This value is an estimate based on similar engine component bolts, consult vehicle-specific manual to verify.
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 tightened evenly. Inspect for any damaged threads. Use new bolts and washers if needed.
Ac Lines
1 A/C Line Fittings
Varies, typically M6 or M8
1
A/C Line Fittings
Varies, typically M6 or M8
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Use new o-rings or sealing washers when reassembling fittings to prevent leaks. Do not over-tighten as it will damage the sealing surface.
Ac Condenser
1 A/C Condenser Mounting Bolts/Nuts
M6 x 1.0
1
A/C Condenser Mounting Bolts/Nuts
M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Estimated value. Ensure the condenser is properly aligned to prevent damage. These bolts often thread into plastic or soft metal components.
Ac Evaporator
1 A/C Evaporator Housing Bolts
M5 x 0.8
1
A/C Evaporator Housing Bolts
M5 x 0.8
Torque Specification
7 ft-lbs (9.5 N·m)
Important Notes
Estimated value. These bolts often thread into plastic components. Do not over-tighten.
Blend Door Actuator
1 HVAC Blend Door Actuator Mounting Screws
M4 x 0.7
1
HVAC Blend Door Actuator Mounting Screws
M4 x 0.7
Torque Specification
0.4 ft-lbs (0.55 N·m)
Important Notes
Estimated value. These screws are very small, and must not be over torqued. Torque specified in inch-lbs (in-lbs) converted to ft-lbs. Use extreme caution.
Blower Motor
1 Blower Motor Mounting Screws
M5 x 0.8
1
Blower Motor Mounting Screws
M5 x 0.8
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
Estimated value. Do not over-tighten as this will often thread into plastic.
Expansion Valve
1 Expansion Valve Mounting Bolts
M6 x 1.0
1
Expansion Valve Mounting Bolts
M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Estimated value. Ensure proper sealing washers are installed to prevent leaks. Do not over-tighten.
Suspension
Torque specifications for Suspension
Suspension
Torque specifications for Suspension
Front Struts
1 Strut Lower Mounting Bolts
M14 x 1.5
1
Strut Lower Mounting Bolts
M14 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
These bolts secure the strut to the steering knuckle. Ensure proper alignment before tightening.
2 Strut Top Mount Nuts
M8 x 1.25
2
Strut Top Mount Nuts
M8 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
These nuts secure the top of the strut to the vehicle's body. Torque evenly.
Front Control Arms
1 Control Arm to Chassis Bolts
M14 x 1.5
1
Control Arm to Chassis Bolts
M14 x 1.5
Torque Specification
70 ft-lbs (95 N·m)
Important Notes
These bolts secure the control arm to the vehicle's frame. Tighten with the vehicle at ride height if specified by the manufacturer.
2 Control Arm to Steering Knuckle Bolt
M12 x 1.5
2
Control Arm to Steering Knuckle Bolt
M12 x 1.5
Torque Specification
70 ft-lbs (95 N·m)
Important Notes
This bolt secures the control arm to the steering knuckle. Ensure proper alignment before tightening.
3 Ball Joint Nut
M12 x 1.25
3
Ball Joint Nut
M12 x 1.25
Torque Specification
55 ft-lbs (75 N·m)
Important Notes
This nut secures the ball joint to the control arm or steering knuckle. Ensure the ball joint is seated correctly.
Steering
1 Tie Rod End Nut
M10 x 1.25
1
Tie Rod End Nut
M10 x 1.25
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
This nut secures the tie rod end to the steering knuckle. Ensure proper alignment before tightening.
Sway Bar
1 Sway Bar Link Nut
M10 x 1.25
1
Sway Bar Link Nut
M10 x 1.25
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
These nuts secure the sway bar links to the sway bar and the strut or control arm. Tighten evenly.
2 Sway Bar Mounting Bracket Bolts
M8 x 1.25
2
Sway Bar Mounting Bracket Bolts
M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
These bolts secure the sway bar mounting brackets to the vehicle's frame or subframe. Tighten evenly.
Rear Suspension
1 Rear Subframe Mounting Bolts
M14 x 2.0
1
Rear Subframe Mounting Bolts
M14 x 2.0
Torque Specification
1. 105 ft-lbs (142 N·m)
2. 90°
Important Notes
These bolts secure the rear subframe to the vehicle chassis. These are torque-to-yield bolts, replace each time they are unfastened.
Front Tension Strut
1 Front Tension Strut Bolts
M14 x 1.5
1
Front Tension Strut Bolts
M14 x 1.5
Torque Specification
1. 85 ft-lbs (115 N·m)
2. 90°
Important Notes
These bolts secure the tension strut to the chassis and control arm. These are torque-to-yield bolts, replace each time they are unfastened.
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 are the torque specifications for the engine head bolts on a 2017-Present BMW 550i?
Q1
What are the torque specifications for the engine head bolts on a 2017-Present BMW 550i?
The torque specification for engine head bolts on a 2017-Present BMW 550i IS 30 Nm (22 lb-ft) for the first tightening, then 60 Nm (44 lb-ft) for the second tightening, followed by an additional 90 degrees of rotation.
Q2 Can I use a regular torque wrench to tighten suspension components on my BMW 550i?
Q2
Can I use a regular torque wrench to tighten suspension components on my BMW 550i?
No, it IS recommended to use an angle-torque wrench for suspension components. This type of wrench ensures that the bolts are tightened to the correct torque specification and angle, which IS crucial for the proper suspension performance and safety.
Q3 How often should I check the torque of the lug nuts on my BMW 550i?
Q3
How often should I check the torque of the lug nuts on my BMW 550i?
Lug nuts should be re-torqued after the first 50-100 miles (80-160 km) of driving on new or rotated tires. After that, it IS recommended to check and re-torque the lug nuts every 6 months or 5,000 miles (8,000 km), whichever comes first.
Q4 What are the torque specifications for the brake caliper bolts on a 2017-Present BMW 550i?
Q4
What are the torque specifications for the brake caliper bolts on a 2017-Present BMW 550i?
The torque specification for the brake caliper bolts on a 2017-Present BMW 550i IS 110 Nm (81 lb-ft) for the front calipers and 70 Nm (52 lb-ft) for the rear calipers.
Q5 Can I use any type of lubricant on bolts when tightening them on my BMW 550i?
Q5
Can I use any type of lubricant on bolts when tightening them on my BMW 550i?
No, it IS crucial to use the specified lubricant recommended by BMW for each particular bolt or component. Using an incorrect lubricant can affect the torque specification and compromise the integrity of the connection.
Q6 How do I ensure that the torque applied to a bolt IS accurate?
Q6
How do I ensure that the torque applied to a bolt IS accurate?
To ensure accurate torque application, use a properly calibrated torque wrench. Follow the specified torque sequence and tightening pattern for each component to achieve the correct and even distribution of force.
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
Digital Torque Wrench (10-100 Nm)
Essential for tightening fasteners to precise torque specifications, preventing damage and ensuring proper assembly. This range IS suitable for many applications on the 550i.
- Digital display for accurate readings
- Audible alarm when target torque IS reached
- Multiple units (Nm, ft-lb, in-lb)
- Reversible ratcheting mechanism
Service Procedures
Engine Component Bolt Torque Specifications
Step-by-step guide with torque values for various engine components on the 550i.
- Locate the component to be tightened.
- Refer to the appropriate torque specification chart below.
- Use a digital torque wrench to tighten the fastener to the specified torque.
- Safety note: Always refer to the vehicle's service manual for specific torque values and tightening procedures.
Technical Service Bulletins
5 Series (F10): Engine Crankshaft Bolt Recall
2018-03-22This bulletin addresses a potential issue with the engine crankshaft bolt on certain 2017-2018 550i models. The bolt may not have been properly tightened during manufacturing, which can lead to engine failure.
2017-2018 BMW 550i
Resolution: BMW authorized technicians must inspect and, if necessary, replace the crankshaft bolt to the correct torque specification of 500 Nm.
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The information provided on this website is for general informational purposes only. While we strive to maintain accuracy in our content, all specifications, procedures, and technical information should be verified against your vehicle's official service manual or with the manufacturer directly.
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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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