BMW Vehicle Models 335i 2012-2018 Torque Specifications
BMW Vehicle Models 335i 2012-2018

BMW Vehicle Models 335i 2012-2018 Torque Specifications

Complete BMW Vehicle Models 335i 2012-2018 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

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

Star Pattern torque pattern diagram showing proper bolt tightening sequence
Cross Pattern

Used for gaskets and cover plates

Cross Pattern torque pattern diagram showing proper bolt tightening sequence
Sequential Pattern

Used for head bolts and other critical components

Sequential Pattern torque pattern diagram showing proper bolt tightening sequence

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

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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Search by component name, bolt size, or description

Torque Calculator

Convert between different torque units

3.0l Engine

Torque specifications for 3.0L Engine

Cylinder Head

1

Cylinder Head Bolts

M12 x 1.75
Torque Specification
1. 18 ft-lbs (24 N·m) 2. 90° 3. 90°
Important Notes
Torque to 18 ft-lbs (24 N·m) then angle-tighten 90 degrees, then 90 degrees in the correct sequence. These are torque-to-yield bolts and must be replaced.
2

Camshaft Bearing Cap Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Torque to 7 ft-lbs (10 N·m) in sequence.
3

Camshaft Sprocket Bolts

M10 x 1.25
Torque Specification
75 ft-lbs (102 N·m)
Important Notes
Torque to 75 ft-lbs (102 N·m). Verify the correct tightening procedure as some engines may have a torque plus angle sequence.
4

Rocker Arms/Shafts Bolts

M8 x 1.25
Torque Specification
23 ft-lbs (31 N·m)
Important Notes
Torque to 23 ft-lbs (31 N·m).
5

Valve Cover Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Torque to 7 ft-lbs (10 N·m) in sequence. Use new gasket.
6

Variable Valve Timing (VANOS) Unit Bolts

M8 x 1.25
Torque Specification
1. 18 ft-lbs (24 N·m) 2. 60°
Important Notes
Torque to 18 ft-lbs (24 N·m), then angle-tighten 60 degrees. Verify the exact torque procedure.

Engine Block

1

Main Bearing Bolts

M12 x 1.5
Torque Specification
1. 22 ft-lbs (30 N·m) 2. 70° 3. 50°
Important Notes
Torque to 22 ft-lbs (30 N·m), then angle-tighten 70 degrees, then 50 degrees in sequence. These are torque-to-yield bolts and must be replaced.
2

Connecting Rod Nuts

M9 x 1.0
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Torque to 20 ft-lbs (27 N·m). Some models may have a torque plus angle tightening sequence.
3

Oil Pan Bolts

M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Torque to 9 ft-lbs (12 N·m) in sequence. Use a new gasket.
4

Oil Drain Plug Bolt

M14 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Torque to 25 ft-lbs (34 N·m) using a new crush washer.
5

Oil Filter Housing Bolt

M10 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Torque to 20 ft-lbs (27 N·m).
6

Knock Sensor Bolt

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Torque to 18 ft-lbs (24 N·m).

Rotating Assembly

1

Flywheel Bolts

M12 x 1.5
Torque Specification
63 ft-lbs (85 N·m)
Important Notes
Torque to 63 ft-lbs (85 N·m). Use new bolts.
2

Crankshaft Pulley/Harmonic Balancer Bolt

M14 x 1.5
Torque Specification
1. 75 ft-lbs (102 N·m) 2. 60°
Important Notes
Torque to 75 ft-lbs (102 N·m) then angle-tighten 60 degrees. Use a new bolt.

Intake System

1

Throttle Body Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Torque to 7 ft-lbs (10 N·m). Use new gasket.
2

Intake Manifold Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Torque to 18 ft-lbs (24 N·m) in sequence. Use new gaskets.
3

EGR Valve Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Torque to 18 ft-lbs (24 N·m). Use new gasket.

Exhaust System

1

Exhaust Manifold/Headers Bolts

M8 x 1.25
Torque Specification
33 ft-lbs (45 N·m)
Important Notes
Torque to 33 ft-lbs (45 N·m). Use new gasket.

Fuel System

1

Fuel Rail Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Torque to 7 ft-lbs (10 N·m).
2

Fuel Injector Bolts

M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Torque to 9 ft-lbs (12 N·m).

Cooling System

1

Water Pump Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Torque to 18 ft-lbs (24 N·m). Use a new gasket.
2

Water Pump Pulley Bolts

M8 x 1.25
Torque Specification
70 ft-lbs (95 N·m)
Important Notes
Torque to 70 ft-lbs (95 N·m).
3

Thermostat Housing Bolts

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Torque to 11 ft-lbs (15 N·m). Use new gasket.
4

Coolant Temp Sensor

M10 x 1.0
Torque Specification
14 ft-lbs (19 N·m)
Important Notes
Torque to 14 ft-lbs (19 N·m).

Ignition System

1

Ignition Coil Bolt

M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Torque to 9 ft-lbs (12 N·m).
2

Spark Plugs

M12 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Torque to 18 ft-lbs (24 N·m).

Ancillary Components

1

Oil Cooler Bolts/Fittings

M10 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Torque to 20 ft-lbs (27 N·m).

8hp Transmission

Torque specifications for 8hp Transmission

Transmission Mounting

1

Transmission Mounting Bolts

M12 x 1.75
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Ensure all bolts are tightened to the specified torque. Torque value may vary slightly depending on the vehicle model.

Oil Pan

1

Transmission Oil Pan Bolts

M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Tighten bolts in a criss-cross pattern to ensure even pressure and prevent leaks. Over-tightening may damage the pan or seal.
2

Transmission Fluid Pan Drain Plug

M14 x 1.5
Torque Specification
12 ft-lbs (16 N·m)
Important Notes
Always use a new crush washer when installing the drain plug. Over-tightening may strip the threads in the pan. This is an estimated value; consult the specific service manual.

Fill Drain Plugs

1

Transmission Drain and Fill Plugs

M18 x 1.5
Torque Specification
32 ft-lbs (43 N·m)
Important Notes
Always use a new crush washer when installing the drain and fill plugs. Over-tightening can damage the plug or the transmission case.

Mechatronics Unit

1

Mechatronics Unit Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Tighten bolts in a specified sequence (usually an alternating or spiral pattern) to ensure even pressure and prevent leaks. This is an estimated value; consult the specific service manual.

Bell Housing

1

Transmission Bell Housing Bolts

M12 x 1.75
Torque Specification
45 ft-lbs (61 N·m)
Important Notes
Always use new bolts when reassembling as these are typically stretch bolts. Torque may vary slightly depending on the specific engine and application. This is an estimated value; consult the specific service manual.

Torque Converter

1

Torque Converter Bolts

M10 x 1.5
Torque Specification
33 ft-lbs (44 N·m)
Important Notes
Always use new bolts as these are stretch bolts. Tighten bolts evenly and in a star pattern.

Cooler Lines

1

Transmission Cooler Line Fittings

M16 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Always use new crush washers when installing cooler line fittings. Over or under-torquing these fittings can cause leaks and should be torqued carefully. This is an estimated value; consult the specific service manual.

Body

Torque specifications for Body

Wheels And Tires

1

Wheel Lug Nuts

M14 x 1.25
Torque Specification
91 ft-lbs (123 N·m)
Important Notes
Tighten lug nuts in a star pattern. Ensure the wheel is flush against the hub before tightening. Torque value is an average within the range specified.

Fuel System

1

Fuel Tank Strap Bolts

M8 x 1.25
Torque Specification
28 ft-lbs (38 N·m)
Important Notes
Ensure fuel tank is properly supported before tightening. Torque value is an average within the range specified.
2

Fuel Filler Neck Bolts

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Do not overtighten. Torque value is an average within the range specified.

Braking System

1

Brake Caliper Bolts

M12 x 1.5
Torque Specification
85 ft-lbs (115 N·m)
Important Notes
Ensure bolts are properly threaded before tightening. Torque value is an average within the range specified.
2

Brake Caliper Mounting Bracket Bolts

M14 x 1.5
Torque Specification
93 ft-lbs (126 N·m)
Important Notes
Apply a thread locking compound to bolts before installation. Torque value is an average within the range specified.
3

Brake Disc/Drum Retaining Bolts

M8 x 1.25
Torque Specification
53 ft-lbs (72 N·m)
Important Notes
Ensure the brake disc or drum is seated properly before tightening. Torque value is an average within the range specified.

Body Panels

1

Hood Hinge Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure proper hood alignment when tightening. Torque value is an estimated average.
2

Fender Bolts (Inner and Outer)

M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Tighten evenly to ensure proper fender alignment. Torque value is an estimated average.
3

Bumper Mounting Bolts/Nuts

M8 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Ensure bumper is properly aligned before tightening. Torque value is an estimated average.
4

Tail Light/Head Light Bolts

M5 x 0.8
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
Do not overtighten, as damage to the light housing may occur. Torque value is an estimated average.
5

Hood Latch Bolts

M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Ensure the hood latch mechanism functions correctly. Torque value is an estimated average.

Doors And Closures

1

Door Hinge Bolts

M8 x 1.25
Torque Specification
23 ft-lbs (31 N·m)
Important Notes
Ensure proper door alignment when tightening. Torque value is an estimated average.
2

Door Latch/Striker Bolts

M6 x 1.0
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure door closes securely and aligns properly. Torque value is an estimated average.
3

Rear Hatch/Trunk Lid Hinge Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure proper alignment of hatch/trunk lid. Torque value is an estimated average.

Interior

1

Seat Mounting Bolts

M10 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Ensure all bolts are properly threaded before tightening. Torque value is an estimated average.

Brakes

Torque specifications for Brakes

Caliper Assembly

1

Brake Caliper Mounting Bolts

M12 x 1.75
Torque Specification
85 ft-lbs (115 N·m)
Important Notes
Tighten to specified torque. Ensure the caliper is correctly aligned before final tightening. Apply thread locker if specified by the vehicle's service manual.
2

Brake Caliper Guide Pin Bolts

M8 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Ensure guide pins are properly lubricated before installation. Do not over-tighten to prevent damage to the caliper guide pin boots.

Caliper Mounting Bracket

1

Caliper Mounting Bracket Bolts

M14 x 1.5
Torque Specification
92 ft-lbs (125 N·m)
Important Notes
Tighten in a criss-cross pattern. Proper torque is critical for stability. Use a thread locker compound if specified by the vehicle's service manual.

Rotor And Drum

1

Brake Disc/Drum Retaining Bolts

M8 x 1.25
Torque Specification
53 ft-lbs (72 N·m)
Important Notes
Ensure rotor is properly seated against the hub before tightening these bolts. Do not over tighten as these bolts are often small.

Wheel Mounting

1

Wheel Lug Nuts

M12 x 1.5
Torque Specification
91 ft-lbs (123 N·m)
Important Notes
Tighten in a star pattern. Ensure the wheel is seated flush against the hub before tightening. Recheck after first 50-100 miles of driving.

Brake Lines And Hoses

1

Brake Hose Mounting Bracket Bolts

M6 x 1.0
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure the hose bracket is correctly aligned. Do not over-tighten to avoid damage to the bracket or chassis.
2

Brake Line Flare Nuts (To Caliper)

M10 x 1.0
Torque Specification
12 ft-lbs (16 N·m)
Important Notes
Ensure the flare nut is properly seated and the line is correctly aligned. Do not over-tighten to avoid damaging the brake line or fitting.

Master Cylinder And Booster

1

Brake Master Cylinder Bolts (To Booster)

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure the master cylinder is properly seated against the brake booster before tightening. Do not over-tighten to avoid damage to the cylinder or booster.
2

Brake Booster Mounting Bolts

M10 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Ensure the brake booster is properly seated against the firewall. Do not over-tighten the bolts.

Drivetrain

Torque specifications for Drivetrain

Engine Flywheel

1

Flywheel Bolts

M12 x 1.5
Torque Specification
63 ft-lbs (85 N·m)
Important Notes
Tighten in a star pattern in multiple passes. Always use new bolts.
2

Clutch Pressure Plate Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Tighten in a star pattern in multiple passes.

Transmission

1

Transmission Mounting Bolts

M12 x 1.75
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Tighten evenly, ensuring transmission is properly aligned.
2

Transmission Oil Pan Bolts

M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Tighten in a criss-cross pattern. Do not over-tighten to avoid damaging the pan.
3

Transmission Drain and Fill Plugs

M22 x 1.5
Torque Specification
33 ft-lbs (45 N·m)
Important Notes
Use new sealing washer. Do not over-tighten to avoid stripping threads.

Propeller Shaft

1

Propeller Shaft Bolts (to Transmission and Differential Flanges)

M10 x 1.5
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure proper alignment during installation. Use new bolts when possible.
2

Guibo/Flex Disc Bolts

M10 x 1.5
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Use new bolts. Tighten evenly to ensure proper disc alignment.
3

Center Support Bearing Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure bearing is properly aligned before tightening.

Differential

1

Differential Input Flange Bolt

M10 x 1.5
Torque Specification
65 ft-lbs (88 N·m)
Important Notes
Torque evenly to ensure the proper contact between flanges.
2

Differential Output Flange Bolts

M10 x 1.5
Torque Specification
65 ft-lbs (88 N·m)
Important Notes
Torque evenly to ensure proper contact between flanges.
3

Differential Drain and Fill Plugs

M18 x 1.5
Torque Specification
33 ft-lbs (45 N·m)
Important Notes
Use new sealing washer. Do not over-tighten to avoid stripping threads.

Drive Axles

1

Drive Axle/Half Shaft Bolts (to Differential or Transmission Flange)

M10 x 1.5
Torque Specification
70 ft-lbs (95 N·m)
Important Notes
Ensure proper alignment of the axle and flange.
2

CV Joint/Axle Nut

M24 x 1.5
Torque Specification
195 ft-lbs (265 N·m)
Important Notes
Use new nut. This is a critical component for wheel bearing preload.

Transfer Case

1

Transfer Case Mounting Bolts

M12 x 1.75
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Tighten evenly, ensuring transfer case is properly aligned.
2

Transfer Case Drain and Fill Plugs

M18 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Use new sealing washer. Do not over-tighten to avoid stripping threads.

Electrical

Torque specifications for Electrical

Ignition System

1

Ignition Coil Mounting Bolt

M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Ensure proper torque for reliable electrical contact and heat transfer. Over-tightening may damage the coil or its mount.

Starter System

1

Starter Motor Mounting Bolt

M10 x 1.5
Torque Specification
33 ft-lbs (45 N·m)
Important Notes
Proper torque is essential for alignment with the flywheel and proper grounding. Over-tightening may damage motor housing or threads.

Charging System

1

Alternator Mounting Bolt

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Correct torque ensures proper belt tension and electrical ground. Loose bolts can cause belt slippage, a charging system malfunction, or poor grounding. Over-tightening could potentially damage the alternator housing or mounting bracket.

Battery System

1

Battery Terminal Nut

M6 x 1.0
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
Proper torque ensures a good electrical connection and prevents damage to the soft lead battery terminals. Avoid over-tightening.

Engine Control Unit

1

ECU Mounting Bolt

M6 x 1.0
Torque Specification
7 ft-lbs (9.5 N·m)
Important Notes
Proper torque minimizes vibration and provides a good ground path. Overtightening may damage the ECU.
2

ECU Bracket Mounting Bolt

M8 x 1.25
Torque Specification
14 ft-lbs (19 N·m)
Important Notes
The ECU bracket provides a secure platform for the ECU and an additional level of grounding. Ensure proper torque for overall system stability.

Grounding System

1

Ground Strap/Cable Mounting Bolt

M8 x 1.25
Torque Specification
17 ft-lbs (23 N·m)
Important Notes
Proper torque ensures good electrical connection to chassis and engine. This value is approximate, check specific repair manual for the exact component.

Sensor System

1

Crankshaft/Camshaft Position Sensor Mounting Bolt

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Proper torque is critical for maintaining sensor position and ground. Overtightening may damage the sensor body. This is an estimated value.

Wiring Harness System

1

Wiring Harness Connector Mounting Screw

M4 x 0.7
Torque Specification
3 ft-lbs (4 N·m)
Important Notes
Hand-tighten plus an additional 1/4 turn past hand tight. These are typically small fasteners into plastic connectors, over tightening will cause damage.

Emissions Sensors

Torque specifications for Emissions_sensors

Exhaust System

1

Exhaust Manifold/Headers to Cylinder Head Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Use a criss-cross pattern for tightening. Ensure clean threads and new gaskets are used.
2

Catalytic Converter to Exhaust Pipe Bolts

M10 x 1.5
Torque Specification
32 ft-lbs (43 N·m)
Important Notes
Ensure bolts are tightened evenly to prevent leaks. Use new gaskets and inspect the flange for damage or corrosion. Torque values may vary based on specific flange design.
3

Oxygen Sensor (O2 Sensor) Mounting

M18 x 1.5
Torque Specification
33 ft-lbs (45 N·m)
Important Notes
Estimated value. Use a thread lubricant or anti-seize compound on the threads of the sensor. Be careful not to cross-thread the sensor. Ensure a new crush washer is used if specified.
4

NOx Sensor Mounting

M20 x 1.5
Torque Specification
26 ft-lbs (35 N·m)
Important Notes
Estimated value. Use a thread lubricant or anti-seize compound on the threads of the sensor. Be careful not to cross-thread the sensor. Some NOx sensors require specific orientation, follow manufacturer's instructions. Ensure new gasket or crush washer is used if specified.

Egr System

1

EGR Valve Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Tighten bolts evenly to avoid warping the valve body. Use a new gasket. Ensure clean threads before installation. Some applications may have a specific tightening pattern; consult the vehicle's service manual.

Intake System

1

Throttle Body Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (9.5 N·m)
Important Notes
Use a criss-cross pattern to ensure even pressure on the gasket. Do not over-tighten. Use a new gasket for proper sealing.
2

Mass Air Flow Sensor (MAF) Mounting Screws

M5 x 0.8
Torque Specification
7 ft-lbs (9.5 N·m)
Important Notes
Estimated value. Be very careful not to over-tighten. Use a criss-cross tightening pattern. If there is a rubber gasket, ensure it is correctly installed and in good condition. Do not use thread locking compound unless specified.

Exhaust

Torque specifications for Exhaust

Exhaust Manifold

1

Exhaust Manifold/Header to Cylinder Head Bolts

M10 x 1.5
Torque Specification
33 ft-lbs (45 N·m)
Important Notes
Apply torque in a star pattern to ensure even clamping force and prevent warping. Check torque after first heat cycle.
2

Exhaust Manifold/Header to Cylinder Head Studs/Nuts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Use a star pattern for tightening. Recheck after the first heat cycle.
3

Exhaust Pipe to Exhaust Manifold/Header Bolts

M10 x 1.5
Torque Specification
33 ft-lbs (45 N·m)
Important Notes
Ensure proper alignment of the exhaust pipe before tightening. Use new gaskets.

Catalytic Converter

1

Catalytic Converter to Exhaust Pipe Bolts

M10 x 1.5
Torque Specification
33 ft-lbs (45 N·m)
Important Notes
Use a new gasket for a proper seal. Inspect for leaks after installation.

Muffler

1

Muffler to Exhaust Pipe Bolts

M10 x 1.5
Torque Specification
33 ft-lbs (45 N·m)
Important Notes
Use new gaskets. Ensure proper alignment before tightening.

Exhaust Clamps

1

Exhaust Flange Clamp Bolt

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure clamp is properly aligned. Torque evenly to ensure proper sealing
2

Downpipe V-Band Clamp Bolt

M6 x 1.0
Torque Specification
12 ft-lbs (16 N·m)
Important Notes
Tighten evenly for proper seal. Do not overtighten, as it may damage the clamp.

O2 Sensor

1

O2 Sensor Torque

M18 x 1.5 (Typical)
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Apply anti-seize compound to sensor threads. Do not overtighten, as it can damage the sensor. This is an estimated value based on common O2 sensor thread size.

Exhaust Hangers

1

Exhaust Hanger/Bracket Mounting Bolt

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure proper alignment of the exhaust hangers before tightening.

Turbocharger

1

Turbocharger to Exhaust Manifold Bolts

M10 x 1.5
Torque Specification
33 ft-lbs (45 N·m)
Important Notes
Apply torque in a star pattern to ensure even clamping force and prevent warping. Use new gaskets and hardware.

Fuel

Torque specifications for Fuel

Fuel Rail

1

Fuel Rail Mounting Bolts

M8 x 1.25
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Ensure proper seating of the fuel rail before tightening bolts. Tighten in a cross pattern to evenly distribute pressure.
2

Fuel Injector Mounting Bolts

M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Use new o-rings or seals on the injectors to prevent leaks. Do not over-tighten.

Fuel Pump

1

Fuel Pump Module Mounting Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure the fuel pump module is correctly seated in the tank before tightening. Use new seals or gaskets if necessary.
2

Fuel Tank Strap Bolts

M12 x 1.75
Torque Specification
28 ft-lbs (38 N·m)
Important Notes
Ensure straps are correctly positioned before tightening. Tighten evenly on both sides.
3

Fuel Filler Neck Mounting Bolts

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Make sure the filler neck is properly aligned before tightening.
4

In-Tank Fuel Level Sensor/ Sending Unit Retaining Ring/Screws

M4 x 0.7
Torque Specification
4 ft-lbs (5 N·m)
Important Notes
This is an estimated value. Retaining rings should be tightened to the correct position but not overtightened. Small screws should only be tightened to prevent leaks and avoid damage.

Fuel Filter

1

Fuel Filter Bolt/Nut

M10 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Use new crush washers or seals if applicable. Ensure proper alignment before tightening.

High Pressure Fuel Pump

1

High-Pressure Fuel Pump Mounting Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
This is an estimated value. Ensure the HPFP is properly aligned. Tighten bolts in a cross pattern to ensure even pressure. This is an important component for proper sealing.

Fuel Lines And Fittings

1

Fuel Line Banjo Bolt/Fittings

M12 x 1.5
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
This is an estimated value. Always use new crush washers when installing banjo bolts. Ensure proper alignment to prevent damage to the line. Multiple locations of this fitting exist with varying sizes.
2

Low-Pressure Fuel Sensor Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
This is an estimated value. Ensure the sensor is properly seated and use new o-rings where applicable. Do not over tighten.

Hvac

Torque specifications for Hvac

Ac Compressor

1

A/C Compressor Mounting Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Torque bolts evenly and in a cross pattern. Ensure bolts are clean and lightly lubricated with engine oil before installation.

Ac Lines

1

A/C Line Fittings (General)

Varies, typically M6 x 1.0 to M10 x 1.25, estimate M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Estimated value, verify with the service manual for your vehicle. Use new O-rings and lubricate them with refrigerant oil before assembly. Over tightening can damage the fittings and O-rings.

Blower Motor

1

Blower Motor Mounting Bolts

M5 x 0.8
Torque Specification
7 ft-lbs (9.5 N·m)
Important Notes
Tighten bolts evenly. Do not over tighten. Estimated value based on component size and material.

Control Module

1

HVAC Control Module Mounting Bolts

M4 x 0.7
Torque Specification
5 ft-lbs (6.8 N·m)
Important Notes
These bolts are small and require a low torque setting. Do not over tighten. Estimated value based on component size and material.

Condenser

1

Condenser Mounting Bolts/Brackets

M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Ensure the condenser is properly positioned and supported before final tightening. Estimated value based on component size and material.

Evaporator

1

Evaporator Housing Mounting Bolts

M5 x 0.8
Torque Specification
7 ft-lbs (9.5 N·m)
Important Notes
Avoid over tightening to prevent damage to the plastic housing. Estimated value based on component size and material.

Expansion Valve

1

Expansion Valve Mounting Bolts

M5 x 0.8
Torque Specification
7 ft-lbs (9.5 N·m)
Important Notes
Use new O-rings and lubricate them with refrigerant oil before assembly. Avoid over tightening as it can damage the valve. Estimated value based on component size and material.

Receiver Drier

1

Receiver Drier/Accumulator Mounting Bolts

M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Ensure the receiver drier is properly positioned and supported before final tightening. Estimated value based on component size and material.

Blend Door Actuator

1

HVAC Blend Door Actuator Mounting Bolts

M4 x 0.7
Torque Specification
5 ft-lbs (6.8 N·m)
Important Notes
These are small bolts and must be tightened carefully to avoid damage. Estimated value based on component size and material.

Suspension

Torque specifications for Suspension

Front Suspension

1

Strut to Steering Knuckle Bolts

M14 x 1.5
Torque Specification
65 ft-lbs (88 N·m)
Important Notes
Ensure proper alignment of the strut before tightening. Use new bolts if they are torque-to-yield.
2

Strut Top Mount Bolts (to Body)

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Tighten in a star pattern to ensure even clamping force.
3

Control Arm to Chassis Bolts

M12 x 1.5
Torque Specification
65 ft-lbs (88 N·m)
Important Notes
Ensure suspension is at normal ride height before final tightening.
4

Control Arm Ball Joint Nut

M10 x 1.5
Torque Specification
33 ft-lbs (45 N·m)
Important Notes
Do not over-tighten the nut, as this can damage the ball joint.
5

Tie Rod End Nut

M12 x 1.5
Torque Specification
33 ft-lbs (45 N·m)
Important Notes
Securely fasten tie rod end to steering knuckle.
6

Sway Bar Link Nut

M10 x 1.5
Torque Specification
33 ft-lbs (45 N·m)
Important Notes
Ensure the sway bar link is properly seated before tightening.

Rear Suspension

1

Shock Absorber Lower Mounting Bolt

M12 x 1.5
Torque Specification
65 ft-lbs (88 N·m)
Important Notes
Ensure the shock absorber is correctly aligned before tightening.
2

Shock Absorber Top Mount Bolts (to Body)

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Tighten in a star pattern to ensure even clamping force.
3

Trailing Arm Mounting Bolts

M12 x 1.5
Torque Specification
1. 75 ft-lbs (102 N·m) 2. 90°
Important Notes
These are torque-to-yield bolts and must be replaced whenever removed. Use a new bolt for proper torque application.
4

Control Arm to Chassis Bolts

M12 x 1.5
Torque Specification
65 ft-lbs (88 N·m)
Important Notes
Ensure suspension is at normal ride height before final tightening.
5

Control Arm to Knuckle Bolts

M12 x 1.5
Torque Specification
65 ft-lbs (88 N·m)
Important Notes
Ensure suspension is at normal ride height before final tightening.
6

Sway Bar Link Nut

M10 x 1.5
Torque Specification
33 ft-lbs (45 N·m)
Important Notes
Ensure the sway bar link is properly seated before tightening.

Subframes

1

Front Subframe Mounting Bolts

M14 x 2.0
Torque Specification
1. 80 ft-lbs (108 N·m) 2. 90°
Important Notes
These are torque-to-yield bolts and must be replaced whenever removed. Tighten in a cross pattern.
2

Rear Subframe Mounting Bolts

M14 x 2.0
Torque Specification
90 ft-lbs (122 N·m)
Important Notes
These bolts should be replaced when removed. Tighten in a cross pattern.

Sway Bar

1

Sway Bar Mounting Bracket Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure the sway bar is positioned correctly before tightening.

Strut Tower

1

Strut Tower Brace/Support Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Tighten in a star pattern to ensure even clamping force.

Ride Height Sensors

1

Ride Height Sensor Linkage Bolts/Nuts

M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
These bolts and nuts are small and should not be over torqued. Estimated value, check service manual for vehicle.

Troubleshooting Guide

Common issues, diagnostic steps, and prevention guidelines

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

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

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 setting for the engine cylinder head bolts?

110 Nm [81 ft-lbs] + 90°

Q2

What type of torque wrench should be used for critical bolts like connecting rods?

A calibrated digital or click-type torque wrench IS recommended to ensure precision.

Q3

How do I determine the correct tightening sequence for a component?

Refer to the BMW Repair Manual for the specific component and follow the designated tightening pattern.

Q4

What IS the recommended lubricant for spark plug threads?

Apply anti-seize compound sparingly to the spark plug threads to prevent seizing.

Q5

Can I use an impact wrench to tighten bolts?

No, impact wrenches should not be used for tightening critical bolts as they can over-tighten or damage the bolt.

Q6

What IS the torque setting for the oil drain plug?

25 Nm [18 ft-lbs]

Environmental Considerations

Temperature, humidity, and seasonal effects on torque specifications

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

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

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
Service Procedures

Bolt Torque Specifications for BMW 335i (2012-2018)

This technical document provides the complete torque specifications for all critical bolts and fasteners on the BMW 335i models produced between 2012 and 2018.

  • **Engine:**
  • Cylinder head bolts: 80 Nm + 90° + 90°
  • Intake manifold bolts: 25 Nm
  • Exhaust manifold bolts: 30 Nm + 90°
  • **Drivetrain:**
  • Driveshaft bolts: 100 Nm + 90°
  • Rear differential bolts: 80 Nm + 90°
  • **Suspension:**
  • Front control arm bolts: 90 Nm + 90°
  • Rear control arm bolts: 100 Nm + 90°
  • **Brakes:**
  • Brake caliper bolts: 120 Nm
  • Brake rotor bolts: 30 Nm
  • **Body:**
  • Front bumper bolts: 15 Nm
  • Rear bumper bolts: 20 Nm
  • Hood bolts: 10 Nm
View full procedure
Technical Service Bulletins

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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.
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About the Author

Expert automotive knowledge and experience

Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

ASE Master Certified Technician with over a decade of hands-on experience in automotive repair and diagnostics.

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