BMW M3 2015-2020 Drivetrain Bolt Torque Specifications & Fastener Values
BMW M3 2015-2020

BMW M3 2015-2020 Drivetrain Bolt Torque Specifications

Comprehensive list of drivetrain bolt torque specifications for the 2015-2020 BMW M3 (F80) chassis, including transmission, differential, and driveshaft components.

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

Search Specifications

Search by component name, bolt size, or description

Torque Calculator

Convert between different torque units

Engine To Transmission

Specifications for bolts connecting the engine and transmission, ensuring proper alignment and power transfer.

1

Flywheel Bolts

M12 x 1.25
Torque Value
66 ft-lbs (90 N·m)
Important Notes
Ensure flywheel is properly seated on the crankshaft before torquing. Use new bolts if specified by manufacturer.
2

Clutch Pressure Plate Bolts

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Tighten bolts in a star pattern to evenly distribute pressure. Ensure clutch disk is properly centered.
3

Clutch Slave Cylinder Bolts

M6 x 1.0
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Ensure proper alignment of slave cylinder on the transmission bell housing. Check for any fluid leaks after installation.
4

Transmission Mounting Bolts

M12 x 1.75
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Tighten all bolts evenly to ensure proper alignment of transmission to engine block.

Transmission

Specifications for bolts securing components of the transmission, such as the oil pan and drain plugs.

1

Transmission Oil Pan Bolts

M6 x 1.0
Torque Value
8 ft-lbs (10 N·m)
Important Notes
Tighten bolts in a criss-cross pattern to ensure even sealing. Use a new gasket if required.
2

Transmission Drain and Fill Plugs

M22 x 1.5
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Use new sealing washer to prevent leaks. Do not over tighten.
3

Input Shaft Flange Nut/Bolt (Transmission)

M12 x 1.5
Torque Value
66 ft-lbs (90 N·m)
Important Notes
Ensure proper alignment of flange. Check for any staked nut/bolt requirements. Staking is critical where applicable.
4

Output Shaft Flange Nut/Bolt (Transmission)

M12 x 1.5
Torque Value
66 ft-lbs (90 N·m)
Important Notes
Ensure proper alignment of flange. Check for any staked nut/bolt requirements. Staking is critical where applicable.

Driveshaft

Specifications for bolts securing the driveshaft to the transmission and differential.

1

Propeller/Drive Shaft Bolts

M10 x 1.5
Torque Value
81 ft-lbs (110 N·m)
Important Notes
Tighten bolts evenly to ensure proper driveshaft balance. Verify bolt length, and that there is no interference before torquing.

Transfer Case

Specifications for bolts securing the transfer case components.

1

Transfer Case Drain/Fill Plug

M22 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Use new sealing washer to prevent leaks. Do not over tighten. Check fill levels for manufacturer's specifications.
2

Input Shaft Flange Nut/Bolt (Transfer Case)

M12 x 1.5
Torque Value
66 ft-lbs (90 N·m)
Important Notes
Ensure proper alignment of flange. Check for any staked nut/bolt requirements. Staking is critical where applicable.
3

Output Shaft Flange Nut/Bolt (Transfer Case)

M12 x 1.5
Torque Value
66 ft-lbs (90 N·m)
Important Notes
Ensure proper alignment of flange. Check for any staked nut/bolt requirements. Staking is critical where applicable.

Differential

Specifications for bolts securing the differential to the chassis and its internal components.

1

Differential Mounting Bolts

M12 x 1.75
Torque Value
81 ft-lbs (110 N·m)
Important Notes
Ensure proper alignment of differential to chassis before torquing. Some bolts may have slightly different torque values based on location, please check your service manual.
2

Differential Drain/Fill Plug

M22 x 1.5
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Use new sealing washer to prevent leaks. Do not over tighten.

Axles

Specifications for bolts and nuts securing the axle shafts and CV joints.

1

Drive Axle/Half Shaft Bolts

M10 x 1.5
Torque Value
81 ft-lbs (110 N·m)
Important Notes
Ensure proper alignment of the axle shaft to the transmission/differential output flange and wheel hub. Verify bolt length, and that there is no interference before torquing.
2

CV Joint/Axle Nut

M24 x 1.5
Torque Value
185 ft-lbs (250 N·m)
Important Notes
Ensure the nut is properly aligned. This nut is a high-torque application, and should be torqued in a single pull. Staking of nut is critical if applicable.

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

Why are proper torque specifications important for drivetrain bolts?

Correct torque ensures proper clamping force, preventing bolts from loosening due to vibration, shear forces, and thermal expansion. Under-torquing can lead to component failure, while over-torquing can damage bolts or threads, potentially causing catastrophic failure in the drivetrain.

Q2

What happens if I over-torque a driveshaft bolt?

Over-torquing a driveshaft bolt can stretch or even break the bolt, damage the threads in the driveshaft flange or transfer case, and potentially lead to vibrations or failure. Over-torquing may also permanently damage the components involved, making future removal and maintenance difficult.

Q3

Can I reuse drivetrain bolts on my BMW M3?

Generally, it is recommended to replace specific drivetrain bolts, especially those subject to high stress (like driveshaft and differential bolts), after each use, as they may stretch or weaken. Check the specific bolt type and BMW service recommendations, as reusing some bolts can lead to decreased clamping force and potential component failure. Always use new bolts if specified by the manufacturer.

Q4

What tools do I need to properly torque drivetrain bolts?

You will need a calibrated torque wrench (preferably a click-type or digital torque wrench for accuracy), sockets in the correct sizes, potentially extensions or universal joints to reach bolts, and possibly a torque angle meter for bolts that require a torque angle specification after the initial torque. Additionally, a good understanding of torque wrench usage is crucial. Always verify the calibration of your torque wrench.

Q5

What does 'torque to yield' mean and how does it apply to drivetrain bolts?

'Torque to yield' means the bolt is tightened to a point where it undergoes plastic deformation, stretching permanently. This provides high clamping force and makes the bolt suitable for its intended use, however makes it unsuitable for re-use. This is common with many of the driveshaft and differential bolts. Do not re-use TTY bolts.

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

Torque Wrench (1/2 inch drive)

A calibrated torque wrench is essential for accurately tightening bolts to the specified torque values. A 1/2 inch drive is versatile for most drivetrain components.

  • Adjustable torque settings
  • Click-type mechanism for precise application
  • Reversible ratchet
Learn more

Torque Wrench (3/8 inch drive)

A smaller 3/8 inch drive torque wrench is useful for bolts with lower torque requirements, such as those found on the transmission pan.

  • Adjustable torque settings
  • Click-type mechanism for precise application
  • Reversible ratchet
Learn more

Socket Set (Metric)

A comprehensive metric socket set is needed to fit the various bolt heads on the BMW M3 drivetrain components. Sizes will vary.

  • Various sizes from 8mm-24mm
  • 6-point sockets for secure grip
  • Both deep and shallow sockets
Learn more

Extension Bars

Extension bars of various lengths are needed to reach recessed bolts, especially when working around chassis components.

  • 1/2 and 3/8 inch drive
  • Various lengths (3 inch, 6 inch, 10 inch)
  • Made from high-strength steel
Learn more

Universal Joint

A universal joint allows the socket to access bolts at an angle, improving access in tight spaces.

  • 1/2 and 3/8 inch drive options
  • Durable steel construction
  • Allows for angles when access is difficult
Learn more
Service Procedures

Differential Mounting Bolt Torque Procedure

This procedure outlines the steps for torquing the bolts that secure the differential to the subframe.

  • 1. Locate all differential mounting bolts.
  • 2. Using the appropriate socket and extension, apply initial torque (typically 50 Nm) to all bolts in a criss-cross pattern.
  • 3. Tighten each bolt to the final specified torque (typically 100 Nm + 90 degrees) in the same pattern.
  • 4. If applicable, torque the additional smaller bolts to their specified value (typically 30 Nm).
View full procedure

Driveshaft Bolt Torque Procedure

This procedure details the correct way to torque the bolts securing the driveshaft to the transmission and differential flanges.

  • 1. Locate all driveshaft flange bolts.
  • 2. Using the appropriate socket and extension, install bolts to initial torque (typically 30 Nm) in a staggered pattern to center the driveshaft.
  • 3. Tighten the bolts to the final torque value (typically 60 Nm + 90 degrees) in the same pattern, ensuring even application of force.
  • 4. Verify all bolts are torqued correctly
View full procedure

Transmission Pan Bolt Torque Procedure

This procedure guides you through tightening the bolts of the transmission pan after a fluid change or service.

  • 1. Locate the transmission pan bolts.
  • 2. Using a 3/8 inch drive torque wrench and the correct socket, tighten all bolts to an initial low torque value (typically 10 Nm) in a criss-cross pattern.
  • 3. Tighten all bolts in the same pattern to the final specified torque value (typically 15 Nm).
  • 4. Double-check all bolts to ensure consistent torque application.
View full procedure
Technical Service Bulletins

SI B27 04 16 - Drivetrain Vibration Complaints

2016-04-15

This bulletin addresses drivetrain vibration concerns in F80 M3 vehicles and outlines the diagnostic and repair procedures.

2015-2016 BMW M3

Resolution: Inspect and replace the driveshaft center support bearing if damaged. Ensure proper torque of all driveshaft and differential fasteners.

SI B26 01 18 - Rear Differential Oil Leak

2018-01-10

This bulletin outlines the procedure for fixing oil leaks from the rear differential due to improper torque of the cover bolts.

2015-2018 BMW M3

Resolution: Replace the differential cover gasket. Tighten all differential cover bolts to specified torque values (Typically 65 Nm).

SI B23 03 19 - Transmission Mount Failure

2019-03-22

This bulletin outlines the procedure for replacing the transmission mounts and includes torque specification for the bolts.

2017-2020 BMW M3

Resolution: Inspect transmission mounts for damage. Replace mounts as necessary and tighten bolts to specified torque value (Typically 56 Nm).

About the Author

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Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

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