BMW 750i 2008-2015 Drivetrain Bolt Torque Specifications & Fastener Values
BMW 750i 2008-2015

BMW 750i 2008-2015 Drivetrain Bolt Torque Specifications

Detailed torque specifications for drivetrain bolts on the 2008-2015 BMW 750i (F01/F02 chassis). Includes front differential, rear differential, driveshaft, and transmission mounting bolts.

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 Flywheel

Components related to the connection between the engine and the transmission, including the flywheel (manual transmission) or flexplate (automatic transmission) and associated components.

1

Flywheel Bolts

M12 x 1.5
Torque Value
59 ft-lbs (80 N·m)
Important Notes
Use new bolts. Tighten in a star pattern to ensure even clamping pressure. Apply a small amount of engine oil to bolt threads.
2

Flexplate Bolts

M12 x 1.5
Torque Value
59 ft-lbs (80 N·m)
Important Notes
Use new bolts. Tighten in a star pattern to ensure even clamping pressure. Apply a small amount of engine oil to bolt threads.
3

Torque Converter Bolts

M10 x 1.25
Torque Value
35 ft-lbs (47 N·m)
Important Notes
These bolts connect the torque converter to the flexplate. Tighten evenly and carefully. Apply a small amount of engine oil to bolt threads.

Transmission Mounting

Bolts that secure the transmission to the engine block and/or chassis of the vehicle.

1

Transmission Mounting Bolts

M12 x 1.75
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Ensure proper alignment of the transmission before tightening. Apply a small amount of anti-seize to the bolt threads.
2

Transmission Oil Pan Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten these bolts evenly and in a crisscross pattern to prevent leaks. Do not overtighten, or you can cause damage to the transmission pan.
3

Transmission Drain and Fill Plugs

M18 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Use new crush washers for a proper seal. Do not overtighten, or you may damage the transmission case.

Driveshaft

Components that transmit power from the transmission to the differential, including driveshafts, propeller shafts, and center support bearings.

1

Propeller/Drive Shaft Bolts

M10 x 1.5
Torque Value
81 ft-lbs (110 N·m)
Important Notes
Tighten all bolts evenly, and use new bolts when possible. May require a special tool for proper access, and these bolts are likely to be torqued in a star pattern.
2

Center Support Bearing Mounting Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure the bearing is correctly positioned before tightening these bolts. Apply a small amount of anti-seize to the bolt threads.

Axle And Cv Joints

Bolts and nuts that secure the drive axles, half-shafts, and CV joints.

1

Drive Axle/Half Shaft Bolts

M12 x 1.5
Torque Value
147 ft-lbs (200 N·m)
Important Notes
These bolts connect the drive axle to the transmission or differential flange. Always double check for proper torque.
2

Rear Drive Axle Flange Bolts

M10 x 1.5
Torque Value
60 ft-lbs (80 N·m)
Important Notes
These bolts connect the axle shaft to the rear differential flange. Ensure the bolts are properly aligned, and use new hardware if it has any indication of damage. Tighten in a star pattern to ensure even clamping pressure.
3

CV Joint/Axle Nut

M24 x 1.5
Torque Value
129 ft-lbs (175 N·m)
Important Notes
This is the main nut securing the CV joint to the wheel hub. Use new hardware when possible, and ensure proper torque is achieved.

Differential

Components related to the differential, including mounting hardware and drain/fill plugs.

1

Differential Mounting Bolts

M12 x 1.75
Torque Value
60 ft-lbs (80 N·m)
Important Notes
These bolts secure the differential to the vehicle's chassis or subframe. Ensure proper alignment before tightening. This is an estimated value; refer to the service manual for your specific vehicle.
2

Differential Drain/Fill Plugs

M18 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Use new crush washers for a proper seal. Ensure the drain and fill plugs are clean and properly threaded. Do not overtighten, or you may damage the case.

Transfer Case

Bolts and plugs specific to the transfer case, which is found in 4WD/AWD vehicles.

1

Transfer Case Drain/Fill Plugs

M18 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Use new crush washers for a proper seal. Ensure the plugs are clean and properly threaded. Do not overtighten, or you may damage the case.

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 correct torque specifications important for drivetrain bolts?

Correct torque ensures proper clamping force, preventing bolts from loosening due to vibration and stress. Under-tightening can lead to joint failure, while over-tightening can damage threads or the component itself. For example, overtightening a driveshaft bolt could deform the flange and cause vibrations, while under-tightening could result in the driveshaft detaching.

Q2

What happens if I don't use a torque wrench?

Without a torque wrench, you risk either under- or over-tightening the bolts. 'Feel' is unreliable and can lead to problems such as stripped threads, component damage, or fasteners coming loose during operation. Imagine the consequences of a loose driveshaft flange during a high-speed turn; the car could lose control.

Q3

Do I need to use new bolts for drivetrain components?

For many drivetrain components, especially those subject to high stress like driveshaft bolts and transmission mounts, it's crucial to use new, specified bolts. Some bolts are designed to stretch slightly when torqued, and using old bolts can result in inaccurate clamping force and potential component failure. Always check the BMW service manual for specific recommendations.

Q4

What should I do if I strip a bolt while working on the drivetrain?

If a bolt is stripped, do not attempt to reuse it. Depending on the location and severity, you may need to use a thread repair kit (such as a Helicoil) or replace the damaged component. Continued operation with a stripped bolt can cause serious damage to surrounding parts. For instance, if a wheel hub bolt strips, a wheel can detach.

Q5

Are there different torque specs for different models within the 2008-2015 750i range?

While the general drivetrain design is consistent across the 2008-2015 750i models, it's essential to consult the specific repair manual or online database for your model year. Minor revisions and updates could lead to varied torque specifications. For example, a 2010 model may have slightly different specs for the differential flange bolts compared to a 2014 model.

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. 1/2 inch drive is recommended for drivetrain components.

  • Wide torque range (e.g., 20-150 ft-lbs)
  • Click-type or digital readout
  • Accurate and reliable calibration
Learn more

Torque Wrench (3/8 inch drive)

A smaller torque wrench for lower torque applications, such as some sensor bolts and smaller fasteners on the transmission and differentials.

  • Lower torque range (e.g., 5-80 ft-lbs)
  • Click-type or digital readout
  • Accurate and reliable calibration
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets is required to fit the various bolt and nut sizes on the drivetrain.

  • Standard and deep sockets
  • Sizes ranging from 8mm to 24mm
  • 6-point sockets recommended
Learn more

Extension Bars

Various lengths of extension bars help in accessing recessed bolts and nuts.

  • 1/2 inch and 3/8 inch drive extensions
  • Lengths ranging from 3 inches to 10 inches
  • Secure and sturdy construction
Learn more

Universal Joint

A universal joint adapter allows for torque application at an angle.

  • 1/2 inch and 3/8 inch drive options
  • Durable and allows for smooth articulation
Learn more
Service Procedures

Driveshaft Bolt Torque Procedure

This procedure outlines how to properly torque the bolts connecting the driveshaft to the transmission and differential.

  • 1. Identify the correct bolt size and torque specification for your vehicle. Consult a repair manual for these values.
  • 2. Clean the threads of the bolts and the threaded holes. Use a wire brush if necessary.
  • 3. Install the bolts finger tight, then snug them with a standard wrench.
  • 4. Use the appropriate torque wrench and tighten the bolts to the specified torque in a star pattern.
  • 5. Re-check the torque after a short test drive.
View full procedure

Transmission Mounting Bolt Torque Procedure

This procedure details how to correctly torque the bolts that secure the transmission to the vehicle's frame.

  • 1. Identify the correct bolt size and torque specification for your vehicle. Consult a repair manual for these values.
  • 2. Clean the threads of the bolts and the threaded holes.
  • 3. Install the bolts finger tight, then snug them evenly.
  • 4. Use the appropriate torque wrench and tighten the bolts to the specified torque in the correct sequence.
  • 5. Verify proper torque after initial drive
View full procedure

Differential Mounting Bolt Torque Procedure

This procedure details how to correctly torque the bolts that secure the differential to the vehicle's subframe.

  • 1. Identify the correct bolt size and torque specification for your vehicle. Consult a repair manual for these values.
  • 2. Clean the threads of the bolts and the threaded holes. Inspect for any signs of damage.
  • 3. Install the bolts finger tight and then snug them evenly.
  • 4. Using the appropriate torque wrench, tighten bolts to the specified torque, typically in a cross-pattern or sequence.
  • 5. Check the bolts after a short test drive to ensure proper torque.
View full procedure
Technical Service Bulletins

Driveshaft Bolt Loosening Issue

2011-05-15

Some 2008-2010 models have experienced driveshaft bolt loosening due to improper initial torque.

2008-2010 BMW 750i

Resolution: Apply thread locking compound (e.g., Loctite) and re-torque to revised specification. Consult a service manual for updated torque specs.

Transmission Mount Bolt Update

2013-02-28

Revised transmission mount bolt torque specifications for increased durability and reduced vibrations in the drivetrain.

2008-2015 BMW 750i

Resolution: Torque transmission mount bolts to the new specification outlined in the updated service manual.

Differential Bolt Inspection Advisory

2014-11-10

Advisory for inspection of differential mounting bolts for signs of fatigue or wear.

2008-2015 BMW 750i

Resolution: Inspect differential bolts for stretching or damage, replace if necessary and re-torque to specification. Consult a service manual for bolt replacement instructions.

About the Author

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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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