BMW 745i 2002-2009 Drivetrain Bolt Torque Specifications & Fastener Values
BMW 745i 2002-2009

BMW 745i 2002-2009 Drivetrain Bolt Torque Specifications

Comprehensive list of drivetrain bolt torque specifications for the 2002-2009 BMW 745i (E65/E66 chassis), including transmission, driveshaft, differential, and axle components. Ensure proper torque application for safe and reliable operation.

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

Specifications for securing the flywheel to the engine crankshaft, ensuring proper power transfer and engine balance.

1

Flywheel Bolts

M12 x 1.5
Torque Value
85 ft-lbs (115 N·m)
Important Notes
Use a criss-cross pattern for tightening. Apply a small amount of threadlocker.

Transmission Mounting

Specifications for securing the transmission to the engine block or chassis.

1

Transmission Mounting Bolts

M10 x 1.5
Torque Value
30 ft-lbs (41 N·m)
Important Notes
Apply even pressure when tightening, use new bolts if possible.

Transmission Components

Specifications for various components within the transmission system.

1

Transmission Oil Pan Bolts

M6 x 1.0
Torque Value
11 ft-lbs (15 N·m)
Important Notes
Use a criss-cross pattern to prevent warping. Use a new gasket or sealant.
2

Transmission Drain and Fill Plugs

M22 x 1.5
Torque Value
30 ft-lbs (41 N·m)
Important Notes
Use a new sealing washer. Do not overtighten.
3

Transmission Output Shaft Flange Nut

M24 x 1.5
Torque Value
120 ft-lbs (163 N·m)
Important Notes
This is an estimated value. Verify with the factory service manual. Ensure proper alignment.

Driveshaft And Axles

Specifications for components of the driveshaft and axle assembly.

1

Drive Axle/Half Shaft Bolts

M10 x 1.25
Torque Value
59 ft-lbs (80 N·m)
Important Notes
Check bolt type and size as specifications vary.
2

CV Joint/Axle Nut

M24 x 1.5
Torque Value
180 ft-lbs (244 N·m)
Important Notes
This nut is often a single use item. Replace if it is being removed.
3

Propeller/Drive Shaft Bolts

M12 x 1.25
Torque Value
80 ft-lbs (108 N·m)
Important Notes
Use a criss-cross pattern. Ensure proper alignment before tightening.
4

Driveshaft Center Support Bearing Mounting Bolts

M8 x 1.25
Torque Value
25 ft-lbs (34 N·m)
Important Notes
This is an estimated value. Ensure the bearing is properly aligned before tightening.
5

Guibo (Flex Disc) Bolts

M10 x 1.5
Torque Value
40 ft-lbs (54 N·m)
Important Notes
This is an estimated value. Use a criss-cross pattern for tightening.

Differential

Specifications for the differential assembly and its components.

1

Differential Drain/Fill Plug

M18 x 1.5
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Use a new sealing washer.
2

Differential Housing Mounting Bolts

M12 x 1.75
Torque Value
70 ft-lbs (95 N·m)
Important Notes
This is an estimated value. Use a criss-cross pattern for tightening.

Transfer Case

Specifications for the transfer case (if applicable) components.

1

Transfer Case Drain/Fill Plug

M18 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Use a new sealing washer.

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 is crucial for proper clamping force, preventing bolts from loosening due to vibration or fatigue. Over-torquing can stretch or break bolts, damage threads, or deform components. Under-torquing can lead to parts shifting, loosening, or premature failure. In the drivetrain, this can cause serious issues like driveline vibration, component failure, and potential loss of control.

Q2

What happens if I over-torque a drivetrain bolt?

Over-torquing a drivetrain bolt can lead to several issues. It can stretch or yield the bolt beyond its designed elasticity, permanently weakening it. It can also damage threads in the mating components, making future repairs difficult or impossible. In severe cases, over-torquing can lead to bolt failure, component distortion, or even cracks in the housing, requiring significant repairs. For example, over-torquing a transmission output flange bolt can damage the flange or even the transmission casing.

Q3

Can I reuse drivetrain bolts?

Generally, it's recommended to replace drivetrain bolts, especially those that are torque-to-yield (TTY) bolts. TTY bolts are designed to stretch upon tightening and are not meant for reuse. Even non-TTY bolts can be compromised from previous use through stretching or thread wear. Reusing bolts, especially on crucial drivetrain components, increases the risk of failure. It’s best to consult the repair manual for specific guidance, but when in doubt, use new bolts.

Q4

What tools do I need to properly torque drivetrain bolts?

You will need a calibrated torque wrench, sockets of the correct size, and potentially extensions or adapters to access the bolts. Always ensure your torque wrench is within its calibration period for accurate readings. For difficult to reach areas, consider using crowfoot wrenches for proper torque application. Avoid using impact wrenches for final torquing as they lack the necessary accuracy.

Q5

Where can I find the specific torque specifications for my 2002-2009 BMW 745i drivetrain components?

The most accurate place to find the correct torque specifications is within the official BMW repair manual (Bentley manual is often recommended for BMW vehicles), specific to your vehicle's model year. Other reputable sources may include online repair databases like alldatadiy or Mitchell on demand, as well as OEM parts catalogs sometimes offer exploded views with bolt torque info. Always double-check that you have the specifications for your exact component before tightening any bolts. Do NOT rely solely on forums or internet information of unknown accuracy.

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" Drive)

A calibrated torque wrench capable of measuring torque values within the required range for drivetrain fasteners.

  • Click-type mechanism for accurate readings
  • Wide torque range (e.g., 20-200 ft-lbs)
  • Clearly marked scale for easy adjustment
Learn more

Torque Wrench (3/8" Drive)

A smaller torque wrench for lower torque fasteners in the drivetrain system.

  • Click-type mechanism for accurate readings
  • Smaller torque range (e.g., 5-80 ft-lbs)
  • Suitable for smaller fasteners
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets in 1/2" and 3/8" drive sizes to fit various drivetrain fasteners.

  • Variety of sizes ranging from 8mm to 24mm
  • 6-point design for secure grip
  • Impact resistant construction
Learn more

Socket Extension Set

A set of socket extensions of various lengths to access recessed fasteners in the drivetrain.

  • Variety of lengths (e.g., 3", 6", 10")
  • Strong chrome vanadium construction
  • Provides additional reach
Learn more

Universal Joint Adapter

A universal joint adapter to enable torque application at an angle, when necessary.

  • Allows for angled torque application
  • Durable steel construction
  • Compatible with socket sizes
Learn more
Service Procedures

Driveshaft to Transmission Flange Bolt Torque

Procedure for torquing the bolts securing the driveshaft to the transmission flange on a 2002-2009 BMW 745i.

  • Identify the driveshaft to transmission flange bolts.
  • Clean the bolt threads and mating surfaces.
  • Using the appropriate socket, hand-tighten each bolt.
  • Set the torque wrench to the specified value (refer to service manual).
  • Torque each bolt to the specified value in a star pattern to ensure even pressure.
  • Verify the torque on each bolt again to ensure proper tightening.
View full procedure

Driveshaft to Differential Flange Bolt Torque

Procedure for torquing the bolts securing the driveshaft to the differential flange on a 2002-2009 BMW 745i.

  • Identify the driveshaft to differential flange bolts.
  • Clean the bolt threads and mating surfaces.
  • Using the appropriate socket, hand-tighten each bolt.
  • Set the torque wrench to the specified value (refer to service manual).
  • Torque each bolt to the specified value in a star pattern to ensure even pressure.
  • Verify the torque on each bolt again to ensure proper tightening.
View full procedure

Differential Mounting Bolt Torque

Procedure for torquing the bolts securing the differential to the chassis on a 2002-2009 BMW 745i.

  • Identify the differential mounting bolts.
  • Clean the bolt threads and mating surfaces.
  • Using the appropriate socket, hand-tighten each bolt.
  • Set the torque wrench to the specified value (refer to service manual).
  • Torque each bolt to the specified value. Some may require multiple torque stages.
  • Verify the torque on each bolt again to ensure proper tightening.
View full procedure

Wheel Lug Bolt Torque

Procedure for torquing the wheel lug bolts to the correct specification.

  • Ensure the wheel is properly seated against the hub.
  • Hand-tighten each lug bolt.
  • Set the torque wrench to the specified value (refer to service manual).
  • Torque each lug bolt to the specified value in a star pattern to ensure even pressure.
  • Verify the torque on each lug bolt again to ensure proper tightening.
View full procedure
Technical Service Bulletins

Driveshaft Bolt Loosening and Vibration

2006-03-15

Some 2002-2006 745i models have experienced driveshaft bolt loosening, leading to vibrations and potential damage. Incorrect torque application during assembly may be the cause.

2002-2006

Resolution: Verify driveshaft bolt torque to manufacturer specifications using a calibrated torque wrench. Re-torque bolts after 100 miles of driving.

Differential Mounting Bolt Issues

2007-09-20

Certain 2004-2007 models have shown differential mounting bolts loosening over time, potentially causing noise and alignment issues. This can be due to improper torque or bolt stretching.

2004-2007

Resolution: Inspect differential mounting bolts for any signs of stretching or damage, replace as needed. Apply the proper torque specification to the mounting bolts. Use new bolts when necessary.

About the Author

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Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

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