BMW 340i 2005-2011 Drivetrain Bolt Torque Specifications & Fastener Values
BMW 340i 2005-2011

BMW 340i 2005-2011 Drivetrain Bolt Torque Specifications

This page provides detailed torque specifications for various bolts within the drivetrain system of the 2005-2011 BMW 3 Series (E90, E91, E92, E93) models. Includes information for the transmission, driveshaft, differential and axles.

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

This section covers the bolts that connect the engine to the transmission, ensuring proper alignment and power transfer.

1

Flywheel Bolts

M12 x 1.5
Torque Value
55 ft-lbs (74 N·m)
Important Notes
Apply thread locker. Ensure flywheel is properly aligned before torquing. Tighten bolts in a star pattern for even clamping.
2

Transmission Bellhousing Bolts to Engine Block

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
These bolts secure the bellhousing to the engine block. Tighten in a criss-cross pattern to ensure even clamping.

Transmission Mounting

This section includes bolts that secure the transmission to the chassis and related components.

1

Transmission Mounting Bolts

M12 x 1.75
Torque Value
41 ft-lbs (55 N·m)
Important Notes
These bolts secure the transmission to the vehicle's frame or crossmember.
2

Transmission Oil Pan Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Tighten these bolts in a criss-cross pattern to ensure even seal compression. Do not overtighten to avoid gasket damage or leaks.
3

Transmission Drain and Fill Plugs

M18 x 1.5
Torque Value
30 ft-lbs (41 N·m)
Important Notes
Use new sealing washers. Do not overtighten.

Driveshaft And Axles

This section covers the fasteners related to the driveshaft, output flanges and axle shafts.

1

Propeller/Drive Shaft Bolts

M10 x 1.25
Torque Value
37 ft-lbs (50 N·m)
Important Notes
These bolts connect the driveshaft to the transmission and differential flanges. Tighten in a star pattern.
2

Output Flange Bolts on Transmission

M10 x 1.5
Torque Value
59 ft-lbs (80 N·m)
Important Notes
These bolts secure the output flange to the transmission. Tighten bolts evenly in a star pattern.
3

Drive Axle/Half Shaft Bolts

M10 x 1.5
Torque Value
59 ft-lbs (80 N·m)
Important Notes
These bolts connect the drive axles to the transmission and wheel hubs. Tighten in a star pattern. Check for proper axle seating.
4

CV Joint/Axle Nut

M24 x 1.5
Torque Value
214 ft-lbs (290 N·m)
Important Notes
This nut secures the outer end of the drive axle to the wheel hub. May require a new nut each time. Correct torque is essential for bearing preload. Verify proper torque with vehicle on the ground.
5

Driveshaft Center Support Bearing Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
These bolts attach the center support bearing bracket to the chassis. Do not overtighten.

Differential

This section includes all fasteners related to the differential including mounting and fluid maintenance.

1

Differential Mounting Bolts

M12 x 1.75
Torque Value
81 ft-lbs (110 N·m)
Important Notes
These bolts secure the differential to the subframe or chassis. Tighten in a criss-cross pattern.
2

Differential Drain/Fill Plug

M18 x 1.5
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Use new sealing washers. Do not overtighten.

Transfer Case

This section includes fasteners specific to the transfer case for all-wheel-drive models.

1

Transfer Case Drain/Fill Plug

M18 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Use new sealing washers. Do not overtighten. Apply thread sealant if required.

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?

Proper torque ensures the bolts are tightened to the correct tension, preventing them from loosening under stress and vibration. Under-tightening can lead to component failure, while over-tightening can stretch or break bolts, damaging threads, or leading to catastrophic failures like a driveshaft coming loose. For example, improperly torqued driveshaft bolts could lead to the driveshaft separating at speed.

Q2

What happens if I over-torque a drivetrain bolt?

Over-torquing can permanently damage the bolt, the threads in the component it's attached to, or both. It can cause the bolt to stretch, weaken, and become prone to failure later. You might also damage the sealing surfaces if present, causing leaks. Imagine over-tightening a transmission output flange bolt and cracking the flange - now you have to replace the flange.

Q3

Can I reuse all drivetrain bolts?

While some bolts can be reused, many drivetrain bolts are designed for single use, especially those used in critical areas like the driveshaft or differential. These bolts are often stretch bolts or are pre-treated and may lose their clamping force if reused. Always refer to the BMW repair manual or TIS (Technical Information System) for specific guidance. Failing to replace one-time use bolts could cause the connection to come loose.

Q4

Do I need to use threadlocker on drivetrain bolts?

Threadlocker, such as Loctite, is sometimes required for specific drivetrain bolts to prevent them from loosening due to vibration. Always refer to the BMW repair manual or TIS to know when threadlocker is required and the correct type. Using it when not needed may make future removal very difficult. The use of threadlocker is especially common on bolts connecting the driveshaft to the transmission or differential.

Q5

Where can I find the correct torque specifications for my BMW 340i (2005-2011) drivetrain?

The most reliable sources for torque specifications are the official BMW repair manuals (specific to your model year), the BMW TIS (Technical Information System), and reputable online databases specifically for automotive repair. Some third party repair guides can be helpful but always cross reference with a BMW official source. Never rely on internet forum posts as a sole source of information.

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 is essential for applying the correct torque to drivetrain bolts.

  • Wide torque range (e.g., 20-150 ft-lbs)
  • Audible click or digital display
  • Accurate and repeatable readings
Learn more

Torque Wrench (3/8" Drive)

A smaller torque wrench for lower torque applications on the drivetrain.

  • Smaller torque range (e.g., 5-80 ft-lbs)
  • Precise measurements for smaller fasteners
  • Easy to handle in tight spaces
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets in various sizes to fit all drivetrain bolts.

  • Includes standard and deep sockets
  • Durable construction (e.g., chrome vanadium steel)
  • Variety of drive sizes (e.g., 1/2", 3/8")
Learn more

Socket Extensions

Used to access recessed or hard-to-reach drivetrain bolts.

  • Varying lengths for different applications
  • Durable and sturdy construction
  • Securely connects to sockets and ratchets
Learn more

Universal Joint Adapter

Allows for socket access at an angle.

  • Allows for angled socket access
  • Durable construction for torque application
  • Secure connection to sockets and extensions
Learn more

Breaker Bar

Used to loosen extremely tight bolts before applying torque with the torque wrench.

  • Provides high leverage for breaking stubborn bolts
  • Durable construction to withstand high force
  • Long handle for improved mechanical advantage
Learn more

Thread Locking Compound (e.g., Loctite)

Thread locking compound is necessary for bolts that are subject to vibration.

  • Prevents bolts from loosening due to vibration
  • Available in different strengths (e.g., blue for medium strength)
  • Ensures fasteners stay tight and secure
Learn more
Service Procedures

Driveshaft Bolt Torque Procedure

This procedure outlines how to correctly torque the bolts connecting the driveshaft to the transmission and differential on a 2005-2011 BMW 340I.

  • Identify all driveshaft bolts that need to be torqued. Clean any debris from the threads.
  • Apply a light coating of thread locking compound (if specified by manufacturer) to the threads of each bolt.
  • Using the correct size socket, hand-tighten all the driveshaft bolts.
  • Using a torque wrench set to the manufacturer's specified torque specification for these fasteners, tighten the bolts in a star pattern, to ensure even pressure.
  • Double-check all bolts with the torque wrench to confirm correct torque.
View full procedure

Differential Mounting Bolt Torque Procedure

This procedure outlines the proper way to tighten the differential mounting bolts.

  • Identify the differential mounting bolts.
  • Clean the threads of all bolts, making sure there is no debris or grime.
  • Install the bolts and tighten them by hand to begin with.
  • Using a torque wrench set to the manufacturer's specified torque specification for these fasteners, tighten the bolts in a cross pattern.
  • Double-check all bolts with the torque wrench to confirm correct torque.
View full procedure

Axle Shaft Bolt Torque Procedure

This procedure outlines the proper way to tighten the axle shaft bolts

  • Identify the axle shaft bolts.
  • Clean the threads of all bolts, making sure there is no debris or grime.
  • Install the bolts and tighten them by hand to begin with.
  • Using a torque wrench set to the manufacturer's specified torque specification for these fasteners, tighten the bolts in a star pattern.
  • Double-check all bolts with the torque wrench to confirm correct torque.
View full procedure
Technical Service Bulletins

Driveshaft Bolt Loosening Issue

2008-05-15

Some 2005-2008 BMW 3-series vehicles may experience loosening of the driveshaft bolts due to improper torque during manufacturing.

2005-2008

Resolution: Inspect and re-torque all driveshaft bolts to the manufacturer's specifications. Apply new thread locking compound, if necessary, to ensure proper torque and retention.

Differential Mounting Bolt Failure

2009-11-20

Reports have surfaced of differential mounting bolts failing, due to fatigue or improper torque. This affects all 2005-2011 3-series vehicles.

2005-2011

Resolution: Inspect all differential mounting bolts for signs of wear or damage. If any damage is present, replace the bolts. Ensure all bolts are torqued to the manufacturers specifications.

Axle Bolt Loosening

2010-03-10

Some 2008-2011 3-series vehicles have reported loosened axle bolts after continued use.

2008-2011

Resolution: Inspect all axle bolts and ensure they are torqued to the manufacturer's specifications. Apply new thread locking compound to the threads of each bolt and re-torque.

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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