BMW 740i 2016-present Drivetrain Bolt Torque Specifications & Fastener Values
BMW 740i 2016-present

BMW 740i 2016-present Drivetrain Bolt Torque Specifications

This page provides detailed torque specifications for all drivetrain related bolts on the 2016-Present BMW 740i (G11/G12) including 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 torque specifications for components connecting the engine to the transmission, ensuring proper power transfer.

1

Flywheel Bolts

M12 x 1.5
Torque Value
60 ft-lbs (81 N·m)
Important Notes
Apply torque in a star pattern. Inspect bolts for stretch, replace if necessary.
2

Flex Plate Bolts (Automatic Transmissions)

M12 x 1.5
Important Notes
Torque-to-yield bolts. Replace after each use. Apply torque in a star pattern. Final tightening requires an angle torque.
3

Transmission Mounting Bolts

M12 x 1.75
Torque Value
45 ft-lbs (61 N·m)
Important Notes
Ensure transmission is properly aligned before tightening. Use a torque wrench for accurate setting.

Transmission Components

Torque specifications for bolts related to the transmission itself.

1

Transmission Oil Pan Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Tighten evenly in a cross pattern. Do not overtighten, as it can damage the gasket. Use a new gasket with installation.
2

Transmission Drain and Fill Plugs

M18 x 1.5
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Use a new sealing washer with installation. Do not overtighten, as it can damage the transmission casing.

Axles And Differentials

Specifications for bolts related to the axles, differentials, and related components.

1

Drive Axle/Half Shaft Bolts

M10 x 1.5
Torque Value
80 ft-lbs (108 N·m)
Important Notes
Ensure bolts are properly seated. Use a torque wrench for accurate settings.
2

CV Joint/Axle Nut

M24 x 1.5
Torque Value
170 ft-lbs (230 N·m)
Important Notes
Tighten to the high value for proper bearing preload. Always use a new nut.
3

Differential Mounting Bolts

M14 x 2.0
Torque Value
65 ft-lbs (88 N·m)
Important Notes
Tighten evenly to the subframe or chassis. Check differential alignment prior to tightening.
4

Differential Drain/Fill Plug

M18 x 1.5
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Use new sealing washer. Do not over tighten. Ensure correct fill level when completed.

Transfer Case Components

Torque specifications for components related to the transfer case on AWD models.

1

Transfer Case Mounting Bolts

M12 x 1.75
Torque Value
55 ft-lbs (75 N·m)
Important Notes
Tighten evenly and securely to the transmission and chassis. Check alignment before final tightening.
2

Transfer Case Drain/Fill Plug

M18 x 1.5
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Use new sealing washer. Do not over tighten. Ensure correct fill level when completed.

Wheel Hub Components

Specifications for the critical wheel hub to knuckle mounting.

1

Wheel Hub to Knuckle Bolts

M12 x 1.75
Torque Value
105 ft-lbs (142 N·m)
Important Notes
Tighten securely and evenly for proper wheel alignment.

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 is using the correct torque specification important?

Using the correct torque specification for drivetrain bolts is crucial to ensure proper clamping force. Under-tightening can lead to bolts loosening, causing vibrations, damage, or even component failure. Over-tightening can stretch or break bolts, damage threads, and potentially compromise the structural integrity of the drivetrain components. Correct torque ensures optimal performance and safety.

Q2

What tool do I need to properly torque drivetrain bolts?

You'll need a calibrated torque wrench with a suitable range for the specific bolts you're working with. For most drivetrain components, a 1/2-inch drive torque wrench is recommended. Using an impact wrench or tightening 'by feel' is highly discouraged as it can lead to inaccurate torque application. Always check your torque wrench's calibration regularly.

Q3

Should I use thread locker on drivetrain bolts?

Whether you should use a thread locker (like Loctite) depends on the specific bolt and BMW's recommendations. Generally, drivetrain components that experience significant vibration or shear forces benefit from thread locker. Always consult the BMW service manual for the correct type of thread locker and application procedure. For example, driveshaft bolts often require a medium-strength thread locker.

Q4

How often should I inspect the drivetrain components and their bolts?

It's generally recommended to inspect the drivetrain components, including bolts, during routine maintenance, such as oil changes or tire rotations, ideally every 6,000 to 10,000 miles or annually, whichever comes first. Look for any signs of looseness, corrosion, or damage. If you notice unusual noises, vibrations, or shifting issues, inspect immediately. A detailed inspection is also advised after any severe driving event.

Q5

What do I do if a bolt is seized or stripped?

If a bolt is seized, try using a penetrating lubricant and allowing it to soak in. If it's still seized, you may need to use heat to expand the material. If a bolt is stripped, you will need to repair the threads (with a tap and die set or thread repair kit) or replace the component. Do not force the bolt if it is seized or stripped as this can cause more damage. If you are not comfortable with these procedures consult a professional.

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 precise torque to drivetrain fasteners.

  • Click-type mechanism for accurate torque settings
  • 1/2" drive for common socket sizes
  • Range of 10-250 ft-lbs
Learn more

Torque Wrench (3/8" Drive)

A smaller torque wrench for lower torque applications on the drivetrain

  • Click-type mechanism for accurate torque settings
  • 3/8" drive for smaller fasteners
  • Range of 5-80 ft-lbs
Learn more

Socket Set (Metric)

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

  • Variety of sizes from 8mm to 24mm
  • Both standard and deep sockets
  • 6-point design for secure grip
Learn more

Torx Socket Set

Torx sockets to fit any Torx head bolts.

  • Variety of sizes from T20 to T60
  • Both standard and tamper proof
  • Durable design for high torque application
Learn more

Extension Bars

Extension bars of various lengths for reaching difficult-to-access fasteners.

  • 3", 6", and 10" lengths
  • 1/2" and 3/8" drive options
  • Durable construction
Learn more
Service Procedures

Driveshaft to Differential Flange Bolt Tightening

Procedure for tightening the bolts connecting the driveshaft to the differential flange.

  • Clean all threads and mating surfaces.
  • Install bolts loosely by hand.
  • Tighten bolts to 85 Nm (63 ft-lbs) in a star pattern
  • Perform a final check of all bolts.
View full procedure

Differential Mounting Bolt Tightening

Procedure for tightening the bolts securing the differential to the chassis.

  • Clean all threads and mating surfaces.
  • Install bolts loosely by hand.
  • Tighten the bolts to the initial torque of 60 Nm (44 ft-lbs)
  • Tighten the bolts to the final torque of 100 Nm (74 ft-lbs)
  • Perform a final check of all bolts.
View full procedure

Wheel Hub Bolt Tightening

Procedure for tightening the bolts securing the wheel hub assembly.

  • Clean all threads and mating surfaces.
  • Install bolts loosely by hand.
  • Tighten bolts to the specified torque of 110 Nm (81 ft-lbs)
  • Perform a final check of all bolts.
View full procedure

Transmission Mounting Bolt Tightening

Procedure for tightening the transmission mounting bolts.

  • Clean all threads and mating surfaces.
  • Install bolts loosely by hand.
  • Tighten the bolts to the initial torque of 40 Nm (30 ft-lbs)
  • Tighten the bolts to the final torque of 75 Nm (55 ft-lbs)
  • Perform a final check of all bolts.
View full procedure
Technical Service Bulletins

Driveshaft Bolt Loosening Issue

2018-05-15

Some 2016-2018 models have experienced driveshaft bolt loosening due to improper factory torque. This bulletin recommends re-torqueing the driveshaft bolts.

2016-2018 740i

Resolution: Inspect and re-torque driveshaft bolts to 85 Nm (63 ft-lbs). Apply thread locker to bolts for additional security. Replace bolts that appear to have been over torqued.

Differential Mounting Bolt Noise

2020-08-22

Reports of clicking and popping from the differential mounts during low-speed acceleration. This bulletin focuses on proper bolt torque and mount integrity.

2018-2020 740i

Resolution: Inspect all differential mounting bolts. Re-torque bolts to the 100 Nm (74 ft-lbs). Replace mounts if found to be cracked or broken.

About the Author

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Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

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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.
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