BMW 428i 2014-2016 Drivetrain Bolt Torque Specifications & Fastener Values
BMW 428i 2014-2016

BMW 428i 2014-2016 Drivetrain Bolt Torque Specifications

Detailed torque specifications for various bolts within the drivetrain of the 2014-2016 BMW 428i, including the driveshaft, differential, and transmission 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

Flywheel

Specifications for securing the flywheel to the crankshaft. The flywheel is a critical component that transfers the engine's rotational power to the transmission input shaft.

1

Flywheel Bolts

M12 x 1.5
Torque Value
88 ft-lbs (120 N·m)
Important Notes
Ensure proper torque sequence to prevent uneven clamping.

Transmission Mounting

Specifications for securing the transmission to the engine block and/or chassis. This connection transmits the power produced by the engine through the transmission.

1

Transmission Mounting Bolts

M12 x 1.75
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Tighten bolts evenly to ensure proper mounting.

Transmission Oil Pan

Specifications for securing the transmission oil pan to the transmission housing. Proper torque is critical to prevent leaks.

1

Transmission Oil Pan Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten bolts in a cross pattern to ensure even sealing. May require new gasket.

Transmission Plugs

Specifications for sealing the access points for draining and filling the transmission fluid.

1

Transmission Drain and Fill Plugs

M22 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Use new sealing washers or o-rings. Do not over-tighten.

Drive Axles

Specifications for securing the drive axles to the transmission output flange or wheel hub. These components transfer power to the wheels.

1

Drive Axle/Half Shaft Bolts (Transmission Side)

M10 x 1.5
Torque Value
81 ft-lbs (110 N·m)
Important Notes
Ensure proper alignment of the axle during installation.
2

CV Joint/Axle Nut (Wheel Hub Side)

M24 x 1.5
Torque Value
184 ft-lbs (250 N·m)
Important Notes
Always use a new nut, and make certain it is torqued correctly.

Propeller Shaft

Specifications for connecting the driveshaft to the transmission output flange and the differential flange. The driveshaft transfers power to the differential.

1

Propeller/Drive Shaft Bolts (Transmission and Differential)

M10 x 1.5
Torque Value
81 ft-lbs (110 N·m)
Important Notes
Ensure proper alignment before tightening.

Differential

Specifications for mounting the differential to the chassis and for the differential drain and fill plugs.

1

Differential Mounting Bolts

M12 x 1.75
Torque Value
81 ft-lbs (110 N·m)
Important Notes
Ensure differential is properly aligned and supported prior to tightening bolts. These torque values are estimated, and should be confirmed against the specific service manual for your model.
2

Differential Drain/Fill Plug

M22 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Use new sealing washers or o-rings. Do not over-tighten.

Flex Disc

Specifications for securing the flex disc to the transmission and differential flanges. These components reduce drivetrain vibrations.

1

Flex Disc Bolts

M10 x 1.5
Torque Value
60 ft-lbs (80 N·m)
Important Notes
Use new bolts when replacing flex discs. These torque values are estimated, and should be confirmed against the specific service manual for your model.

Center Support Bearing

Specifications for securing the center support bearing to the chassis. This component supports the driveshaft in place.

1

Center Support Bearing Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure proper alignment of the bearing before tightening. These torque values are estimated, and should be confirmed against the specific service manual for your model.

Transfer Case

Specifications for mounting the transfer case to the chassis and for the transfer case output flange, applicable for vehicles equipped with xDrive (AWD).

1

Transfer Case Mounting Bolts

M12 x 1.75
Torque Value
81 ft-lbs (110 N·m)
Important Notes
These torque values are estimated, and should be confirmed against the specific service manual for your model.
2

Transfer Case Output Flange Bolts

M10 x 1.5
Torque Value
81 ft-lbs (110 N·m)
Important Notes
Ensure proper alignment of the flange before tightening. These torque values are estimated, and should be confirmed against the specific service manual for your model.

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 drivetrain bolts to ensure proper clamping force. Under-tightening can lead to bolts loosening and potential component failure, while over-tightening can stretch or break bolts, damage threads, or distort mating surfaces. Both scenarios can cause vibrations, noise, and eventually, costly repairs. Imagine a driveshaft bolt that’s not torqued correctly - it could shear, resulting in a complete loss of power and possibly dangerous situations.

Q2

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

While a torque wrench is highly recommended for precise tightening, you could potentially use a regular wrench and rely on 'feel', however, this is not accurate or recommended. Incorrect torquing can cause serious issues with your drivetrain, as described above. It is best to either buy or borrow a torque wrench for these specific repairs to be safe and ensure the correct specifications are met. Always err on the side of caution.

Q3

Can I reuse drivetrain bolts?

Generally, it is recommended to replace critical drivetrain bolts, especially those that are torque-to-yield (TTY) or have thread locking compound. Reusing TTY bolts can compromise their clamping force and increase the risk of failure. Using old bolts can result in inadequate torque readings and potential long-term issues. BMW often recommends replacing bolts, nuts and fasteners due to the critical nature of their function in the vehicle's drivetrain.

Q4

Where can I find the specific torque specifications for my 2014-2016 BMW 428i drivetrain?

The most reliable source for torque specifications is the official BMW repair manual or a reputable online database specifically for your model. These manuals provide detailed diagrams and torque values for each bolt within the drivetrain, including components like the driveshaft, differential, and transmission. Be aware that online databases may not always be accurate, so always cross reference the information. Check your local auto parts stores for repair manuals for your 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 accurate bolt tightening to prevent damage or loosening.

  • Click-type mechanism
  • Range of 20-200 ft-lbs (27-270 Nm)
  • Accurate to within +/- 3%
Learn more

Torque Wrench (3/8 inch drive)

A smaller torque wrench for smaller bolts in the drivetrain.

  • Click-type mechanism
  • Range of 5-80 ft-lbs (7-108 Nm)
  • Accurate to within +/- 3%
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets is needed to fit various drivetrain bolts.

  • 10mm to 24mm sizes
  • 6-point sockets recommended
  • Chrome vanadium steel
Learn more

Socket Extensions

Extensions of various lengths help to access difficult-to-reach bolts.

  • 3 inch, 6 inch, 10 inch lengths
  • 1/2 inch and 3/8 inch drive
  • Chrome vanadium steel
Learn more

Universal Joint

A universal joint allows for angled access to bolts that are difficult to get to straight on.

  • 1/2 inch and 3/8 inch drive
  • Chrome vanadium steel
Learn more
Service Procedures

Driveshaft to Differential Flange Bolt Tightening

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

  • Clean the threads of the bolts and the flange.
  • Install the bolts by hand, ensuring they are correctly seated.
  • Using the correct socket and torque wrench, tighten the bolts in a star pattern to the initial torque specification.
  • Check the torque setting of the wrench after each click.
  • Repeat the star pattern, tightening each bolt to the final torque specification.
View full procedure

Differential Mounting Bolt Tightening

Procedure for tightening the differential mounting bolts to the chassis.

  • Clean the threads of the bolts and the mounting points.
  • Install the bolts by hand, ensuring they are correctly seated.
  • Using the correct socket and torque wrench, tighten the bolts to the initial torque specification.
  • Check the torque setting of the wrench after each click.
  • Repeat the torque tightening sequence to the final specified torque.
  • Visually inspect the bolts and mounts for correct seating and tightness.
View full procedure

Transmission Output Flange Bolt Tightening

Procedure for tightening the bolts connecting the driveshaft to the transmission output flange.

  • Clean the threads of the bolts and the flange.
  • Install the bolts by hand, ensuring they are correctly seated.
  • Using the correct socket and torque wrench, tighten the bolts in a star pattern to the initial torque specification.
  • Check the torque setting of the wrench after each click.
  • Repeat the star pattern, tightening each bolt to the final torque specification.
View full procedure
Technical Service Bulletins

Incorrect Driveshaft Bolt Torque Can Cause Vibration

2015-03-15

Some vehicles have reported driveshaft vibration due to incorrect bolt tightening. Ensure proper torque specifications are followed.

2014-2016 BMW 428i

Resolution: Re-torque all driveshaft bolts to the specification. Replace bolts if they have been previously over-torqued.

Differential Mounting Bolt Loosening

2016-01-20

Some 2014-2016 models have reported differential mounting bolts loosening over time. This can cause noise and potential damage.

2014-2016 BMW 428i

Resolution: Inspect differential mount bolts for proper torque. If loose, tighten to specification and use threadlocker when reinstalling.

Transmission Output Flange Bolt Shear

2015-09-10

Reports of transmission output flange bolts shearing due to incorrect installation and torque specifications.

2014-2015 BMW 428i

Resolution: Always use new bolts and follow the specified torque and tightening procedure to prevent shearing. Visually inspect all bolts after tightening.

About the Author

Expert automotive knowledge and experience

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.

Facebook Contact
15+ Years
Experience
500+ Guides
Guides
50+ Makes
Vehicles
1000+ Solutions
Solutions

Diagnostic

Specialized in advanced diagnostic techniques using modern scan tools and oscilloscopes.

Repair

Expert in both traditional mechanical repairs and modern vehicle systems.

Additional Expertise

Documentation

Created over 500 detailed repair guides and technical documents.

Training

Conducted technical training sessions and contributed to repair databases.

Certifications & Research

Certifications

  • ASE Master Technician Certification
  • Advanced Diagnostic Specialist
  • Hybrid/Electric Vehicle Systems
  • Performance Tuning Expert

Research & Community

Actively researches emerging technologies and contributes to automotive forums.

Legal Disclaimer

Important information about using this content

Always refer to your vehicle's service manual and take appropriate safety precautions when performing any maintenance or repairs.

General Information
The information provided on this website is for general informational purposes only. While we strive to maintain accuracy in our content, all specifications, procedures, and technical information should be verified against your vehicle's official service manual or with the manufacturer directly.
Warranty & Liability

The content on this website is provided "as is" without any representations or warranties, express or implied. We make no representations or warranties regarding the accuracy, completeness, or availability of the information.

We shall not be liable for any direct, indirect, special, or consequential damages arising from the use of information on this website.

Technical Information
  • All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
  • Vehicle specifications and procedures may vary by model year, trim level, and region.
  • Always follow the manufacturer's recommended procedures and safety precautions.
  • Working on vehicles can be dangerous. Always take proper safety precautions and use appropriate safety equipment.
  • If you're unsure about any procedure, consult a qualified professional mechanic.
Intellectual Property
All content, including text, images, and specifications, is protected by copyright and other intellectual property laws. Any unauthorized use or reproduction is prohibited.

© 2025 BMW Specs. All rights reserved.

Privacy Policy Terms of Service