BMW 435i 2014-2016 Drivetrain Bolt Torque Specifications & Fastener Values
BMW 435i 2014-2016

BMW 435i 2014-2016 Drivetrain Bolt Torque Specifications

This page provides detailed torque specifications for various drivetrain bolts on the 2014-2016 BMW 435i, including the driveshaft, differential, and axle 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 To Transmission

Specifications for bolts connecting the engine and transmission, including flywheel/flexplate, bellhousing, and starter motor.

1

Flywheel Bolts

M10 x 1.25
Torque Value
60 ft-lbs (81 N·m)
Important Notes
Ensure flywheel and crankshaft mating surfaces are clean and free of debris. Always use new bolts.
2

Flex Plate Bolts (Automatic Transmission)

M10 x 1.25
Torque Value
60 ft-lbs (81 N·m)
Important Notes
Ensure flex plate and crankshaft mating surfaces are clean and free of debris. Always use new bolts.
3

Transmission Bellhousing Bolts to Engine Block

M10 x 1.5
Torque Value
40 ft-lbs (54 N·m)
Important Notes
Tighten bolts in a criss-cross pattern to ensure even clamping. Ensure proper alignment of transmission and engine before final torque.
4

Starter Motor Mounting Bolts

M10 x 1.5
Torque Value
30 ft-lbs (41 N·m)
Important Notes
Ensure starter motor is properly seated against the engine block. Check for proper engagement with flywheel/flexplate before final torque.

Transmission

Torque specifications for mounting and internal components of the transmission.

1

Transmission Mounting Bolts

M12 x 1.75
Torque Value
40 ft-lbs (54 N·m)
Important Notes
Tighten bolts in a criss-cross pattern to ensure even clamping and proper alignment. Ensure transmission is fully seated on mounts before tightening.
2

Transmission Oil Pan Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Tighten bolts in a criss-cross pattern to ensure even gasket compression and sealing. Do not overtighten.
3

Transmission Fluid Drain/Fill Plugs

M18 x 1.5
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Use new sealing washers on drain and fill plugs. Do not over tighten.

Driveshaft

Torque specifications for components of the driveshaft, including center support bearing, drive shaft bolts, and output flange nuts.

1

Center Support Bearing Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Ensure the center support bearing is properly aligned before tightening bolts. Do not over tighten these smaller bolts.
2

Propeller/Drive Shaft Bolts

M10 x 1.5
Torque Value
80 ft-lbs (108 N·m)
Important Notes
Tighten bolts in a criss-cross pattern. Check driveshaft alignment and proper flange contact before final torque.
3

Output Flange Nut (Differential or Transmission)

M20 x 1.5
Torque Value
111 ft-lbs (150 N·m)
Important Notes
This nut requires a high torque for secure fastening. Consult service manual for any specific variations.

Axles And Differential

Torque specifications for components related to the axles, differential, and final drive.

1

Drive Axle/Half Shaft Bolts

M10 x 1.25
Torque Value
70 ft-lbs (95 N·m)
Important Notes
These bolts secure the CV joint flanges to the transmission or differential and wheel hubs. Ensure proper alignment of CV joints before final torque.
2

CV Joint/Axle Nut

M24 x 1.5
Torque Value
185 ft-lbs (251 N·m)
Important Notes
This nut secures the CV joint to the wheel hub and has a high torque specification. Verify threads are clean and undamaged before installation. Always use a new nut when required.
3

Differential Mounting Bolts

M12 x 1.75
Torque Value
70 ft-lbs (95 N·m)
Important Notes
Tighten bolts in a criss-cross pattern. Ensure proper alignment of the differential before final torque. Ensure the differential is seated properly against its mounts before tightening.
4

Differential Drain/Fill Plug

M18 x 1.5
Torque Value
30 ft-lbs (41 N·m)
Important Notes
Use a new sealing washer. Do not over tighten.

Transfer Case

Torque specifications for components related to the transfer case (if vehicle is equipped).

1

Transfer Case Drain/Fill Plug

M18 x 1.5
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Use a new sealing washer. Do not over tighten.

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 to ensure proper clamping force, preventing bolts from loosening due to vibration or stress, which could lead to component failure, damage, or even accidents. Over-tightening can damage threads or the component itself, while under-tightening can allow parts to move and cause significant issues. For example, improperly torqued driveshaft bolts could lead to severe vibrations or complete driveshaft separation.

Q2

What should I do if I don't have the exact torque wrench specified in the service manual?

While a precise torque wrench is always recommended, you can use an equivalent wrench with comparable accuracy. However, always double-check the calibration and settings. Never rely on 'feel'; use a calibrated tool whenever possible. If a torque specification calls for Nm and you only have a foot-pound wrench, convert the values using the appropriate conversion factor. If the wrench is not the correct type for a specific application, consult a professional to perform the task.

Q3

How often should I check drivetrain bolt torque?

Drivetrain components, especially those subject to high stresses, such as driveshaft and differential bolts, should be checked periodically. A good practice is to check them during routine maintenance intervals (e.g., every oil change or at least annually), particularly after any recent work involving these parts. If you drive aggressively, check more frequently. For example, after a track day or spirited driving, checking the rear differential mounting bolts is wise.

Q4

Can I reuse drivetrain bolts?

Some drivetrain bolts, especially those that are torque-to-yield (TTY) or one-time use bolts, should NOT be reused. Always consult the BMW service manual for specific guidance. TTY bolts stretch when torqued and lose their clamping force if reused. Ignoring this could lead to severe damage. For example, differential mounting bolts are often TTY and must be replaced after removal.

Q5

What happens if a drivetrain bolt breaks during removal or installation?

If a bolt breaks, it must be carefully extracted using appropriate methods to avoid further damage to the component or threads. If the broken bolt is embedded in the housing, it may require professional assistance or specialized tools to remove. Always use penetrating oil for removal when necessary, and never force a bolt that does not want to come out easily.

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 high-quality torque wrench is essential for applying precise torque to drivetrain bolts.

  • Click-type mechanism for accurate readings
  • Wide torque range (e.g., 20-200 Nm)
Learn more

Torque Wrench (3/8" Drive)

A smaller torque wrench for smaller fasteners and tighter spaces.

  • Click-type mechanism for accurate readings
  • Smaller torque range (e.g., 5-80 Nm)
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets in various sizes.

  • Variety of sizes to fit all drivetrain bolts
  • Typically 6-point for secure grip
Learn more

Extension Bars

Extension bars of various lengths help reach difficult to access bolts.

  • Assorted length options
  • Secure attachment to sockets and torque wrench
Learn more

Universal Joint

A universal joint can add more degrees of freedom to difficult to access bolts.

  • Allows angled socket application
  • Durable construction
Learn more
Service Procedures

Driveshaft Bolt Torque Procedure

Procedure for torquing driveshaft bolts to the specified value.

  • Locate the driveshaft bolts connecting it to the transmission or differential.
  • Clean any dirt or debris from the bolt head and surrounding areas.
  • Apply a small amount of anti-seize to the bolt threads, if necessary.
  • Using the appropriate socket and torque wrench, tighten the bolts to the specified torque (refer to specifications).
  • Tighten all bolts in a star or cross pattern to ensure even pressure.
  • Recheck torque settings after driving for 100 miles.
View full procedure

Differential Mounting Bolt Torque Procedure

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

  • Locate the differential mounting bolts.
  • Clean any dirt or debris from the bolt head and surrounding areas.
  • Apply a small amount of anti-seize to the bolt threads, if necessary.
  • Using the correct size socket and torque wrench, tighten all bolts to the specified torque value.
  • Tighten bolts in a specific cross pattern, generally recommended by the manufacturer to ensure proper sealing.
  • Recheck torque settings after driving for 100 miles.
View full procedure

Transmission Mount Bolt Torque Procedure

Procedure for torquing transmission mount bolts.

  • Locate all transmission mount bolts.
  • Clean any dirt or debris from the bolt head and surrounding areas.
  • Apply a small amount of anti-seize to the bolt threads, if necessary.
  • Using the correct size socket and torque wrench, tighten all bolts to the specified torque value.
  • Tighten bolts in a specific pattern as recommended to ensure proper mount alignment.
  • Recheck torque settings after driving for 100 miles.
View full procedure
Technical Service Bulletins

Driveshaft Bolt Loosening Issue

2015-05-15

Some 2014-2015 models have reported driveshaft bolt loosening. This can cause vibration and potentially damage surrounding components.

2014-2015 435i

Resolution: Replace driveshaft bolts with updated fasteners and apply the correct torque plus angle tightening procedure. Recheck torque after 1000 miles.

Differential Mounting Bolt Fatigue

2016-01-20

Some 2015-2016 435i models may experience fatigue and eventual failure of differential mounting bolts due to high performance driving.

2015-2016 435i

Resolution: Inspect differential mount bolts for signs of fatigue or deformation. Replace if necessary. Use new bolts and apply the correct torque. Retorque bolts after 500 miles.

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