BMW X4 2014-2018 Drivetrain Bolt Torque Specifications & Fastener Values
BMW X4 2014-2018

BMW X4 2014-2018 Drivetrain Bolt Torque Specifications

Detailed torque specifications for bolts related to the drivetrain components of the 2014-2018 BMW X4 (F26) 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

Flywheel

This section covers the torque specifications for the flywheel and clutch components, which are crucial for proper power transmission from the engine to the transmission.

1

Flywheel Bolts

M12 x 1.5
Torque Value
55 ft-lbs (74 N·m)
Important Notes
Ensure flywheel mating surfaces are clean and free of debris. Use new bolts if specified by the manufacturer.
2

Clutch Pressure Plate Bolts

M8 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Tighten the bolts evenly in a star pattern to prevent distortion of the pressure plate. Ensure the clutch disc is properly aligned before tightening.

Transmission

This section details the torque specifications for mounting the transmission to the engine or chassis, as well as the plugs and bolts used for transmission service.

1

Transmission Mounting Bolts

M12 x 1.75
Torque Value
50 ft-lbs (68 N·m)
Important Notes
Ensure the transmission is properly aligned before tightening. Check for any signs of thread damage and replace bolts if necessary.
2

Transmission Oil Pan Bolts

M6 x 1.0
Torque Value
8.75 ft-lbs (12 N·m)
Important Notes
Use a new gasket and tighten in a criss-cross pattern to ensure an even seal. Do not over tighten.
3

Transmission Drain and Fill Plugs

M18 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Use a new sealing washer. Be careful not to overtighten the plugs, which could damage the threads.

Transfer Case

This section provides torque specifications for mounting and servicing the transfer case, important for all-wheel-drive models.

1

Transfer Case Mounting Bolts

M10 x 1.5
Torque Value
60 ft-lbs (81 N·m)
Important Notes
Ensure proper alignment before tightening. Verify bolt threads are in good condition.
2

Transfer Case Drain and Fill Plugs

M18 x 1.5
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Use a new sealing washer. Be careful not to overtighten the plugs, which could damage the threads.

Driveshaft

This section covers the torque specs for components of the driveshaft or propeller shaft, which transmit power from the transmission to the differential.

1

Propeller/Drive Shaft Bolts

M10 x 1.5
Torque Value
60 ft-lbs (81 N·m)
Important Notes
Tighten evenly to prevent vibration. Inspect flex discs (if equipped) for wear before installation.
2

Center Support Bearing Bolts

M8 x 1.25
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Check for proper driveshaft alignment before tightening the bolts. Inspect the rubber mount for degradation.

Differential

This section covers the torque specifications for mounting the differential to the chassis and servicing it.

1

Differential Mounting Bolts

M12 x 1.75
Torque Value
80 ft-lbs (108 N·m)
Important Notes
Ensure proper alignment before tightening. Use new bolts if necessary.
2

Differential Drain/Fill Plug

M18 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Use a new sealing washer. Do not overtighten to avoid damaging the threads.

Axles

This section includes torque specifications for components related to the drive axles and constant velocity (CV) joints.

1

Drive Axle/Half Shaft Bolts

M10 x 1.25
Torque Value
60 ft-lbs (81 N·m)
Important Notes
Ensure the axle is seated properly before tightening. Use new bolts if specified by the manufacturer.
2

CV Joint/Axle Nut

M24 x 1.5
Torque Value
180 ft-lbs (244 N·m)
Important Notes
This is a critical torque value that affects wheel bearing preload. Use new nut if specified by manufacturer and ensure proper axle alignment.
3

Input Shaft / Output Shaft Flange Nut

M18 x 1.5
Torque Value
120 ft-lbs (163 N·m)
Important Notes
Ensure shaft and flange are properly aligned prior to tightening the nut.

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 for drivetrain bolts?

Using the correct torque is crucial to ensure proper clamping force, preventing bolts from loosening due to vibrations, which could lead to component failure. Under-torqued bolts might loosen, while over-torqued ones can stretch or break, causing damage or unsafe conditions.

Q2

What happens if I over-torque a drivetrain bolt?

Over-torquing a bolt can lead to several issues. It can stretch the bolt beyond its yield point, weakening it and potentially causing it to break. Additionally, over-torquing can damage the threads in the component, making future repairs difficult or impossible. This can also distort the mating surfaces of the components.

Q3

Should I replace drivetrain bolts after removing them?

While not always mandatory, it is generally recommended to replace drivetrain bolts, especially those that are torque-to-yield (TTY) bolts, after removal. TTY bolts are designed to stretch upon tightening and cannot be reused safely. Using new bolts ensures proper clamping force and prevents future failures, as existing bolts may have stretched beyond their intended specifications, or the threads might have been damaged. If reusing bolts is unavoidable, use thread locker if it was originally used, and inspect closely for damage, and avoid reuse for bolts subject to high stress. The service manual should be consulted for any specific component reuse instructions. Examples of bolts that should always be replaced include differential ring gear bolts.

Q4

What type of lubricant should be used on drivetrain bolts?

The use of thread lubricants, or antiseize compounds depends on the bolt specifications and assembly instructions found within the BMW service manual. Some bolts are designed to be installed dry, while others require thread locking compound, or lubricant, and these procedures should be followed closely. Use of lubricants where not called for can cause an over-torque scenario. Some bolts may have micro-encapsulated thread locker already applied, and should be replaced with similar bolts. It is vital to follow the assembly procedure.

Q5

Can I use a generic torque wrench for drivetrain work?

While a generic torque wrench can be used, it is crucial to ensure it is calibrated correctly and within its accuracy range. It is highly recommended to use a high-quality, calibrated torque wrench designed for automotive work. For high stress bolts, a digital wrench is best. For accurate, professional, and safe results, investing in good equipment is vital.

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 accurately tightening bolts to manufacturer-specified torque values. A 1/2" drive is suitable for most drivetrain bolts.

  • Wide torque range
  • Audible click mechanism
  • Accurate calibration
Learn more

Torque Wrench (3/8" Drive)

A smaller 3/8" drive torque wrench is useful for lower torque applications, such as smaller bolts and fasteners within the drivetrain.

  • Suitable for lower torque values
  • Compact design for tight spaces
  • Accurate calibration
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets is required to fit various bolt head sizes used throughout the drivetrain.

  • Variety of sizes
  • Durable construction
  • Clear size markings
Learn more

Extension Bars

Extension bars provide extra reach for accessing bolts that are located in recessed or hard-to-reach areas of the drivetrain.

  • Various lengths available
  • Durable construction
  • Secure fit
Learn more

Universal Joint

A universal joint allows for access to bolts at an angle that a straight extension cannot reach.

  • Provides angled access
  • Durable construction
  • Secure fit
Learn more
Service Procedures

Front Driveshaft to Transfer Case Bolt Torque Procedure

This procedure outlines how to properly torque the bolts connecting the front driveshaft to the transfer case.

  • 1. Locate the front driveshaft to transfer case connection.
  • 2. Using the appropriate size socket, install new bolts.
  • 3. Tighten the bolts hand tight.
  • 4. Using a torque wrench set to 65 Nm (48 ft-lbs), tighten the bolts in a star pattern.
  • 5. Verify torque is within specification using the torque wrench.
View full procedure

Rear Driveshaft to Differential Bolt Torque Procedure

This procedure outlines how to properly torque the bolts connecting the rear driveshaft to the rear differential.

  • 1. Locate the rear driveshaft to rear differential connection.
  • 2. Install new bolts using the correct socket.
  • 3. Tighten the bolts hand tight.
  • 4. Using a torque wrench set to 65 Nm (48 ft-lbs), tighten the bolts in a star pattern.
  • 5. Verify torque is within specification using the torque wrench.
View full procedure

Front Axle Shaft to Hub Bolt Torque Procedure

This procedure outlines how to properly torque the bolts connecting the front axle shafts to the wheel hubs.

  • 1. Locate the front axle shaft to wheel hub connection.
  • 2. Install new bolts using the correct socket.
  • 3. Tighten the bolts hand tight.
  • 4. Using a torque wrench set to 100 Nm (74 ft-lbs), tighten the bolts in a star pattern.
  • 5. Verify torque is within specification using the torque wrench.
View full procedure

Rear Axle Shaft to Differential Flange Bolt Torque Procedure

This procedure outlines how to properly torque the bolts connecting the rear axle shafts to the differential flange.

  • 1. Locate the rear axle shaft to differential flange connection.
  • 2. Install new bolts using the correct socket.
  • 3. Tighten the bolts hand tight.
  • 4. Using a torque wrench set to 60 Nm (44 ft-lbs), tighten the bolts in a star pattern.
  • 5. Verify torque is within specification using the torque wrench.
View full procedure

Transfer Case Mounting Bolt Torque Procedure

This procedure outlines how to properly torque the bolts securing the transfer case to the transmission.

  • 1. Locate the transfer case mounting bolts.
  • 2. Install new bolts using the correct socket.
  • 3. Tighten the bolts hand tight.
  • 4. Using a torque wrench set to 60 Nm (44 ft-lbs), tighten the bolts in a star pattern.
  • 5. Verify torque is within specification using the torque wrench.
View full procedure
Technical Service Bulletins

Driveshaft Bolt Loosening Issue

2016-03-15

Some vehicles have experienced driveshaft bolt loosening, leading to vibration and potential damage. This is due to variations in factory assembly.

2014-2016 BMW X4 (F26)

Resolution: Inspect driveshaft bolts for proper torque. Replace bolts with new hardware and apply thread locking compound. Torque to specified values and re-inspect after 500 miles.

Transfer Case Mounting Bolt Fatigue

2017-11-20

Vehicles in high stress operation may develop fatigue on transfer case bolts resulting in looseness, noises, and possible damage to the mounting flange.

2014-2018 BMW X4 (F26)

Resolution: Inspect transfer case mounting bolts for proper torque and fatigue. Replace bolts and torque according to the service procedures listed above. Inspect more frequently for vehicles in high stress conditions.

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