BMW M5 2018-present Drivetrain Bolt Torque Specifications
This page provides a comprehensive list of drivetrain bolt torque specifications for the 2018-present BMW M5 (F90) model. Includes torque values for critical components such as the driveshaft, differential, and axles.
Important Information
Safety guidelines and reference information for proper torque application
Safety First
- Always verify torque specifications with your vehicle's factory service manual
- Use properly calibrated torque wrenches
- Replace all torque-to-yield (TTY) bolts - they are single-use only
- When in doubt, consult a professional mechanic
Quick Reference Guide
Quick Reference Guide
Common Torque Patterns
Star Pattern
Used for wheels and other circular bolt patterns
Cross Pattern
Used for gaskets and cover plates
Sequential Pattern
Used for head bolts and other critical components
Common Mistakes to Avoid
Common Mistakes to Avoid
Over-tightening
Exceeding the specified torque value can stretch or break fasteners, damage threads, or crack components.
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.
Follow the manufacturer's specified torque sequence pattern.
Dirty Threads
Dirt, rust, or old thread locker can affect torque readings and proper fastener tension.
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.
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.
Check if specs are for dry or lubricated threads. Use specified lubricant when required.
Recommended Tools
Recommended Tools
Torque Wrench (1/4" Drive)
Torque Wrench (3/8" Drive)
Torque Wrench (1/2" Drive)
Angle Gauge
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 Flywheel
Specifications for bolts related to the engine flywheel, clutch assembly, and their related components. Ensuring proper torque is critical for power transfer and preventing vibration.
1 Flywheel Bolts
M12 x 1.5
Flywheel Bolts
M12 x 1.5Torque Value
Important Notes
2 Clutch Pressure Plate Bolts
M8 x 1.25
Clutch Pressure Plate Bolts
M8 x 1.25Torque Value
Important Notes
Transmission Mounting
Specifications for bolts securing the transmission to the engine and chassis, as well as bolts for the transmission case and drain/fill plugs. Proper torque ensures correct alignment and prevents leaks.
1 Transmission Mounting Bolts
M12 x 1.75
Transmission Mounting Bolts
M12 x 1.75Torque Value
Important Notes
2 Transmission Bell Housing Bolts to Engine
M10 x 1.5
Transmission Bell Housing Bolts to Engine
M10 x 1.5Torque Value
Important Notes
3 Transmission Oil Pan Bolts
M6 x 1.0
Transmission Oil Pan Bolts
M6 x 1.0Torque Value
Important Notes
4 Transmission Drain and Fill Plugs
M18 x 1.5
Transmission Drain and Fill Plugs
M18 x 1.5Torque Value
Important Notes
Driveshaft Axles
Specifications for bolts and nuts securing the driveshafts, axles, and CV joints. Proper torque is critical for ensuring reliable power delivery to the wheels.
1 Drive Axle/Half Shaft Bolts
M10 x 1.5
Drive Axle/Half Shaft Bolts
M10 x 1.5Torque Value
Important Notes
2 CV Joint/Axle Nut
M24 x 1.5
CV Joint/Axle Nut
M24 x 1.5Torque Value
Important Notes
3 Propeller/Drive Shaft Bolts
M10 x 1.25
Propeller/Drive Shaft Bolts
M10 x 1.25Torque Value
Important Notes
4 Driveshaft Center Support Bearing Bolts
M8 x 1.25
Driveshaft Center Support Bearing Bolts
M8 x 1.25Torque Value
Important Notes
5 Output Shaft Flange Bolts
M10 x 1.5
Output Shaft Flange Bolts
M10 x 1.5Torque Value
Important Notes
Differential Transfercase
Specifications for bolts related to the differential and transfer case, including mounting and drain/fill plugs. Proper torque is crucial for secure mounting and preventing leaks.
1 Differential Mounting Bolts
M14 x 2.0
Differential Mounting Bolts
M14 x 2.0Torque Value
Important Notes
2 Differential Drain/Fill Plug
M18 x 1.5
Differential Drain/Fill Plug
M18 x 1.5Torque Value
Important Notes
3 Transfer Case Drain/Fill Plug
M18 x 1.5
Transfer Case Drain/Fill Plug
M18 x 1.5Torque Value
Important Notes
Troubleshooting Guide
Common issues, diagnostic steps, and prevention guidelines
Common Issues
Bolt stretching, stripped threads, uneven torque patterns
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
Diagnostic Steps
Visual inspection, torque verification, thread assessment
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
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
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
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 torque specifications important for drivetrain bolts?
Why are torque specifications important for drivetrain bolts?
Correct torque is crucial to prevent bolt failure, component damage, and loosening due to vibration. Under-tightening can lead to parts coming loose, while over-tightening can stretch or break the bolts, potentially leading to catastrophic failures. For example, an improperly torqued driveshaft bolt could shear, resulting in loss of vehicle control.
Q2 What happens if I don't have a torque wrench?
What happens if I don't have a torque wrench?
While it's strongly recommended to use a torque wrench for all drivetrain bolts, in an emergency, a wrench can be used with extra care and some practice to get you back on the road. You must use a specific torque wrench to correctly measure how much tension is being added to the fastener. When using a regular wrench, it is possible to over or under-tighten the fasteners which can cause damage or cause the components to come undone. Use of a torque wrench is crucial for proper safety.
Q3 Should I use new bolts when working on the drivetrain?
Should I use new bolts when working on the drivetrain?
Yes, it's highly recommended to replace many drivetrain bolts, especially those that are torque-to-yield (TTY) or stretch bolts. These bolts are designed to deform slightly when torqued correctly, and reusing them can lead to unpredictable clamping force and potential failure. For instance, differential bolts should almost always be replaced when removed.
Q4 What should I do if a bolt feels like it's starting to strip?
What should I do if a bolt feels like it's starting to strip?
If a bolt feels like it's stripping, stop immediately. Continuing will almost certainly damage the threads further and render the fastener unusable. Back the bolt out and inspect it and the hole it goes in to. If the hole or bolt is damaged, it needs to be replaced before moving forward. Continuing to tighten a stripped bolt will result in damage that requires costly repairs.
Q5 What are the common torque values for the F90 M5's drivetrain?
What are the common torque values for the F90 M5's drivetrain?
While specific values vary, common torque values include 30-40 Nm for smaller bolts (e.g., driveshaft flange bolts), 70-90 Nm for differential mounting bolts, and often an additional angle torque is necessary for critical applications like driveshaft center support bolts. Always refer to the BMW service manual for exact specifications.
Environmental Considerations
Temperature, humidity, and seasonal effects on torque specifications
Temperature Effects
Includes: High Heat, Cold Weather, Thermal Cycling
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
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
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 high-quality 1/2 inch drive torque wrench is essential for accurately tightening drivetrain bolts to the specified torque.
- Wide torque range
- Accurate measurement
- Durable construction
Torque Wrench (3/8 inch Drive)
A 3/8 inch drive torque wrench, often required for smaller bolts in the drivetrain.
- Smaller size for hard to reach places
- Accurate Measurement
- Durable construction
Socket Set (1/2 inch Drive, Metric)
A comprehensive set of metric sockets, including sizes commonly used on the M5 drivetrain.
- Various sizes
- Durable steel construction
- Precise fit
Socket Set (3/8 inch Drive, Metric)
A comprehensive set of metric sockets, including smaller sizes often used on the M5 drivetrain.
- Various sizes
- Durable steel construction
- Precise fit
Universal Joint Adapter (1/2 & 3/8 inch Drive)
Allows for torque application at an angle where access is restricted.
- Durable construction
- Smooth rotation
- Secure fit
Extension Bars (1/2 & 3/8 inch Drive)
Used to provide additional reach for hard-to-access bolts.
- Variety of lengths
- Durable construction
- Secure connection
Service Procedures
Driveshaft Bolt Tightening
Procedure for correctly tightening driveshaft bolts on the 2018-Present BMW M5.
- Identify the correct bolt size and torque specification (check manufacturer documentation).
- Clean the threads of the bolts and mating surfaces.
- Apply thread locking compound if specified by the manufacturer.
- Install the bolts by hand, ensuring they are correctly aligned.
- Using the appropriate size socket and a calibrated torque wrench, tighten the bolts to the specified torque value in a star pattern.
- If the bolts are torque-to-yield, follow the specified angle tightening procedure after initial torque.
- Double-check all bolts to ensure the correct torque has been applied.
Differential Mounting Bolt Tightening
Procedure for correctly tightening the bolts securing the differential to the chassis on the 2018-Present BMW M5.
- Identify the correct bolt size and torque specification (check manufacturer documentation).
- Clean the threads of the bolts and mating surfaces.
- Apply thread locking compound if specified by the manufacturer.
- Install the bolts by hand, ensuring they are correctly aligned.
- Using the appropriate size socket and a calibrated torque wrench, tighten the bolts to the specified torque value in a star pattern.
- If the bolts are torque-to-yield, follow the specified angle tightening procedure after initial torque.
- Double-check all bolts to ensure the correct torque has been applied.
Wheel Hub/Bearing Assembly Bolt Tightening
Procedure for correctly tightening the bolts securing the wheel hub/bearing assembly to the steering knuckle on the 2018-Present BMW M5.
- Identify the correct bolt size and torque specification (check manufacturer documentation).
- Clean the threads of the bolts and mating surfaces.
- Apply thread locking compound if specified by the manufacturer.
- Install the bolts by hand, ensuring they are correctly aligned.
- Using the appropriate size socket and a calibrated torque wrench, tighten the bolts to the specified torque value in a star pattern.
- If the bolts are torque-to-yield, follow the specified angle tightening procedure after initial torque.
- Double-check all bolts to ensure the correct torque has been applied.
Technical Service Bulletins
Driveshaft Bolt Loosening Issue
2020-07-15Some 2018-2019 M5 models have reported driveshaft bolt loosening due to improper initial torque application.
Resolution: Inspect driveshaft bolts and retighten to the specified torque, using new bolts where possible. Ensure that the proper torque sequence is followed and any required thread locking compound is used.
Differential Mounting Noise and Loosening
2021-03-22Reports of differential noise and movement were found to be due to incorrectly torqued mounting bolts on certain 2020 M5s.
Resolution: Inspect all differential mounting bolts. Ensure that they are torqued to the correct specification and sequence. Replace any bolts that show signs of wear or stress.
Wheel Hub Bolt Inspection
2022-11-10A few cases have been reported of wheel hub bolts loosening on high-performance M5 vehicles. This is due to excessive heat and stress on the components.
Resolution: Perform visual inspection of the wheel hub bolts for wear and deformation. Ensure correct torque is applied during installation following the manufacturer's guidelines. Replace any damaged bolts.
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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.
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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.
- 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.