Audi Audi A5 2007-2016 Drivetrain Bolt Torque Specifications
Comprehensive list of torque specifications for drivetrain bolts on the 2007-2016 Audi A5 (B8/8T) including transmission, differential, and driveshaft components.
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
Drivetrain Flywheel Flexplate
Torque specifications for flywheel and flexplate components.
1 Flywheel Bolts
M10 x 1.25
Flywheel Bolts
M10 x 1.25Torque Value
Important Notes
2 Flex Plate/Drive Plate Bolts
M10 x 1.25
Flex Plate/Drive Plate Bolts
M10 x 1.25Torque Value
Important Notes
Drivetrain Transmission
Torque specifications for transmission components.
1 Transmission Mounting Bolts
M12 x 1.75
Transmission Mounting Bolts
M12 x 1.75Torque Value
Important Notes
2 Transmission Oil Pan Bolts
M6 x 1.0
Transmission Oil Pan Bolts
M6 x 1.0Torque Value
Important Notes
3 Transmission Drain and Fill Plugs
M18 x 1.5
Transmission Drain and Fill Plugs
M18 x 1.5Torque Value
Important Notes
Drivetrain Clutch
Torque specifications for clutch pressure plate and disc components.
1 Clutch Pressure Plate Bolts
M8 x 1.25
Clutch Pressure Plate Bolts
M8 x 1.25Torque Value
Important Notes
2 Clutch Disc Bolts
M8 x 1.25
Clutch Disc Bolts
M8 x 1.25Torque Value
Important Notes
Drivetrain Axles
Torque specifications for drive axle/half shaft and CV joint components.
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
Drivetrain Driveshaft
Torque specifications for the propeller/drive shaft components.
1 Propeller/Drive Shaft Bolts
M10 x 1.5
Propeller/Drive Shaft Bolts
M10 x 1.5Torque Value
Important Notes
Drivetrain Differential
Torque specifications for the differential components.
1 Differential Mounting Bolts
M12 x 1.75
Differential Mounting Bolts
M12 x 1.75Torque Value
Important Notes
2 Differential Drain/Fill Plug
M18 x 1.5
Differential Drain/Fill Plug
M18 x 1.5Torque Value
Important Notes
Drivetrain Transfercase
Torque specifications for the transfer case components.
1 Transfer Case Drain/Fill Plug
M18 x 1.5
Transfer Case Drain/Fill Plug
M18 x 1.5Torque Value
Important Notes
Drivetrain Starter
Torque specifications for the starter motor components.
1 Starter Motor Mounting Bolts
M10 x 1.5
Starter Motor Mounting Bolts
M10 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 so important when working on the drivetrain?
Why are torque specifications so important when working on the drivetrain?
Torque specifications ensure proper clamping force between components. Insufficient torque can lead to loosening, vibration, and failure, while over-torquing can damage threads, warp components, or even cause bolt breakage. Proper torque is critical for the safety and longevity of the drivetrain system.
Q2 What happens if I don't use a torque wrench?
What happens if I don't use a torque wrench?
Without a torque wrench, it's very difficult to achieve the correct clamping force consistently. You might under-tighten bolts, leading to loose components, or over-tighten them, damaging parts. This can cause premature wear, drivetrain malfunctions, and potential safety issues.
Q3 Do I need to replace bolts when servicing the drivetrain?
Do I need to replace bolts when servicing the drivetrain?
In many cases, yes. Certain drivetrain bolts, especially those subject to high stress (like those on the driveshaft or differential), are designed for one-time use. They may stretch or yield upon tightening. Always refer to the service manual for specific instructions on bolt replacement. Reusing these bolts can compromise the assembly and lead to failure.
Q4 What is the difference between 'Nm' and 'lb-ft' for torque measurements?
What is the difference between 'Nm' and 'lb-ft' for torque measurements?
'Nm' stands for Newton-meters, which is the metric unit of torque, while 'lb-ft' stands for pound-feet, which is an imperial unit. They measure the same thing: rotational force. A conversion formula exists but the easiest method is to use a torque wrench which can toggle between the two. Always use a torque wrench which matches the specification provided in your manual.
Q5 Can I use threadlocker on drivetrain bolts?
Can I use threadlocker on drivetrain bolts?
Threadlocker can be used on some drivetrain bolts to help prevent them from loosening due to vibration. However, always consult the repair manual. The proper type and amount of threadlocker is crucial as some applications don't require it or require a specific type. For example, driveshaft bolts often come pre-coated with threadlocker.
Q6 What should I do if a bolt breaks while I'm torquing it?
What should I do if a bolt breaks while I'm torquing it?
Stop immediately. If a bolt breaks during tightening it likely means that it was over-torqued or it has failed. Inspect the surrounding parts for damage. The broken bolt will need to be carefully extracted and replaced with a new, correctly specified bolt. Ensure you understand the proper torque procedure before reattempting to tighten.
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
A calibrated torque wrench is essential for accurate tightening of drivetrain bolts to prevent damage or failure.
- Wide torque range to cover various drivetrain components
- Clearly marked scale for easy reading
- Audible click mechanism to indicate achieved torque
Socket Set (Metric)
A comprehensive set of metric sockets is required to fit the various bolt heads found in the Audi A5 drivetrain.
- Various sizes to fit all drivetrain fasteners
- 6-point sockets for better grip and reduced rounding risk
- Durable construction to withstand high torque applications
Extension Bars
Extension bars allow access to recessed or hard-to-reach drivetrain bolts.
- Various lengths for added reach
- Durable construction to withstand torque application
- Secure connection to prevent slippage
Universal Joint
A universal joint allows for torque application at an angle, which is sometimes needed for drivetrain components.
- Flexible joint to work around obstructions
- Durable construction to withstand torque application
- Secure connection to sockets and extensions
Service Procedures
Driveshaft Bolt Torque Procedure
This procedure outlines the steps for properly torquing the driveshaft bolts on a 2007-2016 Audi A5.
- 1. Identify the specific driveshaft bolts that need to be torqued.
- 2. Consult the appropriate repair manual for the correct torque specification.
- 3. Clean the threads of the bolts and mating surfaces.
- 4. Install the bolts by hand, ensuring they are properly aligned.
- 5. Using the torque wrench set to the specified torque, tighten the bolts in a cross pattern or the sequence specified in the manual, in multiple stages.
- 6. Recheck torque settings after several miles of driving.
Differential Mounting Bolt Torque Procedure
This procedure details how to correctly torque the bolts securing the differential to the chassis of the vehicle.
- 1. Identify the differential mounting bolts that require torque application.
- 2. Refer to the repair manual for the appropriate torque specifications.
- 3. Ensure threads are clean and free of debris.
- 4. Install mounting bolts by hand, making sure all bolts are equally seated before applying final torque.
- 5. Use the torque wrench set to the specified torque to tighten the bolts in a cross or specified pattern, working up to final torque specification in stages.
- 6. Double check the torque specification after driving a short distance, if specified in repair manual.
Transmission Mount Bolt Torque Procedure
This procedure guides you through properly tightening the bolts securing the transmission mounts.
- 1. Locate the transmission mount bolts that need to be torqued.
- 2. Confirm the correct torque specification for these bolts in the service manual.
- 3. Ensure all bolts and threads are clean before installation.
- 4. Install the bolts by hand, then snug them up, but do not apply full torque until all mount bolts are installed.
- 5. Torque the bolts to the specified torque using the calibrated torque wrench, following a specified pattern.
- 6. Inspect for correct alignment and proper torque specification.
Technical Service Bulletins
Driveshaft Bolt Loosening Issue
2011-03-15Some Audi A5 models have experienced issues with driveshaft bolts loosening prematurely. This can result in drivetrain vibration or noise.
Resolution: Replace driveshaft bolts with updated part number and apply thread locking compound during installation. Adhere to specified tightening sequence and torque specifications.
Differential Mounting Bolt Failure
2013-07-22A few cases of differential mounting bolt failure have been reported. This failure typically occurs due to improper torque application or bolt stretching over time.
Resolution: Replace affected mounting bolts with new ones that are to original specification. Follow proper torque procedure, and consider replacing all differential mount bolts if signs of wear or stretching are present.
Transmission Mount Bolt Elongation
2015-10-05Reports of transmission mount bolt elongation leading to increased noise and vibration within the drivetrain system.
Resolution: Replace transmission mount bolts with updated parts that have been improved to prevent elongation. Strict adherence to torque specifications and tightening sequence is critical.
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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.