Audi Audi A5 2016-present Drivetrain Bolt Torque Specifications
Comprehensive guide to drivetrain bolt torque specifications for the 2016-Present Audi A5, including axle bolts, driveshaft bolts, transmission mounts, and differential bolts.
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
Torque specifications for flywheel, clutch, and torque converter components.
1 Flywheel Bolts
M10 x 1.25
Flywheel Bolts
M10 x 1.25Torque Value
Important Notes
2 Clutch Pressure Plate Bolts
M8 x 1.25
Clutch Pressure Plate Bolts
M8 x 1.25Torque Value
Important Notes
3 Torque Converter Bolts
M10 x 1.25
Torque Converter Bolts
M10 x 1.25Torque Value
Important Notes
4 Flex Plate Bolts
M10 x 1.25
Flex Plate Bolts
M10 x 1.25Torque Value
Important Notes
Drivetrain Transmission
Torque specifications for transmission mounting and related components.
1 Transmission Mounting Bolts
M12 x 1.75
Transmission Mounting Bolts
M12 x 1.75Torque Value
Important Notes
2 Transmission Bellhousing Bolts
M12 x 1.75
Transmission Bellhousing Bolts
M12 x 1.75Torque Value
Important Notes
3 Transmission Oil Pan Bolts
M6 x 1.0
Transmission Oil Pan Bolts
M6 x 1.0Torque 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 propeller/drive shaft components.
1 Propeller/Drive Shaft Bolts
M8 x 1.25
Propeller/Drive Shaft Bolts
M8 x 1.25Torque Value
Important Notes
Drivetrain Differential
Torque specifications for the differential and related components.
1 Differential Housing Mounting Bolts
M12 x 1.75
Differential Housing Mounting Bolts
M12 x 1.75Torque Value
Important Notes
2 Differential Drain/Fill Plug
M20 x 1.5
Differential Drain/Fill Plug
M20 x 1.5Torque Value
Important Notes
Drivetrain Transfercase
Torque specifications for the transfer case and related components.
1 Transfer Case Drain/Fill Plug
M20 x 1.5
Transfer Case Drain/Fill Plug
M20 x 1.5Torque Value
Important Notes
Drivetrain Starter
Torque specifications for starter motor mounting.
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 correct torque specifications important for drivetrain bolts?
Why are correct torque specifications important for drivetrain bolts?
Proper torque is crucial for ensuring the safe and reliable operation of your Audi A5's drivetrain. Under-torqued bolts can loosen over time, leading to component failure, vibrations, and potential accidents. Over-torquing can damage the bolt, threads, or the component itself, causing premature wear or failure. For example, over-torquing a driveshaft bolt can stretch it, making it more prone to snapping under load.
Q2 Where can I find the specific torque specs for my exact Audi A5 model and year?
Where can I find the specific torque specs for my exact Audi A5 model and year?
While this document provides common drivetrain torque specifications, always refer to your vehicle's specific repair manual or the official Audi service documentation for the most accurate and up-to-date values. These can often be found through a dealer service department, a qualified mechanic, or through online subscription databases. For example, torque specifications can vary slightly between Quattro and Front-Wheel-Drive models, even within the same model year.
Q3 Do I need special tools to torque drivetrain bolts correctly?
Do I need special tools to torque drivetrain bolts correctly?
Yes, a calibrated torque wrench is essential. Using a standard wrench or 'feel' is not accurate and can lead to under or over-torquing. Additionally, some drivetrain components might require specific tools for proper installation or removal before applying torque. For instance, driveshaft bolts often require triple square socket for removal and torquing.
Q4 Should I use thread locker on drivetrain bolts?
Should I use thread locker on drivetrain bolts?
The use of thread locker depends on the specific application. Some drivetrain bolts, especially those subjected to vibration or significant stress, may require thread locker to prevent loosening. The Audi repair manual will specify if and what type of thread locker is required (e.g., Loctite 243 or equivalent). Using threadlocker when not required can make future repairs more difficult. For example, typically differential carrier bolts will require threadlocker.
Q5 What does 'torque-to-yield' mean, and is it relevant to my Audi A5's drivetrain?
What does 'torque-to-yield' mean, and is it relevant to my Audi A5's drivetrain?
Torque-to-yield (TTY) bolts are designed to stretch when torqued, reaching a point beyond their elastic limit, and must be replaced after being loosened. This is often the case with certain high-stress drivetrain components such as transmission mounts, some axle bolts and steering components attached to the frame. Refer to your service manual to verify which bolts are torque-to-yield.
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" Drive)
A calibrated torque wrench is essential for applying precise torque to drivetrain bolts.
- Wide torque range (typically 20-200 Nm)
- Audible click or digital readout indicating torque achieved
Torque Wrench (3/8" Drive)
A smaller torque wrench for lower torque specifications in the drivetrain system.
- Lower torque range (typically 5-80 Nm)
- More maneuverable in tight spaces
Socket Set (Metric)
A comprehensive set of metric sockets to match various bolt head sizes on the drivetrain.
- Includes a range of sizes (e.g. 8mm to 24mm)
- 6-point or 12-point options for better grip
Universal Joint
Allows sockets to be used at an angle.
- 1/2" and 3/8" drive
- Durable construction
Angled Torque Adapter
Allows for accurate torque application when a straight approach is not possible.
- Maintains accurate torque values when applied at an angle
- Various angles available
Service Procedures
Front Axle CV Joint Bolt Torque Procedure
Procedure for correctly torquing the bolts connecting the CV joint to the front axle.
- Locate the CV joint bolts.
- Use the correct size socket and torque wrench.
- Torque the bolts to the specified torque using a crisscross pattern.
- Re-torque after a brief drive, or as specified in the manual.
Rear Differential Mounting Bolt Torque Procedure
Procedure for correctly torquing the mounting bolts for the rear differential.
- Locate the rear differential mounting bolts.
- Clean the threads on bolts and mounting points.
- Use the correct size socket and torque wrench.
- Torque the bolts to the specified torque value in a sequence pattern per the service manual.
- Re-torque after a brief drive or as specified in the manual.
Driveshaft Center Support Bearing Bolt Torque Procedure
Procedure for correctly torquing the bolts that secure the driveshaft center support bearing.
- Locate the driveshaft center support bearing mounting bolts.
- Use the correct size socket and torque wrench.
- Torque the bolts to the specified torque in the correct sequence
- Re-torque after a brief drive, or as specified in the manual.
Technical Service Bulletins
Revised Torque Specification for Driveshaft Bolts
2018-05-15A revised torque specification for the driveshaft bolts has been issued to address premature loosening issues.
Resolution: Use the new torque specification provided in TSB update. Discard old bolts.
Differential Mounting Bolt Corrosion Concerns
2020-11-20Technical bulletin regarding potential corrosion issues with differential mounting bolts.
Resolution: Inspect the differential mounting bolts for corrosion, replace any corroded bolts, and apply thread locker according to the revised procedure
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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.