Audi Audi TTS 2015-present Drivetrain Bolt Torque Specifications
Comprehensive list of bolt torque specifications for the drivetrain components of the 2015-Present Audi TTS, including transmission, differential, driveshaft, and related fasteners.
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
Transmission
Torque specifications for various components of the transmission and transaxle assembly.
1 Transmission Mount Bolts to Chassis (Front & Rear)
M12 x 1.75 (Estimated)
Transmission Mount Bolts to Chassis (Front & Rear)
M12 x 1.75 (Estimated)Important Notes
2 Transmission Mount to Transmission Housing Bolts
M10 x 1.5
Transmission Mount to Transmission Housing Bolts
M10 x 1.5Important Notes
3 Transmission Housing Bolts (Case Bolts)
M8 x 1.25
Transmission Housing Bolts (Case Bolts)
M8 x 1.25Torque Value
Important Notes
4 Transmission Housing Bolts (Case Bolts)
M10 x 1.5
Transmission Housing Bolts (Case Bolts)
M10 x 1.5Torque Value
Important Notes
5 Mechatronics Unit Bolts
M6 x 1.0
Mechatronics Unit Bolts
M6 x 1.0Important Notes
6 Output Shaft Flange Bolts
M10 x 1.5 (Estimated)
Output Shaft Flange Bolts
M10 x 1.5 (Estimated)Torque Value
Important Notes
7 Drain Plug
M18 x 1.5 (Estimated)
Drain Plug
M18 x 1.5 (Estimated)Torque Value
Important Notes
8 Fill Plug
M18 x 1.5 (Estimated)
Fill Plug
M18 x 1.5 (Estimated)Torque Value
Important Notes
9 Differential Housing Bolts (Integrated into Transaxle)
M10 x 1.5
Differential Housing Bolts (Integrated into Transaxle)
M10 x 1.5Torque Value
Important Notes
Haldex Coupling
Torque specifications for the Haldex coupling unit.
1 Haldex Coupling Bolts (Rear Differential)
M8 x 1.25
Haldex Coupling Bolts (Rear Differential)
M8 x 1.25Important Notes
Driveshaft Axles
Torque specifications for components of the driveshaft and axle assemblies.
1 Driveshaft Center Support Bearing Bolts to Chassis
M8 x 1.25 (Estimated)
Driveshaft Center Support Bearing Bolts to Chassis
M8 x 1.25 (Estimated)Torque Value
Important Notes
2 Driveshaft Flange Bolts to Transmission Output Flange
M10 x 1.5 (Estimated)
Driveshaft Flange Bolts to Transmission Output Flange
M10 x 1.5 (Estimated)Torque Value
Important Notes
3 Driveshaft Flange Bolts to Rear Differential Flange
M10 x 1.5 (Estimated)
Driveshaft Flange Bolts to Rear Differential Flange
M10 x 1.5 (Estimated)Torque Value
Important Notes
4 Outer CV Joint Bolt/Nut to Wheel Hub (Axle Nut)
M24 x 1.5
Outer CV Joint Bolt/Nut to Wheel Hub (Axle Nut)
M24 x 1.5Important Notes
5 Inner CV Joint Bolts to Transmission Flange
M8 x 1.25 (Estimated)
Inner CV Joint Bolts to Transmission Flange
M8 x 1.25 (Estimated)Torque Value
Important Notes
Rear Differential
Torque specifications for the rear differential unit.
1 Rear Differential Mounting Bolts to Subframe
M12 x 1.75
Rear Differential Mounting Bolts to Subframe
M12 x 1.75Important Notes
2 Rear Differential Case Bolts
M10 x 1.5
Rear Differential Case Bolts
M10 x 1.5Torque Value
Important Notes
3 Rear Differential Fluid Drain Plug
M18 x 1.5 (Estimated)
Rear Differential Fluid Drain Plug
M18 x 1.5 (Estimated)Torque Value
Important Notes
4 Rear Differential Fluid Fill Plug
M18 x 1.5 (Estimated)
Rear Differential Fluid Fill Plug
M18 x 1.5 (Estimated)Torque Value
Important Notes
Wheel Hubs Bearings
Torque specifications for wheel hub and bearing components.
1 Wheel Bearing Housing to Suspension Knuckle Bolts
M12 x 1.75
Wheel Bearing Housing to Suspension Knuckle Bolts
M12 x 1.75Important Notes
2 Wheel Speed Sensor Bolts
M6 x 1.0 (Estimated)
Wheel Speed Sensor Bolts
M6 x 1.0 (Estimated)Torque 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 proper torque specifications important for drivetrain bolts?
Why are proper torque specifications important for drivetrain bolts?
Proper torque is crucial to ensure components are held securely without being overstressed. Under-torquing can lead to loosening, vibrations, and component failure, while over-torquing can damage threads, bolts, and the components themselves. In the drivetrain, this could result in catastrophic failure and loss of control.
Q2 What happens if I over-torque a drivetrain bolt?
What happens if I over-torque a drivetrain bolt?
Over-torquing can stretch or break the bolt, damage the threads on the mating component, or distort the component itself. This can lead to premature failure, difficulty in future removal, or even a catastrophic failure while driving. For example, over-tightening the prop shaft bolts can warp the flange and cause driveline vibrations.
Q3 What happens if I under-torque a drivetrain bolt?
What happens if I under-torque a drivetrain bolt?
Under-torquing can cause bolts to loosen over time due to vibration and stress. This can lead to play in the drivetrain components, resulting in noise, premature wear, and potentially complete failure. For instance, loose axle bolts can cause clicking noises and eventual joint failure.
Q4 Do torque specifications change if I use aftermarket bolts?
Do torque specifications change if I use aftermarket bolts?
Yes, torque specifications can vary significantly with aftermarket bolts, especially if the material or grade is different from the OEM specification. Always consult the aftermarket bolt manufacturer's specifications and err on the side of caution. Never assume they match OEM torque figures.
Q5 Do I need to use new bolts every time I remove drivetrain components?
Do I need to use new bolts every time I remove drivetrain components?
It depends on the component and the bolt type. Many torque-to-yield (TTY) bolts, especially those used in critical areas like axle and prop shaft connections, must be replaced every time they are removed. These bolts stretch when torqued and are not designed for re-use. Check your service manual.
Q6 What tools do I need to properly torque drivetrain bolts?
What tools do I need to properly torque drivetrain bolts?
You'll need a calibrated torque wrench appropriate for the specified range, appropriate sockets, and potentially extensions or adapters. Some components also require a specific angle torque adapter after the initial torque. Avoid using impact wrenches for final torquing as it's nearly impossible to achieve accurate torque.
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 1/2 inch drive torque wrench capable of measuring torque within the range required for drivetrain components.
- Click-type mechanism
- Accurate calibration
- Wide torque range (e.g. 20-200 Nm)
Torque Wrench (3/8" Drive)
A 3/8 inch drive torque wrench for lower torque applications within the drivetrain system.
- Click-type mechanism
- Accurate calibration
- Medium torque range (e.g. 10-80 Nm)
Socket Set (Metric)
A comprehensive set of metric sockets, including sizes commonly used on the Audi TTS drivetrain.
- Variety of sizes
- Deep and shallow sockets
- High-quality construction
Socket Extensions (1/2" and 3/8")
Extensions to access recessed bolts and fasteners within the drivetrain assembly.
- Various lengths
- Durable material
- Secure fitment
Universal Joint (1/2" and 3/8")
To reach difficult angles when tightening bolts within the drivetrain.
- Smooth rotation
- Durable material
- Secure fit
Angled Torque Adapter
An angled adapter to achieve correct torque on hard-to-reach fasteners
- Multiple angle settings
- Precision engineering
- Torque transfer accuracy
Service Procedures
Driveshaft Bolt Torque Procedure
Procedure for correctly torquing driveshaft bolts to the specified values. Failure to properly torque can result in vibrations and component damage.
- 1. Identify the correct bolt size and torque specification in the vehicle's service manual.
- 2. Clean all mating surfaces and threads of any debris.
- 3. Apply a small amount of anti-seize compound to the threads of the bolts.
- 4. Hand-tighten the bolts in a star pattern, making sure the driveshaft is centered.
- 5. Using a correctly calibrated torque wrench, torque the bolts to the initial stage torque in a star pattern.
- 6. Torque the bolts to the final specification in a star pattern.
- 7. Double-check each bolt using the torque wrench.
Differential Mounting Bolt Torque Procedure
Procedure for correctly torquing the differential mounting bolts. Incorrect torque can lead to alignment issues and premature wear.
- 1. Identify the correct bolt size and torque specification for the differential mounting bolts.
- 2. Clean the mounting surfaces and the threads of the mounting bolts.
- 3. Start the mounting bolts and tighten until snug.
- 4. Torque all bolts to the initial torque specification following the tightening sequence provided in the service manual.
- 5. Torque all bolts to the final torque specification following the tightening sequence provided in the service manual.
- 6. Double-check each bolt using the torque wrench to ensure correct torque.
Rear Axle Bolt Torque Procedure
Procedure for correctly torquing the rear axle bolts. Improper torque can lead to poor handling and safety issues.
- 1. Identify the correct bolt size and torque specification for the rear axle bolts.
- 2. Clean all mating surfaces of any debris.
- 3. Start the mounting bolts and tighten until snug.
- 4. Torque the bolts to the initial torque value in a star pattern.
- 5. Torque the bolts to the final torque value in a star pattern.
- 6. Double-check each bolt using the torque wrench.
Technical Service Bulletins
Driveshaft Bolt Loosening
2018-06-15Some 2015-2017 TTS models may experience loosening of the driveshaft bolts due to insufficient torque application at the factory.
Resolution: Inspect driveshaft bolt torque and tighten to the updated specification of 70 Nm + 90 degree turn. Apply thread locker to the threads before reassembly.
Differential Mount Bolt Corrosion
2020-11-20Certain 2016-2019 Audi TTS models in regions with high road salt usage have experienced corrosion around the differential mount bolts.
Resolution: Inspect differential mounting bolts and their surrounding area for corrosion. Remove and replace corroded bolts with new ones. Apply anti-seize to new bolts and torque to the specification of 55Nm + 90 degree turn.
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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.