Audi Audi S6 2012-2018 Drivetrain Bolt Torque Specifications
Comprehensive list of torque specifications for various drivetrain bolts on the 2012-2018 Audi S6 (C7) model. Includes transmission, differential, and driveshaft bolt torques.
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 the 7-speed dual-clutch transmission components.
1 Transmission to Engine Bolts
M12 x 1.5
Transmission to Engine Bolts
M12 x 1.5Torque Value
Important Notes
2 Transmission Mount Bolts
M10 x 1.5
Transmission Mount Bolts
M10 x 1.5Important Notes
3 Mechatronics Unit Cover Bolts
M6
Mechatronics Unit Cover Bolts
M6Torque Value
Important Notes
4 Oil Pan Bolts
M6
Oil Pan Bolts
M6Torque Value
Important Notes
5 Driveshaft to Transmission Flange Bolts
M10 x 1.5
Driveshaft to Transmission Flange Bolts
M10 x 1.5Torque Value
Important Notes
6 Flywheel Bolts
M12 x 1.5
Flywheel Bolts
M12 x 1.5Important Notes
Front Differential
Torque specifications for the front differential components.
1 Differential Housing Bolts
M10 x 1.5
Differential Housing Bolts
M10 x 1.5Important Notes
2 Drive Shaft Flange bolts
M8 x 1.25
Drive Shaft Flange bolts
M8 x 1.25Torque Value
Important Notes
Center Differential
Torque specifications for the Torsen center differential components.
1 Center Differential Housing Bolts
M10 x 1.5
Center Differential Housing Bolts
M10 x 1.5Important Notes
2 Driveshaft Flange to Differential Bolts
M10 x 1.5
Driveshaft Flange to Differential Bolts
M10 x 1.5Torque Value
Important Notes
Rear Differential
Torque specifications for the rear differential components.
1 Differential Housing Bolts
M10 x 1.5
Differential Housing Bolts
M10 x 1.5Important Notes
2 Driveshaft Flange to Differential Bolts
M10 x 1.5
Driveshaft Flange to Differential Bolts
M10 x 1.5Torque Value
Important Notes
3 Rear Axle Flange to Differential Bolts
M10 x 1.5
Rear Axle Flange to Differential Bolts
M10 x 1.5Torque Value
Important Notes
Driveshaft
Torque specifications for the driveshaft components.
1 Center Support Bearing Bolts
M8 x 1.25
Center Support Bearing Bolts
M8 x 1.25Torque Value
Important Notes
2 Driveshaft Flange Bolts
M10 x 1.5
Driveshaft Flange Bolts
M10 x 1.5Torque Value
Important Notes
Axles Halfshafts
Torque specifications for the axle and half shaft components.
1 Inner CV Joint Bolts
M10 x 1.5
Inner CV Joint Bolts
M10 x 1.5Torque Value
Important Notes
2 Outer CV Joint/Wheel Hub Bolts
M10 x 1.5
Outer CV Joint/Wheel Hub Bolts
M10 x 1.5Torque Value
Important Notes
Wheel Hubs
Torque specifications for wheel hub and wheel components.
1 Wheel Bearing Bolt
M18
Wheel Bearing Bolt
M18Important Notes
2 Wheel Lug Bolts
M14 x 1.5
Wheel Lug Bolts
M14 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 specifications ensure proper clamping force, preventing bolts from loosening due to vibration or stress, and avoiding damage to threaded components. Over-torquing can lead to bolt failure or damage to the component, while under-torquing can cause loosening and potential failure. For example, improperly torqued driveshaft bolts could lead to dangerous vibrations or even component detachment.
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 almost impossible to achieve the correct torque consistently. You may either over or under tighten bolts. 'Feeling' it is unreliable and can lead to serious problems. For example, incorrectly torqued differential bolts can cause leaks, damage gears or even case failure. A torque wrench is essential for drivetrain work.
Q3 Do I need to replace bolts after loosening them?
Do I need to replace bolts after loosening them?
In many cases, especially with torque-to-yield (TTY) bolts which are often used on drivetrain components, it's crucial to replace them after loosening. These bolts are designed to stretch upon tightening, achieving a specific clamping force. Reusing them can compromise their integrity and clamping power, leading to issues. For example, driveshaft bolts often require replacement.
Q4 What should I do if I accidentally over-torque a bolt?
What should I do if I accidentally over-torque a bolt?
If you suspect you've over-torqued a bolt, you should stop immediately. Over-torqued bolts can stretch or shear, leading to failure. It's recommended to replace the over-torqued bolt and carefully inspect the threaded hole for damage. If the bolt is a critical component, it might be wise to consult a professional.
Q5 How often should I check the torque of drivetrain bolts?
How often should I check the torque of drivetrain bolts?
Generally, unless you've recently worked on the drivetrain, you don't need to routinely check all bolts. However, if you experience unusual vibrations, noises, or have recently replaced a drivetrain component, it is good practice to check the torque on those bolts as per manufacturer specifications. A good approach is to check after initial installation or replacement and after about 100 miles of driving.
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 accurate torque to drivetrain bolts.
- Accurate torque application
- Click-type mechanism
- Wide torque range (e.g., 20-200 ft-lbs)
Torque Wrench (3/8" Drive)
A smaller torque wrench for tighter spaces and lower torque applications.
- Accurate torque application
- Click-type mechanism
- Medium torque range (e.g., 5-80 ft-lbs)
Socket Set (Metric)
A comprehensive set of metric sockets to fit various bolt and nut sizes on the drivetrain.
- Variety of sizes (e.g., 8mm - 24mm)
- 6-point design for optimal grip
- Durable construction
Socket Extensions
Various socket extensions to access bolts in hard-to-reach areas.
- Multiple lengths (e.g., 3", 6", 10")
- Durable construction
- Secure connection to sockets
Universal Joint
A universal joint to access bolts at angles.
- Multiple angle adjustments
- Durable construction
- Secure connection to sockets
Service Procedures
Front Differential Bolt Torque Procedure
Procedure for torquing the bolts connecting the front differential to the vehicle.
- Locate all front differential mounting bolts.
- Clean the bolt threads and mating surfaces.
- Apply the appropriate thread locker (if specified).
- Tighten all bolts finger tight.
- Torque the bolts to the first specified torque value in a cross pattern.
- Torque the bolts to the final specified torque value in a cross pattern.
- Verify final torque of all bolts.
Rear Differential Bolt Torque Procedure
Procedure for torquing the bolts connecting the rear differential to the vehicle.
- Locate all rear differential mounting bolts.
- Clean the bolt threads and mating surfaces.
- Apply the appropriate thread locker (if specified).
- Tighten all bolts finger tight.
- Torque the bolts to the first specified torque value in a cross pattern.
- Torque the bolts to the final specified torque value in a cross pattern.
- Verify final torque of all bolts.
Driveshaft Bolt Torque Procedure
Procedure for torquing the bolts connecting the driveshaft to the transmission and differentials.
- Locate all driveshaft bolts.
- Clean the bolt threads and mating surfaces.
- Apply the appropriate thread locker (if specified).
- Tighten all bolts finger tight.
- Torque the bolts to the first specified torque value in a cross pattern.
- Torque the bolts to the final specified torque value in a cross pattern.
- Verify final torque of all bolts.
Transmission Mounting Bolt Torque Procedure
Procedure for torquing the bolts connecting the transmission to the vehicle.
- Locate all transmission mounting bolts.
- Clean the bolt threads and mating surfaces.
- Apply the appropriate thread locker (if specified).
- Tighten all bolts finger tight.
- Torque the bolts to the first specified torque value in a cross pattern.
- Torque the bolts to the final specified torque value in a cross pattern.
- Verify final torque of all bolts.
Technical Service Bulletins
Driveshaft Bolt Loosening Issue
2016-03-15Some 2013-2016 Audi S6 models may experience driveshaft bolt loosening due to improper initial torque application at the factory.
Resolution: Inspect and re-torque all driveshaft bolts to the updated specification. Use new bolts with thread locker if necessary.
Front Differential Bolt Torque Update
2017-08-20A revised torque specification for front differential mounting bolts on 2015-2017 Audi S6 models. Use a specific torque sequence to ensure even clamping load.
Resolution: Refer to the updated service manual for the specific front differential bolt torque specification and tightening sequence.
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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.