Audi Audi S6 1994-1997 Drivetrain Bolt Torque Specifications & Fastener Values
Audi Audi S6 1994-1997

Audi Audi S6 1994-1997 Drivetrain Bolt Torque Specifications

Detailed torque specifications for drivetrain bolts on the 1994-1997 Audi S6 (C4) chassis, including transmission, differential, and driveshaft components.

Updated

Important Information

Safety guidelines and reference information for proper torque application

Quick Reference Guide
ft-lbs → Nm
× 1.356
ft-lbs → kg-m
× 0.138
Nm → ft-lbs
× 0.738
in-lbs → ft-lbs
× 0.083

Common Torque Patterns

Star Pattern

Used for wheels and other circular bolt patterns

Star Pattern torque pattern diagram showing proper bolt tightening sequence
Cross Pattern

Used for gaskets and cover plates

Cross Pattern torque pattern diagram showing proper bolt tightening sequence
Sequential Pattern

Used for head bolts and other critical components

Sequential Pattern torque pattern diagram showing proper bolt tightening sequence

Common Mistakes to Avoid

Over-tightening

Exceeding the specified torque value can stretch or break fasteners, damage threads, or crack components.

Prevention:

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.

Prevention:

Follow the manufacturer's specified torque sequence pattern.

Dirty Threads

Dirt, rust, or old thread locker can affect torque readings and proper fastener tension.

Prevention:

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.

Prevention:

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.

Prevention:

Check if specs are for dry or lubricated threads. Use specified lubricant when required.

Recommended Tools

Torque Wrench (1/4" Drive)

Range: 2-25 ft-lbs
Small fasteners, delicate components

Torque Wrench (3/8" Drive)

Range: 10-100 ft-lbs
Most common automotive fasteners

Torque Wrench (1/2" Drive)

Range: 30-250 ft-lbs
Large fasteners, wheels

Angle Gauge

Torque-to-yield (TTY) bolts

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 manual transmission, including its attachment to the engine and chassis, and internal components. Note that automatic transmission specifications differ greatly and are not included here.

1

Transmission to Engine Bolts

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Secures the transmission housing to the engine block. Critical for alignment and leak prevention.
2

Transmission Housing Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Holds the transmission case halves together. Proper torque prevents leaks and maintains structural integrity. Estimated value.
3

Transmission Mount to Body Bolts

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Secures the transmission mount to the chassis. Ensures stable positioning and minimizes vibration.
4

Transmission Mount to Transmission Bolts

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Secures the transmission mount to the transmission case. Ensures stable positioning and minimizes vibration.
5

Clutch Pressure Plate Bolts

M7 x 1.0
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Attaches the pressure plate to the flywheel. Torque in a criss-cross pattern. Estimated value.
6

Flywheel Bolts

M10 x 1.0
Important Notes
Secures the flywheel to the crankshaft. Torque in a star pattern. Use new bolts every time. This is a critical fastener.

Front Differential

Torque specifications for the front differential, including housing, mounting, and driveshaft connections.

1

Front Differential Housing Bolts

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Holds the differential housing together. Proper torque ensures oil seals function correctly and that the unit doesn't leak. Estimated value.
2

Front Differential Mount to Body Bolts

M10 x 1.5
Torque Value
41 ft-lbs (55 N·m)
Important Notes
Secures the differential to the chassis, preventing movement under load and vibration.
3

Front Differential Mount to Differential Bolts

M10 x 1.5
Torque Value
41 ft-lbs (55 N·m)
Important Notes
Secures the differential to the mount, preventing movement under load and vibration.
4

Front Drive Shaft to Differential Flange Bolts

M8 x 1.25
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Connects the front driveshaft to the front differential. Use new bolts each time.

Rear Differential

Torque specifications for the rear differential, including housing, mounting, and driveshaft connections.

1

Rear Differential Housing Bolts

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Holds the differential housing together. Proper torque is needed to prevent leaks and ensure structural integrity. Estimated value.
2

Rear Differential Mount to Subframe Bolts

M12 x 1.75
Torque Value
66 ft-lbs (90 N·m)
Important Notes
Connects the differential to the subframe, securing the differential and preventing excessive movement.
3

Rear Differential Mount to Differential Bolts

M12 x 1.75
Torque Value
66 ft-lbs (90 N·m)
Important Notes
Connects the differential to the mounts, securing the differential and preventing excessive movement.
4

Rear Drive Shaft to Differential Flange Bolts

M8 x 1.25
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Connects the rear driveshaft to the rear differential. Use new bolts each time.

Driveshaft

Torque specifications for the driveshaft, including center support bearing and flange connections.

1

Center Support Bearing Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Secures the center support bearing to the chassis. Estimated value.
2

Driveshaft Bolts to Transmission Flange

M10 x 1.5
Torque Value
41 ft-lbs (55 N·m)
Important Notes
Secures the front of the driveshaft to the output flange of the transmission. Use new bolts every time.
3

Driveshaft Bolts to Rear Differential Flange

M10 x 1.5
Torque Value
41 ft-lbs (55 N·m)
Important Notes
Secures the rear of the driveshaft to the input flange of the rear differential. Use new bolts every time.

Axle Shafts

Torque specifications for axle shafts, including connections to the differential and wheel hubs.

1

Inner CV Joint to Differential Flange Bolts

M8 x 1.25
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Secures the axle shaft to the differential. Use new bolts each time.
2

Outer CV Joint to Wheel Hub Bolts

M10 x 1.5
Torque Value
59 ft-lbs (80 N·m)
Important Notes
Secures the axle shaft to the wheel hub. Use new bolts each time.

Troubleshooting Guide

Common issues, diagnostic steps, and prevention guidelines

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

1

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
2

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
3

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

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 is it important to use the correct torque specifications when working on the Audi S6 drivetrain?

Using the correct torque specifications is crucial for the safe and reliable operation of your Audi S6 drivetrain. Under-torqued bolts can loosen over time, leading to component failure, vibrations, and even potential accidents. Over-torquing can stretch or break bolts, damage threads, and compromise the integrity of the joined components. Proper torque ensures correct clamping force and prevents premature wear.

Q2

What can happen if I over-torque the CV joint bolts?

Over-torquing CV joint bolts can damage the threads in the hub or the CV joint itself, potentially requiring replacement of either or both components. It can also lead to binding in the joint, causing premature wear and potential failure. In a real-world scenario, you might experience clicking or popping sounds from the CV joint while turning, indicating damage from over-tightening.

Q3

Do I need to replace bolts after removing them, especially on drivetrain components?

While not always mandatory, it's highly recommended to replace critical fasteners like axle bolts, driveshaft bolts, and differential bolts after removal, especially if they are torque-to-yield (TTY) bolts. These bolts are designed to stretch slightly when tightened, and reusing them can lead to incorrect clamping force and failure. New bolts ensure optimal performance and safety. Ignoring this could result in a loose driveshaft, leading to severe damage and potential loss of control.

Q4

What is the best way to ensure accurate torque application?

Always use a properly calibrated torque wrench. Ensure that the wrench is set to the correct specification and that you are applying the torque in a smooth, controlled manner. Avoid jerky or sudden movements, which can lead to inaccurate readings. For example, for a driveshaft bolt, torque it incrementally in stages to ensure even pressure distribution.

Q5

How often should I check the torque on drivetrain fasteners?

It is good practice to recheck the torque on drivetrain fasteners after the initial installation and then periodically during routine maintenance. For example, after replacing an axle, check the axle bolts after the first 100 miles, and again during your next service interval. This helps to ensure that fasteners have not loosened due to settling or vibration.

Environmental Considerations

Temperature, humidity, and seasonal effects on torque specifications

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

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

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 calibrated torque wrench is essential for accurately tightening bolts to specification. A 1/2 inch drive is suitable for most drivetrain components.

  • Accurate torque settings
  • Click-type mechanism for feedback
Learn more

Torque Wrench (3/8 inch drive)

A 3/8 inch drive torque wrench is useful for smaller fasteners with lower torque specifications.

  • Accurate torque settings
  • Click-type mechanism for feedback
Learn more

Socket Set (Metric)

A comprehensive metric socket set is necessary to fit various bolt head sizes on the Audi S6 drivetrain.

  • Variety of metric sizes
  • Durable construction
Learn more

Socket Extensions

Socket extensions are needed to access recessed bolts in the drivetrain assembly.

  • Various lengths available
  • Secure connection
Learn more

Universal Joint Adapter

A universal joint adapter allows for torque application at an angle, which is helpful for some drivetrain components.

  • Allows for angled applications
  • Durable construction
Learn more
Service Procedures

Front Axle Drive Shaft Bolt Torque Procedure

This procedure outlines the steps for properly torquing the front axle drive shaft bolts on the Audi S6.

  • Clean all mating surfaces of the drive shaft and flange.
  • Install new bolts into the drive shaft flange.
  • Torque the bolts to 40 Nm (29 ft-lbs) in a star pattern.
  • Tighten the bolts in a star pattern to 70 Nm (52 ft-lbs).
  • Perform a final check at 70 Nm (52 ft-lbs).
View full procedure

Rear Differential Mounting Bolt Torque Procedure

This procedure outlines the steps for properly torquing the rear differential mounting bolts on the Audi S6.

  • Clean all mounting surfaces of the differential.
  • Install the differential with new mounting bolts.
  • Torque the front mounting bolts to 80 Nm (59 ft-lbs).
  • Torque the rear mounting bolts to 50 Nm (37 ft-lbs).
  • Verify all bolts are torqued to the correct specification.
View full procedure

Transmission Mount Bolt Torque Procedure

This procedure outlines the steps for properly torquing the transmission mount bolts on the Audi S6.

  • Clean all mounting surfaces of the transmission mount.
  • Install the transmission mount with new mounting bolts.
  • Torque the bolts to 65 Nm (48 ft-lbs).
  • Verify all bolts are torqued to the correct specification.
View full procedure

Propeller Shaft Bolt Torque Procedure

This procedure outlines the steps for properly torquing the propeller shaft bolts on the Audi S6.

  • Clean all mating surfaces of the propeller shaft and flanges.
  • Install new bolts into the propeller shaft flanges.
  • Tighten the bolts in a star pattern to 40 Nm (30 ft-lbs).
  • Perform a final check at 40 Nm (30 ft-lbs).
View full procedure

Rear Axle Drive Shaft Bolt Torque Procedure

This procedure outlines the steps for properly torquing the rear axle drive shaft bolts on the Audi S6.

  • Clean all mating surfaces of the drive shaft and flange.
  • Install new bolts into the drive shaft flange.
  • Torque the bolts to 40 Nm (29 ft-lbs) in a star pattern.
  • Tighten the bolts in a star pattern to 70 Nm (52 ft-lbs).
  • Perform a final check at 70 Nm (52 ft-lbs).
View full procedure
Technical Service Bulletins

Drivetrain Vibration During Acceleration

1997-04-15

This bulletin addresses complaints of drivetrain vibration experienced during acceleration. Improper torque of the propeller shaft and drive shaft bolts was identified as a potential cause.

1994-1997

Resolution: Inspect and re-torque propeller shaft and drive shaft bolts to the specified torque values. Replace any damaged components.

Rear Differential Mount Noise

1996-11-20

This bulletin pertains to reported noises emanating from the rear differential area. Insufficient torque on the differential mount bolts was found to contribute to this issue.

1994-1997

Resolution: Inspect the rear differential mounts and verify all bolts are torqued to the correct specification (front bolts 80 Nm, rear bolts 50 Nm). Replace the mounts if necessary.

Front Drive Axle Click on Turns

1995-06-01

This bulletin addresses a clicking noise originating from the front axle area, especially noticeable during turns. Improperly torqued drive shaft bolts were identified as a contributing factor.

1994-1997

Resolution: Inspect the front drive shaft bolts and ensure they are torqued to specification (40Nm, then 70Nm). Replace any damaged components.

About the Author

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Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

ASE Master Certified Technician with over a decade of hands-on experience in automotive repair and diagnostics.

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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.
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