Audi Audi S6 2018-present DL501 Transmission Transmission Torque Specifications & Bolt Torque Values
Audi Audi S6 2018-present

Audi Audi S6 2018-present DL501 Transmission Torque Specifications

This page provides the detailed torque specifications for bolts related to the DL501 transmission in the 2018-Present Audi S6 (C8) generation.

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 Case

These bolts secure the two halves of the transmission case together, ensuring structural integrity and proper alignment of internal components.

1

Transmission Case Bolts

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Tighten in a criss-cross pattern to ensure even clamping force. Estimated value based on similar transmission case bolts.

Valve Body

These bolts secure the valve body to the transmission case. The valve body controls hydraulic pressure and gear selection.

1

Valve Body Mounting Bolts

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Ensure proper seating of the valve body before tightening. Estimated value based on similar M6 bolts into aluminum housing.

Mechatronic Unit

These bolts secure the mechatronic unit (TCU) to the transmission. This unit houses the transmission control module.

1

Mechatronic Unit Mounting Bolts

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Ensure the mechatronic unit is properly aligned. Estimated value based on similar M6 bolts into aluminum housing.

Oil Pan

These bolts secure the transmission oil pan to the transmission case.

1

Transmission Oil Pan Bolts

M6 x 1.0
Torque Value
7 ft-lbs (9.5 N·m)
Important Notes
Use a new gasket or sealant. Tighten in a criss-cross pattern. Estimated value based on similar M6 bolts into aluminum housing.

Drain Plugs

These plugs seal the drain and fill ports for the transmission fluid.

1

Transmission Fluid Drain Plug

M24 x 1.5
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Always use a new crush washer. OEM spec, based on similar drain plugs.
2

Transmission Fluid Fill Plug

M24 x 1.5
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Always use a new crush washer. OEM spec, based on similar fill plugs.

Output Shafts

These bolts connect the output shafts to the transmission, transmitting power to the wheels.

1

Output Shaft Flange Bolts

M10 x 1.5
Important Notes
Tighten to specified torque, then an additional 90-degree angle. Estimated value based on similar high-load flanged shafts. Refer to the service manual for specific torque procedures.

Input Shafts

These bolts connect the input shafts from the engine to the transmission.

1

Input Shaft Flange Bolts

M10 x 1.5
Important Notes
Tighten to specified torque, then an additional 90-degree angle. Estimated value based on similar high-load flanged shafts. Refer to the service manual for specific torque procedures.

Transmission Mounts

These bolts secure the transmission mounts to the transmission case and the chassis.

1

Transmission Mount Bolts (to Transmission Case)

M12 x 1.75
Torque Value
59 ft-lbs (80 N·m)
Important Notes
Estimated value, based on industry standards for M12 bolts in similar mounts. Tighten all bolts to spec before moving onto the subframe.
2

Transmission Mount Bolts (to Subframe/Chassis)

M12 x 1.75
Important Notes
Tighten to specified torque, then an additional 90-degree angle. Estimated value, based on industry standards for M12 bolts in similar mounts. Refer to the service manual for specific torque procedures.

Park Lock Actuator

These bolts secure the park lock actuator mechanism to the transmission housing.

1

Park Lock Actuator Bolts

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Ensure proper alignment of the actuator before tightening. Estimated value based on similar M6 bolts into aluminum housing.

Cooler Lines

These fittings connect the transmission cooler lines to the transmission.

1

External Transmission Cooler Line Fittings

N/A
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Estimated based on similar sized threaded fluid fittings used in similar Audi models. Always use new sealing washers or O-rings.

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 for the DL501 transmission bolts?

Using the correct torque specifications is crucial to ensure proper clamping force on the transmission components. Under-torquing can lead to loosening, leaks, and potential damage from vibration. Over-torquing can strip threads, deform components, and also cause leaks. Precise torque values maintain the integrity of the assembly and the longevity of the transmission.

Q2

Can I reuse the bolts on my DL501 transmission?

While some bolts might appear reusable, many are designed as 'torque-to-yield' (TTY) bolts. These stretch slightly during the initial tightening, and should be replaced every time they are loosened. Reusing TTY bolts can lead to incorrect clamping force and potential failure. Always refer to the vehicle's service manual for bolt replacement recommendations.

Q3

What happens if I overtighten a DL501 transmission bolt?

Overtightening a bolt, especially on a precision component like a DL501 transmission, can cause significant damage. It can strip threads in the aluminum housing or bolt, deform the bolt itself, and apply excessive pressure on the mating surfaces which can result in leaks. In the worst case scenario, it could crack the transmission case. Always double-check torque settings before applying.

Q4

What type of torque wrench should I use for DL501 transmission bolts?

A calibrated, high-quality torque wrench is essential for working on the DL501 transmission. Both click-type and digital torque wrenches are acceptable, but the digital wrench may provide more accuracy. Ensure the wrench's torque range covers the specified values for the bolts you are working on. A 3/8-inch or 1/2-inch drive wrench is commonly sufficient, but verify this based on the application.

Q5

What should I do if a bolt thread is damaged on my DL501 transmission?

Damaged threads require careful attention. Do not force a bolt into damaged threads. Depending on the severity, you might be able to use a thread chaser to clean and repair the threads. However, if the damage is significant or the bolt is stripped, consult a professional. Attempting to repair a stripped thread can damage your transmission if not done correctly, and some cases may require a helicoil or time-sert repair. Ignoring a stripped bolt can cause leaks or failure. If in doubt, consult a professional.

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" Drive)

A calibrated torque wrench capable of accurately measuring torque within the specified range for DL501 transmission bolts.

  • Accurate torque readings
  • 1/2" drive for common sockets
  • Click-type or digital readout
Learn more

Socket Set (Metric)

A set of metric sockets including the necessary sizes for the DL501 transmission bolts (typically 10mm, 13mm, 16mm, 18mm)

  • Multiple socket sizes
  • Durable construction
  • 6-point or 12-point options
Learn more

Extension Bars (1/2" Drive)

Extension bars of various lengths to reach recessed or hard-to-access bolts on the DL501 transmission.

  • Variety of lengths
  • Durable construction
  • Secure attachment
Learn more

Universal Joint (1/2" Drive)

A universal joint adapter to allow for angled access to transmission bolts.

  • Flexibility for tight spots
  • Durable construction
  • Secure attachment
Learn more
Service Procedures

DL501 Transmission Bolt Torque Procedure

Detailed steps for correctly torquing bolts on the DL501 transmission during service or repair.

  • 1. Identify the specific bolts to be torqued according to the service manual (e.g., bell housing bolts, mechatronics unit bolts, oil pan bolts).
  • 2. Consult the Audi service manual or relevant documentation for the correct torque specification for each bolt. Torque values can vary by location on the transmission.
  • 3. Ensure all bolt threads are clean and in good condition. If thread damage is apparent, replace the bolt before proceeding.
  • 4. Install the bolt by hand initially, ensuring it is properly aligned with the threads before applying any significant force.
  • 5. Using the correctly sized socket, attach it to the torque wrench.
  • 6. Set the torque wrench to the specified torque value.
  • 7. Apply the torque slowly and steadily until the torque wrench clicks or reaches the specified value.
  • 8. Do not over-tighten. If using a digital torque wrench, verify that the desired value has been reached.
  • 9. If a torque-to-yield bolt (TTY) is used, follow the specific instructions which may involve a torque plus angle procedure, using an angle measuring tool to meet the specification.
  • 10. Repeat for each bolt following the manufacturer's tightening sequence (if any), as prescribed by the service manual.
  • 11. Re-check torqued bolts after the vehicle has been driven short distance.
View full procedure

DL501 Mechatronics Unit Bolt Torque Procedure

Specific steps for torquing the mechatronics unit bolts on the DL501 transmission.

  • 1. Locate the bolts securing the mechatronics unit to the transmission case.
  • 2. Ensure all contact surfaces between the mechatronics unit and the transmission case are clean and free of debris.
  • 3. Consult the service manual for the exact torque specification for these specific bolts. They often require a specific tightening sequence.
  • 4. Tighten all bolts in stages to achieve the correct torque as specified. Usually done in a cross-pattern fashion.
  • 5. Follow all steps as outlined in the General DL501 Transmission Bolt Torque Procedure.
  • 6. Re-check torque after a short test drive.
View full procedure
Technical Service Bulletins

Potential Mechatronics Unit Bolt Loosening Issue

2020-05-15

Some instances of DL501 transmissions exhibiting mechatronics unit bolt loosening, leading to potential fluid leaks and performance issues.

2018-2019 Audi S6

Resolution: Inspect mechatronics unit bolts during regular service. Replace any bolt showing signs of thread stretch. Ensure proper bolt torque per the service manual, specifically paying attention to torque and angle sequence. Use new replacement bolts for each install. Re-check torque after a test drive.

Updated Torque Specifications for DL501 Transmission Housing Bolts

2021-02-10

Revised torque specifications for certain DL501 transmission housing bolts due to reported cases of leaks and issues with transmission case sealing.

2018-2021 Audi S6

Resolution: Consult the latest Audi service manual for the updated torque specifications. Use a calibrated torque wrench to apply torque correctly. Pay attention to torque sequence and bolt seating prior to tightening. Verify correct part number of replacement bolts are being used.

About the Author

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Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

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