Audi Audi S5 2017-present DL501 Transmission Torque Specifications
Detailed torque specifications for all bolts on the DL501 transmission found in the 2017-Present Audi S5 (B9 and B9.5 generations). Includes both transmission case bolts and other associated component 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 Mounting
Bolts securing the transmission to the engine block and chassis.
1 Engine to Transmission Mounting Bolts
M12 x 1.5
Engine to Transmission Mounting Bolts
M12 x 1.5Important Notes
2 Transmission Mount Bolts (Transmission to Chassis)
M10 x 1.5
Transmission Mount Bolts (Transmission to Chassis)
M10 x 1.5Important Notes
Mechatronic Unit
Bolts related to the internal control unit (Mechatronic) within the transmission.
1 Mechatronic Unit Housing Bolts
M6 x 1.0
Mechatronic Unit Housing Bolts
M6 x 1.0Torque Value
Important Notes
2 Mechatronic Connector Bolts
M5 x 0.8
Mechatronic Connector Bolts
M5 x 0.8Torque Value
Important Notes
Valve Body
Bolts securing the valve body to the transmission housing.
1 Valve Body Bolts
M6 x 1.0
Valve Body Bolts
M6 x 1.0Torque Value
Important Notes
Transmission Pan
Bolts securing the transmission pan to the transmission housing.
1 Transmission Pan Drain Plug
M8 x 1.25
Transmission Pan Drain Plug
M8 x 1.25Torque Value
Important Notes
2 Transmission Pan Perimeter Bolts
M6 x 1.0
Transmission Pan Perimeter Bolts
M6 x 1.0Torque Value
Important Notes
Driveshaft And Torque Converter
Bolts connecting the driveshaft and torque converter to the transmission.
1 Driveshaft Flange Bolts (Transmission Side)
M10 x 1.5
Driveshaft Flange Bolts (Transmission Side)
M10 x 1.5Torque Value
Important Notes
2 Torque Converter Bolts
M8 x 1.25
Torque Converter Bolts
M8 x 1.25Torque Value
Important Notes
Oil Pump And Sensors
Bolts securing the oil pump and speed sensors.
1 Oil Pump Housing Bolts
M6 x 1.0
Oil Pump Housing Bolts
M6 x 1.0Torque Value
Important Notes
2 Input Shaft Speed Sensor Bolt
M6 x 1.0
Input Shaft Speed Sensor Bolt
M6 x 1.0Torque Value
Important Notes
3 Output Shaft Speed Sensor Bolt
M6 x 1.0
Output Shaft Speed Sensor Bolt
M6 x 1.0Torque 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 What happens if I overtighten the transmission bolts?
What happens if I overtighten the transmission bolts?
Overtightening bolts on the DL501 transmission can lead to several issues. You risk stripping the threads in the transmission case or the bolt itself, weakening the clamping force, and potentially causing leaks due to distortion of the mating surfaces. In severe cases, bolt breakage can occur. For example, overtightening the valve body bolts could cause valve body warping and transmission malfunction, requiring costly repairs.
Q2 Can I reuse the transmission bolts?
Can I reuse the transmission bolts?
Generally, it's recommended to replace transmission bolts, especially those that are torque-to-yield (TTY). TTY bolts are designed to stretch slightly when torqued and provide consistent clamping force. Reusing them may result in inaccurate torque readings and reduced clamping force, potentially leading to leaks or component failure. For instance, the transmission pan bolts on a DL501 are commonly replaced due to their TTY design, ensuring a secure and leak-free seal.
Q3 Why are there different torque specifications for different bolts on the DL501?
Why are there different torque specifications for different bolts on the DL501?
Different bolts on the DL501 transmission serve different purposes and are of varying materials and sizes. Therefore, they require unique torque specifications to achieve proper clamping force without causing damage. For example, the Mechatronic unit bolts require a precise, lower torque due to the sensitivity of the unit, while the transmission mount bolts need higher torque to bear the load and vibrations effectively. Using the wrong torque can lead to component damage or failure.
Q4 Do I need special tools to torque the DL501 bolts?
Do I need special tools to torque the DL501 bolts?
Yes, a calibrated torque wrench is essential for accurately tightening the bolts to the specified torque. Using a non-calibrated wrench or relying on 'feel' can lead to undertightening or overtightening. Depending on accessibility, you might also require extensions or specialized sockets. A digital torque wrench is highly recommended for ensuring precision, especially for sensitive components like the Mechatronic unit.
Q5 Should I apply threadlocker to the DL501 transmission bolts?
Should I apply threadlocker to the DL501 transmission bolts?
Generally, threadlocker is not recommended for the majority of DL501 transmission bolts unless specified by Audi's service procedures. Applying threadlocker where it isn't needed can affect torque readings and cause issues in future removals. However, certain bolts, such as those used in areas subject to vibration, may benefit from a manufacturer-approved low-strength threadlocker when explicitly specified. Always follow Audi's repair manual guidelines for the specific bolt you are working with.
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 accurate bolt tightening.
- Precise torque application
- Click-style mechanism for audible confirmation
- Range suitable for DL501 transmission bolts
Torque Wrench (3/8" Drive)
A calibrated torque wrench is essential for accurate bolt tightening, smaller drive for smaller bolts.
- Precise torque application
- Click-style mechanism for audible confirmation
- Range suitable for DL501 transmission bolts
Socket Set (Metric)
A comprehensive socket set to fit various bolt head sizes on the DL501 transmission.
- Various sizes for different bolts
- Durable construction for repeated use
- Deep sockets may be required
Extension Bars
Extension bars provide extra reach when working on the transmission.
- Various lengths for different needs
- Secure connection to sockets and wrenches
- Allows access to recessed bolts
Universal Joint
A universal joint enables access to bolts at angles.
- Allows for angled bolt access
- Durable construction for repeated use
- Compatible with socket sets and torque wrench
Service Procedures
DL501 Transmission Mechatronic Unit Bolt Tightening
This procedure outlines the steps to properly torque the bolts on the DL501 transmission mechatronic unit.
- Locate all mechatronic unit bolts.
- Using the specified metric socket, hand-thread all bolts until snug.
- Refer to the manufacturer's specification for the correct torque value.
- Using a calibrated torque wrench, tighten each bolt to the specified torque value in a star pattern.
- Recheck all bolts to ensure correct torque.
DL501 Transmission Oil Pan Bolt Tightening
This procedure outlines the steps to properly torque the bolts securing the oil pan to the DL501 transmission.
- Locate all transmission oil pan bolts.
- Using the specified metric socket, hand-thread all bolts until snug.
- Refer to the manufacturer's specification for the correct torque value.
- Using a calibrated torque wrench, tighten each bolt to the specified torque value in a sequence.
- Recheck all bolts to ensure correct torque.
DL501 Transmission Housing Bolt Tightening
This procedure outlines the steps to properly torque the bolts securing the transmission housing components
- Locate all transmission housing bolts.
- Using the specified metric socket, hand-thread all bolts until snug.
- Refer to the manufacturer's specification for the correct torque value.
- Using a calibrated torque wrench, tighten each bolt to the specified torque value in a sequence.
- Recheck all bolts to ensure correct torque.
Technical Service Bulletins
DL501 Transmission Mechatronic Bolt Loosening
2021-05-10Some instances of loose mechatronic unit bolts have been reported on the DL501 transmission, requiring a re-torque process.
Resolution: Inspect mechatronic unit bolts, re-torque to specification, use new bolts as needed.
DL501 Transmission Oil Leak at Pan Gasket
2022-09-15Reports of transmission oil leaks at the oil pan gasket on some DL501 transmissions. Improper torque or reuse of bolts is suspected.
Resolution: Inspect oil pan bolts, replace gasket and bolts, and torque to specification with new bolts.
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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.