Audi Audi Q8 2018-present DL382 Transmission Torque Specifications
Detailed torque specifications for all bolts used in the DL382 transmission found in the 2018-Present Audi Q8, including housing, pan, and valve body bolts.
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 Housing
Specifications for bolts securing the main transmission case halves.
1 Main Case Halves Bolts
M10 x 1.5
Main Case Halves Bolts
M10 x 1.5Important Notes
Mechatronic Unit
Specifications for bolts securing the Mechatronic Unit (Valve Body).
1 Mechatronic Unit Mounting Bolts
M6 x 1.0
Mechatronic Unit Mounting Bolts
M6 x 1.0Torque Value
Important Notes
Oil Pan
Specifications for bolts related to the transmission oil pan.
1 Transmission Oil Pan Bolts
M6 x 1.0
Transmission Oil Pan Bolts
M6 x 1.0Torque Value
Important Notes
2 Transmission Oil Pan Drain Plug
M14 x 1.5
Transmission Oil Pan Drain Plug
M14 x 1.5Torque Value
Important Notes
3 Transmission Fill Plug
M14 x 1.5
Transmission Fill Plug
M14 x 1.5Torque Value
Important Notes
Shaft Housings
Specifications for bolts securing the input and output shaft housings.
1 Input Shaft Housing Bolts
M8 x 1.25
Input Shaft Housing Bolts
M8 x 1.25Important Notes
2 Output Shaft Housing Bolts
M8 x 1.25
Output Shaft Housing Bolts
M8 x 1.25Important Notes
Differential
Specifications for bolts securing the internal differential housing.
1 Differential Housing Bolts (Internal)
M10 x 1.5
Differential Housing Bolts (Internal)
M10 x 1.5Important Notes
Transfer Case
Specifications for bolts securing the transfer case to the transmission.
1 Transfer Case Mounting Bolts
M10 x 1.5
Transfer Case Mounting Bolts
M10 x 1.5Important Notes
Transmission Mounts
Specifications for bolts securing the transmission mounts.
1 Transmission Mount Bolts (Body Side)
M12 x 1.75
Transmission Mount Bolts (Body Side)
M12 x 1.75Important Notes
2 Transmission Mount Bolts (Transmission Side)
M12 x 1.75
Transmission Mount Bolts (Transmission Side)
M12 x 1.75Important Notes
Sensors And Modules
Specifications for bolts securing sensors and electronic control modules.
1 Speed Sensor Bolts
M6 x 1.0
Speed Sensor Bolts
M6 x 1.0Torque Value
Important Notes
2 Transmission Control Module (TCM) Mounting Bolts
M6 x 1.0
Transmission Control Module (TCM) Mounting Bolts
M6 x 1.0Torque Value
Important Notes
Clutch Actuator
Specifications for bolts securing the clutch actuator to the transmission.
1 Clutch Actuator Mounting Bolts
M8 x 1.25
Clutch Actuator Mounting Bolts
M8 x 1.25Torque Value
Important Notes
Oil Cooler Lines
Specifications for bolts securing the oil cooler lines to the transmission.
1 Oil Cooler Line Fittings (Transmission Side)
M18 x 1.5
Oil Cooler Line Fittings (Transmission Side)
M18 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 What happens if I overtighten a DL382 transmission bolt?
What happens if I overtighten a DL382 transmission bolt?
Overtightening can stretch or weaken the bolt, potentially causing it to break later, leading to leaks or component failure. It can also damage the threads in the transmission casing, necessitating costly repairs like thread inserts or casing replacement. For example, overtightening the pan bolts can warp the transmission pan and cause leaks.
Q2 What happens if I undertighten a DL382 transmission bolt?
What happens if I undertighten a DL382 transmission bolt?
Undertightening can lead to loosening of the bolt over time, resulting in fluid leaks, vibration, and potential damage to the transmission. In extreme cases, the component may separate, causing severe damage and potentially dangerous situations. For instance, undertightened bellhousing bolts can cause misalignment and eventual component separation.
Q3 Are torque-to-yield (TTY) bolts used in the DL382 transmission, and if so, should they be replaced?
Are torque-to-yield (TTY) bolts used in the DL382 transmission, and if so, should they be replaced?
Yes, some bolts in the DL382 transmission are TTY bolts. These are designed to stretch upon tightening and should always be replaced when loosened as they lose their clamping force and structural integrity after being used once. They cannot be reused reliably. For example, some internal component fasteners are TTY.
Q4 Should I use threadlocker on DL382 transmission bolts?
Should I use threadlocker on DL382 transmission bolts?
It depends on the specific bolt and location. While some bolts may require threadlocker as specified by Audi (usually a medium-strength threadlocker like Loctite 243), many do not. Consult the repair manual for specific guidance on which bolts require threadlocker. Applying threadlocker when not specified can cause issues with future disassembly. For example, most external casing bolts don't require threadlocker, while internal valve body fasteners may benefit from it.
Q5 How often should I check the torque of my DL382 transmission bolts?
How often should I check the torque of my DL382 transmission bolts?
Unless you are routinely performing maintenance on the transmission or have experienced a specific issue, regular torque checks are generally not required. However, if you notice fluid leaks or unusual noises, checking torque values should be a part of your diagnostic process. Always re-torque fasteners to spec after major component work.
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 inch drive)
A calibrated torque wrench capable of measuring torque values within the specified range for the DL382 transmission bolts.
- Click-type mechanism for accurate readings
- Wide torque range
Torque Wrench (3/8 inch drive)
A calibrated torque wrench with a 3/8 drive for smaller bolts or fasteners.
- Click-type mechanism for accurate readings
- Suitable for tighter spaces
Socket Set (Metric)
A comprehensive set of metric sockets to fit all DL382 transmission bolts.
- Various sizes to accommodate different bolt heads
- Durable construction
Extension Bars
Extension bars of various lengths to access recessed bolts.
- Provides reach for difficult areas
- Ensures proper alignment
Universal Joint
Allows for angled access to bolts
- Provides access to bolts at an angle
- Durable construction
Service Procedures
DL382 Transmission Mechatronics Unit Bolt Torque Procedure
Procedure for torquing the bolts securing the mechatronics unit to the DL382 transmission housing. This should only be done on a cold transmission.
- Locate the mechatronics unit bolts on the DL382 transmission housing.
- Using the appropriate socket and torque wrench, tighten each bolt to 10 Nm (7.4 ft-lbs) in a crisscross pattern.
- Then increase to 20 Nm (14.7 ft-lbs) using the same crisscross pattern.
- Finally tighten to 30 Nm (22 ft-lbs) using the same crisscross pattern.
- Verify all bolts are torqued to the final specification.
DL382 Transmission Oil Pan Bolt Torque Procedure
Procedure for torquing the bolts securing the transmission oil pan to the DL382 transmission housing. This should only be done on a cold transmission.
- Locate all oil pan bolts on the DL382 transmission housing.
- Using the appropriate socket and torque wrench, tighten all bolts to 10 Nm (7.4 ft-lbs) in a crisscross pattern.
- Then tighten to 25 Nm (18.4 ft-lbs) using the same crisscross pattern.
- Verify all bolts are torqued to the final specification.
DL382 Transmission Housing Bolt Torque Procedure
Procedure for torquing the main housing bolts on the DL382 transmission. This procedure is used during transmission disassembly and reassembly. This should only be done on a cold transmission.
- Locate all main housing bolts on the DL382 transmission housing.
- Using the appropriate socket and torque wrench, tighten all bolts to 15 Nm (11 ft-lbs) in a crisscross pattern.
- Then tighten to 30 Nm (22 ft-lbs) using the same crisscross pattern.
- Verify all bolts are torqued to the final specification.
Technical Service Bulletins
DL382 Transmission Mechatronics Unit Bolt Loosening
2021-05-15Some 2018-2020 Audi Q8 vehicles with the DL382 transmission may exhibit mechatronics unit bolt loosening due to thermal expansion and contraction over time.
Resolution: Inspect and retorque the mechatronics unit bolts to the specified torque. Apply thread-locking compound if necessary. Check for updates to the mechatronics unit program.
DL382 Transmission Oil Leak at Oil Pan
2020-11-01Certain 2019-2021 Audi Q8 models equipped with the DL382 transmission have experienced oil leaks from the transmission oil pan due to improper bolt torque or gasket issues.
Resolution: Verify the oil pan bolts are torqued to specification. Inspect and replace the oil pan gasket and bolts as needed. Ensure the sealing surface is clean before reassembly.
DL382 Transmission Housing Bolt Fatigue
2022-08-20Some 2018-2022 Audi Q8 vehicles may have experienced transmission housing bolt fatigue resulting in potential leaks.
Resolution: Inspect and replace all transmission housing bolts. Ensure that each bolt is torqued to specification after replacement.
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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.