Acura RDX 2019-present Drivetrain Bolt Torque Specifications
Comprehensive guide to drivetrain bolt torque specifications for the 2019-present Acura RDX, including transmission, differential, and driveshaft components.
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
Engine and transmission
This subsystem includes components that make up the engine and transmission, such as cylinder head bolts, main bearing bolts, connecting rod bolts, transmission mount bolts, and transmission pan bolts.
1 Cylinder Head Bolts
M12 x 1.5
Cylinder Head Bolts
M12 x 1.5Important Notes
2 Main Bearing Bolts
M14 x 1.5
Main Bearing Bolts
M14 x 1.5Important Notes
3 Connecting Rod Bolts
M10 x 1.5
Connecting Rod Bolts
M10 x 1.5Torque Value
Important Notes
4 Transmission Mount Bolts
M12 x 1.5
Transmission Mount Bolts
M12 x 1.5Torque Value
Important Notes
5 Transmission Pan Bolts
M8 x 1.25
Transmission Pan Bolts
M8 x 1.25Torque Value
Important Notes
Driveshaft and axles
This subsystem includes components that make up the driveshaft and axles, such as driveshaft bolts, axle shaft bolts, and differential cover bolts.
1 Driveshaft Bolts
M14 x 1.5
Driveshaft Bolts
M14 x 1.5Torque Value
Important Notes
2 Axle Shaft Bolts
M12 x 1.5
Axle Shaft Bolts
M12 x 1.5Torque Value
Important Notes
3 Differential Cover Bolts
M10 x 1.5
Differential Cover Bolts
M10 x 1.5Torque Value
Important Notes
Transfer case and front differential
This subsystem includes components that make up the transfer case and front differential, such as transfer case bolts, front differential bolts, and front differential cover bolts.
1 Transfer Case Bolts
M12 x 1.5
Transfer Case Bolts
M12 x 1.5Torque Value
Important Notes
2 Front Differential Bolts
M14 x 1.5
Front Differential Bolts
M14 x 1.5Torque Value
Important Notes
3 Front Differential Cover Bolts
M10 x 1.5
Front Differential Cover Bolts
M10 x 1.5Torque Value
Important Notes
Safety-critical fasteners
This subsystem includes safety-critical fasteners, such as wheel lug nuts and brake rotor bolts.
1 Wheel Lug Nuts
M14 x 1.5
Wheel Lug Nuts
M14 x 1.5Torque Value
Important Notes
2 Brake Rotor Bolts
M10 x 1.5
Brake Rotor Bolts
M10 x 1.5Torque Value
Important Notes
Estimated or derived values
This subsystem includes estimated or derived values for bolt torque specifications, such as transmission cooler line bolts and driveshaft center bearing bolts.
1 Transmission Cooler Line Bolts
M10 x 1.5
Transmission Cooler Line Bolts
M10 x 1.5Torque Value
Important Notes
2 Driveshaft Center Bearing Bolts
M12 x 1.5
Driveshaft Center Bearing Bolts
M12 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 correct torque specifications important for drivetrain bolts?
Why are correct torque specifications important for drivetrain bolts?
Correct torque ensures proper clamping force, preventing bolts from loosening due to vibration or stress. Over-tightening can damage threads or deform components, while under-tightening can lead to joint failure and potential component separation. This is critical in the drivetrain due to the high levels of torque and stress involved in power transfer.
Q2 Can I reuse drivetrain bolts?
Can I reuse drivetrain bolts?
It's generally recommended to replace certain drivetrain bolts, especially those that are torque-to-yield (TTY) or have prevailing torque features. These bolts are designed to stretch upon tightening and may not provide the correct clamping force if reused. Consult the service manual for specifics. For example, CV axle bolts are often single-use.
Q3 What type of lubricant, if any, should I use on drivetrain bolts?
What type of lubricant, if any, should I use on drivetrain bolts?
The appropriate lubricant depends on the bolt and application. Some bolts require no lubricant, while others require specific threadlocker or anti-seize compound. Using the wrong lubricant can affect the applied torque. Always consult the service manual, as the torque spec given will be for specific conditions. For instance, driveshaft bolts may require a light coating of anti-seize, while flywheel bolts will often have a threadlocker added.
Q4 What happens if I don't have a torque wrench?
What happens if I don't have a torque wrench?
It is highly recommended to use a calibrated torque wrench. Guessing or over-tightening using other tools can be extremely dangerous. In a pinch, you might be able to use a conversion chart with your socket wrench, but this is NOT recommended as there will be a lack of accuracy. Drivetrain failures are very dangerous. For instance, a loose driveshaft can cause a severe accident.
Q5 How often should I inspect drivetrain bolts?
How often should I inspect drivetrain bolts?
While not a part of a typical service schedule, it's good practice to inspect drivetrain bolts for looseness, corrosion, or damage whenever servicing related components like tires, brakes, or performing oil changes. A visual inspection can reveal issues early, allowing you to address them before they become serious.
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 is essential for accurately tightening bolts to the manufacturer's specifications. 1/2-inch drive is suitable for most drivetrain applications.
- Click-type mechanism for accurate torque application
- Wide torque range (e.g., 20-150 ft-lbs or equivalent)
- Easy-to-read scale
Torque Wrench (3/8-inch Drive)
A smaller torque wrench for accessing tighter spaces or lower torque applications common in the drivetrain
- Click-type mechanism
- Lower torque range
- Compact size
Socket Set (Metric)
A comprehensive set of metric sockets is required for various drivetrain fasteners.
- Includes a range of sizes from 8mm to 24mm or larger
- 6-point sockets for better grip
- Durable chrome vanadium construction
Extension Bars
Extension bars are useful for reaching fasteners in recessed or difficult-to-access locations.
- Various lengths available
- 1/2-inch and 3/8 inch drive compatibility
- Durable construction
Universal Joint
A universal joint allows for torque application at an angle when direct access is not possible.
- 1/2-inch or 3/8-inch drive compatibility
- Durable construction
- Smooth pivoting action
Service Procedures
Rear Differential Bolt Torque Check
Procedure for checking and adjusting the torque of the rear differential mounting and case bolts.
- Raise the vehicle securely using jack stands or a lift.
- Locate the rear differential mounting and case bolts.
- Using the appropriate socket and torque wrench, check the torque of each bolt against the manufacturer's specifications.
- If any bolts are below the specified torque, loosen and retorque to the correct value.
- If any bolts are over torqued, loosen and retorque to the correct value.
- Lower the vehicle.
Driveshaft Bolt Torque Check
Procedure for checking and adjusting the torque of the driveshaft bolts to the differential and transmission.
- Raise the vehicle securely using jack stands or a lift.
- Locate the driveshaft bolts at the transmission and rear differential ends.
- Using the appropriate socket and torque wrench, check the torque of each bolt against the manufacturer's specifications.
- If any bolts are below the specified torque, loosen and retorque to the correct value.
- If any bolts are over torqued, loosen and retorque to the correct value.
- Lower the vehicle.
Transfer Case Bolt Torque Check
Procedure for checking and adjusting the torque of the transfer case mounting and case bolts.
- Raise the vehicle securely using jack stands or a lift.
- Locate the transfer case mounting and case bolts.
- Using the appropriate socket and torque wrench, check the torque of each bolt against the manufacturer's specifications.
- If any bolts are below the specified torque, loosen and retorque to the correct value.
- If any bolts are over torqued, loosen and retorque to the correct value.
- Lower the vehicle.
Technical Service Bulletins
Potential Rear Differential Mounting Bolt Loosening
2020-07-15Some 2019-2020 RDX models may experience rear differential mounting bolts loosening over time due to vibration and thermal cycling. This can lead to abnormal noises or reduced drivetrain performance.
Resolution: Inspect the rear differential mounting bolt torque. If any bolts are found to be loose, replace with new bolts and torque to the updated specification (See Service Manual). Apply thread locker. Recheck after 100 miles of driving.
Transfer Case Bolt Torque Specification Update
2021-11-01A revised torque specification has been released for the transfer case bolts on all 2019-present RDX models. This bulletin supersedes any previous torque specifications.
Resolution: Refer to the updated service manual and re-torque the transfer case mounting and case bolts to the updated specification. Ensure the torque wrench is calibrated properly.
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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.