Acura NSX 1990-2005 Drivetrain Bolt Torque Specifications
This page provides detailed torque specifications for various bolts within the drivetrain of the 1990-2005 Acura NSX, including transmission, differential, driveshaft, and axle 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 Flywheel
Torque specifications for the flywheel and related components.
1 Flywheel Bolts
M10 x 1.25
Flywheel Bolts
M10 x 1.25Torque Value
Important Notes
Clutch
Torque specifications for the clutch components.
1 Clutch Pressure Plate Bolts
M8 x 1.25
Clutch Pressure Plate Bolts
M8 x 1.25Torque Value
Important Notes
Transmission
Torque specifications for the transmission and related components.
1 Transmission Mounting Bolts
M12 x 1.75
Transmission Mounting Bolts
M12 x 1.75Torque Value
Important Notes
2 Transmission Oil Pan Bolts
M6 x 1.0
Transmission Oil Pan Bolts
M6 x 1.0Torque Value
Important Notes
3 Transmission Drain and Fill Plugs
M18 x 1.5
Transmission Drain and Fill Plugs
M18 x 1.5Torque Value
Important Notes
4 Transmission Fluid Drain/Fill Plug
M18 x 1.5
Transmission Fluid Drain/Fill Plug
M18 x 1.5Torque Value
Important Notes
Driveshaft
Torque specifications for the driveshaft and related components.
1 Propeller/Drive Shaft Bolts
M10 x 1.25
Propeller/Drive Shaft Bolts
M10 x 1.25Torque Value
Important Notes
2 Driveshaft Center Support Bearing Bolts
M10 x 1.5
Driveshaft Center Support Bearing Bolts
M10 x 1.5Torque Value
Important Notes
Drive Axles
Torque specifications for the drive axles and related components.
1 Drive Axle/Half Shaft Bolts
M10 x 1.25
Drive Axle/Half Shaft Bolts
M10 x 1.25Torque Value
Important Notes
2 CV Joint/Axle Nut
M22 x 1.5
CV Joint/Axle Nut
M22 x 1.5Torque Value
Important Notes
Differential
Torque specifications for the differential and related components.
1 Differential Mounting Bolts
M12 x 1.75
Differential Mounting Bolts
M12 x 1.75Torque Value
Important Notes
2 Differential Drain/Fill Plug
M18 x 1.5
Differential Drain/Fill Plug
M18 x 1.5Torque Value
Important Notes
Transfer Case
Torque specifications for the transfer case and related components.
1 Transfer Case Drain/Fill Plug
M18 x 1.5
Transfer Case Drain/Fill Plug
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 Why is using the correct torque specifications important for drivetrain bolts?
Why is using the correct torque specifications important for drivetrain bolts?
Using the correct torque ensures proper clamping force, preventing bolts from loosening due to vibration or stress. Over-torquing can damage threads or warp components, while under-torquing can lead to joint failure. For instance, an improperly torqued axle nut can cause wheel wobble and eventual damage to the hub and bearings.
Q2 Should I use lubricant on drivetrain bolts before torquing?
Should I use lubricant on drivetrain bolts before torquing?
Generally, unless specified by Acura, you should not lubricate drivetrain bolts. Lubrication changes the friction, and consequently, the torque value. However, some bolts may require a thread sealant or anti-seize compound in specific applications, which will be stated in Acura service manuals. For example, anti-seize is often used on exhaust hardware to prevent corrosion. Always consult the service manual for specific recommendations.
Q3 What type of torque wrench should I use for drivetrain components?
What type of torque wrench should I use for drivetrain components?
A calibrated click-type torque wrench is generally recommended. Ensure the wrench's torque range covers the required specifications. Using a torque wrench with too wide of a range might not provide the necessary accuracy for lower torque values. A digital torque wrench can also be used but should also be properly calibrated. Make sure to re-calibrate your torque wrench periodically.
Q4 What if I don't have the precise torque specifications for a particular bolt?
What if I don't have the precise torque specifications for a particular bolt?
It is crucial to find the exact torque specification. Refer to an official Acura NSX service manual for your specific year. Guessing or using general torque values can have detrimental consequences. If you cannot find a specification, consult a professional mechanic or Acura specialist rather than risking damage.
Q5 How often should I check the torque on drivetrain bolts?
How often should I check the torque on drivetrain bolts?
Drivetrain bolts should be checked when first installed after about 100-200 miles of driving, as a lot of settling can occur. Afterwards, bolts should be inspected at regular maintenance intervals, such as every oil change or annually, or when any work is performed on drivetrain components. In harsh or high-performance driving conditions, it is prudent to check them more frequently, as vibrations and thermal expansion can loosen fasteners more quickly.
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 high-quality torque wrench with a range suitable for drivetrain components. Essential for accurate bolt tightening.
- Click-type mechanism for accurate readings
- Wide torque range (e.g., 20-150 ft-lbs)
- Easy-to-read scale
Torque Wrench (3/8" Drive)
A smaller torque wrench for lower torque applications and tighter spaces.
- Click-type mechanism for accurate readings
- Suitable range (e.g., 5-80 ft-lbs)
- Compact design
Socket Set (Metric)
A comprehensive set of metric sockets in 1/2" and 3/8" drive sizes, including deep sockets.
- Variety of sizes for different bolt heads
- Durable construction
- Includes common sizes for NSX drivetrain
Extension Bars
Various length extension bars to access hard-to-reach bolts and nuts.
- Different lengths for versatility
- Strong and durable
- Works with 1/2" and 3/8" drive tools
Universal Joint
Allows access to bolts at awkward angles.
- 1/2" and 3/8" drive options
- High-quality construction
- Smooth swivel action
Torque Angle Meter
For applications requiring torque-to-yield fasteners. Measures angle of rotation after initial torque.
- Accurate angle measurement
- Easy-to-read display
- Can be used with various drive sizes
Service Procedures
Transmission Mount Bolt Torque Procedure
Detailed procedure for torquing transmission mount bolts, ensuring proper drivetrain alignment and stability.
- Locate the transmission mount bolts.
- Clean all bolt threads.
- Apply the specified torque to each bolt (refer to service manual).
- Use a torque wrench to ensure accurate torque.
- Recheck torque after initial drive cycle.
Driveshaft Bolt Torque Procedure
Procedure for torquing driveshaft bolts to the correct specification to ensure proper connection and balance.
- Locate driveshaft bolts at both transmission and hub ends.
- Clean all bolt threads.
- Apply the specified torque to each bolt (refer to service manual).
- Use a torque wrench to ensure accurate torque.
- Recheck torque after initial drive cycle.
Differential Mounting Bolt Torque Procedure
Procedure for torquing differential mounting bolts to the specified torque for optimal performance and reduced vibrations.
- Locate differential mounting bolts.
- Clean all bolt threads.
- Apply the specified torque to each bolt (refer to service manual).
- Use a torque wrench to ensure accurate torque.
- Recheck torque after initial drive cycle.
Clutch Pressure Plate Bolt Torque Procedure
Procedure for torquing the clutch pressure plate bolts to ensure proper clamping force and clutch engagement.
- Loosen pressure plate bolts in a star pattern
- Clean all bolt threads.
- Tighten all pressure plate bolts to specified torque in a star pattern.
- Use a torque wrench to ensure accurate torque.
Technical Service Bulletins
Updated Torque Specs for Rear Differential Mounting Bolts
1998-05-15A service bulletin revising the recommended torque specification for the rear differential mounting bolts due to reports of premature wear and looseness.
Resolution: Use the revised torque specifications detailed in the updated service manual. Apply thread locker to bolt threads.
Driveshaft Bolt Inspection and Torque Re-Check
2003-11-20A technical bulletin advising periodic inspection and torque re-check of driveshaft bolts due to potential loosening over time. Use specified thread locker.
Resolution: Visually inspect driveshaft bolts for any signs of damage or looseness. Re-torque to spec and use thread locker.
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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.