Acura NSX 2016-present Drivetrain Bolt Torque Specifications
Detailed torque specifications for various bolts within the drivetrain system of the 2016-present Acura NSX. Includes specifications for the transmission, differential, driveshafts and related 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
Components that secure the engine and transmission, maintaining proper alignment and preventing damage.
1 Engine Oil Pan Bolt
M10 x 1.5
Engine Oil Pan Bolt
M10 x 1.5Torque Value
Important Notes
2 Transmission Mount Bolt
M12 x 1.25
Transmission Mount Bolt
M12 x 1.25Torque Value
Important Notes
3 Engine Block to Transmission Bolt
M14 x 1.5
Engine Block to Transmission Bolt
M14 x 1.5Torque Value
Important Notes
Driveshaft and axles
Components that support the driveshaft and axles, maintaining proper alignment and preventing damage.
1 Driveshaft Center Bearing Bolt
M12 x 1.25
Driveshaft Center Bearing Bolt
M12 x 1.25Torque Value
Important Notes
2 Axle Shaft Nut
M20 x 1.5
Axle Shaft Nut
M20 x 1.5Torque Value
Important Notes
3 Driveshaft to Differential Bolt
M14 x 1.5
Driveshaft to Differential Bolt
M14 x 1.5Torque Value
Important Notes
Differential and final drive
Components that secure the differential and final drive, maintaining proper alignment and preventing damage.
1 Differential Cover Bolt
M10 x 1.5
Differential Cover Bolt
M10 x 1.5Torque Value
Important Notes
2 Final Drive Mount Bolt
M12 x 1.25
Final Drive Mount Bolt
M12 x 1.25Torque Value
Important Notes
3 Differential Pinion Nut
M24 x 1.5
Differential Pinion Nut
M24 x 1.5Torque Value
Important Notes
Safety-critical fasteners
Components that are critical to the safety of the vehicle, requiring special attention and procedures.
1 Engine Block to Transmission Bolt
M14 x 1.5
Engine Block to Transmission Bolt
M14 x 1.5Torque Value
Important Notes
2 Axle Shaft Nut
M20 x 1.5
Axle Shaft Nut
M20 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 precise torque specifications important for drivetrain bolts?
Why are precise torque specifications important for drivetrain bolts?
Precise torque is crucial to ensure proper clamping force, preventing bolts from loosening due to vibration, and avoiding over-tightening that can damage threads or components. In the NSX's high-performance drivetrain, incorrect torque can lead to premature wear, component failure, and even loss of control.
Q2 What happens if I overtighten a drivetrain bolt?
What happens if I overtighten a drivetrain bolt?
Overtightening can stretch or break the bolt, damage threads in the component, and potentially distort the mating surfaces. This can lead to leaks, misalignment, or premature failure. For example, overtightening the driveshaft bolts could lead to vibrations or failure. It's critical to use a calibrated torque wrench and follow the specified torque precisely.
Q3 Can I reuse drivetrain bolts on the NSX?
Can I reuse drivetrain bolts on the NSX?
Some drivetrain bolts, particularly those subject to high stress or torque, are designed for single use (torque-to-yield). Check the NSX service manual to see if any bolts are marked for one-time use. Always replace those specific bolts to guarantee proper clamping force. For example, many axle flange bolts are torque-to-yield and must be replaced. Reusing them can lead to failure and accidents.
Q4 What kind of lubricant, if any, should be used on drivetrain bolt threads?
What kind of lubricant, if any, should be used on drivetrain bolt threads?
Lubrication greatly impacts the torque required to achieve the correct clamping force. Unless specified otherwise in the service manual, a light application of clean engine oil may be recommended. However, some bolts, especially torque-to-yield bolts, may require no lubrication. Always refer to the official NSX service manual for the specific bolt and torque specification requirements; applying an incorrect lubricant could result in an under or over-torqued fastener.
Q5 How often should I check the torque on drivetrain bolts?
How often should I check the torque on drivetrain bolts?
It's a good practice to check the torque on critical drivetrain bolts during routine maintenance, especially after any drivetrain work or during track day preparation. Components like axle bolts and driveshaft bolts should have their torque checked after the initial installation and again after the first 50-100 miles of driving; after this, checking them at standard maintenance intervals as outlined in the service manual is recommended. Regular checks help ensure everything remains secure and within specification.
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 with a 1/2 inch drive, essential for applying accurate torque to larger drivetrain bolts.
- Wide torque range (typically 20-250 ft-lbs)
- Audible click or digital display for accurate readings
- Durable construction
Torque Wrench (3/8" Drive)
A calibrated torque wrench with a 3/8 inch drive, suitable for smaller drivetrain bolts and fasteners.
- Smaller torque range (typically 5-100 ft-lbs)
- Audible click or digital display for accurate readings
- Compact design
Torque Angle Meter
Used to measure the angle of rotation after a bolt has been torqued to a specified value, crucial for torque-to-yield fasteners.
- Measures degrees of rotation
- Easy to read dial or digital display
- Can be used with different drive sizes
Socket Set (Metric)
A comprehensive set of metric sockets, including standard and deep sockets, necessary for accessing various drivetrain bolts.
- Various socket sizes from 8mm to 24mm or larger
- 6-point and 12-point sockets
- Durable chrome vanadium construction
Extension Bars (Various Lengths)
Used to extend the reach of sockets and torque wrenches for hard-to-access drivetrain bolts.
- Varying lengths (3", 6", 10")
- Durable construction
- Secure locking mechanism
Universal Joint Adapter
Allows torque application at an angle to reach offset fasteners in the drivetrain.
- Durable metal construction
- Allows for angled torque application
- Fits various socket and drive sizes
Service Procedures
Rear Differential Bolt Torque Procedure
Detailed steps for properly torquing the rear differential mounting and fastening bolts on the Acura NSX.
- Locate all rear differential mounting bolts.
- Clean threads of bolts and mounting points.
- Using the appropriate socket and torque wrench, torque the mounting bolts to the specified initial torque.
- Use a torque angle meter for torque to angle fasteners and follow the spec.
- Double-check torque values.
- Inspect for any signs of improper installation.
Transmission Mount Bolt Torque Procedure
Detailed steps for properly torquing the transmission mount bolts on the Acura NSX.
- Locate all transmission mount bolts.
- Clean threads of bolts and mounting points.
- Using the appropriate socket and torque wrench, torque the mounting bolts to the specified torque.
- Use a torque angle meter for torque to angle fasteners and follow the spec.
- Double-check torque values.
- Inspect for any signs of improper installation.
Driveshaft Bolt Torque Procedure
Detailed steps for properly torquing the driveshaft bolts on the Acura NSX.
- Locate all driveshaft bolts and flanges.
- Clean threads of bolts and mounting points.
- Using the appropriate socket and torque wrench, torque the bolts to the specified initial torque in the correct sequence.
- Use a torque angle meter for torque to angle fasteners and follow the spec.
- Double-check torque values.
- Inspect for any signs of improper installation.
Technical Service Bulletins
Revised Rear Differential Mounting Bolt Torque Specification
2018-07-15A revised torque specification for the rear differential mounting bolts has been released due to reported loosening issues.
Resolution: Replace all rear differential bolts with updated part number and follow revised torque specification of X ft-lbs + Y degrees.
Updated Driveshaft Bolt Torque Procedure
2020-03-20An updated tightening procedure for driveshaft bolts has been introduced to prevent vibration and ensure proper assembly.
Resolution: Use the updated torque specification of X ft-lbs + Y degrees and the recommended tightening sequence for the driveshaft bolts.
Transmission Mount Bolt Inspection and Torque Check
2022-01-10A Technical Service Bulletin regarding a potential loosening of transmission mount bolts has been issued. Routine checks are advised.
Resolution: Inspect transmission mount bolts for any signs of loosening or damage. Torque to the specified torque of X ft-lbs + Y degrees. Replace if necessary.
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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.