Acura NSX 1990-2005 Suspension Bolt Torque Specifications
This page provides detailed torque specifications for suspension bolts on the 1990-2005 Acura NSX, including front and rear suspension components. Ensure proper torquing for safe and optimal performance.
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
Front Suspension
Torque specifications for front suspension components.
1 Strut/Shock Absorber Mounting Bolts
M12 x 1.25
Strut/Shock Absorber Mounting Bolts
M12 x 1.25Torque Value
Important Notes
2 Upper Control Arm Mount Bolts (to Frame)
M12 x 1.25
Upper Control Arm Mount Bolts (to Frame)
M12 x 1.25Torque Value
Important Notes
3 Front Lower Control Arm Ball Joint Pinch Bolt
M10 x 1.25
Front Lower Control Arm Ball Joint Pinch Bolt
M10 x 1.25Torque Value
Important Notes
4 Steering Knuckle to Strut Bolts/Nuts
M12 x 1.25
Steering Knuckle to Strut Bolts/Nuts
M12 x 1.25Torque Value
Important Notes
5 Control Arm Bolts
M14 x 1.5
Control Arm Bolts
M14 x 1.5Torque Value
Important Notes
6 Ball Joint Nut
M12 x 1.25
Ball Joint Nut
M12 x 1.25Torque Value
Important Notes
7 Tie Rod End Nut
M10 x 1.25
Tie Rod End Nut
M10 x 1.25Torque Value
Important Notes
8 Sway Bar Link Nut
M10 x 1.25
Sway Bar Link Nut
M10 x 1.25Torque Value
Important Notes
Rear Suspension
Torque specifications for rear suspension components.
1 Rear Lower Control Arm Ball Joint Pinch Bolt
M10 x 1.25
Rear Lower Control Arm Ball Joint Pinch Bolt
M10 x 1.25Torque Value
Important Notes
2 Rear Trailing Arm Bolts
M14 x 1.5
Rear Trailing Arm Bolts
M14 x 1.5Torque Value
Important Notes
Sway Bar
Torque specifications for sway bar components.
1 Sway Bar Mounting Bracket Bolts
M8 x 1.25
Sway Bar Mounting Bracket Bolts
M8 x 1.25Torque 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 specification so important for suspension bolts?
Why is using the correct torque specification so important for suspension bolts?
Using the correct torque ensures proper clamping force, preventing loosening or failure of components. Over-tightening can damage threads or the component itself, while under-tightening can cause movement, leading to wear, noise, and potentially dangerous situations. It also affects the alignment of the vehicle.
Q2 What happens if I over-torque a suspension bolt?
What happens if I over-torque a suspension bolt?
Over-torquing can stretch or yield the bolt, reducing its clamping force and making it prone to failure. It can also damage threads in the component or mounting location, requiring expensive repairs. This can lead to unexpected suspension failure, creating a serious safety risk. For example, a broken control arm bolt could cause loss of control.
Q3 What happens if I under-torque a suspension bolt?
What happens if I under-torque a suspension bolt?
Under-torquing leads to insufficient clamping force, which allows components to move and shift. This can cause noises, premature wear on bushings and other components, and can negatively impact vehicle handling and alignment. For example, a loose ball joint could lead to excessive play and erratic steering.
Q4 Should I use threadlocker on suspension bolts?
Should I use threadlocker on suspension bolts?
Threadlocker, like Loctite, is often recommended on specific suspension bolts, especially those prone to loosening due to vibration or repeated stress. Consult your NSX repair manual for details. Always follow the instructions provided with the threadlocker product. In some areas, a new bolt may be required. For example, some control arm bolts are one-time use.
Q5 Do I need to replace bolts after removing them?
Do I need to replace bolts after removing them?
Some suspension bolts, especially those that are torque-to-yield (TTY) or have a prevailing torque feature, must be replaced after removal to ensure proper clamping force and prevent failure. These bolts will often be noted in the service manual. Control arm bolts, brake caliper bolts, and strut mount bolts are commonly replaced.
Q6 Are there any special considerations when torquing aluminum components in the suspension?
Are there any special considerations when torquing aluminum components in the suspension?
Yes. Aluminum components are softer than steel and can be damaged by over-torquing. Use a properly calibrated torque wrench and follow torque specifications closely. Applying too much force can cause the threads to strip or even crack the aluminum component. In some cases, lubrication may be needed for accurate torque readings.
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 applying accurate torque to suspension bolts.
- Wide torque range (typically 20-250 ft-lbs)
- Click-type mechanism for accurate torque application
- Durable construction
Torque Wrench (3/8" Drive)
A smaller torque wrench for lower torque suspension bolts and smaller fasteners.
- Lower torque range (typically 5-80 ft-lbs)
- Click-type mechanism for accurate torque application
- Compact design for access
Socket Set (Metric)
A comprehensive set of metric sockets is needed for various suspension bolt sizes.
- Various sizes from 10mm to 24mm
- 6-point design for secure grip
- Durable chrome vanadium steel
Wrench Set (Metric)
A set of metric wrenches for holding nuts while tightening bolts.
- Various sizes from 10mm to 24mm
- Open-end and box-end combination
- Durable construction
Extension Bars
Various lengths of extension bars are necessary for reaching recessed bolts.
- 1/2" and 3/8" drive sizes
- Multiple length options
- Durable construction
Breaker Bar
A breaker bar provides extra leverage for loosening stubborn bolts.
- 1/2" drive
- Long handle for maximum leverage
- Durable construction
Jack and Jack Stands
Essential for safely lifting and supporting the vehicle.
- Rated for vehicle weight
- Stable and secure support
- Multiple height settings
Service Procedures
Front Upper Control Arm Bolt Torque
Procedure for torquing the upper control arm bolts on the front suspension.
- Raise the vehicle and secure it on jack stands.
- Locate the upper control arm bolts.
- Using the appropriate socket, tighten bolts to 47 ft-lbs (64 Nm).
- Verify torque with the torque wrench.
- Lower the vehicle.
Front Lower Control Arm Bolt Torque
Procedure for torquing the lower control arm bolts on the front suspension.
- Raise the vehicle and secure it on jack stands.
- Locate the lower control arm bolts.
- Using the appropriate socket, tighten bolts to 80 ft-lbs (108 Nm).
- Verify torque with the torque wrench.
- Lower the vehicle.
Rear Upper Control Arm Bolt Torque
Procedure for torquing the upper control arm bolts on the rear suspension.
- Raise the vehicle and secure it on jack stands.
- Locate the rear upper control arm bolts.
- Using the appropriate socket, tighten bolts to 47 ft-lbs (64 Nm).
- Verify torque with the torque wrench.
- Lower the vehicle.
Rear Lower Control Arm Bolt Torque
Procedure for torquing the lower control arm bolts on the rear suspension.
- Raise the vehicle and secure it on jack stands.
- Locate the rear lower control arm bolts.
- Using the appropriate socket, tighten bolts to 80 ft-lbs (108 Nm).
- Verify torque with the torque wrench.
- Lower the vehicle.
Front Shock Absorber Upper Mount Bolt Torque
Procedure for torquing the upper shock absorber mount bolts on the front suspension.
- Raise the vehicle and secure it on jack stands.
- Locate the upper shock absorber mount bolts.
- Using the appropriate socket, tighten bolts to 28 ft-lbs (38 Nm).
- Verify torque with the torque wrench.
- Lower the vehicle.
Rear Shock Absorber Upper Mount Bolt Torque
Procedure for torquing the upper shock absorber mount bolts on the rear suspension.
- Raise the vehicle and secure it on jack stands.
- Locate the upper shock absorber mount bolts.
- Using the appropriate socket, tighten bolts to 28 ft-lbs (38 Nm).
- Verify torque with the torque wrench.
- Lower the vehicle.
Technical Service Bulletins
Suspension Bolt Retorque Recommendation
1995-06-15A technical bulletin issued recommending retorquing suspension bolts after the first 1000 miles following any suspension work.
Resolution: After suspension work, drive 1000 miles, then re-torque all suspension bolts to their specified values
Lower Control Arm Bolt Replacement
2001-03-20A technical bulletin indicating a batch of lower control arm bolts may be prone to corrosion. Recommended replacing these bolts when servicing the suspension.
Resolution: Replace lower control arm bolts when servicing or replacing suspension components to prevent potential bolt failure due to corrosion.
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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.