Acura Integra 1989-1993 Exhaust System Bolt Torque Specifications
Detailed torque specifications for exhaust bolts on 1989-1993 Acura Integra models, including manifold, downpipe, and cat-back connections.
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
Exhaust Manifold Headers
This subsystem includes components that connect the exhaust manifold or headers to the cylinder head and exhaust pipe. Proper torque ensures a tight seal to prevent exhaust leaks, which could affect engine performance and emissions.
1 Exhaust Manifold/Headers to Cylinder Head Bolts
M8 x 1.25
Exhaust Manifold/Headers to Cylinder Head Bolts
M8 x 1.25Torque Value
Important Notes
2 Exhaust Pipe to Exhaust Manifold/Headers Bolts
M8 x 1.25
Exhaust Pipe to Exhaust Manifold/Headers Bolts
M8 x 1.25Torque Value
Important Notes
Catalytic Converter
This subsystem includes components that connect the catalytic converter to the exhaust pipe. Proper torque ensures a tight seal to prevent exhaust leaks and maintain proper emissions control.
1 Catalytic Converter to Exhaust Pipe Bolts
M8 x 1.25
Catalytic Converter to Exhaust Pipe Bolts
M8 x 1.25Torque Value
Important Notes
Muffler
This subsystem includes components that connect the muffler to the exhaust pipe. Proper torque ensures a secure fit, preventing leaks and reducing exhaust noise.
1 Muffler to Exhaust Pipe Bolts
M8 x 1.25
Muffler to Exhaust Pipe Bolts
M8 x 1.25Torque Value
Important Notes
Exhaust Hangers
This subsystem includes bolts that secure the exhaust system to the vehicle's underbody. Proper torque ensures the exhaust system is stable and prevents excessive movement, which could lead to stress fractures or noise.
1 Exhaust Hanger Bolts
M6 x 1.0
Exhaust Hanger Bolts
M6 x 1.0Torque Value
Important Notes
Oxygen Sensor
This subsystem includes the oxygen sensor, which is threaded into the exhaust manifold or pipe. Proper torque ensures a tight seal to prevent exhaust leaks and accurate sensor readings, which are critical for engine performance and emissions control.
1 Oxygen Sensor (O2 Sensor)
M18 x 1.5
Oxygen Sensor (O2 Sensor)
M18 x 1.5Torque Value
Important Notes
Heat Shields
This subsystem includes bolts that secure heat shields to the exhaust system. Proper torque ensures the shields remain securely in place without over-tightening, which could damage the shield or exhaust components.
1 Heat Shield Bolts
M6 x 1.0
Heat Shield Bolts
M6 x 1.0Torque Value
Important Notes
Exhaust Flanges
This subsystem includes bolts that connect sections of the exhaust system via flanges. Proper torque ensures a tight seal and prevents leaks, which could affect emissions and performance.
1 Exhaust Flange Bolts
M8 x 1.25
Exhaust Flange 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 What happens if I overtighten exhaust bolts?
What happens if I overtighten exhaust bolts?
Overtightening exhaust bolts can stretch or break the bolt, damage the threads in the exhaust manifold or other components, and crush the exhaust gasket. This can lead to exhaust leaks, which are noisy and can be dangerous, as well as cause premature wear of other parts. A broken bolt might require drilling out and a retapping of the threads, a very time-consuming process.
Q2 What happens if I undertighten exhaust bolts?
What happens if I undertighten exhaust bolts?
Undertightening exhaust bolts will not properly seal the exhaust system. This can cause exhaust leaks, leading to noise, poor engine performance, and the potential for dangerous fumes to enter the cabin. Additionally, loose bolts can vibrate and eventually fall out, risking damage and requiring immediate attention.
Q3 Do I need to use new exhaust gaskets every time I remove the exhaust system?
Do I need to use new exhaust gaskets every time I remove the exhaust system?
Yes, it is highly recommended to use new exhaust gaskets every time you disconnect and reconnect the exhaust system. Old gaskets can become compressed and may not provide a proper seal when reused, leading to exhaust leaks. It's a small cost to avoid potentially time consuming and dangerous issues.
Q4 Should I use anti-seize on exhaust bolts?
Should I use anti-seize on exhaust bolts?
Yes, applying a thin layer of high-temperature anti-seize compound to exhaust bolt threads is highly recommended. It helps prevent the bolts from seizing or rusting in place, making future removal much easier. In the high-heat environment of an exhaust system, regular bolts can fuse together, leading to severe headaches for future work on your car. Remember to keep it out of the gasket contact surfaces.
Q5 What type of wrench should I use for tightening exhaust bolts?
What type of wrench should I use for tightening exhaust bolts?
A torque wrench is essential for properly tightening exhaust bolts to the specified torque. Using a regular wrench may lead to over or undertightening, and should be avoided when possible. For better access to tight areas, a socket and ratchet is often best suited for the job.
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
A calibrated tool used to apply a specific amount of torque to fasteners.
- Adjustable torque settings
- Click-type or digital readout
Socket Set (Metric)
A set of sockets in various metric sizes to fit exhaust bolts and nuts.
- Various sizes (10mm, 12mm, 14mm)
- Deep and shallow sockets
Wrench Set (Metric)
A set of wrenches in various metric sizes.
- Various sizes (10mm, 12mm, 14mm)
- Open-end and box-end wrenches
Penetrating Oil
A lubricant used to loosen corroded or stuck fasteners.
- Quick-acting formula
- Effective on rust and corrosion
Service Procedures
Exhaust Manifold to Cylinder Head Torque Procedure
Procedure for tightening exhaust manifold bolts to the cylinder head.
- Apply penetrating oil to the exhaust manifold bolts if necessary.
- Start all bolts by hand, ensuring proper alignment.
- Torque bolts to 22 ft-lbs (29 Nm) using a torque wrench in a criss-cross pattern.
- Double check each bolt with the torque wrench.
Exhaust Pipe to Manifold Torque Procedure
Procedure for tightening the exhaust pipe flange to the exhaust manifold.
- Apply penetrating oil to the flange bolts if necessary.
- Start all bolts by hand, ensuring proper alignment.
- Torque bolts to 33 ft-lbs (45 Nm) using a torque wrench in a criss-cross pattern.
- Double check each bolt with the torque wrench.
Exhaust Pipe to Catalytic Converter Torque Procedure
Procedure for tightening bolts connecting the exhaust pipe to the catalytic converter.
- Apply penetrating oil to the bolts if necessary.
- Start all bolts by hand, ensuring proper alignment.
- Torque bolts to 33 ft-lbs (45 Nm) using a torque wrench in a criss-cross pattern.
- Double check each bolt with the torque wrench.
Catalytic Converter to Muffler Torque Procedure
Procedure for tightening the bolts connecting the catalytic converter to the muffler.
- Apply penetrating oil to the bolts if necessary.
- Start all bolts by hand, ensuring proper alignment.
- Torque bolts to 33 ft-lbs (45 Nm) using a torque wrench in a criss-cross pattern.
- Double check each bolt with the torque wrench.
Muffler to Tailpipe Torque Procedure
Procedure for tightening the bolts connecting the muffler to the tailpipe.
- Apply penetrating oil to the bolts if necessary.
- Start all bolts by hand, ensuring proper alignment.
- Torque bolts to 28 ft-lbs (38 Nm) using a torque wrench.
- Double check each bolt with the torque wrench.
Technical Service Bulletins
Exhaust Manifold Bolt Corrosion
1992-06-15Technical bulletin regarding instances of severe corrosion on exhaust manifold bolts, particularly in regions with high road salt usage.
Resolution: Inspect exhaust manifold bolts for corrosion. Replace with new, high-quality bolts and use anti-seize compound if necessary.
Exhaust Flange Gasket Leakage
1991-03-01Technical bulletin addressing premature failure and leakage of exhaust flange gaskets, resulting in exhaust noise and potential leaks.
Resolution: Replace exhaust flange gaskets with genuine Acura parts. Ensure proper torque application during installation to prevent further leakage.
Loose Exhaust System Hangers
1990-11-20Technical bulletin regarding reports of loose exhaust system hangers, which can cause rattling and potential exhaust damage. Note, this is not about bolt torque directly.
Resolution: Inspect exhaust hangers for damage or looseness. Tighten or replace as needed. Ensure exhaust system has proper clearance to prevent further issues.
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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.