Acura Integra 1985-1989 Exhaust System Bolt Torque Specifications
Detailed torque specifications for exhaust manifold, downpipe, and exhaust system bolts on the 1985-1989 Acura Integra (First Generation). Includes torque values in foot-pounds and Newton-meters.
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 is critical to prevent exhaust leaks and ensure optimal engine performance.
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 bolts that secure the catalytic converter to the exhaust pipe. Proper torque ensures exhaust flow efficiency and catalytic converter functionality.
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 bolts that attach the muffler to the exhaust pipe. Proper torque ensures a secure connection and prevents noise and leaks.
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 hangers to the vehicle frame or body. Proper torque ensures the exhaust system remains stable and reduces movement.
1 Exhaust Hanger Bolts
M6 x 1.0
Exhaust Hanger Bolts
M6 x 1.0Torque Value
Important Notes
Oxygen Sensors
This subsystem includes the oxygen sensor threads. Proper torque ensures a tight seal and accurate readings without damaging the sensor.
1 Oxygen Sensor Threads
M18 x 1.5
Oxygen Sensor Threads
M18 x 1.5Torque Value
Important Notes
Exhaust Flanges
This subsystem includes nuts that secure exhaust flanges, connecting various sections of the exhaust system. Proper torque ensures a leak-free connection.
1 Exhaust Flange Nuts
M8 x 1.25
Exhaust Flange Nuts
M8 x 1.25Torque Value
Important Notes
Heat Shields
This subsystem includes bolts that secure heat shields, protecting surrounding components from excessive heat. Proper torque ensures secure attachment without damaging the shield.
1 Exhaust Heat Shield Bolts
M6 x 1.0
Exhaust Heat Shield Bolts
M6 x 1.0Torque 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 important for exhaust bolts?
Why is using the correct torque specification important for exhaust bolts?
Using the correct torque specification is crucial to prevent exhaust leaks, damage to the exhaust components (like warping or cracking), and potential loosening of bolts due to vibration. Over-tightening can stretch or break bolts and gaskets, while under-tightening can cause leaks and potentially allow bolts to fall out.
Q2 What happens if I overtighten the exhaust bolts?
What happens if I overtighten the exhaust bolts?
Overtightening can cause bolts to stretch beyond their elastic limit, leading to thread damage, bolt failure, and potential stripping of the threads in the exhaust manifold or other components. This can require costly repairs and create exhaust leaks. For example, an over-tightened manifold bolt could crack the manifold itself.
Q3 Can I reuse exhaust gaskets?
Can I reuse exhaust gaskets?
Generally, it is NOT recommended to reuse exhaust gaskets. They are designed to crush and conform to the mating surfaces to create a seal. Once they've been compressed, they lose their ability to seal effectively and are prone to leaking. Always replace them with new gaskets when reassembling the exhaust system. For instance, a reused donut gasket at the connection between the exhaust manifold and the downpipe is very likely to leak.
Q4 Do I need to use anti-seize on exhaust bolts?
Do I need to use anti-seize on exhaust bolts?
Yes, applying a high-temperature anti-seize compound to exhaust bolts is highly recommended. The heat and exposure to the elements can cause the bolts to seize and become very difficult to remove in the future. This is especially true for the catalytic converter bolts, which often experience intense heat. A small dab of anti-seize will make future maintenance easier.
Q5 What type of bolts are typically used in the exhaust system of a 1985-1989 Acura Integra?
What type of bolts are typically used in the exhaust system of a 1985-1989 Acura Integra?
The bolts are typically high-strength steel, often with a zinc or other corrosion-resistant coating. The head style is commonly a standard hex head. Bolt sizes vary depending on the location, but common sizes include M8 and M10, so ensure you have an accurate fitment before attempting to tighten.
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 wrench used to apply specific torque to fasteners.
- 1/2-inch or 3/8-inch drive
- Foot-pound (ft-lb) or Newton-meter (Nm) scale
- Click-type or beam-type
Socket Set
A collection of sockets in various sizes to fit different exhaust fasteners.
- Metric sizes
- 6-point or 12-point design
- Deep and standard sockets
Extension Bars
Used to reach fasteners in hard-to-access areas.
- Various lengths
- Different drive sizes
- Flexible extensions
Penetrating Oil
A lubricant used to loosen rusted or seized fasteners.
- High penetration formula
- Fast acting
- Corrosion inhibitors
Service Procedures
Exhaust Manifold to Cylinder Head Torque Procedure
Procedure for torquing the exhaust manifold bolts to the cylinder head.
- Locate the exhaust manifold bolts.
- Clean the bolt threads and mating surfaces.
- Apply anti-seize compound to the bolt threads (optional).
- Tighten bolts in a criss-cross pattern in multiple stages. Initial torque to 15 ft-lb, then final torque to 23 ft-lb.
- Double-check the final torque using a torque wrench.
Exhaust Downpipe to Manifold Torque Procedure
Procedure for torquing the exhaust downpipe to the exhaust manifold.
- Locate the downpipe flange bolts.
- Clean the bolt threads and mating surfaces.
- Apply anti-seize compound to the bolt threads (optional).
- Tighten bolts in a criss-cross pattern. Initial torque to 12 ft-lb, then final torque to 16 ft-lb.
- Double-check the final torque using a torque wrench.
Exhaust Midpipe and Cat-back Torque Procedure
Procedure for torquing the bolts connecting the midpipe to the catalytic converter and cat-back exhaust.
- Locate the flange bolts connecting exhaust sections.
- Clean the bolt threads and mating surfaces.
- Apply anti-seize compound to the bolt threads (optional).
- Tighten bolts in a criss-cross pattern to 12 ft-lb.
- Double-check the final torque using a torque wrench.
Technical Service Bulletins
Exhaust Manifold Bolt Breakage Due to Overtightening
1988-06-15Reported cases of exhaust manifold bolts breaking due to excessive torque during installation. This can lead to exhaust leaks and reduced engine performance.
Resolution: Always use a calibrated torque wrench and follow the specified torque values. Use a criss-cross pattern when tightening and tighten in multiple stages to avoid warping.
Exhaust Flange Gasket Leaks
1987-03-20Some owners are experiencing exhaust leaks at flange connections despite proper torque application. This is often due to reuse of old gaskets or warped flanges.
Resolution: Always use new gaskets when reinstalling any part of the exhaust system. Inspect flanges for warpage and replace if necessary. Confirm proper bolt torque after installation
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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.