Acura CL 1997-1999 Exhaust System Bolt Torque Specifications
Detailed torque specifications for exhaust bolts on the 1997-1999 Acura CL, including manifold, downpipe, and other exhaust component fasteners.
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
Torque specifications for exhaust manifold and header components.
1 Exhaust Manifold/Headers to Cylinder Head Bolts
M10 x 1.5
Exhaust Manifold/Headers to Cylinder Head Bolts
M10 x 1.5Torque Value
Important Notes
2 Exhaust Pipe to Exhaust Manifold/Headers Bolts
M10 x 1.5
Exhaust Pipe to Exhaust Manifold/Headers Bolts
M10 x 1.5Torque Value
Important Notes
Exhaust System
Torque specifications for exhaust piping, catalytic converter, and muffler.
1 Catalytic Converter to Exhaust Pipe Bolts
M10 x 1.5
Catalytic Converter to Exhaust Pipe Bolts
M10 x 1.5Torque Value
Important Notes
2 Muffler to Exhaust Pipe Bolts
M8 x 1.25
Muffler to Exhaust Pipe Bolts
M8 x 1.25Torque Value
Important Notes
3 Exhaust Flange Spring Bolts/Nuts
M8 x 1.25
Exhaust Flange Spring Bolts/Nuts
M8 x 1.25Torque Value
Important Notes
4 Exhaust Band Clamps
varies per clamp
Exhaust Band Clamps
varies per clampTorque Value
Important Notes
5 Exhaust Hanger Bolts/Nuts
M8 x 1.25
Exhaust Hanger Bolts/Nuts
M8 x 1.25Torque Value
Important Notes
Exhaust Sensors
Torque specifications for exhaust sensors.
1 Oxygen Sensor
M18 x 1.5
Oxygen Sensor
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 specification important for exhaust bolts?
Why is using the correct torque specification important for exhaust bolts?
Using the correct torque specification is crucial for preventing exhaust leaks and damage. Under-tightening can lead to leaks, which reduce engine performance and may introduce dangerous exhaust fumes into the cabin. Over-tightening can stretch or break bolts, damage gaskets, or even crack exhaust components like manifolds or flanges, leading to costly repairs. Correct torque ensures even clamping force for a proper seal.
Q2 What happens if I overtighten an exhaust bolt?
What happens if I overtighten an exhaust bolt?
Overtightening exhaust bolts can cause several issues. You might strip the threads on the bolt or the receiving hole in the manifold, rendering them unusable. You could also crush the gasket, preventing it from sealing correctly and causing an exhaust leak. In severe cases, you could crack the exhaust manifold or flange, requiring replacement of expensive components. It's always better to tighten to the recommended torque and double-check.
Q3 Should I use anti-seize compound on exhaust bolts?
Should I use anti-seize compound on exhaust bolts?
Yes, it's highly recommended to use anti-seize compound on exhaust bolts. Exhaust systems experience extreme temperature fluctuations, which can lead to corrosion and seized bolts. Applying anti-seize will make future removal much easier and help prevent damage or breakage during future maintenance. Apply a small amount to the bolt threads, avoiding the bolt head or clamping surfaces. Remember that the torque value is specified for dry threads, reduce the torque value slightly if using anti-seize to avoid over tightening.
Q4 How often should I inspect my exhaust system?
How often should I inspect my exhaust system?
Regular inspection of your exhaust system is a good idea, especially around the bolted connections. Aim to inspect your exhaust system, including the bolts, every 6 months or every time you change your oil. Listen for any unusual hissing or ticking sounds that may indicate an exhaust leak. Check for rust, corrosion, or loose bolts. Timely inspection can prevent major problems and costly repairs down the line.
Q5 What type of gasket should I use when reassembling the exhaust?
What type of gasket should I use when reassembling the exhaust?
Always use the correct type of gasket specified for your 1997-1999 Acura CL. Typically, this will be a multi-layered metal gasket or a graphite gasket. Using an incorrect gasket can lead to improper sealing and leaks. When replacing a gasket, always clean the sealing surfaces of the flange to ensure a good, flat contact surface. Never reuse an old gasket, as they lose their ability to seal properly after being compressed.
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 (3/8" Drive)
A calibrated torque wrench is essential for accurately tightening exhaust bolts to the manufacturer's specifications.
- Measures torque in ft-lbs or Nm
- Click-type or digital readout
- Range covering the required torque values
Socket Set (3/8" Drive)
A set of sockets that includes sizes appropriate for the exhaust flange bolts, nuts, and studs. Typically 10mm, 12mm and 14mm.
- Various metric socket sizes
- 6-point sockets are recommended
- Shallow and Deep sockets
Ratchet (3/8" Drive)
A ratchet wrench is used to quickly tighten or loosen bolts and nuts.
- Durable construction
- Fine-tooth mechanism
- Comfortable grip
Wrench Set
A set of open-end or combination wrenches may be needed in combination with sockets.
- Various metric wrench sizes
- Commonly used sizes like 10mm, 12mm and 14mm
- Durable construction
Penetrating Oil
Used to loosen corroded or seized exhaust bolts and nuts.
- Reduces rust and corrosion
- Loosens stuck fasteners
- Helps prevent breaking bolts
Service Procedures
Exhaust Manifold to Cylinder Head Bolt Torque
Procedure for tightening the exhaust manifold to cylinder head bolts.
- Apply penetrating oil to the exhaust manifold bolts and allow it to soak.
- Hand-tighten all exhaust manifold bolts.
- Using a torque wrench, tighten the bolts to 23 ft-lbs (31 Nm) in a criss-cross pattern.
- Verify the torque setting and confirm that all bolts are tightened to the proper specification.
Exhaust Flange Bolt Torque (Front Pipe to Manifold)
Procedure for tightening the exhaust flange bolts connecting the front pipe to the exhaust manifold.
- Apply penetrating oil to the flange bolts and allow it to soak.
- Hand-tighten all flange bolts.
- Using a torque wrench, tighten the bolts to 33 ft-lbs (45 Nm).
- Verify the torque setting and confirm that all bolts are tightened to the proper specification.
Exhaust Flange Bolt Torque (Front Pipe to Catalytic Converter)
Procedure for tightening the exhaust flange bolts connecting the front pipe to the catalytic converter.
- Apply penetrating oil to the flange bolts and allow it to soak.
- Hand-tighten all flange bolts.
- Using a torque wrench, tighten the bolts to 33 ft-lbs (45 Nm).
- Verify the torque setting and confirm that all bolts are tightened to the proper specification.
Exhaust Flange Bolt Torque (Catalytic Converter to Intermediate Pipe)
Procedure for tightening the exhaust flange bolts connecting the catalytic converter to the intermediate pipe.
- Apply penetrating oil to the flange bolts and allow it to soak.
- Hand-tighten all flange bolts.
- Using a torque wrench, tighten the bolts to 33 ft-lbs (45 Nm).
- Verify the torque setting and confirm that all bolts are tightened to the proper specification.
Exhaust Flange Bolt Torque (Intermediate Pipe to Muffler)
Procedure for tightening the exhaust flange bolts connecting the intermediate pipe to the muffler.
- Apply penetrating oil to the flange bolts and allow it to soak.
- Hand-tighten all flange bolts.
- Using a torque wrench, tighten the bolts to 33 ft-lbs (45 Nm).
- Verify the torque setting and confirm that all bolts are tightened to the proper specification.
Oxygen Sensor Torque
Procedure for tightening the Oxygen Sensors to the exhaust system.
- Apply anti-seize compound to the oxygen sensor threads
- Hand-tighten the oxygen sensor.
- Using a wrench, tighten the sensor to 29 ft-lbs (39 Nm).
- Verify the torque setting and confirm the sensor is properly tightened.
Technical Service Bulletins
Exhaust Bolt Corrosion Issues
2001-05-15Some 1997-1999 Acura CL models have been observed to have premature corrosion on exhaust bolts, leading to difficulty in removal and proper torque application.
Resolution: Use penetrating oil liberally when removing exhaust bolts. Replace any severely corroded bolts. Ensure proper torque is applied upon reinstallation. Consider using anti-seize compound on bolt threads during reassembly.
Recommended Torque Values for Exhaust System
1999-01-20Clarification on proper torque values for various bolts in the exhaust system to ensure optimal sealing and prevent future exhaust leaks.
Resolution: Refer to specified torque values when reinstalling any exhaust bolts. Improperly torqued bolts can cause leaks, or damage the exhaust system.
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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.