Acura ILX 2013-2021 Exhaust System Bolt Torque Specifications
Detailed torque specifications for all exhaust bolts on the 2013-2021 Acura ILX, including manifold, downpipe, and cat-back system 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 bolts that secure the exhaust manifold or headers to the cylinder head, ensuring a tight seal to prevent exhaust leaks.
1 Exhaust Manifold/Headers Bolts
M10 x 1.25
Exhaust Manifold/Headers Bolts
M10 x 1.25Torque Value
Important Notes
2 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
Exhaust Pipe Connections
This subsystem includes bolts that connect various components of the exhaust system, such as the exhaust pipe to the manifold/headers, catalytic converter, and muffler.
1 Exhaust Pipe to Exhaust Manifold/Headers Bolts
M10 x 1.25
Exhaust Pipe to Exhaust Manifold/Headers Bolts
M10 x 1.25Torque Value
Important Notes
2 Catalytic Converter to Exhaust Pipe Bolts
M10 x 1.25
Catalytic Converter to Exhaust Pipe Bolts
M10 x 1.25Torque Value
Important Notes
3 Muffler to Exhaust Pipe Bolts
M10 x 1.25
Muffler to Exhaust Pipe Bolts
M10 x 1.25Torque Value
Important Notes
Exhaust Support Accessories
This subsystem includes bolts and nuts that secure heat shields, hangers, and sensors, ensuring the stability and functionality of the exhaust system.
1 Exhaust Heat Shield Bolts
M6 x 1.0
Exhaust Heat Shield Bolts
M6 x 1.0Torque Value
Important Notes
2 Exhaust Hanger Bolts/Nuts
M8 x 1.25
Exhaust Hanger Bolts/Nuts
M8 x 1.25Torque Value
Important Notes
3 O2 Sensor Mounting Bolts
M8 x 1.25
O2 Sensor Mounting Bolts
M8 x 1.25Torque Value
Important Notes
Exhaust Flange Connections
This subsystem includes bolts that connect different sections of the exhaust system using flanges, ensuring a tight seal to prevent leaks.
1 Exhaust Flange Bolts (Downpipe to Midpipe)
M10 x 1.25
Exhaust Flange Bolts (Downpipe to Midpipe)
M10 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 exhaust flange, or crush the gasket. This can lead to exhaust leaks, rattling noises, and potential exhaust system failure. Always use a torque wrench and tighten to the manufacturer's specifications.
Q2 What happens if I undertighten exhaust bolts?
What happens if I undertighten exhaust bolts?
Undertightening exhaust bolts can cause exhaust leaks, resulting in a loss of engine power, poor fuel economy, and a loud or raspy exhaust noise. Loose bolts can also allow the exhaust system to shift, potentially causing further damage. In some scenarios, the loose bolt can completely separate from the system, presenting a dangerous road hazard for the vehicle and other drivers. Ensure that bolts are tightened to the specified torque.
Q3 Do I need to use new exhaust gaskets every time I remove the exhaust?
Do I need to use new exhaust gaskets every time I remove the exhaust?
Yes, it is strongly recommended to replace exhaust gaskets whenever you remove or loosen the exhaust system. Exhaust gaskets are designed to crush and conform to the mating surfaces, providing a seal. Once they've been compressed, they are less likely to seal properly, leading to leaks even if retightened. Using new gaskets is critical to ensure a proper exhaust seal and avoid exhaust leaks. For example, if you're replacing the cat-back exhaust, buy new gaskets for the flange connections.
Q4 Should I use anti-seize on exhaust bolts?
Should I use anti-seize on exhaust bolts?
Yes, applying a thin coat of anti-seize compound to the threads of exhaust bolts is highly recommended. This helps prevent the bolts from seizing due to heat and corrosion, making future removal easier and preventing bolt breakage. However, be careful not to get anti-seize on the flange contact surfaces or the threads of the nuts. Just apply a small amount to the bolt threads only.
Q5 What torque wrench settings should I use when tightening exhaust bolts?
What torque wrench settings should I use when tightening exhaust bolts?
Always refer to the specific torque specifications for your vehicle and the specific exhaust component. While some bolts may have similar torque requirements, the specific needs of the Acura ILX are most accurate with a repair manual. For example, the downpipe flange bolts will have different torque specifications than those at the muffler connection. Consult a service manual or a trusted source.
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-inch Drive)
A calibrated torque wrench is essential for accurately tightening exhaust bolts to specification, preventing leaks and damage.
- 10-150 ft-lb torque range
- Click-type mechanism for accurate torque application
Socket Set (10mm, 12mm, 14mm)
A socket set with common sizes needed for exhaust bolt removal and installation.
- 1/2-inch drive compatible
- 6-point sockets for secure grip
Extension Bar (Various Lengths)
Extension bars are helpful for reaching bolts that are located in recessed or hard-to-reach areas.
- 1/2-inch drive compatible
- Various length options for versatility
Penetrating Oil
Penetrating oil can help to loosen corroded or stuck exhaust bolts.
- Fast-acting formula
- Spray nozzle for easy application
Service Procedures
Exhaust Manifold to Cylinder Head Bolt Torque
Procedure for tightening the exhaust manifold to cylinder head bolts.
- Locate the exhaust manifold bolts.
- Apply penetrating oil if bolts appear corroded or difficult to remove.
- Using the appropriate socket and torque wrench, tighten the exhaust manifold bolts to 23 ft-lbs. This should be completed in a star pattern.
- Re-check torque after a test drive.
Exhaust Pipe to Manifold Bolt Torque
Procedure for tightening the exhaust pipe to manifold bolts.
- Locate the exhaust pipe to manifold flange bolts.
- Apply penetrating oil if bolts appear corroded or difficult to remove.
- Using the appropriate socket and torque wrench, tighten the exhaust pipe to manifold bolts to 23 ft-lbs.
- Re-check torque after a test drive.
Exhaust Pipe Flange Bolt Torque (Mid-Pipe)
Procedure for tightening the bolts at the mid-pipe flange.
- Locate the flange bolts connecting the mid-pipe sections.
- Apply penetrating oil if bolts appear corroded or difficult to remove.
- Using the appropriate socket and torque wrench, tighten the flange bolts to 16 ft-lbs.
- Re-check torque after a test drive.
Exhaust Pipe Flange Bolt Torque (Muffler)
Procedure for tightening the bolts at the muffler flange.
- Locate the flange bolts connecting the exhaust pipe to the muffler.
- Apply penetrating oil if bolts appear corroded or difficult to remove.
- Using the appropriate socket and torque wrench, tighten the flange bolts to 16 ft-lbs.
- Re-check torque after a test drive.
Technical Service Bulletins
Exhaust Leakage at Manifold Flange
2015-06-15Some vehicles may exhibit exhaust leaks due to improper torque of the exhaust manifold flange bolts.
Resolution: Inspect exhaust manifold bolts. Verify torque to 23 ft-lbs. Replace gasket if necessary.
Premature Exhaust Bolt Corrosion
2017-09-22Vehicles operating in harsh environments may experience premature corrosion of exhaust bolts, leading to difficulty in removal and potential leaks.
Resolution: Apply anti-seize compound to all exhaust bolts upon reassembly. Inspect and replace bolts as needed when servicing the system.
Exhaust System Rattling Noise
2020-02-29Some vehicles may develop a rattling noise from the exhaust system due to loose flange bolts.
Resolution: Inspect all exhaust flange bolts and verify torque. Tighten flange bolts to 16 ft-lbs.
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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.