Acura MDX 2007-2013 Exhaust System Bolt Torque Specifications
This page provides detailed torque specifications for all exhaust bolts on the 2007-2013 Acura MDX, ensuring proper installation and preventing leaks.
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
Components related to the exhaust manifold, including bolts that secure the manifold to the cylinder head and heat shield.
1 Exhaust Manifold-to-Cylinder Head Bolts
M10 x 1.25
Exhaust Manifold-to-Cylinder Head Bolts
M10 x 1.25Torque Value
Important Notes
2 Exhaust Manifold Heat Shield Bolts
M8 x 1.25
Exhaust Manifold Heat Shield Bolts
M8 x 1.25Torque Value
Important Notes
Catalytic Converter
Bolts that secure the catalytic converter to the exhaust manifold and downstream exhaust pipe.
1 Catalytic Converter-to-Exhaust Manifold Flange Bolts
M12 x 1.5
Catalytic Converter-to-Exhaust Manifold Flange Bolts
M12 x 1.5Torque Value
Important Notes
2 Exhaust Pipe-to-Catalytic Converter Flange Bolts
M12 x 1.5
Exhaust Pipe-to-Catalytic Converter Flange Bolts
M12 x 1.5Torque Value
Important Notes
Exhaust Pipe And Muffler
Bolts that secure the exhaust pipe to the muffler and other intermediate sections.
1 Exhaust Pipe-to-Muffler Flange Bolts
M10 x 1.25
Exhaust Pipe-to-Muffler Flange Bolts
M10 x 1.25Torque Value
Important Notes
2 Exhaust Flange Gasket Bolts (Intermediate Pipe)
M10 x 1.25
Exhaust Flange Gasket Bolts (Intermediate Pipe)
M10 x 1.25Torque Value
Important Notes
Support And Mounting
Bolts that secure the exhaust system to the vehicle chassis and support brackets.
1 Exhaust Hanger Bolts
M8 x 1.25
Exhaust Hanger Bolts
M8 x 1.25Torque Value
Important Notes
2 Exhaust Support Bracket Bolts
M10 x 1.25
Exhaust Support Bracket Bolts
M10 x 1.25Torque Value
Important Notes
Oxygen Sensor
Bolts that secure the oxygen sensor to the exhaust system.
1 Oxygen Sensor Mounting Bolt
M10 x 1.25
Oxygen Sensor Mounting Bolt
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 Why is using the correct torque specification for exhaust bolts important?
Why is using the correct torque specification for exhaust bolts important?
Using the correct torque specification is crucial to ensure a proper seal and prevent exhaust leaks. Over-tightening can damage the bolts, crush gaskets, or even crack exhaust components. Under-tightening can lead to leaks, which can cause reduced performance, poor fuel economy, and potential safety hazards from carbon monoxide poisoning. For instance, if the flange bolts connecting the catalytic converter to the exhaust pipe are under-torqued, hot exhaust gases can escape, creating a loud hissing sound and potentially melting surrounding components.
Q2 What happens if I overtighten the exhaust bolts?
What happens if I overtighten the exhaust bolts?
Overtightening exhaust bolts can lead to several problems. You risk stretching or even breaking the bolts themselves, making them unusable. It can also crush the exhaust gaskets, leading to leaks. In more severe cases, it can damage the threaded holes in the exhaust components, requiring costly repairs or replacement. For example, an over-torqued exhaust manifold bolt can lead to a warped manifold, requiring a complete replacement of the part, rather than a simple bolt change.
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, especially those exposed to heat and the elements. This compound helps prevent the bolts from seizing or corroding, making future removal much easier. Without it, bolts can become extremely difficult to remove and may even snap, creating a frustrating and potentially expensive repair scenario. Anti-seize also helps ensure proper torque readings since it reduces friction between the bolt and the threads.
Q4 Do I need to replace exhaust gaskets when working on the exhaust system?
Do I need to replace exhaust gaskets when working on the exhaust system?
Yes, it's almost always recommended to replace exhaust gaskets any time you disassemble the exhaust system. Gaskets are designed to crush and seal properly once tightened. Reusing old gaskets often leads to leaks because they've already been compressed. Think of it like a used seal in a container; it won't seal as well the second time around. Using new gaskets guarantees a proper seal and prevents leaks.
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 torque wrench is essential for accurately tightening exhaust bolts to the manufacturer's specifications.
- Adjustable torque settings
- Click-type mechanism for accurate torque application
Socket Set (Metric)
A set of metric sockets that will fit the different sized nuts and bolts in the exhaust system.
- Various sizes to accommodate different exhaust bolts and nuts
- 6-point sockets recommended for secure grip
Extension Bars
Extension bars can provide better access to recessed or hard to reach bolts.
- Various lengths to extend reach
- Allows clearance for other components
Universal Joint
A universal joint allows sockets to reach bolts at an angle.
- Allows sockets to rotate on multiple axes
- Helpful when bolts are not perfectly straight
Penetrating Oil
Penetrating oil is helpful for loosening rusted or seized bolts.
- Loosens rusted bolts
- Reduces risk of bolt breakage
Service Procedures
Exhaust Manifold Bolt Torque Procedure
This procedure outlines how to properly torque the exhaust manifold bolts on a 2007-2013 Acura MDX.
- Locate the exhaust manifold bolts connecting the manifold to the engine head.
- Clean any dirt, rust or debris from the threads of the bolts.
- Apply a small amount of anti-seize to the threads of the bolts to prevent future corrosion and aid in future removal.
- Using the torque wrench, tighten the bolts to 23 ft-lbs in a criss-cross pattern, as this provides even distribution of force.
- Recheck each bolt, once all bolts have reached their correct torque.
- Verify that all gaskets are seated properly and there is a proper seal.
Exhaust Pipe Flange Bolt Torque Procedure
This procedure outlines how to properly torque the exhaust pipe flange bolts on a 2007-2013 Acura MDX.
- Locate the exhaust pipe flange bolts connecting the exhaust pipes to each other and the catalytic converter.
- Clean any dirt, rust, or debris from the threads of the bolts.
- Apply a small amount of anti-seize to the threads of the bolts to prevent future corrosion and aid in future removal.
- Using the torque wrench, tighten the flange bolts to 16 ft-lbs in a criss-cross pattern, as this provides even distribution of force.
- Recheck each bolt, once all bolts have reached their correct torque.
- Verify that all gaskets are seated properly and there is a proper seal.
Technical Service Bulletins
Exhaust Manifold Gasket Leakage
2010-05-15Some 2007-2009 Acura MDX vehicles may experience exhaust leaks at the manifold gasket due to bolt loosening.
Resolution: Replace the exhaust manifold gasket and ensure bolts are torqued to 23 ft-lbs, with a re-torque after a heat cycle.
Catalytic Converter Bolt Corrosion
2012-11-202007-2013 Acura MDX vehicles operated in areas with heavy road salt use may experience severe corrosion on catalytic converter bolts.
Resolution: Replace corroded bolts and apply anti-seize to all threads during reassembly. Torque 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.