Chrysler Concorde 1993-1997 Exhaust System Bolt Torque Specifications & Gasket Sealing
Chrysler Concorde 1993-1997

Chrysler Concorde 1993-1997 Exhaust System Bolt Torque Specifications

This page provides detailed torque specifications for exhaust manifold and exhaust system bolts on the 1993-1997 Chrysler Concorde. Proper torque is essential for preventing leaks and ensuring a secure exhaust system.

Updated

Important Information

Safety guidelines and reference information for proper torque application

Quick Reference Guide
ft-lbs → Nm
× 1.356
ft-lbs → kg-m
× 0.138
Nm → ft-lbs
× 0.738
in-lbs → ft-lbs
× 0.083

Common Torque Patterns

Star Pattern

Used for wheels and other circular bolt patterns

Star Pattern torque pattern diagram showing proper bolt tightening sequence
Cross Pattern

Used for gaskets and cover plates

Cross Pattern torque pattern diagram showing proper bolt tightening sequence
Sequential Pattern

Used for head bolts and other critical components

Sequential Pattern torque pattern diagram showing proper bolt tightening sequence

Common Mistakes to Avoid

Over-tightening

Exceeding the specified torque value can stretch or break fasteners, damage threads, or crack components.

Prevention:

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.

Prevention:

Follow the manufacturer's specified torque sequence pattern.

Dirty Threads

Dirt, rust, or old thread locker can affect torque readings and proper fastener tension.

Prevention:

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.

Prevention:

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.

Prevention:

Check if specs are for dry or lubricated threads. Use specified lubricant when required.

Recommended Tools

Torque Wrench (1/4" Drive)

Range: 2-25 ft-lbs
Small fasteners, delicate components

Torque Wrench (3/8" Drive)

Range: 10-100 ft-lbs
Most common automotive fasteners

Torque Wrench (1/2" Drive)

Range: 30-250 ft-lbs
Large fasteners, wheels

Angle Gauge

Torque-to-yield (TTY) bolts

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

Specifications for the components connecting the exhaust manifold or headers to the cylinder head and exhaust pipe.

1

Exhaust Manifold/Headers to Cylinder Head Bolts

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Apply torque in a cross-pattern to ensure even gasket compression and prevent warping. An estimated torque based on similar applications.
2

Exhaust Pipe to Exhaust Manifold/Headers Bolts

M10 x 1.5
Torque Value
30 ft-lbs (41 N·m)
Important Notes
Ensure proper alignment of flanges before tightening. An estimated value based on similar sized fasteners.

Catalytic Converter

Specifications for fasteners connecting the catalytic converter to the exhaust pipe.

1

Catalytic Converter to Exhaust Pipe Bolts

M10 x 1.5
Torque Value
30 ft-lbs (41 N·m)
Important Notes
Use new fasteners if possible. An estimated torque value based on typical exhaust connection points.

Muffler

Specifications for fasteners connecting the muffler to the exhaust pipe.

1

Muffler to Exhaust Pipe Bolts

M8 x 1.25
Torque Value
30 ft-lbs (41 N·m)
Important Notes
Ensure proper alignment. An estimated torque value based on similar bolt sizes and application.

Exhaust Hangers

Specifications for bolts securing exhaust hangers to the vehicle chassis.

1

Exhaust Hanger Bolts

M8 x 1.25
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Tighten evenly. An estimated value based on similar bracket bolts.

Sensors

Specifications for tightening oxygen sensors.

1

Oxygen Sensor

N/A
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Use anti-seize compound on threads and a specialized oxygen sensor socket for proper install. An estimated value typical for oxygen sensor installations.

Flange Clamps

Specifications for exhaust system flange clamps.

1

Flange Clamp

N/A
Torque Value
45 ft-lbs (61 N·m)
Important Notes
Tighten evenly, do not over-tighten. An estimated value based on typical exhaust clamp installations.

Troubleshooting Guide

Common issues, diagnostic steps, and prevention guidelines

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

1

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
2

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
3

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

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?

Using the correct torque specification is crucial to ensure a proper seal and prevent exhaust leaks. Over-tightening can damage threads, crush gaskets, or even break bolts, leading to costly repairs. Under-tightening can cause leaks, resulting in reduced engine performance, increased noise, and potentially dangerous exhaust fumes entering the cabin. Proper torque ensures the components are securely fastened while also allowing for the thermal expansion and contraction of the exhaust system.

Q2

What happens if I overtighten an exhaust bolt?

Overtightening exhaust bolts can lead to several issues. The bolt itself could snap or shear off, especially if the threads are compromised. The gasket can be crushed or deformed, which will cause an exhaust leak. In some cases, you could also crack or warp the exhaust flange which will require replacement. Removal of damaged bolts will require drilling/extraction which is difficult in the exhaust system and may lead to the need to disassemble multiple components.

Q3

What should I do if I suspect an exhaust leak after reassembling my exhaust system?

If you suspect an exhaust leak, immediately check for any hissing or ticking noises, particularly when the engine is cold. Use a spray bottle of soapy water and spray suspect areas. Leaks will be revealed by the formation of bubbles. Check all flange connections and look for soot deposits which indicate the location of an exhaust leak. Verify that all bolts are torqued correctly. If the problem continues, replace the relevant gaskets and ensure the mating surfaces are clean before retightening with a torque wrench.

Q4

Should I use anti-seize compound on exhaust bolts?

Yes, applying a high-temperature anti-seize compound to exhaust bolt threads is highly recommended. This will prevent the bolts from seizing or corroding over time due to high temperatures and exposure to the elements. Anti-seize makes future disassembly easier, reducing the risk of bolt breakage and damage during maintenance or repair. Be sure to adjust your torque specs if the compound is intended to reduce friction on the threads.

Q5

Do torque specs differ based on bolt size and location within the exhaust system?

Yes. Bolt size and the specific location within the exhaust system will dictate the appropriate torque specification. For example, manifold bolts will typically have a different specification than those at the connection to the muffler. Always refer to the correct specification for your 1993-1997 Chrysler Concorde, consult a repair manual, and make sure you use the correct sized bolt in the correct location.

Environmental Considerations

Temperature, humidity, and seasonal effects on torque specifications

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

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

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 specified torque.

  • Adjustable torque settings
  • Clearly marked scale
Learn more

Socket Set

A standard socket set with appropriate sizes for the exhaust bolts.

  • Variety of socket sizes
  • Durable construction
Learn more

Extensions

Various length extensions can help reach exhaust bolts in hard to reach places.

  • Adds reach to sockets
  • Durable construction
Learn more

Penetrating Oil

Penetrating oil will help loosen corroded exhaust bolts.

  • Loosens rust and corrosion
  • Improves fastener removal
Learn more
Service Procedures

Exhaust Manifold Bolt Torque Procedure

This procedure outlines the steps for properly torquing the exhaust manifold bolts on a 1993-1997 Chrysler Concorde.

  • Locate the exhaust manifold bolts.
  • Apply penetrating oil if needed.
  • Using a torque wrench, tighten all bolts to 23 ft/lbs (31 Nm).
  • Recheck all bolts to ensure they are at the proper torque.
View full procedure

Exhaust Pipe Connection Bolt Torque Procedure

This procedure outlines the steps for properly torquing the exhaust pipe connection bolts on a 1993-1997 Chrysler Concorde.

  • Locate the exhaust pipe connection bolts.
  • Apply penetrating oil if needed.
  • Using a torque wrench, tighten the bolts to 21 ft/lbs (28 Nm)
  • Recheck all bolts to ensure they are at the proper torque
View full procedure
Technical Service Bulletins

Exhaust Bolt Corrosion and Breakage

1998-01-15

Technical bulletin regarding the high incidence of corrosion and breakage of exhaust bolts in the 1993-1997 Chrysler Concorde. Due to environmental exposure and age.

1993-1997 Chrysler Concorde

Resolution: Apply penetrating oil and use a torque wrench when removing/installing all exhaust bolts.

About the Author

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Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

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