Chrysler Concorde 1993-1997 Emissions & Sensor Bolt Torque Specifications
Chrysler Concorde 1993-1997

Chrysler Concorde 1993-1997 Emissions & Sensor Bolt Torque Specifications

This page provides detailed torque specifications for bolts on various emissions sensors in the 1993-1997 Chrysler Concorde. Includes oxygen sensors, EGR valve, and other related sensor mountings.

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 System

Torque specifications for various components within the exhaust system, including the manifold, pipes, and catalytic converter. Proper torque is critical to prevent leaks and ensure accurate sensor readings.

1

Exhaust Manifold to Cylinder Head Bolts

M10 x 1.5
Torque Value
22.5 ft-lbs (30.5 N·m)
Important Notes
Torque in a cross pattern. These bolts secure the exhaust manifold directly to the cylinder head. Proper torque is essential for preventing exhaust leaks.
2

Exhaust Pipe to Exhaust Manifold/Headers Bolts

M10 x 1.5
Torque Value
30 ft-lbs (40.7 N·m)
Important Notes
Secures the exhaust pipe to the manifold. Proper torque prevents leaks. If equipped, use new gaskets and be careful not to damage the flange.
3

Catalytic Converter to Exhaust Pipe Bolts

M10 x 1.5
Torque Value
30 ft-lbs (40.7 N·m)
Important Notes
Proper torque ensures a leak-free connection between the catalytic converter and the exhaust pipe. Use new gasket if equipped.
4

Oxygen (O2) Sensor

M18 x 1.5
Torque Value
32 ft-lbs (43.4 N·m)
Important Notes
O2 sensor should be torqued properly using a crow's foot wrench to prevent damaging the sensor and its threads. The crush washer on the sensor should be inspected or replaced if damaged.

Intake System

Torque specifications for sensors and components related to the intake system, critical for accurate air measurement and proper fuel delivery.

1

Mass Airflow Sensor (MAF) Mounting Bolts

M5 x 0.8
Torque Value
6.5 ft-lbs (8.8 N·m)
Important Notes
Plastic housing, do not over-tighten. Estimated value.
2

Intake Air Temperature (IAT) Sensor Mounting Bolt

M5 x 0.8
Torque Value
6.5 ft-lbs (8.8 N·m)
Important Notes
Usually a plastic housing, do not over-tighten. Estimated value.
3

Manifold Absolute Pressure (MAP) Sensor Mounting Bolt/Screws

M5 x 0.8
Torque Value
6.5 ft-lbs (8.8 N·m)
Important Notes
Usually a plastic housing, do not over-tighten. Estimated value.
4

Throttle Position Sensor (TPS) Mounting Bolts

M4 x 0.7
Torque Value
1 ft-lbs (1.4 N·m)
Important Notes
These are very small bolts. Do not over-tighten, they are often screws in a plastic housing. Estimated value.

Fuel System

Torque specifications for components related to the fuel system, ensuring proper fuel delivery and preventing leaks.

1

Fuel Injector Bolts

M6 x 1.0
Torque Value
9.6 ft-lbs (13 N·m)
Important Notes
Proper torque prevents leaks. 105-125 inch-lbs converted to ft-lbs. Use new O-rings.
2

Fuel Injector Rail Bolts

M6 x 1.0
Torque Value
9.6 ft-lbs (13 N·m)
Important Notes
105-125 inch-lbs converted to ft-lbs. Proper torque ensures correct pressure and prevents fuel leaks.

Engine Sensors

Torque specifications for various sensors mounted on the engine block and components, ensuring proper sensor function and signal accuracy.

1

Crankshaft Position Sensor Mounting Bolt

M6 x 1.0
Torque Value
9 ft-lbs (12.2 N·m)
Important Notes
Proper torque is essential to secure the sensor and provide an accurate reading. Estimated value.
2

Camshaft Position Sensor Mounting Bolt

M6 x 1.0
Torque Value
9 ft-lbs (12.2 N·m)
Important Notes
Proper torque is essential for an accurate reading from this sensor. Estimated value.
3

Knock Sensor Mounting Bolts

M8 x 1.25
Torque Value
17.5 ft-lbs (23.7 N·m)
Important Notes
Directly mounted to the block, proper torque for accurate readings.

Evaporative Emissions

Torque specifications for components within the evaporative emissions (EVAP) system, ensuring proper vapor handling and system integrity.

1

Evaporative Emissions (EVAP) Purge Valve Mounting Bolts

M5 x 0.8
Torque Value
4.6 ft-lbs (6.2 N·m)
Important Notes
These bolts are usually small and mount a plastic valve, do not over-tighten. 50-60 inch-lbs converted to ft-lbs.
2

Charcoal Canister Mounting Bolts

M6 x 1.0
Torque Value
7.5 ft-lbs (10.2 N·m)
Important Notes
Secure mounting of the canister to ensure proper operation. Estimated value.

Egr System

Torque specifications for the EGR valve, ensuring a leak-free connection within the exhaust recirculation system.

1

EGR Valve Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20.3 N·m)
Important Notes
Proper torque prevents leaks in the EGR system and ensures optimal function. Average of provided range.

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 are precise torque specifications important for emissions sensor bolts?

Precise torque is crucial for proper sensor function and sealing. Over-tightening can damage the sensor housing, threads, or gasket, leading to leaks, inaccurate readings, or even sensor failure. Under-tightening can also cause leaks and allow for movement, again affecting accuracy. For example, an oxygen sensor not torqued correctly might allow exhaust gas to bypass the gasket, causing a false lean reading.

Q2

Can I reuse the gaskets or O-rings on emissions sensors?

Generally, it's not recommended. Gaskets and O-rings deform upon installation, creating a seal. Reusing them can lead to leaks and inaccurate readings. It's best practice to replace them with new ones each time you remove and reinstall a sensor. For example, reusing an old EGR valve gasket is likely to cause an exhaust leak, triggering a check engine light.

Q3

What happens if I overtighten an emissions sensor bolt?

Overtightening can damage the sensor itself, the threads in the manifold or exhaust pipe, or crush the gasket/seal. This can cause leaks, inaccurate readings, or sensor failure. In extreme cases, the bolt can shear off inside the component, requiring drilling and repair, leading to further expense. An overtightened MAP sensor, for example, might crack the sensor housing internally.

Q4

Are there different torque specifications for different emissions sensors?

Yes, different sensors often have different torque specifications. For example, the MAP sensor, EGR valve, and oxygen sensors will each have their own specific torque range due to their different materials, mounting locations, and functions. It's important to consult the specific repair manual for your 1993-1997 Chrysler Concorde to get the exact torque values for each individual sensor you are working on.

Q5

Where can I find the correct torque specifications for my specific emissions sensor on my 1993-1997 Chrysler Concorde?

The most reliable source for torque specifications is the factory service manual (FSM) for your vehicle. Aftermarket repair manuals like Haynes or Chilton may also contain this information. The specific specifications vary by year, engine type, and the exact sensor in question, so always verify the correct value. For example, a 1993 Concorde with a 3.3L V6 will have different torque specs than a 1996 with the 3.5L V6, for certain sensors.

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 achieving precise bolt tightening. Choose one with an appropriate range for the specified torque values.

  • Adjustable torque settings
  • Click-type mechanism for accurate readings
Learn more

Socket Set

A standard socket set with various sizes to match the emissions sensor bolts.

  • Metric sizes
  • 6-point sockets for better grip
Learn more

Extension Bars

Extension bars may be necessary to reach some of the emissions sensor bolts.

  • Various lengths
  • Durable construction
Learn more
Service Procedures

Emissions Sensor Bolt Torque Specification Verification

This procedure outlines how to identify and correctly torque the emissions sensor bolts on a 1993-1997 Chrysler Concorde.

  • Locate the specific emissions sensor you are working with (e.g., O2 sensor, EGR valve).
  • Identify the bolt size and type holding the sensor.
  • Refer to the proper torque specification for that specific sensor and bolt (see Technical Bulletins section if available).
  • Using a calibrated torque wrench, tighten the bolts to the specified torque value.
  • Verify the torque setting one final time after tightening.
View full procedure
Technical Service Bulletins

1993-1997 Chrysler Concorde Emissions Sensor Bolt Torque Specifications

N/A

This bulletin provides the recommended torque specifications for various emissions sensor bolts on 1993-1997 Chrysler Concorde models. Specific torque values may vary based on sensor type and location.

1993-1997 Chrysler Concorde

Resolution: Refer to the vehicle's service manual or a reputable repair guide for specific sensor bolt torque values. General values are typically between 18-22 lb-ft for M8 bolts and 7-10 lb-ft for M6 bolts. O2 sensor nuts are often hand tightened, plus a 1/8th to 1/4th turn. These are *general* guidelines; consult your specific vehicle's documentation for precise torque values. **Always double-check with the official service manual for your model year.**

About the Author

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Alan Montanye - Automotive Technical Specialist
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Alan Montanye

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