Chrysler Concorde 1998-2004 3.5L Engine Bolt Torque Specifications & Fastener Values
Chrysler Concorde 1998-2004

Chrysler Concorde 1998-2004 3.5L Engine Bolt Torque Specifications

Comprehensive guide to bolt torque specifications for the 3.5L engine used in the 1998-2004 Chrysler Concorde. Includes torque values for various engine components.

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

Cylinder Head

Components related to the cylinder head, including bolts, spark plugs, and rocker arms. Critical for combustion sealing and valve operation.

1

Cylinder Head Bolts

M12 x 1.75
Important Notes
Tighten in sequence as specified in the service manual. Angle torque values are approximate; refer to the service manual for precise specifications.
2

Camshaft Bearing Cap Bolts

M8 x 1.25
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Tighten evenly to avoid camshaft binding. Estimated value based on similar applications.
3

Spark Plugs

M14 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Ensure spark plug threads are clean before installation.
4

Rocker Arms/Shafts Bolts

M8 x 1.25
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Tighten evenly to avoid bending or damage.

Crankshaft And Connecting Rods

Components related to the crankshaft and connecting rods, essential for converting linear motion to rotational motion.

1

Main Bearing Bolts

M12 x 1.75
Torque Value
100 ft-lbs (136 N·m)
Important Notes
Tighten evenly to ensure proper bearing alignment.
2

Connecting Rod Nuts

M10 x 1.5
Torque Value
45 ft-lbs (61 N·m)
Important Notes
Tighten evenly to ensure proper bearing alignment.
3

Crankshaft Pulley/Harmonic Balancer Bolt

M16 x 2.0
Torque Value
110 ft-lbs (149 N·m)
Important Notes
Apply threadlocker to the bolt threads
4

Flywheel Bolts

M10 x 1.5
Torque Value
75 ft-lbs (102 N·m)
Important Notes
Tighten in a star pattern.

Engine Timing

Components related to the engine timing, crucial for valve timing and proper engine operation.

1

Timing Belt/Chain Tensioner Bolt

M8 x 1.25
Torque Value
21 ft-lbs (28 N·m)
Important Notes
Ensure proper tensioner alignment before tightening. Converted from 250 inch-lbs.
2

Camshaft Sprocket Bolt

M8 x 1.25
Torque Value
21 ft-lbs (28 N·m)
Important Notes
Ensure proper sprocket alignment before tightening. Converted from 250 inch-lbs.
3

Timing Chain Guide Bolts/Tensioner Mount Bolts

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Ensure guides and mount are correctly positioned. Estimated value based on similar applications.

Intake And Exhaust

Components related to intake and exhaust, responsible for air and exhaust flow.

1

Intake Manifold Bolts

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Tighten in sequence as specified in the service manual. Converted from 105 inch-lbs.
2

Intake manifold plenum to intake manifold lower bolts

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Tighten evenly. Converted from 105 inch-lbs.
3

Throttle Body Bolts

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Tighten evenly. Converted from 105 inch-lbs.
4

Exhaust Manifold/Headers Bolts

M8 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Tighten evenly to avoid warping.
5

EGR Valve Bolts

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Tighten evenly. Converted from 105 inch-lbs.

Fuel System

Components related to the fuel delivery system, crucial for proper engine operation and preventing fuel leaks.

1

Fuel Rail Bolts

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Tighten evenly. Converted from 105 inch-lbs.
2

Fuel Injector Rail Bolts

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Tighten evenly. Converted from 105 inch-lbs.
3

Fuel Injector Bolts

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Tighten evenly. Converted from 105 inch-lbs.

Engine Lubrication

Components related to the engine lubrication system, crucial for maintaining proper oil pressure and reducing wear.

1

Oil Pan Bolts

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Tighten in sequence as specified in the service manual. Converted from 105 inch-lbs.
2

Oil Drain Plug Bolt

M14 x 1.5
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Use a new crush washer.
3

Oil Filter Housing Bolt

N/A
Torque Value
0 ft-lbs (0 N·m)
Important Notes
Hand-tighten only; no torque spec.

Engine Cooling

Components related to the engine cooling system, crucial for regulating engine temperature.

1

Water Pump Bolts

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Tighten evenly. Converted from 105 inch-lbs.
2

Water Pump Pulley Bolts

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Tighten evenly. Converted from 105 inch-lbs.
3

Thermostat Housing Bolts

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Tighten evenly. Converted from 105 inch-lbs.

Ignition System

Components related to the engine ignition system, crucial for combustion and engine operation.

1

Ignition Coil Bolt

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Tighten evenly. Converted from 105 inch-lbs.

Valve Covers

Components related to the valve cover, critical for sealing the valve train and preventing oil leaks.

1

Valve Cover Bolts

M6 x 1.0
Torque Value
5 ft-lbs (7 N·m)
Important Notes
Tighten evenly, converted from 55 inch-lbs

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 torque specifications important?

Proper torque ensures components are held together securely without over-stressing or under-tightening bolts. Over-tightening can lead to bolt failure, stripped threads, or damage to engine components like the block or cylinder head. Under-tightening can result in leaks, vibrations, and component failure. For example, if you under-torque the intake manifold bolts, you might experience vacuum leaks and engine performance issues.

Q2

What happens if I don't have a torque wrench?

While using a torque wrench is highly recommended, if you don't have one, approximating torque is possible with care. However, this is risky. For example, trying to tighten cylinder head bolts without a torque wrench could easily lead to severe engine damage. Consider borrowing or renting a torque wrench for accurate tightening. Relying on feel can easily lead to over-tightening or under-tightening.

Q3

Do I need to use new bolts when reassembling?

In some cases, yes. For critical engine components like the cylinder head bolts on the 3.5L, it is highly recommended to use new bolts, as they may stretch during tightening and become less reliable if reused. Refer to the factory service manual for your specific application to be sure and to confirm if it's a torque-to-yield bolt which requires specific procedures. Failing to use new bolts can result in sealing issues or even engine failure.

Q4

What does 'torque to yield' mean?

Torque-to-yield (TTY) bolts are designed to stretch when tightened to a specific torque value, providing a very secure connection. This type of bolt CANNOT be reused because it has already been stretched. Cylinder head bolts are a common example, often requiring a specific sequence of tightening and angle in addition to a starting torque spec.

Q5

Can I use thread locker or anti-seize?

Thread locker is used to prevent loosening of bolts due to vibration, and can be used on various components. Anti-seize compound is used to lubricate the threads and prevent corrosion, aiding accurate torque readings. Be sure to check service specifications on the bolt being worked on to confirm if these are appropriate. For example, some exhaust manifold bolts benefit from anti-seize. When used, it's crucial to adjust torque specifications as these compounds can impact the final clamping force.

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 tool used to apply a specific amount of torque to fasteners.

  • Accurate torque readings
  • Various size drives available (1/4", 3/8", 1/2")
Learn more

Socket Set

A set of sockets to fit various bolt and nut sizes.

  • Metric sizes
  • Standard (SAE) sizes
  • Various drive sizes to match the torque wrench
Learn more

Extension Bars

Extension bars provide additional reach when working with bolts in difficult locations.

  • Various lengths available
  • Multiple drive sizes to match your socket and torque wrench
Learn more

Universal Joints

Universal joints allow for access to bolts at angles that straight extensions may not access.

  • Various lengths and drive sizes
  • Allows the torque to be accurately transferred at a angle
Learn more
Service Procedures

3.5L Engine Bolt Torque Specifications

This procedure provides the recommended torque values for various bolts on the 3.5L engine found in 1998-2004 Chrysler Concordes.

  • Consult the torque chart for your specific fastener and its location.
  • Using the correct socket size, carefully tighten the fastener to the specified torque value with a torque wrench.
  • Ensure the torque wrench is correctly calibrated for accurate readings.
  • Double check the torque applied after the initial tightening.
View full procedure

Cylinder Head Bolt Torque Sequence

This procedure outlines the specific tightening sequence for the cylinder head bolts. This is very important for proper sealing of the head.

  • Locate the correct cylinder head bolt torque sequence for the 3.5l engine.
  • Following that sequence, pre-torque the cylinder head bolts to the first torque value using the correct size socket.
  • Once the first round is complete in proper sequence, repeat the procedure at the second torque value.
  • Finally, repeat procedure again at the final specified torque value.
View full procedure
Technical Service Bulletins

Oil Pan Leaks on 3.5L Engines

2001-05-15

Some 3.5L engines may exhibit oil pan leaks due to improper torque or sealant application during assembly. Improper torque can cause pan deformation or premature gasket failure.

1998-2001

Resolution: Inspect the oil pan for warpage. Replace the gasket if damaged or worn. Ensure the oil pan bolts are torqued to the specified value in the proper sequence.

Intake Manifold Gasket Leaks

2003-11-20

Some 3.5L engines may experience intake manifold gasket leaks. Improper torqueing can cause leaks. Additionally, worn gaskets may be the culprit.

2000-2004

Resolution: Check the intake manifold bolts for proper torque. Replace the gasket as needed. When replacing, tighten the manifold bolts to the specified values following the proper sequence.

About the Author

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Alan Montanye - Automotive Technical Specialist
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Alan Montanye

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