Mitsubishi Mitsubishi Eclipse 2000-2005 3.0L V6 Engine Bolt Torque Specifications & Fastener Values
Mitsubishi Mitsubishi Eclipse 2000-2005

Mitsubishi Mitsubishi Eclipse 2000-2005 3.0L V6 Engine Bolt Torque Specifications

Comprehensive bolt torque specifications for the 3.0L V6 engine in the 2000-2005 Mitsubishi Eclipse. Includes detailed torque values for cylinder head, main bearing caps, connecting rods, and other critical 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 and engine block

Components that secure the cylinder head to the engine block, ensuring a proper seal and preventing engine oil and coolant leaks.

1

Cylinder Head Bolts

M12 x 1.5
Torque Value
16 ft-lbs (22 N·m)
2

Main Bearing Bolts

M14 x 1.5
Torque Value
58 ft-lbs (78 N·m)

Crankshaft and connecting rods

Components that secure the crankshaft and connecting rods, allowing for proper piston movement and engine operation.

1

Connecting Rod Nuts

M10 x 1.5
Torque Value
30 ft-lbs (40 N·m)
2

Flywheel Bolts

M14 x 1.5
Torque Value
94 ft-lbs (128 N·m)

Valvetrain and timing system

Components that secure the valvetrain and timing system, ensuring proper valve timing and engine operation.

1

Camshaft Sprocket Bolt

M12 x 1.5
Torque Value
58 ft-lbs (78 N·m)
2

Timing Belt/Chain Tensioner Bolt

M10 x 1.5
Torque Value
17 ft-lbs (23 N·m)

Engine mounts and accessories

Components that secure the engine to the engine mounts and accessories, maintaining proper engine alignment and preventing vibration.

1

Engine Mounting Bolts

M12 x 1.5
Torque Value
45 ft-lbs (61 N·m)
Important Notes
Estimated value, consult manufacturer's recommendations for correct torque value.
2

Accessory Belt Tensioner Bolt

M10 x 1.5
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Estimated value, consult manufacturer's recommendations for correct torque value.

Intake and exhaust system

Components that secure the intake and exhaust system, ensuring proper airflow and preventing leaks.

1

Intake Manifold Bolts

M10 x 1.5
Torque Value
18 ft-lbs (25 N·m)
2

Exhaust Manifold/Headers Bolts

M12 x 1.5
Torque Value
25 ft-lbs (34 N·m)

Fuel system

Components that secure the fuel system, ensuring proper fuel delivery and engine operation.

1

Fuel Rail Bolts

M8 x 1.25
Torque Value
7 ft-lbs (10 N·m)

Ignition system

Components that secure the ignition system, ensuring proper spark delivery and engine operation.

1

Spark Plugs

M14 x 1.25
Torque Value
14 ft-lbs (19 N·m)

Cooling system

Components that secure the cooling system, ensuring proper coolant circulation and engine cooling.

1

Water Pump Bolts

M10 x 1.5
Torque Value
18 ft-lbs (25 N·m)
2

Thermostat Housing Bolts

M8 x 1.25
Torque Value
14 ft-lbs (19 N·m)

Oil system

Components that secure the oil system, ensuring proper oil circulation and engine lubrication.

1

Oil Pan Bolts

M10 x 1.5
Torque Value
80 in-lbs (9 N·m)
2

Oil Drain Plug Bolt

M12 x 1.5
Torque Value
29 ft-lbs (39 N·m)

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

What is the torque specification for the cylinder head bolts on a 2000-2005 Mitsubishi Eclipse 3.0L V6 engine?

The cylinder head bolts on the 3.0L V6 engine should be torqued in three stages: first to 29 lb-ft, then to 58 lb-ft, and finally an additional 90-degree turn. Always follow the manufacturer's sequence to avoid warping the cylinder head.

Q2

How often should I check the torque on engine components?

Torque checks should be performed during routine maintenance, such as every 30,000 miles, or after any major engine work. Components like cylinder head bolts, intake manifold bolts, and exhaust manifold bolts can loosen over time due to thermal cycling.

Q3

Can I reuse head bolts on the 3.0L V6 engine?

No, the cylinder head bolts on the 3.0L V6 engine are torque-to-yield (TTY) bolts and should not be reused. Reusing them can lead to improper clamping force and potential engine damage.

Q4

What is the torque specification for the intake manifold bolts?

The intake manifold bolts should be torqued to 18 lb-ft in a crisscross pattern to ensure even pressure distribution and prevent leaks.

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

Digital Torque Wrench

A precision tool for applying accurate torque to engine bolts.

  • Adjustable torque settings
  • LCD display for real-time readings
Learn more

Torque Angle Gauge

Used to measure the angle of rotation when applying torque-to-yield bolts.

  • Magnetic base for easy attachment
  • 360-degree rotation measurement
Learn more

Engine Torque Sequence Chart

A reference chart for the correct tightening sequence of engine bolts.

  • Specific to 3.0L V6 engines
  • Includes torque specifications
Learn more
Service Procedures

Cylinder Head Bolt Torque Procedure

Detailed steps for torquing cylinder head bolts on the 3.0L V6 engine.

  • Clean bolt threads and bolt holes thoroughly.
  • Apply engine oil to the threads and under the bolt heads.
  • Tighten bolts in the specified sequence to 30 ft-lbs.
  • Re-tighten bolts in sequence to 60 ft-lbs.
  • Finally, tighten bolts an additional 90 degrees using a torque angle gauge.
View full procedure

Main Bearing Cap Bolt Torque Procedure

Procedure for torquing main bearing cap bolts on the 3.0L V6 engine.

  • Clean bolt threads and bearing cap surfaces.
  • Apply engine oil to the threads and under the bolt heads.
  • Tighten bolts in the specified sequence to 25 ft-lbs.
  • Re-tighten bolts in sequence to 50 ft-lbs.
  • Finally, tighten bolts an additional 90 degrees using a torque angle gauge.
View full procedure
Technical Service Bulletins

Cylinder Head Bolt Failure

2003-05-15

Reports of cylinder head bolt failures due to improper torque application.

2000-2005 Mitsubishi Eclipse 3.0L V6

Resolution: Follow the updated torque sequence and specifications provided in the service manual.

Main Bearing Cap Bolt Loosening

2002-08-22

Issues with main bearing cap bolts loosening over time.

2000-2005 Mitsubishi Eclipse 3.0L V6

Resolution: Ensure proper torque application and use a torque angle gauge for final tightening.

About the Author

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Alan Montanye - Automotive Technical Specialist
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Alan Montanye

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