Infiniti G35 2003-2006 3.5L V6 Engine Bolt Torque Specifications & Fastener Values
Infiniti G35 2003-2006

Infiniti G35 2003-2006 3.5L V6 Engine Bolt Torque Specifications

Detailed torque specifications for the 3.5L V6 engine bolts in the 2003-2006 Infiniti G35. Includes cylinder head, main bearing, connecting rod, and other critical bolt torque values.

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 that secure the cylinder head to the engine block and associated components.

1

Cylinder Head Bolts

M10 x 1.25
Important Notes
Follow the manufacturer's specified torque sequence to ensure even clamping force.
2

Valve Cover Bolts

M6 x 1.0
Torque Value
4 ft-lbs (5.4 N·m)
Important Notes
Ensure the valve cover gasket is properly seated before tightening.

Crankshaft And Bearings

Components related to the crankshaft, including main bearing caps and connecting rod bolts.

1

Main Bearing Bolts

M12 x 1.5
Torque Value
58 ft-lbs (79 N·m)
Important Notes
Ensure proper alignment of the main bearing caps before tightening.
2

Connecting Rod Nuts

M8 x 1.25
Torque Value
29 ft-lbs (39 N·m)
Important Notes
Ensure proper alignment of the connecting rod caps before tightening.

Timing System

Components related to the timing system, including timing belt/chain tensioners and camshaft sprockets.

1

Timing Belt/Chain Tensioner Bolt

M10 x 1.25
Torque Value
35 ft-lbs (47 N·m)
Important Notes
Ensure proper tension on the timing belt/chain before tightening.
2

Camshaft Sprocket Bolt

M12 x 1.25
Torque Value
65 ft-lbs (88 N·m)
Important Notes
Ensure proper alignment of the camshaft sprocket before tightening.

Intake And Exhaust

Components related to the intake and exhaust manifolds, including bolts and fasteners.

1

Intake Manifold Bolts

M8 x 1.25
Torque Value
19 ft-lbs (26 N·m)
Important Notes
Ensure proper alignment of the intake manifold before tightening.
2

Exhaust Manifold Bolts

M10 x 1.25
Torque Value
32 ft-lbs (43 N·m)
Important Notes
Ensure proper alignment of the exhaust manifold before tightening.

Accessories

Components related to engine accessories, including alternator, starter motor, and A/C compressor.

1

Starter Motor Mounting Bolts

M10 x 1.25
Torque Value
29 ft-lbs (39 N·m)
Important Notes
Ensure proper alignment of the starter motor before tightening.
2

Alternator Mounting Bolts

M10 x 1.25
Torque Value
29 ft-lbs (39 N·m)
Important Notes
Ensure proper alignment of the alternator before tightening.

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 are the torque specifications for the cylinder head bolts on a 2003-2006 Infiniti G35 3.5L V6 engine?

The cylinder head bolts on the 3.5L V6 engine should be torqued in a specific sequence to 29 ft-lbs (39 Nm) initially, then tightened an additional 90 degrees, and finally another 90 degrees. Always follow the manufacturer's sequence to avoid warping the cylinder head.

Q2

How often should I check the torque on engine components like the intake manifold?

It's recommended to check the torque on critical engine components, such as the intake manifold, during major service intervals (e.g., every 60,000 miles) or if you notice symptoms like vacuum leaks or unusual engine performance. The intake manifold bolts should be torqued to 14 ft-lbs (19 Nm).

Q3

Can I reuse head bolts on the 3.5L V6 engine?

No, the cylinder head bolts on the 3.5L V6 engine are torque-to-yield (TTY) bolts and should not be reused. They are designed to stretch during installation, and reusing them can lead to improper clamping force and potential engine damage.

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 precision tool used to apply a specific torque to a fastener such as a bolt or nut.

  • Adjustable torque settings
  • Durable construction for accurate readings
Learn more

Socket Set

A set of sockets and accessories for use with a torque wrench.

  • Includes various socket sizes
  • Compatible with torque wrench
Learn more

Thread Locker

A chemical compound used to secure bolts and prevent them from loosening due to vibration.

  • High-strength formula
  • Temperature resistant
Learn more
Service Procedures

Cylinder Head Bolt Torque Procedure

Detailed steps for properly torquing the cylinder head bolts on the 3.5L V6 engine.

  • Clean the bolt threads and bolt holes thoroughly.
  • Apply a small amount of engine oil to the bolt threads and under the bolt heads.
  • Tighten the bolts in the specified sequence to the initial torque setting.
  • Turn each bolt an additional specified angle in the correct sequence.
  • Double-check the final torque values to ensure accuracy.
View full procedure

Main Bearing Cap Bolt Torque Procedure

Steps for torquing the main bearing cap bolts to ensure proper engine assembly.

  • Clean the bolt threads and bolt holes.
  • Apply engine oil to the bolt threads and under the bolt heads.
  • Tighten the bolts in the specified sequence to the initial torque setting.
  • Turn each bolt an additional specified angle in the correct sequence.
  • Verify the final torque values.
View full procedure

Intake Manifold Bolt Torque Procedure

Procedure for torquing the intake manifold bolts to prevent leaks and ensure proper sealing.

  • Clean the bolt threads and bolt holes.
  • Apply thread locker to the bolt threads.
  • Tighten the bolts in the specified sequence to the initial torque setting.
  • Double-check the torque values to ensure proper sealing.
View full procedure
Technical Service Bulletins

Cylinder Head Bolt Torque Specification Update

2005-03-15

Updated torque specifications for cylinder head bolts to address potential engine leaks.

2003-2006 Infiniti G35 with 3.5L V6 engine

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

Main Bearing Cap Bolt Torque Specification Revision

2004-08-20

Revised torque specifications for main bearing cap bolts to prevent engine damage.

2003-2006 Infiniti G35 with 3.5L V6 engine

Resolution: Use the revised torque values and sequence during engine assembly.

Intake Manifold Bolt Torque Specification Clarification

2006-05-10

Clarification on the correct torque specifications for intake manifold bolts to prevent air leaks.

2003-2006 Infiniti G35 with 3.5L V6 engine

Resolution: Ensure the correct torque values and sequence are followed during installation.

About the Author

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Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

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