Infiniti FX35 2003-2008 3.5L V6 Engine Bolt Torque Specifications & Fastener Values
Infiniti FX35 2003-2008

Infiniti FX35 2003-2008 3.5L V6 Engine Bolt Torque Specifications

Detailed torque specifications for the 3.5L V6 engine bolts in the 2003-2008 Infiniti FX35, including cylinder head, intake manifold, exhaust manifold, and other critical fasteners.

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

The cylinder head assembly includes components that seal the combustion chamber, manage airflow, and support valvetrain components. Proper torque is critical for sealing and engine performance.

1

Cylinder Head Bolts

M10 x 1.5
Important Notes
Follow the manufacturer's specified torque sequence to ensure even clamping force.
2

Valve Cover Bolts

M6 x 1.0
Torque Value
40 ft-lbs (54 N·m)
Important Notes
Ensure the valve cover gasket is properly seated before tightening.

Crankshaft And Bearings

The crankshaft and bearings subsystem includes components that support and align the crankshaft, ensuring smooth engine operation.

1

Main Bearing Bolts

M12 x 1.75
Torque Value
56 ft-lbs (76 N·m)
Important Notes
Follow the manufacturer's specified torque sequence to ensure proper crankshaft alignment.
2

Connecting Rod Nuts

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Ensure the connecting rod bearings are properly seated before tightening.

Timing System

The timing system includes components that synchronize the rotation of the crankshaft and camshaft, ensuring proper engine timing.

1

Timing Belt/Chain Tensioner Bolt

M8 x 1.25
Torque Value
28 ft-lbs (38 N·m)
Important Notes
Ensure the tensioner is properly aligned before tightening.
2

Camshaft Sprocket Bolt

M10 x 1.5
Torque Value
35 ft-lbs (47 N·m)
Important Notes
Ensure the sprocket is properly aligned with the camshaft.

Intake And Exhaust

The intake and exhaust system includes components that manage airflow into and out of the engine, ensuring proper combustion and emissions control.

1

Intake Manifold Bolts

M6 x 1.0
Torque Value
11 ft-lbs (15 N·m)
Important Notes
Follow the manufacturer's specified torque sequence to ensure a proper seal.
2

Exhaust Manifold/Headers Bolts

M8 x 1.25
Torque Value
14 ft-lbs (19 N·m)
Important Notes
Ensure the exhaust manifold gasket is properly seated before tightening.

Oil System

The oil system includes components that manage lubrication and oil circulation throughout the engine.

1

Oil Pan Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Ensure the oil pan gasket is properly seated before tightening.
2

Oil Drain Plug Bolt

M14 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Replace the crush washer to ensure a proper seal.

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 2003-2008 Infiniti FX35 3.5L V6 engine?

The cylinder head bolts on the 3.5L V6 engine should be torqued in three stages: first to 29 ft-lbs, then to 58 ft-lbs, 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 or after any major engine work. For example, after replacing the timing chain or head gasket, recheck the torque on related components after the engine has been run and cooled down to ensure proper seating.

Q3

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

No, the 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

Digital Torque Wrench

A precision tool for applying accurate torque to engine bolts.

  • Adjustable torque settings
  • Digital display for precise readings
Learn more

Torque Angle Gauge

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

  • Magnetic base for easy attachment
  • Clear angle markings for accuracy
Learn more

Engine Torque Sequence Diagram

A visual guide for the correct tightening sequence of engine bolts.

  • Specific to the 3.5L V6 engine
  • Prevents warping or damage during assembly
Learn more
Service Procedures

Cylinder Head Bolt Torque Procedure

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

  • Clean the bolt threads and bolt holes thoroughly.
  • Apply engine oil to the threads and under the bolt heads.
  • Tighten bolts in the specified sequence to 29 ft-lbs.
  • Turn each bolt an additional 90 degrees in the specified sequence.
  • Turn each bolt another 90 degrees in the specified sequence.
View full procedure

Main Bearing Cap Bolt Torque Procedure

Steps for torquing main bearing cap bolts on the 3.5L V6 engine.

  • Clean the bolt threads and bolt holes thoroughly.
  • Apply engine oil to the threads and under the bolt heads.
  • Tighten bolts in the specified sequence to 22 ft-lbs.
  • Turn each bolt an additional 60 degrees in the specified sequence.
View full procedure

Intake Manifold Bolt Torque Procedure

Steps for torquing intake manifold bolts on the 3.5L V6 engine.

  • Clean the bolt threads and bolt holes thoroughly.
  • Tighten bolts in the specified sequence to 14 ft-lbs.
View full procedure
Technical Service Bulletins

Cylinder Head Bolt Failure

2005-06-15

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

2003-2008 Infiniti FX35

Resolution: Ensure proper torque sequence and use of a torque angle gauge during assembly.

Main Bearing Cap Bolt Loosening

2006-03-22

Issues with main bearing cap bolts loosening over time.

2003-2008 Infiniti FX35

Resolution: Replace bolts with updated parts and follow the revised torque procedure.

Intake Manifold Leak

2007-11-10

Leaks reported due to improper torque on intake manifold bolts.

2003-2008 Infiniti FX35

Resolution: Re-torque intake manifold bolts to the specified 14 ft-lbs and inspect for damage.

About the Author

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Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

ASE Master Certified Technician with over a decade of hands-on experience in automotive repair and diagnostics.

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