Infiniti G37 2009-2013 3.7L V6 Engine Bolt Torque Specifications & Fastener Values
Infiniti G37 2009-2013

Infiniti G37 2009-2013 3.7L V6 Engine Bolt Torque Specifications

Detailed bolt torque specifications for the 3.7L V6 engine in the 2009-2013 Infiniti G37. Includes cylinder head, main bearing, connecting rod, and other critical 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

The cylinder head system includes components that seal the combustion chamber, manage airflow, and support valve operation. Proper torque ensures sealing, compression, and engine performance.

1

Cylinder Head Bolts

M10 x 1.5
Important Notes
Follow the manufacturer's torque sequence for cylinder head bolts. Ensure the engine is at room temperature during installation.
2

Rocker Arms/Shafts Bolts

M8 x 1.25
Torque Value
19 ft-lbs (26 N·m)
Important Notes
Ensure rocker arms are properly aligned before tightening.

Crankshaft And Bearings

This subsystem includes components that support and align the crankshaft, ensuring smooth rotation and power transfer.

1

Main Bearing Bolts

M12 x 1.75
Torque Value
65 ft-lbs (88 N·m)
Important Notes
Follow the manufacturer's torque sequence for main bearing bolts. Ensure proper alignment of bearings.
2

Connecting Rod Nuts

M9 x 1.0
Torque Value
48 ft-lbs (65 N·m)
Important Notes
Ensure connecting rods are properly aligned with the crankshaft journals.

Timing System

The timing system ensures proper synchronization of the crankshaft and camshaft, controlling valve timing and engine operation.

1

Timing Chain Tensioner Bolt

M8 x 1.25
Torque Value
36 ft-lbs (49 N·m)
Important Notes
Ensure the tensioner is properly seated before tightening.
2

Camshaft Sprocket Bolt

M12 x 1.75
Torque Value
97 ft-lbs (132 N·m)
Important Notes
Ensure the camshaft sprocket is properly aligned with the timing marks.

Intake And Exhaust

This subsystem includes components that manage air intake and exhaust flow, ensuring proper engine breathing and performance.

1

Intake Manifold Bolts

M8 x 1.25
Torque Value
19 ft-lbs (26 N·m)
Important Notes
Follow the manufacturer's torque sequence for intake manifold bolts.
2

Exhaust Manifold/Headers Bolts

M10 x 1.5
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Ensure the exhaust manifold is properly aligned before tightening.

Lubrication System

The lubrication system ensures proper oil circulation, preventing engine wear and overheating.

1

Oil Pan Bolts

M6 x 1.0
Torque Value
7 ft-lbs (9 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
28 ft-lbs (38 N·m)
Important Notes
Replace the crush washer during installation to prevent leaks.

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 2009-2013 Infiniti G37 3.7L V6 engine?

The cylinder head bolts on the 3.7L 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 refer to the service manual for the exact sequence and specifications.

Q2

How often should I check the torque on engine components?

Torque checks are typically performed during major maintenance intervals, such as when replacing gaskets, seals, or after engine repairs. For the 3.7L V6 engine, it's recommended to check torque specifications after the first 500 miles of driving post-repair to ensure bolts have not loosened.

Q3

Can I reuse head bolts on the 3.7L V6 engine?

No, the cylinder head bolts on the 3.7L V6 engine are torque-to-yield (TTY) bolts and should not be reused. They are designed to stretch during installation and must be replaced with new bolts to ensure proper clamping force and prevent leaks or engine damage.

Q4

What happens if I over-torque engine bolts?

Over-torquing can lead to bolt failure, stripped threads, or damage to engine components. For example, over-torquing cylinder head bolts can warp the head or cause gasket failure, leading to coolant or oil leaks. Always use a calibrated torque wrench and follow the manufacturer's specifications.

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 torque 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 the 3.7L V6 engine
  • Includes torque specifications for all critical bolts
Learn more
Service Procedures

Cylinder Head Bolt Torque Procedure

Detailed steps for torquing cylinder head bolts on the 3.7L V6 engine.

  • Clean the bolt threads and bolt holes thoroughly.
  • Apply a small amount of engine oil to the bolt threads.
  • Tighten bolts in the specified sequence to the initial torque value.
  • Use a torque angle gauge to apply the final torque-to-yield specification.
View full procedure

Main Bearing Cap Bolt Torque Procedure

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

  • Install the main bearing caps in their correct positions.
  • Lubricate the bolt threads with engine oil.
  • Tighten bolts in the specified sequence to the initial torque value.
  • Apply the final torque-to-yield specification using a torque angle gauge.
View full procedure

Intake Manifold Bolt Torque Procedure

Steps for properly torquing intake manifold bolts on the 3.7L V6 engine.

  • Position the intake manifold onto the engine block.
  • Hand-tighten all bolts to ensure proper alignment.
  • Tighten bolts in the specified sequence to the recommended torque value.
View full procedure
Technical Service Bulletins

Cylinder Head Bolt Torque Specification Update

2011-05-15

Updated torque specifications for cylinder head bolts to prevent engine leaks.

2009-2013 Infiniti G37

Resolution: Follow the revised torque sequence and specifications provided in the bulletin.

Main Bearing Cap Bolt Failure Notice

2012-08-22

Reports of main bearing cap bolt failures due to incorrect torque application.

2009-2013 Infiniti G37

Resolution: Ensure proper lubrication and torque-to-yield application during assembly.

Intake Manifold Bolt Torque Correction

2010-03-10

Correction to the torque specifications for intake manifold bolts to prevent air leaks.

2009-2013 Infiniti G37

Resolution: Use the updated torque values and sequence provided in the bulletin.

About the Author

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Alan Montanye - Automotive Technical Specialist
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Alan Montanye

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