Infiniti Q45 2002-2006 Drivetrain Bolt Torque Specifications & Fastener Values
Infiniti Q45 2002-2006

Infiniti Q45 2002-2006 Drivetrain Bolt Torque Specifications

Detailed torque specifications for the drivetrain components of the 2002-2006 Infiniti Q45, including driveshaft, differential, and axle bolts.

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

Engine and transmission interface

Components that secure the engine to the transmission, including the engine block to transmission bellhousing bolts.

1

Engine Block to Transmission Bellhousing Bolts

M14 x 1.5
Torque Value
45 ft-lbs (61 N·m)
Important Notes
Estimated value based on general industry standards.

Transmission mounting

Components that secure the transmission to the engine block or crossmember, including the transmission mounting bolts and transmission crossmember bolts.

1

Transmission Mounting Bolts

M12 x 1.25
Torque Value
35 ft-lbs (47 N·m)
2

Transmission Crossmember Bolts

M14 x 1.5
Torque Value
55 ft-lbs (75 N·m)
Important Notes
Estimated value based on general industry standards.

Flywheel and crankshaft

Components that secure the flywheel to the crankshaft, including the flywheel bolts and crankshaft pulley/harmonic balancer bolt.

1

Flywheel Bolts

M10 x 1.25
Torque Value
80 ft-lbs (108 N·m)
2

Crankshaft Pulley/Harmonic Balancer Bolt

M14 x 1.5
Torque Value
127 ft-lbs (172 N·m)

Transmission oil pan

Components that secure the transmission oil pan to the transmission, including the transmission oil pan bolts.

1

Transmission Oil Pan Bolts

M8 x 1.25
Torque Value
88 in-lbs (10 N·m)

Drive axle and half shaft

Components that secure the drive axle/half shaft to the transmission or differential, including the drive axle/half shaft bolts and CV joint/axle nut.

1

Drive Axle/Half Shaft Bolts

M12 x 1.25
Torque Value
65 ft-lbs (88 N·m)
2

CV Joint/Axle Nut

M18 x 1.5
Torque Value
141 ft-lbs (191 N·m)

Propeller and drive shaft

Components that secure the propeller/drive shaft to the transmission or differential, including the propeller/drive shaft bolts.

1

Propeller/Drive Shaft Bolts

M14 x 1.5
Torque Value
65 ft-lbs (88 N·m)

Differential

Components that secure the differential cover to the differential, including the differential cover bolts and differential drain/fill plug.

1

Differential Cover Bolts

M10 x 1.25
Torque Value
35 ft-lbs (47 N·m)
Important Notes
Estimated value based on general industry standards.
2

Differential Drain/Fill Plug

M14 x 1.5
Torque Value
33 ft-lbs (45 N·m)

Axle and hub

Components that secure the axle/half shaft to the hub, including the axle/half shaft to hub bolts.

1

Axle/Half Shaft to Hub Bolts

M14 x 1.5
Torque Value
90 ft-lbs (122 N·m)
Important Notes
Estimated value based on general industry standards.

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 driveshaft bolts on a 2002-2006 Infiniti Q45?

The driveshaft bolts on a 2002-2006 Infiniti Q45 should be torqued to 25-30 Nm (18-22 ft-lbs). Ensure the bolts are tightened evenly and in a crisscross pattern to avoid misalignment.

Q2

How often should I check the torque on drivetrain components?

It is recommended to check the torque on drivetrain components, such as driveshaft bolts and differential bolts, every 30,000 miles or after any major service involving the drivetrain. This ensures proper alignment and prevents loosening due to vibrations.

Q3

Can I reuse the same bolts when servicing the drivetrain?

It is generally not recommended to reuse drivetrain bolts, as they are often torque-to-yield (TTY) bolts designed for one-time use. Reusing them can lead to improper torque and potential failure. Always consult the service manual or replace with OEM-specified bolts.

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 drivetrain bolts.

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

Breaker Bar

A long-handled tool used to loosen tight bolts before applying torque.

  • Durable construction
  • Extended leverage for added force
Learn more

Torque Angle Gauge

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

  • Easy-to-read scale
  • Compatible with most torque wrenches
Learn more
Service Procedures

Driveshaft Bolt Torque Specification

Procedure for applying the correct torque to driveshaft bolts.

  • Raise the vehicle and secure it on jack stands.
  • Locate the driveshaft bolts connecting the driveshaft to the differential.
  • Clean the bolt threads and apply a small amount of thread locker.
  • Using a torque wrench, tighten the bolts to 45-55 ft-lbs.
  • Double-check the torque setting with a second pass.
View full procedure

Transmission Mount Bolt Torque Specification

Procedure for applying the correct torque to transmission mount bolts.

  • Support the transmission with a jack and remove the transmission mount.
  • Clean the bolt threads and inspect for damage.
  • Install the transmission mount and hand-tighten the bolts.
  • Using a torque wrench, tighten the bolts to 35-45 ft-lbs.
  • Recheck the torque after 100 miles of driving.
View full procedure
Technical Service Bulletins

Drivetrain Vibration at Highway Speeds

2004-06-15

Some 2002-2006 Infiniti Q45 models may experience drivetrain vibrations at highway speeds due to improper driveshaft bolt torque.

2002-2006 Infiniti Q45

Resolution: Inspect and retorque the driveshaft bolts to the specified 45-55 ft-lbs. Replace any damaged bolts or components.

Transmission Mount Bolt Loosening

2005-03-22

Reports of transmission mount bolts loosening over time, causing drivetrain noise and vibration.

2002-2006 Infiniti Q45

Resolution: Retorque the transmission mount bolts to 35-45 ft-lbs and apply thread locker to prevent future loosening.

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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