Infiniti Q45 1997-2001 Drivetrain Bolt Torque Specifications & Fastener Values
Infiniti Q45 1997-2001

Infiniti Q45 1997-2001 Drivetrain Bolt Torque Specifications

Detailed torque specifications for the drivetrain bolts of the 1997-2001 Infiniti Q45, including axle nuts, driveshaft bolts, and differential 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 block and main bearings

Components that secure the main bearings to the engine block, supporting the crankshaft and ensuring proper engine operation.

1

Main Bearing Bolts

M14 x 1.5
Torque Value
65 ft-lbs (88 N·m)
Important Notes
Torque value is an average of the specified range.

Crankshaft and connecting rods

Components that secure the connecting rods to the crankshaft, maintaining the integrity of the engine's rotating assembly.

1

Connecting Rod Nuts

M12 x 1.25
Torque Value
45 ft-lbs (61 N·m)
Important Notes
Torque value is an average of the specified range.

Flywheel and crankshaft pulley

Components that secure the flywheel to the crankshaft and the crankshaft pulley to the crankshaft.

1

Flywheel Bolts

M16 x 1.5
Torque Value
97 ft-lbs (132 N·m)
Important Notes
Torque value is an average of the specified range.
2

Crankshaft Pulley/Harmonic Balancer Bolt

M18 x 1.5
Torque Value
91 ft-lbs (123 N·m)
Important Notes
Torque value is an average of the specified range.

Transmission and mounting

Components that secure the transmission to the engine or transmission crossmember.

1

Transmission Mounting Bolts

M14 x 1.5
Torque Value
50 ft-lbs (68 N·m)
Important Notes
Torque value is an average of the specified range.
2

Engine Block to Transmission Bellhousing Bolts

M12 x 1.25
Torque Value
45 ft-lbs (61 N·m)
Important Notes
Estimated torque value.
3

Transmission Crossmember Bolts

M14 x 1.5
Torque Value
45 ft-lbs (61 N·m)
Important Notes
Estimated torque value.

Drivetrain and axles

Components that secure the drivetrain and axles to the transmission or differential.

1

Drive Axle/Half Shaft Bolts

M16 x 1.5
Torque Value
50 ft-lbs (68 N·m)
Important Notes
Torque value is an average of the specified range.
2

CV Joint/Axle Nut

M20 x 1.5
Torque Value
188 ft-lbs (255 N·m)
Important Notes
Torque value is an average of the specified range.
3

Propeller/Drive Shaft Bolts

M18 x 1.5
Torque Value
59 ft-lbs (80 N·m)
Important Notes
Torque value is an average of the specified range.
4

Axle Shaft to Differential Bolts

M16 x 1.5
Torque Value
45 ft-lbs (61 N·m)
Important Notes
Estimated torque value.

Transmission oil pan and drain/fill plugs

Components that secure the oil pan to the transmission and allow for transmission fluid changes and maintenance.

1

Transmission Oil Pan Bolts

M10 x 1.25
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Torque value is an average of the specified range.
2

Transmission Drain and Fill Plugs

M12 x 1.25
Torque Value
36 ft-lbs (49 N·m)
Important Notes
Torque value is an average of the specified range.

Differential cover

Components that secure the differential cover to the differential housing.

1

Differential Cover Bolts

M12 x 1.25
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Estimated torque value.

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 driveshaft bolts on a 1997-2001 Infiniti Q45?

The driveshaft bolts on the 1997-2001 Infiniti Q45 should be torqued to 22-29 ft-lbs (30-39 Nm). Ensure the bolts are clean and free of debris before installation, and use a calibrated torque wrench for accuracy.

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 mounting bolts, every 30,000 miles or during routine maintenance. Loose bolts can lead to vibrations, noise, or even component failure.

Q3

Can I reuse the same bolts when servicing the drivetrain?

It is generally not recommended to reuse bolts, especially torque-to-yield (TTY) bolts, as they may lose their clamping force. Always refer to the service manual for specific guidance. For non-TTY bolts, inspect them for wear, stretching, or damage before reuse.

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 for loosening tight bolts before torque application.

  • Durable construction
  • Extended leverage for ease of use
Learn more

Thread Locker

A chemical compound to secure bolts and prevent loosening over time.

  • High-strength formula
  • Resistant to vibration and heat
Learn more
Service Procedures

Driveshaft Bolt Torque Specification Application

Procedure to apply the correct torque to driveshaft bolts on a 1997-2001 Infiniti Q45.

  • Lift the vehicle securely using a hydraulic jack and place 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 the specified torque of 45-55 ft-lbs.
  • Double-check the torque settings and ensure all bolts are evenly tightened.
View full procedure

Transmission Mount Bolt Torque Specification Application

Procedure to apply the correct torque to transmission mount bolts on a 1997-2001 Infiniti Q45.

  • Lift the vehicle securely using a hydraulic jack and place it on jack stands.
  • Locate the transmission mount bolts securing the transmission to the chassis.
  • Clean the bolt threads and apply a small amount of thread locker.
  • Using a torque wrench, tighten the bolts to the specified torque of 35-45 ft-lbs.
  • Double-check the torque settings and ensure all bolts are evenly tightened.
View full procedure
Technical Service Bulletins

Drivetrain Vibration and Noise Concerns

2000-05-15

Some 1997-2001 Infiniti Q45 models may experience drivetrain vibrations or noises due to improperly torqued driveshaft bolts.

1997-2001 Infiniti Q45

Resolution: Inspect and re-torque all driveshaft bolts to the specified torque of 45-55 ft-lbs. Ensure thread locker is applied to prevent loosening.

Transmission Mount Bolt Loosening

1999-08-20

Reports of transmission mount bolts loosening over time, leading to drivetrain misalignment and noise.

1997-2001 Infiniti Q45

Resolution: Re-torque transmission mount bolts to 35-45 ft-lbs and apply thread locker to secure the bolts.

About the Author

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Alan Montanye - Automotive Technical Specialist
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Alan Montanye

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