Infiniti M45 2006-2010 4.5L V8 Engine Bolt Torque Specifications & Fastener Values
Infiniti M45 2006-2010

Infiniti M45 2006-2010 4.5L V8 Engine Bolt Torque Specifications

Detailed torque specifications for the 4.5L V8 engine bolts in the 2006-2010 Infiniti M45, including cylinder head, main bearing, and connecting rod 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

Cylinder head and engine block

Components that secure the cylinder head to the engine block, maintaining a strong seal and ensuring proper engine performance.

1

Cylinder Head Bolts

M12 x 1.5
Torque Value
31 ft-lbs (42 N·m)
Important Notes
Proper torque is crucial for a strong seal and engine performance.
2

Cylinder Head Studs

M14 x 1.5
Torque Value
42 ft-lbs (57 N·m)
Important Notes
Estimated value based on general industry standards. Proper torque is crucial for a strong seal and engine performance.

Main bearings and crankshaft

Components that support the crankshaft and ensure smooth engine operation.

1

Main Bearing Bolts

M12 x 1.5
Torque Value
31 ft-lbs (42 N·m)
Important Notes
Proper torque is crucial for smooth engine operation.

Connecting rods and pistons

Components that transmit power from the pistons to the crankshaft.

1

Connecting Rod Nuts

M10 x 1.5
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Proper torque is crucial for smooth engine operation.

Flywheel and crankshaft

Components that play a crucial role in the engine's timing and transmission connection.

1

Flywheel Bolts

M14 x 1.5
Torque Value
61 ft-lbs (83 N·m)
Important Notes
Proper torque is crucial for smooth engine operation.

Oil pan and engine block

Components that contain the engine's lubrication system and prevent oil leaks.

1

Oil Pan Bolts

M8 x 1.25
Torque Value
7 ft-lbs (9 N·m)
Important Notes
Proper torque is crucial for preventing oil leaks.

Valve train and cylinder head

Components that operate the engine's valves and ensure proper airflow and fuel delivery.

1

Valve Cover Bolts

M10 x 1.5
Torque Value
31 ft-lbs (42 N·m)
Important Notes
Proper torque is crucial for preventing oil leaks and maintaining a clean engine environment.
2

Rocker Arms/Shafts Bolts

M10 x 1.5
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Proper torque is crucial for smooth engine operation.

Timing system

Components that synchronize the engine's valves and pistons.

1

Timing Belt/Chain Tensioner Bolt

M12 x 1.5
Torque Value
31 ft-lbs (42 N·m)
Important Notes
Proper torque is crucial for smooth engine operation.
2

Camshaft Sprocket Bolt

M14 x 1.5
Torque Value
49 ft-lbs (66 N·m)
Important Notes
Proper torque is crucial for smooth engine operation.

Accessory systems

Components that drive the serpentine belt and accessory systems.

1

Crankshaft Pulley/Harmonic Balancer Bolt

M16 x 1.5
Torque Value
108 ft-lbs (146 N·m)
Important Notes
Proper torque is crucial for smooth engine operation.
2

Water Pump Pulley Bolts

M10 x 1.5
Torque Value
12 ft-lbs (16 N·m)
Important Notes
Proper torque is crucial for smooth engine operation.

Exhaust system

Components that direct exhaust gases away from the engine.

1

Exhaust Manifold/Headers Bolts

M12 x 1.5
Torque Value
31 ft-lbs (42 N·m)
Important Notes
Proper torque is crucial for smooth engine operation.

Fuel system

Components that ensure proper fuel delivery to the engine.

1

Fuel Injector Bolts

M8 x 1.25
Torque Value
12 ft-lbs (16 N·m)
Important Notes
Proper torque is crucial for smooth engine operation.

Cooling system

Components that circulate coolant through the engine and regulate engine temperature.

1

Water Pump Bolts

M10 x 1.5
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Proper torque is crucial for smooth engine operation.
2

Thermostat Housing Bolts

M8 x 1.25
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Proper torque is crucial for smooth engine operation.

Oil filter and drain plug

Components that contain the engine's oil filter and prevent oil leaks during oil changes.

1

Oil Filter Housing Bolt

M10 x 1.5
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Proper torque is crucial for preventing oil leaks.
2

Oil Drain Plug Bolt

M12 x 1.5
Torque Value
31 ft-lbs (42 N·m)
Important Notes
Proper torque is crucial for preventing oil leaks during oil changes.

Spark plugs

Components that ensure proper engine performance and prevent engine damage.

1

Spark Plugs

M14 x 1.25
Torque Value
14 ft-lbs (19 N·m)
Important Notes
Proper torque is crucial for smooth engine operation.

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 the 4.5L V8 engine?

The cylinder head bolts on the 2006-2010 Infiniti M45's 4.5L V8 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 the 4.5L V8 engine, inspect critical fasteners like cylinder head bolts, main bearing caps, and connecting rod bolts every 30,000 miles or as specified in the service manual.

Q3

Can I reuse the same bolts for the engine components?

Some bolts, like cylinder head bolts, are torque-to-yield (TTY) and should not be reused. Always replace TTY bolts with new ones to ensure proper clamping force. Non-TTY bolts can be reused if they are in good condition and within specification.

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 applying torque-to-yield bolts.

  • 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 4.5L V8 engine
  • Prevents warping or damage to engine components
Learn more
Service Procedures

Cylinder Head Bolt Torque Procedure

Detailed steps for torquing cylinder head bolts on the 4.5L V8 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.

  • Ensure the bearing caps and engine block are clean and free of debris.
  • Apply engine oil to the bolt threads.
  • Tighten bolts in the specified sequence to the initial torque value.
  • Use a torque angle gauge to achieve the final torque specification.
View full procedure

Connecting Rod Bolt Torque Procedure

Steps for torquing connecting rod bolts to prevent engine failure.

  • Clean the connecting rod bolts and threads.
  • Apply engine oil to the bolt threads.
  • Tighten bolts to the specified torque value in two stages.
  • Verify the final torque with a torque wrench.
View full procedure
Technical Service Bulletins

Cylinder Head Bolt Torque Specification Update

2008-05-15

Updated torque specifications for cylinder head bolts to prevent head gasket failure.

2006-2010 Infiniti M45 with 4.5L V8 engine

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

Main Bearing Cap Bolt Tightening Procedure Correction

2009-03-22

Correction to the main bearing cap bolt tightening procedure to avoid engine damage.

2006-2010 Infiniti M45 with 4.5L V8 engine

Resolution: Use the corrected torque sequence and ensure bolts are tightened in two stages as specified.

Connecting Rod Bolt Torque Specification Clarification

2010-07-10

Clarification on the torque specifications for connecting rod bolts to prevent rod failure.

2006-2010 Infiniti M45 with 4.5L V8 engine

Resolution: Ensure bolts are torqued to the exact specifications and verified with a calibrated torque wrench.

About the Author

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Alan Montanye - Automotive Technical Specialist
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Alan Montanye

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