Infiniti QX56 2011-2013 5.6L V8 Engine Bolt Torque Specifications & Fastener Values
Infiniti QX56 2011-2013

Infiniti QX56 2011-2013 5.6L V8 Engine Bolt Torque Specifications

Comprehensive bolt torque specifications for the 5.6L V8 engine in the 2011-2013 Infiniti QX56. Includes detailed torque values for cylinder head, main bearing, connecting rod, and other critical engine components.

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

This subsystem includes the cylinder head, engine block, and related components that ensure proper engine operation and sealing.

1

Cylinder Head Bolts

M12 x 1.5
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Tighten in a star pattern to ensure even sealing.
2

Engine Block to Transmission Mounting Bolts

M14 x 1.5
Torque Value
40 ft-lbs (54 N·m)
Important Notes
Estimated value based on industry standards.
3

Engine Block to Engine Mounting Bolts

M12 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Estimated value based on industry standards.
4

Cylinder Head to Engine Block Studs

M14 x 1.5
Torque Value
40 ft-lbs (54 N·m)
Important Notes
Estimated value based on industry standards.

Main bearings and crankshaft

This subsystem includes the main bearings, crankshaft, and related components that support the engine's rotating assembly.

1

Main Bearing Bolts

M16 x 1.5
Torque Value
77 ft-lbs (105 N·m)
Important Notes
Tighten in a star pattern to ensure even bearing loading.
2

Crankshaft Pulley/Harmonic Balancer Bolt

M18 x 1.5
Torque Value
108 ft-lbs (147 N·m)
Important Notes
Tighten in a star pattern to ensure even pulley loading.

Valvetrain and cylinder head

This subsystem includes the valvetrain, cylinder head, and related components that control engine airflow and combustion.

1

Valve Cover Bolts

M10 x 1.5
Torque Value
53 ft-lbs (6 N·m)
Important Notes
Tighten in a star pattern to ensure even valve cover sealing.
2

Rocker Arms/Shafts Bolts

M12 x 1.5
Torque Value
19 ft-lbs (26 N·m)
Important Notes
Tighten in a star pattern to ensure even rocker arm loading.

Intake and exhaust systems

This subsystem includes the intake manifold, exhaust manifold, and related components that control engine airflow and exhaust gas flow.

1

Intake Manifold Bolts

M10 x 1.5
Torque Value
13 ft-lbs (18 N·m)
Important Notes
Tighten in a star pattern to ensure even intake manifold sealing.
2

Exhaust Manifold/Headers Bolts

M12 x 1.5
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Tighten in a star pattern to ensure even exhaust manifold sealing.

Accessories and ancillaries

This subsystem includes the accessories and ancillaries that support engine operation, such as the water pump, oil filter, and throttle body.

1

Water Pump Bolts

M10 x 1.5
Torque Value
12 ft-lbs (16 N·m)
Important Notes
Tighten in a star pattern to ensure even water pump sealing.
2

Oil Filter Cap

M12 x 1.5
Torque Value
0 ft-lbs (0 N·m)
Important Notes
Hand tighten only.

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 the 5.6L V8 engine?

The cylinder head bolts on the 2011-2013 Infiniti QX56 5.6L V8 engine should be torqued in three stages: first to 29 ft-lbs, then to 51 ft-lbs, and finally an additional 90-degree turn. Always follow the manufacturer's sequence to avoid warping or damage to 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 5.6L V8 engine, it's recommended to inspect torque specifications every 30,000 miles or if you notice symptoms like oil leaks, unusual noises, or reduced performance.

Q3

Can I reuse head bolts on the 5.6L V8 engine?

No, the cylinder head bolts on the 5.6L V8 engine are torque-to-yield (TTY) bolts and should not be reused. Reusing them can lead to improper clamping force, which may cause head gasket failure or 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 bolts.

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

Torque Angle Gauge

Used to measure the angle of rotation during torque-to-yield applications.

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

Engine Hoist

Essential for lifting and positioning the engine during major repairs.

  • Adjustable boom length
  • Heavy-duty hydraulic system
Learn more
Service Procedures

Cylinder Head Bolt Torque Procedure

Detailed steps for torquing cylinder head bolts on the 5.6L V8 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 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.

  • Clean the bolt threads and bearing cap surfaces.
  • Apply 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
Technical Service Bulletins

Engine Bolt Torque Specifications Update

2012-05-15

Updated torque specifications for critical engine bolts on the 5.6L V8 engine.

2011-2013 Infiniti QX56

Resolution: Refer to the latest service manual for updated torque values and procedures.

Cylinder Head Bolt Failure Investigation

2013-08-22

Investigation into reports of cylinder head bolt failures on the 5.6L V8 engine.

2011-2013 Infiniti QX56

Resolution: Replace affected bolts and follow the updated torque procedure to prevent future failures.

About the Author

Expert automotive knowledge and experience

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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