Infiniti QX50 2019-present 2.0L Turbo I4 Engine Bolt Torque Specifications & Fastener Values
Infiniti QX50 2019-present

Infiniti QX50 2019-present 2.0L Turbo I4 Engine Bolt Torque Specifications

Detailed bolt torque specifications for the 2.0L Turbo I4 engine in the 2019-Present Infiniti QX50. Includes cylinder head, connecting rod, main bearing, and other critical fasteners.

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 is a critical component of the engine, responsible for sealing the combustion chamber and directing airflow and exhaust gases. Proper torque application is essential to prevent engine damage and ensure optimal performance.

1

Cylinder Head Bolts

M12 x 1.5
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Estimated value, consult engine manufacturer's specifications for accurate information.

Engine Block

The engine block is the main structural component of the engine, housing the cylinders, pistons, and crankshaft. Proper torque application is essential to prevent engine damage and ensure optimal performance.

1

Main Bearing Bolts

M14 x 1.5
Torque Value
41 ft-lbs (56 N·m)
2

Engine Block to Transmission Mounting Bolts

M16 x 1.5
Torque Value
45 ft-lbs (61 N·m)
Important Notes
Estimated value, consult engine manufacturer's specifications for accurate information.

Crankshaft

The crankshaft is a critical component of the engine, responsible for converting the up-and-down motion of the pistons into rotary motion. Proper torque application is essential to prevent engine damage and ensure optimal performance.

1

Connecting Rod Nuts

M10 x 1.5
Torque Value
26 ft-lbs (35 N·m)
2

Flywheel Bolts

M14 x 1.5
Torque Value
71 ft-lbs (96 N·m)

Valvetrain

The valvetrain is a critical component of the engine, responsible for operating the engine's valves. Proper torque application is essential to prevent engine damage and ensure optimal performance.

1

Valve Cover Bolts

M8 x 1.25
Torque Value
35 ft-lbs (47 N·m)
2

Rocker Arms/Shafts Bolts

M10 x 1.5
Torque Value
20 ft-lbs (27 N·m)

Timing System

The timing system is a critical component of the engine, responsible for synchronizing the engine's valves and pistons. Proper torque application is essential to prevent engine damage and ensure optimal performance.

1

Timing Belt/Chain Tensioner Bolt

M12 x 1.5
Torque Value
15 ft-lbs (20 N·m)
2

Camshaft Sprocket Bolt

M14 x 1.5
Torque Value
68 ft-lbs (92 N·m)

Accessories

The accessories are critical components of the engine, responsible for providing power to the engine's systems. Proper torque application is essential to prevent engine damage and ensure optimal performance.

1

Throttle Body Bolts

M8 x 1.25
Torque Value
12 ft-lbs (16 N·m)
2

Intake Manifold Bolts

M10 x 1.5
Torque Value
12 ft-lbs (16 N·m)

Exhaust System

The exhaust system is a critical component of the engine, responsible for directing exhaust gases away from the engine. Proper torque application is essential to prevent engine damage and ensure optimal performance.

1

Exhaust Manifold/Headers Bolts

M10 x 1.5
Torque Value
20 ft-lbs (27 N·m)

Fuel System

The fuel system is a critical component of the engine, responsible for providing fuel to the engine's cylinders. Proper torque application is essential to prevent engine damage and ensure optimal performance.

1

Fuel Rail Bolts

M8 x 1.25
Torque Value
12 ft-lbs (16 N·m)
2

Fuel Injector Bolts

M8 x 1.25
Torque Value
12 ft-lbs (16 N·m)

Cooling System

The cooling system is a critical component of the engine, responsible for regulating engine temperature. Proper torque application is essential to prevent engine damage and ensure optimal performance.

1

Water Pump Bolts

M10 x 1.5
Torque Value
12 ft-lbs (16 N·m)
2

Water Pump Pulley Bolts

M8 x 1.25
Torque Value
7 ft-lbs (9 N·m)

Ignition System

The ignition system is a critical component of the engine, responsible for providing the high voltage needed for spark plug ignition. Proper torque application is essential to prevent engine damage and ensure optimal performance.

1

Ignition Coil Bolt

M8 x 1.25
Torque Value
9 ft-lbs (12 N·m)

Turbocharger

The turbocharger is a critical component of the engine, responsible for providing boost pressure and increasing engine power. Proper torque application is essential to prevent engine damage and ensure optimal performance.

1

Turbocharger Mounting Bolts

M14 x 1.5
Torque Value
35 ft-lbs (47 N·m)
Important Notes
Estimated value, consult engine manufacturer's specifications for accurate information.

Intercooler

The intercooler is a critical component of the engine, responsible for cooling the compressed air from the turbocharger. Proper torque application is essential to prevent engine damage and ensure optimal performance.

1

Intercooler Mounting Bolts

M12 x 1.5
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Estimated value, consult engine manufacturer's specifications for accurate information.

Engine Mounts

The engine mounts are critical components of the engine, responsible for reducing engine vibrations and noise. Proper torque application is essential to prevent engine damage and ensure optimal performance.

1

Engine Mounting Bolts

M14 x 1.5
Torque Value
35 ft-lbs (47 N·m)
Important Notes
Estimated value, consult engine manufacturer's specifications for accurate information.

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 2.0L Turbo I4 engine?

The cylinder head bolts on the 2019-Present Infiniti QX50 2.0L Turbo I4 engine should be torqued in a specific sequence to 29 lb-ft (39 Nm) initially, then tightened an additional 90 degrees, and finally another 90 degrees. Always refer to the manufacturer's service manual for the exact sequence and specifications.

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 example, after replacing the turbocharger or cylinder head, recheck the torque after the first 500 miles (800 km) of driving to ensure bolts have not loosened due to thermal cycling.

Q3

Can I reuse bolts when reassembling the engine?

Some bolts, such as cylinder head bolts, are torque-to-yield (TTY) and must be replaced after removal. Reusing TTY bolts can lead to improper clamping force and potential engine damage. Always consult the service manual to determine which bolts are reusable.

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
Learn more

Engine Bolt Torque Chart

A reference chart specific to the 2.0L Turbo I4 engine bolt torque specifications.

  • Detailed torque values for all engine bolts
  • Organized by bolt type and location
Learn more
Service Procedures

Cylinder Head Bolt Torque Procedure

Step-by-step guide for torquing cylinder head bolts on the 2.0L Turbo I4 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 rotation.
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.
  • Lubricate the bolt threads with engine oil.
  • Tighten bolts in the specified sequence to the initial torque value.
  • Apply the final torque-to-yield rotation using a torque angle gauge.
View full procedure

Turbocharger Mounting Bolt Torque Procedure

Detailed steps for torquing turbocharger mounting bolts on the 2.0L Turbo I4 engine.

  • Inspect the turbocharger and mounting surfaces for damage or debris.
  • Install the turbocharger and hand-tighten the bolts.
  • Use a torque wrench to tighten the bolts to the specified torque value in the correct sequence.
View full procedure
Technical Service Bulletins

Cylinder Head Bolt Torque Specification Update

2021-03-15

Updated torque specifications for cylinder head bolts on the 2.0L Turbo I4 engine.

2019-2023 Infiniti QX50

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

Main Bearing Cap Bolt Inspection Notice

2022-07-10

Notice regarding potential under-torquing of main bearing cap bolts during assembly.

2019-2022 Infiniti QX50

Resolution: Inspect and re-torque main bearing cap bolts using the updated torque specifications.

Turbocharger Mounting Bolt Loosening Issue

2023-01-25

Reports of turbocharger mounting bolts loosening over time due to improper torque application.

2019-2023 Infiniti QX50

Resolution: Ensure proper torque application and use thread locker as specified in the service manual.

About the Author

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Alan Montanye - Automotive Technical Specialist
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Alan Montanye

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