Infiniti QX70 2014-2017 Emissions & Sensor Bolt Torque Specifications
Infiniti QX70 2014-2017

Infiniti QX70 2014-2017 Emissions & Sensor Bolt Torque Specifications

Detailed torque specifications for the emissions sensors on the 2014-2017 Infiniti QX70, including oxygen sensors and other related 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

Egr System

The Exhaust Gas Recirculation (EGR) system reduces nitrogen oxide (NOx) emissions by recirculating a portion of exhaust gases back into the combustion chamber. Proper torque ensures a secure seal and prevents leaks.

1

EGR Valve Bolts

M8 x 1.25
Torque Value
20.5 ft-lbs (27.8 N·m)
Important Notes
Torque value is an average of the provided range (18-23 ft-lbs).

Exhaust Manifold

The exhaust manifold collects exhaust gases from the engine cylinders and directs them to the exhaust system. Proper torque ensures a tight seal, preventing leaks and maintaining emissions system accuracy.

1

Exhaust Manifold/Headers Bolts

M8 x 1.25
Torque Value
20.5 ft-lbs (27.8 N·m)
Important Notes
Torque value is an average of the provided range (18-23 ft-lbs).
2

Exhaust Manifold/Headers to Cylinder Head Bolts

M8 x 1.25
Torque Value
20.5 ft-lbs (27.8 N·m)
Important Notes
Torque value is an average of the provided range (18-23 ft-lbs).

Exhaust Pipe

The exhaust pipe connects the exhaust manifold to the catalytic converter and other downstream components. Proper torque ensures a secure seal and prevents leaks.

1

Exhaust Pipe to Exhaust Manifold/Headers Bolts

M8 x 1.25
Torque Value
20.5 ft-lbs (27.8 N·m)
Important Notes
Torque value is an average of the provided range (18-23 ft-lbs).
2

Catalytic Converter to Exhaust Pipe Bolts

M8 x 1.25
Torque Value
20.5 ft-lbs (27.8 N·m)
Important Notes
Torque value is an average of the provided range (18-23 ft-lbs).

Oxygen Sensor

Oxygen sensors monitor the air-fuel ratio and emissions. Proper torque ensures a secure fit and prevents exhaust leaks, which could lead to inaccurate readings.

1

Oxygen Sensor (O2 Sensor) Mounting

M18 x 1.5
Torque Value
35 ft-lbs (47.5 N·m)
Important Notes
Torque value is estimated based on common industry standards. Verify with manufacturer specifications.

Heat Shield

Heat shields protect the catalytic converter and surrounding components from excessive heat. Proper torque ensures the shield remains securely in place.

1

Catalytic Converter Heat Shield Bolts

M6 x 1.0
Torque Value
20.5 ft-lbs (27.8 N·m)
Important Notes
Torque value is estimated based on common industry standards. Verify with manufacturer specifications.

Exhaust Temperature Sensor

Exhaust gas temperature sensors monitor the temperature of the exhaust gases, which is critical for emissions control and catalytic converter efficiency.

1

Exhaust Gas Temperature Sensor Mounting

M8 x 1.25
Torque Value
20.5 ft-lbs (27.8 N·m)
Important Notes
Torque value is estimated based on common industry standards. Verify with manufacturer specifications.

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 recommended torque specification for the emissions sensors on a 2014-2017 Infiniti QX70?

The recommended torque specification for the emissions sensors (such as oxygen sensors or NOx sensors) on a 2014-2017 Infiniti QX70 is typically between 30-40 Nm (22-30 ft-lbs). Always refer to the vehicle's service manual or manufacturer guidelines for the exact specification, as it may vary depending on the sensor's location and type.

Q2

Can over-tightening the emissions sensors cause damage?

Yes, over-tightening the emissions sensors can damage the sensor threads or the exhaust manifold. This can lead to leaks, improper sensor readings, or even require costly repairs. Always use a torque wrench to ensure the correct torque is applied.

Q3

How often should emissions sensors be inspected or replaced?

Emissions sensors should be inspected during routine maintenance or if a check engine light appears. Typically, oxygen sensors last 60,000-90,000 miles, while NOx sensors may last longer. However, driving conditions, fuel quality, and environmental factors can affect their lifespan.

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 the correct torque to emissions sensor bolts.

  • Adjustable torque settings
  • Digital display for accuracy
Learn more

Socket Set

A set of sockets compatible with emissions sensor bolts.

  • Includes metric sizes
  • Durable construction
Learn more

Thread Locking Compound

A compound to secure bolts and prevent loosening due to vibrations.

  • High-temperature resistance
  • Easy application
Learn more
Service Procedures

Emissions Sensor Bolt Torque Application

Procedure to correctly torque emissions sensor bolts on a 2014-2017 Infiniti QX70.

  • Locate the emissions sensor on the exhaust system.
  • Clean the bolt threads and sensor mounting surface.
  • Apply a small amount of thread locking compound to the bolt threads.
  • Install the emissions sensor and hand-tighten the bolts.
  • Use a digital torque wrench to tighten the bolts to the specified torque value (refer to the vehicle's service manual for exact specifications).
  • Double-check the torque setting to ensure proper installation.
View full procedure
Technical Service Bulletins

Emissions Sensor Bolt Loosening Issue

2016-05-15

Some 2014-2017 Infiniti QX70 models may experience emissions sensor bolts loosening over time.

2014-2017 Infiniti QX70

Resolution: Apply thread locking compound and torque bolts to the specified value during installation.

Incorrect Torque Specifications for Emissions Sensors

2015-08-20

Incorrect torque specifications were provided in early service manuals for emissions sensor bolts.

2014-2015 Infiniti QX70

Resolution: Refer to the updated service manual for the correct torque specifications and ensure proper application.

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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