Acura ZDX 2010-2013 3.7L Engine Bolt Torque Specifications & Fastener Values
Acura ZDX 2010-2013

Acura ZDX 2010-2013 3.7L Engine Bolt Torque Specifications

Comprehensive guide to bolt torque specifications for the 3.7L engine found in the 2010-2013 Acura ZDX. Includes torque values for various 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

3.7l-engine Cylinder Head

Torque specifications for the cylinder head and related components.

1

Cylinder Head Bolts

M12 x 1.25
Important Notes
Cylinder head bolts are torque to yield and require a two step angle torque after the initial torque. Always use new bolts. Follow the specific torque sequence specified by the service manual.
2

Valve Cover Bolts

M6 x 1.0
Torque Value
8.7 ft-lbs (11.8 N·m)
Important Notes
Tighten evenly to avoid valve cover damage. Follow the correct tightening sequence specified by the service manual.
3

Rocker Arms/Shafts Bolts

M8 x 1.25
Torque Value
14 ft-lbs (19 N·m)
Important Notes
Tighten evenly to avoid damage. Use the correct torque sequence specified by the service manual.
4

Camshaft Position Sensor Bolt

M6 x 1.0
Torque Value
8.7 ft-lbs (11.8 N·m)
Important Notes
Ensure the sensor is properly seated before tightening. Do not overtighten.
5

VTEC Solenoid Bolts

M6 x 1.0
Torque Value
8.7 ft-lbs (11.8 N·m)
Important Notes
Ensure proper seating of the gasket. Do not overtighten.
6

Ignition Coil Bolt

M6 x 1.0
Torque Value
8.7 ft-lbs (11.8 N·m)
Important Notes
Ensure coil is correctly positioned. Do not overtighten.
7

Exhaust Manifold/Headers to Cylinder Head Bolts

M8 x 1.25
Torque Value
17 ft-lbs (23 N·m)
Important Notes
Tighten evenly to avoid leaks. Follow the correct sequence from the service manual.
8

Spark Plugs

M14 x 1.25
Torque Value
13 ft-lbs (17.6 N·m)
Important Notes
Use a proper spark plug socket and ensure proper thread engagement before tightening. Do not overtighten.

3.7l-engine Block

Torque specifications for engine block components.

1

Main Bearing Bolts

M10 x 1.25
Important Notes
Main bearing bolts are torque to yield and require a two step angle torque after initial torque. Always use new bolts. Follow the specific torque sequence specified by the service manual.
2

Connecting Rod Nuts

M9 x 1.0
Important Notes
Connecting rod nuts are torque to yield and require an additional angle after the initial torque. Always use new nuts. Follow the specific sequence in the service manual.
3

Oil Pan Bolts

M6 x 1.0
Torque Value
8.7 ft-lbs (11.8 N·m)
Important Notes
Tighten evenly to avoid leaks. Follow correct sequence from the service manual.
4

Crankshaft Position Sensor Bolt

M6 x 1.0
Torque Value
8.7 ft-lbs (11.8 N·m)
Important Notes
Ensure the sensor is properly seated before tightening. Do not overtighten.
5

Oil Filter Housing Bolt

M6 x 1.0
Torque Value
8.7 ft-lbs (11.8 N·m)
Important Notes
Ensure the filter housing is flush with the engine block. Do not overtighten.
6

Oil Drain Plug

M14 x 1.5
Torque Value
29 ft-lbs (39 N·m)
Important Notes
Always use a new crush washer. Do not overtighten.
7

Water Pump Bolts

M6 x 1.0
Torque Value
8.7 ft-lbs (11.8 N·m)
Important Notes
Tighten evenly in a cross pattern to prevent leaks. Do not overtighten.

3.7l-engine Intake

Torque specifications for the intake manifold, throttle body and related components.

1

Intake Manifold Bolts

M8 x 1.25
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Tighten evenly using the sequence specified in the service manual.
2

Throttle Body Bolts

M6 x 1.0
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Tighten evenly to ensure proper seal. Do not overtighten.
3

EGR Valve Bolts

M6 x 1.0
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Ensure proper alignment of the EGR valve gasket. Do not overtighten.
4

Fuel Rail Bolts

M6 x 1.0
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Ensure proper seal for fuel safety. Do not overtighten.
5

Fuel Injector Bolts

M6 x 1.0
Torque Value
8.7 ft-lbs (11.8 N·m)
Important Notes
Ensure correct alignment of the fuel injector and sealing o-rings. Do not overtighten.

3.7l-engine Timing

Torque specifications for the timing belt/chain, crankshaft pulley, and related components.

1

Timing Belt/Chain Tensioner Bolt

M10 x 1.25
Torque Value
33 ft-lbs (44 N·m)
Important Notes
Ensure proper tensioner alignment. Do not overtighten.
2

Camshaft Sprocket Bolt

M10 x 1.25
Torque Value
22 ft-lbs (29.8 N·m)
Important Notes
Ensure correct alignment of the sprocket to the camshaft. Do not overtighten.
3

Crankshaft Pulley/Harmonic Balancer Bolt

M14 x 1.5
Torque Value
181 ft-lbs (245 N·m)
Important Notes
Hold the crankshaft when tightening. Do not overtighten.

3.7l-engine Cooling

Torque specifications for the water pump and related components.

1

Water Pump Pulley Bolts

M6 x 1.0
Torque Value
8.7 ft-lbs (11.8 N·m)
Important Notes
Ensure the pulley is properly seated. Do not overtighten.
2

Thermostat Housing Bolts

M6 x 1.0
Torque Value
8.7 ft-lbs (11.8 N·m)
Important Notes
Ensure correct placement of the thermostat and gasket to prevent leaks. Do not overtighten.

3.7l-engine Accessory Drive

Torque specifications for the accessory drive components.

1

Serpentine/Accessory Drive Belt Tensioner Bolt

M10 x 1.25
Torque Value
33 ft-lbs (44 N·m)
Important Notes
Ensure proper tensioner alignment. Do not overtighten.
2

Drive Belt Idler Pulley Bolt

M10 x 1.25
Torque Value
33 ft-lbs (44 N·m)
Important Notes
Ensure proper pulley alignment. Do not overtighten.

3.7l-engine Flywheel

Torque specifications for the flywheel.

1

Flywheel Bolts

M10 x 1.25
Torque Value
76 ft-lbs (103 N·m)
Important Notes
Ensure the flywheel is properly seated on the crankshaft. Use a flywheel holding tool. Do not overtighten.

3.7l-engine Sensors

Torque specifications for engine sensors.

1

Knock Sensor Bolt

M8 x 1.25
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Ensure the sensor is properly seated before tightening. Do not overtighten.

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

Why is using the correct torque specification so important?

Using the correct torque ensures that fasteners are tightened enough to hold components securely but not so tight that they will cause damage, such as stripping threads, warping components, or causing bolt failure. Over-tightening can also lead to premature gasket failure and leaks. For example, overtightening the intake manifold bolts could warp the manifold and create vacuum leaks.

Q2

What type of torque wrench should I use?

A calibrated torque wrench is essential for accurate tightening. It's recommended to use a click-type torque wrench for most applications. Digital torque wrenches can also be used but are often more expensive. Beam-type torque wrenches are less accurate and more difficult to use. Always ensure your torque wrench is within its calibration period for accurate readings. Consider a 3/8" drive torque wrench for most engine work on the 3.7L, and a 1/2" drive for larger bolts like the crankshaft pulley.

Q3

Do I need to use new bolts when working on the engine?

In many cases, yes. Torque-to-yield (TTY) bolts, often used for cylinder heads and connecting rods, should ALWAYS be replaced. These bolts stretch slightly upon tightening and are not designed for reuse. Reusing them can lead to improper clamping force and engine damage. Even for non-TTY bolts, new bolts can ensure a stronger and more reliable fastening. Always consult the Acura service manual for specifics on each bolt.

Q4

What is the difference between 'ft-lb' and 'N-m'?

'ft-lb' refers to foot-pounds, a unit of torque commonly used in North America. 'N-m' refers to Newton-meters, the SI unit for torque used internationally. 1 ft-lb is approximately equal to 1.356 N-m. When referencing torque specifications, ensure the unit is correct for your torque wrench.

Q5

What should I do if a bolt breaks during tightening?

If a bolt breaks, immediately stop. Attempting to tighten further can cause further damage. Use a bolt extractor to remove the broken bolt and replace it with a new one. Inspect the threads in the hole for damage, and repair them if needed using a thread repair kit. If the bolt breaks, it may indicate either an incorrect torque value or a defective bolt.

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

Torque Wrench (1/2 inch drive)

A calibrated torque wrench is essential for accurately tightening bolts to specified torque values, preventing damage and ensuring proper sealing. This size is versatile enough for many engine applications.

  • 1/2 inch drive size for common bolt sizes
  • Accurate and calibrated torque measurements
  • Wide torque range for various applications
Learn more

Torque Wrench (3/8 inch drive)

A smaller 3/8 inch drive torque wrench is helpful for smaller or more delicate bolts found in the engine compartment. This offers better precision in tight spaces.

  • 3/8 inch drive size for smaller bolts
  • Accurate and calibrated torque measurements
  • Lower torque range than 1/2 inch drives
Learn more

Socket Set (Metric)

A comprehensive metric socket set is necessary to fit the different bolt head sizes encountered on the 3.7L engine.

  • Includes various sizes for a range of bolts
  • Both standard and deep well sockets are useful
  • Typically made of strong chrome vanadium steel
Learn more

Extension Bars

Extension bars of various lengths allow access to hard-to-reach bolts without compromising torque accuracy.

  • Available in various lengths to extend reach
  • Can be used with any compatible socket size
  • Helps avoid obstructions
Learn more

Universal Joint

A universal joint allows the socket and extension to be applied at an angle, enabling access to bolts that are not in a straight line.

  • Provides a pivot point for hard to access bolts
  • Allows for applying torque at an angle
  • Compatible with sockets and extension bars
Learn more
Service Procedures

Cylinder Head Bolt Torque Procedure (3.7L)

This procedure outlines the correct method for tightening the cylinder head bolts on the 3.7L V6 engine to ensure proper sealing and prevent engine damage.

  • Clean all bolts and threads thoroughly. Inspect for damage or wear and replace as needed.
  • Apply a thin layer of engine oil to the bolt threads and under the bolt heads.
  • Install all cylinder head bolts finger-tight in the correct sequence.
  • Torque all bolts to 36 ft-lbs (49 Nm) in the specified sequence.
  • Torque all bolts to 72 ft-lbs (98 Nm) in the same sequence.
  • Turn each bolt an additional 90 degrees in the same sequence.
  • Turn each bolt an additional 90 degrees in the same sequence.
  • Check torque after 10 minutes.
View full procedure

Intake Manifold Bolt Torque Procedure (3.7L)

This procedure outlines how to tighten intake manifold bolts to the correct torque to avoid leaks and ensure a proper seal.

  • Install new intake manifold gaskets.
  • Place intake manifold and start all bolts by hand
  • Torque bolts to 16 ft-lbs (22 Nm) in a crisscross pattern to ensure proper sealing.
  • Check torque after 10 minutes.
View full procedure

Exhaust Manifold Bolt Torque Procedure (3.7L)

This procedure outlines the correct procedure to tighten exhaust manifold bolts to prevent leaks.

  • Install new exhaust manifold gaskets.
  • Start all bolts by hand and finger tighten.
  • Torque bolts to 25 ft-lbs (34 Nm) in the specified sequence from center outwards.
  • Check torque after 10 minutes.
View full procedure

Rocker Arm Assembly Bolt Torque Procedure (3.7L)

This procedure outlines how to properly torque the rocker arm assembly bolts to ensure proper valve actuation.

  • Start bolts by hand and finger tighten.
  • Torque bolts to 18 ft-lbs (25 Nm) in the specified sequence from center outwards.
  • Check torque after 10 minutes.
View full procedure

Connecting Rod Cap Bolt Torque Procedure (3.7L)

This procedure details the proper method for securing connecting rod caps, which requires a torque-plus-angle approach for proper clamping force.

  • Install connecting rod caps, make sure bearings are installed properly.
  • Apply engine oil to threads and under the bolt heads.
  • Torque bolts to 22 ft-lbs (30 Nm) in the specified sequence.
  • Turn each bolt an additional 75 degrees in the same sequence.
  • Check torque after 10 minutes.
View full procedure
Technical Service Bulletins

Engine Misfire Due to Cylinder Head Bolt Stretch

2015-03-15

Some 2010-2013 Acura ZDX vehicles with the 3.7L engine may experience misfires and/or coolant leaks due to cylinder head bolt stretch. This is caused by improper initial torque settings used in earlier production runs.

2010-2013 Acura ZDX (3.7L engine)

Resolution: Replace cylinder head bolts with updated part number, and use the updated torque procedure. Refer to the current service manual specifications for torque values and sequence.

Intake Manifold Leakage and Vacuum Issues

2014-08-22

Reports of vacuum leaks and rough idle on 2010-2013 Acura ZDX 3.7L engines have been linked to improper intake manifold gasket sealing. Ensure proper torque procedure is followed and all surfaces are cleaned thoroughly before reassembly.

2010-2013 Acura ZDX (3.7L engine)

Resolution: Inspect intake manifold gasket for damage, replace if needed. Use the recommended torque procedure with a calibrated torque wrench and new gasket material if needed. Ensure all surfaces are clean before installation.

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.

Facebook Contact
15+ Years
Experience
500+ Guides
Guides
50+ Makes
Vehicles
1000+ Solutions
Solutions

Diagnostic

Specialized in advanced diagnostic techniques using modern scan tools and oscilloscopes.

Repair

Expert in both traditional mechanical repairs and modern vehicle systems.

Additional Expertise

Documentation

Created over 500 detailed repair guides and technical documents.

Training

Conducted technical training sessions and contributed to repair databases.

Certifications & Research

Certifications

  • ASE Master Technician Certification
  • Advanced Diagnostic Specialist
  • Hybrid/Electric Vehicle Systems
  • Performance Tuning Expert

Research & Community

Actively researches emerging technologies and contributes to automotive forums.

Legal Disclaimer

Important information about using this content

Always refer to your vehicle's service manual and take appropriate safety precautions when performing any maintenance or repairs.

General Information
The information provided on this website is for general informational purposes only. While we strive to maintain accuracy in our content, all specifications, procedures, and technical information should be verified against your vehicle's official service manual or with the manufacturer directly.
Warranty & Liability

The content on this website is provided "as is" without any representations or warranties, express or implied. We make no representations or warranties regarding the accuracy, completeness, or availability of the information.

We shall not be liable for any direct, indirect, special, or consequential damages arising from the use of information on this website.

Technical Information
  • All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
  • Vehicle specifications and procedures may vary by model year, trim level, and region.
  • Always follow the manufacturer's recommended procedures and safety precautions.
  • Working on vehicles can be dangerous. Always take proper safety precautions and use appropriate safety equipment.
  • If you're unsure about any procedure, consult a qualified professional mechanic.
Intellectual Property
All content, including text, images, and specifications, is protected by copyright and other intellectual property laws. Any unauthorized use or reproduction is prohibited.

© 2025 Acura Specs. All rights reserved.

Privacy Policy Terms of Service