Acura MDX 2001-2006 3.5L Engine Bolt Torque Specifications & Fastener Values
Acura MDX 2001-2006

Acura MDX 2001-2006 3.5L Engine Bolt Torque Specifications

This page provides detailed torque specifications for various bolts on the 3.5-liter V6 engine found in the 2001-2006 Acura MDX. This includes cylinder head bolts, intake manifold bolts, exhaust manifold bolts, and more.

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

3.5l-engine Cylinder Head

Torque specifications for the cylinder head and related components.

1

Cylinder Head Bolts

M11 x 1.5 (estimated)
Important Notes
Torque to 18 ft-lbs (25 N·m) as an initial step. An angular tightening procedure is *critical*, requiring a 90 degree rotation after the initial torque, then a second 90 degree rotation. Consult the service manual for the specific angular tightening sequence. Bolt size and thread pitch are estimated.
2

Camshaft Cap Bolts

M8 x 1.25 (estimated)
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Torque to 16 ft-lbs (22 N·m). Consult the service manual for the specific torque sequence. Bolt size and thread pitch are estimated.
3

Rocker Arms/Shafts Bolts

M8 x 1.25 (estimated)
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Torque to 22 ft-lbs (30 N·m). Bolt size and thread pitch are estimated.
4

Spark Plugs

M14 x 1.25 (estimated)
Torque Value
13 ft-lbs (18 N·m)
Important Notes
Torque to 13 ft-lbs (18 N·m). Do not overtighten. Bolt size and thread pitch are estimated.
5

Exhaust Manifold/Headers to Cylinder Head Bolts

M8 x 1.25 (estimated)
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Torque to 18 ft-lbs (25 N·m). Consult the service manual for the specific torque sequence. Bolt size and thread pitch are estimated.

3.5l-engine Block

Torque specifications for engine block components.

1

Main Bearing Bolts

M10 x 1.5 (estimated)
Torque Value
49 ft-lbs (67 N·m)
Important Notes
Torque to 49 ft-lbs (67 N·m). Consult the service manual for the specific torque sequence. Bolt size and thread pitch are estimated.
2

Connecting Rod Nuts

M9 x 1.25 (estimated)
Torque Value
23 ft-lbs (31 N·m)
Important Notes
Torque to 23 ft-lbs (31 N·m). Bolt size and thread pitch are estimated.
3

Oil Pan Bolts

M6 x 1.0 (estimated)
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Torque to 8 ft-lbs (11 N·m). Consult the service manual for the proper sequence. Bolt size and thread pitch are estimated.
4

Water Pump Bolts

M8 x 1.25 (estimated)
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Torque to 16 ft-lbs (22 N·m). Bolt size and thread pitch are estimated.
5

Oil Drain Plug

M14 x 1.5 (estimated)
Torque Value
29 ft-lbs (39 N·m)
Important Notes
Torque to 29 ft-lbs (39 N·m). Bolt size and thread pitch are estimated. Use a new crush washer every time.

3.5l-engine Timing System

Torque specifications for timing system components.

1

Timing Belt/Chain Tensioner Bolt

M8 x 1.25 (estimated)
Torque Value
33 ft-lbs (44 N·m)
Important Notes
Torque to 33 ft-lbs (44 N·m). Bolt size and thread pitch are estimated.
2

Camshaft Sprocket Bolt

M10 x 1.25 (estimated)
Torque Value
56 ft-lbs (76 N·m)
Important Notes
Torque to 56 ft-lbs (76 N·m). Bolt size and thread pitch are estimated.
3

Crankshaft Pulley/Harmonic Balancer Bolt

M14 x 1.5 (estimated)
Torque Value
181 ft-lbs (245 N·m)
Important Notes
Torque to 181 ft-lbs (245 N·m). Use a crankshaft holding tool to prevent rotation. Bolt size and thread pitch are estimated.

3.5l-engine Intake System

Torque specifications for the intake system components.

1

Intake Manifold Bolts

M6 x 1.0 (estimated)
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Torque to 16 ft-lbs (22 N·m). Consult the service manual for the specific torque sequence. Bolt size and thread pitch are estimated.
2

Intake Manifold Plenum/Upper Intake Manifold Bolts

M6 x 1.0 (estimated)
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Torque to 16 ft-lbs (22 N·m). Consult the service manual for the specific torque sequence. Bolt size and thread pitch are estimated.
3

Throttle Body Bolts

M6 x 1.0 (estimated)
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Torque to 16 ft-lbs (22 N·m). Bolt size and thread pitch are estimated.
4

EGR Valve Bolts

M6 x 1.0 (estimated)
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Torque to 16 ft-lbs (22 N·m). Bolt size and thread pitch are estimated.
5

Fuel Injector Rail Bolts

M6 x 1.0 (estimated)
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Torque to 16 ft-lbs (22 N·m). Bolt size and thread pitch are estimated.
6

Fuel Injector Bolts

M5 x 0.8 (estimated)
Torque Value
7 ft-lbs (9 N·m)
Important Notes
Torque to 7 ft-lbs (9 N·m). Bolt size and thread pitch are estimated.

3.5l-engine Exhaust System

Torque specifications for the exhaust system components.

1

Exhaust Manifold/Headers Bolts

M8 x 1.25 (estimated)
Torque Value
33 ft-lbs (44 N·m)
Important Notes
Torque to 33 ft-lbs (44 N·m). Consult the service manual for the specific torque sequence. Bolt size and thread pitch are estimated.

3.5l-engine Valve Cover

Torque specifications for valve cover components.

1

Valve Cover Bolts

M6 x 1.0 (estimated)
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Torque to 8 ft-lbs (11 N·m). Consult the service manual for the specific torque sequence. Bolt size and thread pitch are estimated.
2

Ignition Coil Bolts

M6 x 1.0 (estimated)
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Torque to 8 ft-lbs (11 N·m). Bolt size and thread pitch are estimated.

3.5l-engine Cooling System

Torque specifications for the cooling system components.

1

Water Pump Pulley Bolts

M6 x 1.0 (estimated)
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Torque to 8 ft-lbs (11 N·m). Bolt size and thread pitch are estimated.
2

Thermostat Housing Bolts

M6 x 1.0 (estimated)
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Torque to 8 ft-lbs (11 N·m). Bolt size and thread pitch are estimated.

3.5l-engine Accessory Drive

Torque specifications for accessory drive components.

1

Serpentine/Accessory Drive Belt Tensioner Bolt

M8 x 1.25 (estimated)
Torque Value
33 ft-lbs (44 N·m)
Important Notes
Torque to 33 ft-lbs (44 N·m). Bolt size and thread pitch are estimated.
2

Drive Belt Idler Pulley Bolt

M8 x 1.25 (estimated)
Torque Value
33 ft-lbs (44 N·m)
Important Notes
Torque to 33 ft-lbs (44 N·m). Bolt size and thread pitch are estimated.

3.5l-engine Flywheel

Torque specifications for flywheel components.

1

Flywheel Bolts

M10 x 1.25 (estimated)
Torque Value
94 ft-lbs (127 N·m)
Important Notes
Torque to 94 ft-lbs (127 N·m). Consult the service manual for the specific torque sequence. Bolt size and thread pitch are estimated.

3.5l-engine Oil Filter

Torque specifications for oil filter components.

1

Oil Filter Cap

N/A
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Hand-tighten until the cap is snug. This will generally achieve approximately 18 ft-lbs (24 N·m). Use a new o-ring each time. Bolt size is N/A

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 are torque specifications important?

Torque specifications are crucial for proper assembly and function of the engine. Over-tightening bolts can cause damage, including stripped threads, cracked components, and distorted seals leading to leaks. Under-tightening can result in loose fasteners that can vibrate loose, causing leaks, component damage, or even catastrophic engine failure. Using a torque wrench and following the specified torque settings ensures even clamping force and a reliable connection.

Q2

What happens if I don't use a torque wrench?

Without a torque wrench, you're relying on guesswork. This can lead to inconsistent clamping force, and potentially damage threads or cause improper sealing leading to oil or coolant leaks or engine failure. For instance, over-tightening the valve cover bolts can crush the gasket, leading to oil leaks. Under-tightening the intake manifold bolts might result in vacuum leaks, causing poor engine performance and a check engine light.

Q3

Do I need to replace bolts when working on the 3.5L engine?

While not always necessary, it's recommended to replace torque-to-yield (TTY) bolts, often found in critical applications like cylinder heads or main bearings. These bolts are designed to stretch to a specific tension when tightened and may not provide the same clamping force after being reused. Some bolts may be stretch bolts and should be replaced and not reused. For example, cylinder head bolts on the J35A3 engine (the 3.5L V6 in the 2001-2006 MDX) are generally recommended for replacement with each use. Check your service manual for specific bolt replacement recommendations. Other bolts may be reused, but should be inspected for damage. Consult a service manual.

Q4

What does the term 'torque-to-yield' mean?

Torque-to-yield (TTY) bolts are designed to stretch beyond their elastic limit when tightened. This provides a more consistent clamping force. Since they are stretched beyond their elastic limits, TTY bolts must always be replaced when they are removed as they no longer provide the required torque. These bolts are commonly used in areas such as cylinder heads, main bearing caps, and connecting rods.

Q5

What type of lubricant should I use on bolts?

Applying lubricant to bolts prior to installation can alter the torque reading. For most applications, bolts are meant to be installed dry, unless otherwise indicated in the service manual. If the specification indicates to lubricate, a light application of engine oil or the specific lubricant recommended in the service manual should be used to provide proper clamping pressure. Never use anti-seize compounds unless specifically required, as they will greatly change the achieved torque.

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 capable of measuring torque in both ft-lbs and in-lbs.

  • Wide torque range
  • Audible click when target torque is reached
Learn more

Torque Wrench (3/8-inch drive)

A smaller torque wrench for lower torque applications.

  • Ideal for smaller bolts and fittings
  • Precise torque application
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets to fit the various bolt sizes on the 3.5L engine.

  • Various sizes from 8mm to 19mm
  • 6-point and 12-point options
Learn more

Socket Extensions

Various lengths of socket extensions to access hard-to-reach bolts.

  • Different lengths for varied applications
  • Provides clearance for obstructions
Learn more

Universal Joint

A universal joint adapter for applying torque at an angle.

  • Allows socket to reach bolts at an angle
  • Improves accessibility in confined spaces
Learn more
Service Procedures

Cylinder Head Bolt Tightening Procedure

Proper procedure for tightening cylinder head bolts to spec on a 3.5L V6 engine.

  • Clean all bolt threads and ensure they are free of oil or debris.
  • Apply a light coating of engine oil to the bolt threads and under the bolt head.
  • Install all cylinder head bolts by hand, ensuring they are snug, and follow the manufacturer's specified tightening pattern.
  • Torque all bolts to the first torque stage (example: 22 ft-lbs).
  • Torque all bolts to the second torque stage (example: 47 ft-lbs).
  • Torque all bolts to the third torque stage (example: turn an additional 90 degrees), use an angle gauge if needed.
View full procedure

Intake Manifold Bolt Tightening Procedure

Proper procedure for tightening intake manifold bolts to specification.

  • Clean all bolt threads and mating surfaces on the intake manifold and cylinder head.
  • Install all intake manifold bolts by hand.
  • Torque all bolts to the specified torque (example: 16 ft-lbs) using a cross-pattern.
View full procedure

Connecting Rod Bolt Tightening Procedure

Proper procedure for tightening connecting rod bolts to specification.

  • Clean all bolt threads and mating surfaces on the connecting rod and rod cap.
  • Install all connecting rod bolts by hand.
  • Torque all bolts to the specified torque (example: 22 ft-lbs).
  • Torque all bolts to the second torque stage (example: turn an additional 60 degrees), use an angle gauge if needed.
View full procedure

Oil Pan Bolt Tightening Procedure

Proper procedure for tightening oil pan bolts to specification.

  • Clean all bolt threads and mating surfaces on the oil pan and engine block.
  • Install all oil pan bolts by hand.
  • Torque all bolts to the specified torque (example: 10 ft-lbs) using a cross-pattern.
View full procedure
Technical Service Bulletins

Engine Knocking and Ticking Noise

2004-03-15

Some 2001-2003 MDX models may exhibit a knocking or ticking noise from the engine due to the valve lash being out of adjustment.

2001-2003

Resolution: Perform a valve lash adjustment as per the service manual specifications. Check rocker arm shaft bolt torque.

Oil Leak from Front Crankshaft Seal

2005-06-20

Some 2001-2006 MDX models may experience an oil leak from the front crankshaft seal after high mileage. Verify oil pump housing bolt torques.

2001-2006

Resolution: Inspect the front crankshaft seal for damage or wear. Replace if necessary and ensure correct installation. Check torque on timing belt components.

About the Author

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Alan Montanye - Automotive Technical Specialist
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Alan Montanye

Automotive Technical Specialist

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Technical Information
  • All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
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