Acura MDX 2014-2020 3.5L Engine Bolt Torque Specifications & Fastener Values
Acura MDX 2014-2020

Acura MDX 2014-2020 3.5L Engine Bolt Torque Specifications

Comprehensive guide to the bolt torque specifications for the 3.5L engine found in the 2014-2020 Acura MDX. 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

3.5l-engine Cylinder Head

Torque specifications for the cylinder head and related components.

1

Cylinder Head Bolts

M11 x 1.5 (estimated)
Important Notes
Follow the complete cylinder head bolt torque sequence specified in the service manual. Multiple tightening stages are typically required. Estimated bolt size, check against factory service manual
2

Camshaft Bearing Cap Bolts/Nuts

M8 x 1.25 (estimated)
Torque Value
13 ft-lbs (17.6 N·m)
Important Notes
Torque value is an estimate. Refer to the factory service manual for the specific torque for each bolt location. Multiple tightening stages may be required.
3

Rocker Arms/Shafts Bolts

M8 x 1.25 (estimated)
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Ensure proper rocker arm shaft alignment during installation. Estimated bolt size, check against factory service manual.
4

Spark Plugs

M14 x 1.25 (estimated)
Torque Value
13 ft-lbs (18 N·m)
Important Notes
Ensure spark plug threads are clean and apply anti-seize to the threads. Estimated bolt size, check against factory service manual.
5

Valve Cover Bolts

M6 x 1.0 (estimated)
Torque Value
8.7 ft-lbs (12 N·m)
Important Notes
Tighten the valve cover bolts evenly to prevent leaks. Estimated bolt size, check against factory service manual.
6

Variable Valve Timing (VVT) Solenoid/Actuator Bolts

M6 x 1.0 (estimated)
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Torque value is an estimate. Refer to the factory service manual for specific torque. Estimated bolt size, check against factory service manual.
7

Exhaust Manifold/Headers to Cylinder Head Bolts

M8 x 1.25 (estimated)
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Tighten the exhaust manifold/header bolts evenly to prevent exhaust leaks. Estimated bolt size, check against factory service manual.

3.5l-engine Block

Torque specifications for engine block components.

1

Main Bearing Bolts

M10 x 1.5 (estimated)
Important Notes
Follow the specified tightening sequence for main bearing bolts. Multiple tightening stages may be required. Estimated bolt size, check against factory service manual.
2

Connecting Rod Nuts

M9 x 1.25 (estimated)
Torque Value
23 ft-lbs (31 N·m)
Important Notes
Tighten connecting rod nuts evenly. Check for proper connecting rod bearing clearances before installing. Estimated bolt size, check against factory service manual.
3

Oil Pan Bolts

M6 x 1.0 (estimated)
Torque Value
8.7 ft-lbs (12 N·m)
Important Notes
Tighten oil pan bolts evenly to prevent leaks. Use new gasket or sealant. Estimated bolt size, check against factory service manual.
4

Oil Drain Plug Bolt

M14 x 1.5 (estimated)
Torque Value
29 ft-lbs (39 N·m)
Important Notes
Use a new crush washer with the oil drain plug to prevent leaks. Estimated bolt size, check against factory service manual.
5

Water Pump Bolts

M8 x 1.25 (estimated)
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Tighten water pump bolts evenly to prevent coolant leaks. Use new gasket or sealant. Estimated bolt size, check against factory service manual.
6

Starter Motor Mounting Bolts

M10 x 1.5 (estimated)
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Tighten the starter motor mounting bolts securely. Estimated bolt size, check against factory service manual.
7

Alternator Mounting Bolts

M10 x 1.5 (estimated)
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Tighten the alternator mounting bolts securely. Estimated bolt size, check against factory service manual.
8

A/C Compressor Mounting Bolts

M10 x 1.5 (estimated)
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Tighten the A/C compressor mounting bolts securely. Estimated bolt size, check against factory service manual.
9

Power Steering Pump Mounting Bolts

M10 x 1.5 (estimated)
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Tighten the power steering pump mounting bolts securely. Estimated bolt size, check against factory service manual.

3.5l-engine Intake

Torque specifications for intake system components.

1

Intake Manifold Bolts

M8 x 1.25 (estimated)
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Tighten the intake manifold bolts evenly to prevent vacuum leaks. Estimated bolt size, check against factory service manual.
2

Throttle Body Bolts

M6 x 1.0 (estimated)
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Tighten the throttle body bolts evenly to prevent vacuum leaks. Estimated bolt size, check against factory service manual.
3

EGR Valve Bolts

M6 x 1.0 (estimated)
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Ensure proper EGR valve sealing. Estimated bolt size, check against factory service manual.
4

Fuel Rail Bolts

M6 x 1.0 (estimated)
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Ensure proper fuel rail sealing to prevent leaks. Estimated bolt size, check against factory service manual.
5

Fuel Injector Bolts

M6 x 1.0 (estimated)
Torque Value
8.7 ft-lbs (12 N·m)
Important Notes
Ensure proper fuel injector sealing to prevent leaks. Estimated bolt size, check against factory service manual.
6

Fuel Injector Rail Bolts

M6 x 1.0 (estimated)
Torque Value
8.7 ft-lbs (12 N·m)
Important Notes
Ensure proper fuel rail sealing to prevent leaks. Estimated bolt size, check against factory service manual.

3.5l-engine Timing

Torque specifications for timing system components.

1

Timing Belt/Chain Tensioner Bolt

M8 x 1.25 (estimated)
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Proper tension is critical for the timing system. Estimated bolt size, check against factory service manual.
2

Camshaft Sprocket Bolt

M10 x 1.5 (estimated)
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Ensure proper alignment of the camshaft sprocket during installation. Estimated bolt size, check against factory service manual.
3

Crankshaft Pulley/Harmonic Balancer Bolt

M16 x 1.5 (estimated)
Torque Value
181 ft-lbs (245 N·m)
Important Notes
This is a high-torque bolt; ensure the threads are clean and use a calibrated torque wrench. Estimated bolt size, check against factory service manual.

3.5l-engine Cooling And Accessories

Torque specifications for cooling and accessory drive components.

1

Water Pump Pulley Bolts

M6 x 1.0 (estimated)
Torque Value
8.7 ft-lbs (12 N·m)
Important Notes
Ensure proper pulley alignment. Estimated bolt size, check against factory service manual.
2

Thermostat Housing Bolts

M6 x 1.0 (estimated)
Torque Value
8.7 ft-lbs (12 N·m)
Important Notes
Ensure proper sealing of the thermostat housing. Use new gasket. Estimated bolt size, check against factory service manual.
3

Serpentine/Accessory Drive Belt Tensioner Bolt

M10 x 1.5 (estimated)
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Ensure proper belt tensioner alignment. Estimated bolt size, check against factory service manual.
4

Drive Belt Idler Pulley Bolt

M10 x 1.5 (estimated)
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Ensure proper idler pulley alignment. Estimated bolt size, check against factory service manual.

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 it important to use the correct torque specifications?

Using the correct torque specifications ensures that bolts are tightened enough to hold components securely but not so much that they cause damage. Over-tightening can stretch or break bolts, strip threads, and cause gasket leaks. Under-tightening can lead to components coming loose, causing vibrations, leaks, or even complete failure. For example, over-torquing a cylinder head bolt could distort the cylinder head or cause head gasket failure, while under-torquing could lead to compression loss.

Q2

What is the difference between ft-lbs and Nm?

Ft-lbs (foot-pounds) and Nm (Newton-meters) are both units of torque. Ft-lbs is the unit commonly used in the United States, while Nm is the international standard unit. 1 ft-lb is approximately equal to 1.356 Nm. When working with a torque wrench, ensure the units match the specifications. If a specification is in Nm, and your wrench is in ft-lbs, you must convert the value before tightening. Failing to convert could result in incorrect torque application and potential damage.

Q3

Should I use new bolts each time I disassemble engine components?

For certain components, especially those that experience significant stress like cylinder head bolts and connecting rod bolts, new bolts are highly recommended. These are often torque-to-yield (TTY) bolts, which stretch slightly when tightened and cannot be reused safely. Using old bolts may not reach the correct torque and clamping force, increasing the risk of leaks or component failure. Other bolts, like those securing the intake manifold or valve covers, are often reusable, but always inspect them for damage or wear before reinstalling. Consult the repair manual for specific guidance on bolt reuse for each component.

Q4

Do I need to use thread locker on engine bolts?

Thread locker, such as Loctite, is generally not required for most engine bolts specified by the manufacturer. However, in certain applications where vibration could loosen bolts, or for components that are particularly difficult to access, the use of thread locker may be recommended. When the repair manual calls for threadlocker, it's crucial to use the specified type. Additionally, certain fasteners, such as those holding the oil pan, may require the use of anaerobic sealant instead of threadlocker. Always consult the repair manual to see if a sealant or thread locker is specified.

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" Drive)

A calibrated torque wrench is essential for accurately tightening bolts to specification. A 1/2" drive is recommended for most engine applications.

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

Torque Wrench (3/8" Drive)

A 3/8" drive torque wrench is useful for smaller bolts and applications with less torque required.

  • Lower torque range
  • Audible click when torque is reached
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets is required to fit the various bolt heads used on the engine.

  • Standard depth and deep sockets
  • Various drive sizes (1/2" and 3/8")
Learn more

Socket Extensions

Extensions are needed to reach bolts in recessed or hard-to-access areas of the engine.

  • Various lengths
  • Multiple drive sizes (1/2" and 3/8")
Learn more

Universal Joint

A universal joint allows sockets to be used at an angle when required to reach difficult bolts.

  • Flexible swivel head
  • Multiple drive sizes (1/2" and 3/8")
Learn more
Service Procedures

Cylinder Head Bolt Tightening Procedure (3.5L)

This procedure outlines how to properly tighten the cylinder head bolts on the 3.5L engine. It is critical for proper sealing and engine operation. Always refer to the manufacturer's specific torque sequence diagram.

  • Apply a thin layer of engine oil to the threads of each bolt.
  • Tighten all cylinder head bolts in the correct sequence to the first torque specification.
  • Using an angle torque meter, tighten all bolts further by the specified angle (typically 90-180 degrees, refer to manual).
  • Verify all bolts are tightened to the final torque specification. Double-check your work after the final torque.
View full procedure

Intake Manifold Bolt Tightening Procedure (3.5L)

This procedure outlines how to properly tighten the intake manifold bolts on the 3.5L engine. It's crucial to ensure proper sealing. Always refer to the manufacturer's specific torque sequence diagram.

  • Lightly thread all intake manifold bolts by hand.
  • Tighten all intake manifold bolts to the first torque specification in the correct sequence.
  • Tighten all bolts to the final torque specification in the correct sequence.
  • Double-check all bolts for proper torque.
View full procedure

Oil Pan Bolt Tightening Procedure (3.5L)

This procedure outlines how to properly tighten the oil pan bolts on the 3.5L engine. It's essential to ensure a leak-free seal.

  • Lightly thread all oil pan bolts by hand.
  • Tighten all oil pan bolts to the first torque specification in the correct sequence.
  • Tighten all bolts to the final torque specification in the correct sequence.
  • Double-check all bolts for proper torque.
View full procedure

Valve Cover Bolt Tightening Procedure (3.5L)

This procedure outlines how to properly tighten the valve cover bolts on the 3.5L engine. It's crucial to prevent oil leaks.

  • Lightly thread all valve cover bolts by hand.
  • Tighten all valve cover bolts to the specified torque in the correct sequence.
  • Do not overtighten, as this can damage the valve cover and cause leaks.
  • Double-check all bolts for proper torque.
View full procedure
Technical Service Bulletins

Engine Oil Leak from Oil Pan (3.5L)

2016-07-15

Some 2014-2016 MDX models with the 3.5L engine may experience an oil leak from the oil pan gasket due to improper torque application or gasket failure.

2014-2016

Resolution: Replace oil pan gasket and ensure proper torque is applied to oil pan bolts using the specified tightening sequence.

Cylinder Head Bolt Retorque Procedure (3.5L)

2018-02-28

Certain 2017-2018 models require a specific retorque procedure for the cylinder head bolts after initial assembly to prevent head gasket issues.

2017-2018

Resolution: Follow the updated cylinder head bolt torque and angle specification. After engine has reached operating temperature, allow it to cool and retorque using the specified steps.

Intake Manifold Vacuum Leak (3.5L)

2020-01-10

Some 2019-2020 models may exhibit a vacuum leak due to improper intake manifold bolt torque. This is usually caused by an improper tightening sequence.

2019-2020

Resolution: Inspect intake manifold gasket for damage. Ensure all intake manifold bolts are torqued to specification using the correct tightening sequence.

About the Author

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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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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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