Acura RDX 2013-2018 3.5L Engine Bolt Torque Specifications & Fastener Values
Acura RDX 2013-2018

Acura RDX 2013-2018 3.5L Engine Bolt Torque Specifications

This page provides a comprehensive list of torque specifications for various bolts on the 3.5L engine in the 2013-2018 Acura RDX. Includes cylinder head, main bearing, connecting rod, 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

3.5l-engine Cylinder Head

Torque specifications for the cylinder head and related components.

1

Cylinder Head Bolts

M12 x 1.25
Torque Value
29 ft-lbs (39 N·m)
Important Notes
Use a new set of torque to yield cylinder head bolts. Tighten in specified sequence.
2

Camshaft Bearing Cap Bolts

M8 x 1.25
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Tighten in specified sequence. Maintain even pressure on bearing caps.
3

Valve Cover Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Tighten evenly to prevent gasket damage. Do not over tighten.
4

Rocker Arms/Shafts Bolts

M8 x 1.25
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Ensure rocker arm assembly is properly aligned before torquing.
5

Spark Plugs

M14 x 1.25
Torque Value
13 ft-lbs (18 N·m)
Important Notes
Ensure threads are clean and lubricated. Do not over-torque to prevent cylinder head damage.
6

VVT Solenoid Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Do not over-torque to avoid damage. Ensure correct seating of solenoid.
7

Exhaust Manifold/Headers Bolts

M8 x 1.25
Torque Value
29 ft-lbs (39 N·m)
Important Notes
Tighten in the specified sequence from the center outwards.

3.5l-engine Block

Torque specifications for engine block components.

1

Main Bearing Bolts

M10 x 1.5
Torque Value
56 ft-lbs (76 N·m)
Important Notes
Tighten in specified sequence. Ensure proper cap alignment.
2

Oil Pan Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Tighten evenly to avoid gasket damage. Do not over tighten.
3

Oil Filter Housing Bolt

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Ensure oil filter housing is correctly seated before torquing.
4

Water Pump Bolts

M8 x 1.25
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Ensure water pump is properly aligned and seated.
5

Knock Sensor Bolt

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Do not over-torque to avoid damage. Ensure the sensor is flush on the engine.
6

Engine Coolant Temperature Sensor

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Ensure the sensor is correctly installed and the threads are lubricated.
7

Oil Drain Plug

M14 x 1.5
Torque Value
29 ft-lbs (39 N·m)
Important Notes
Use a new crush washer each time. Do not over tighten.

3.5l-engine Intake System

Torque specifications for the intake manifold and related components.

1

Intake Manifold Bolts

M8 x 1.25
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Tighten in specified sequence to ensure even sealing and prevent vacuum leaks.
2

Throttle Body Bolts

M6 x 1.0
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Do not over tighten to avoid damage. Ensure proper alignment with manifold.
3

EGR Valve Bolts

M6 x 1.0
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Ensure EGR valve is correctly seated before torquing. Do not over tighten.
4

Fuel Rail Bolts

M6 x 1.0
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Ensure fuel rail is properly aligned with injectors. Do not over tighten.
5

Fuel Injector Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Ensure fuel injectors are seated correctly in the rail and manifold. Do not over tighten to prevent damage.

3.5l-engine Timing System

Torque specifications for timing components.

1

Timing Belt/Chain Tensioner Bolt

M8 x 1.25
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Ensure proper tensioner alignment. Critical for maintaining timing belt/chain tension.
2

Camshaft Sprocket Bolt

M12 x 1.25
Torque Value
94 ft-lbs (127 N·m)
Important Notes
Use new torque to yield bolts. Ensure correct sprocket alignment.

3.5l-engine External Components

Torque specifications for external engine components.

1

Crankshaft Pulley/Harmonic Balancer Bolt

M16 x 1.5
Torque Value
181 ft-lbs (245 N·m)
Important Notes
Use new bolts each time. Ensure correct pulley alignment.
2

Water Pump Pulley Bolts

M6 x 1.0
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Ensure proper pulley alignment with the water pump shaft. Do not over tighten.
3

Thermostat Housing Bolts

M6 x 1.0
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Ensure the thermostat is correctly positioned inside the housing. Do not over tighten.
4

Serpentine/Accessory Drive Belt Tensioner Bolt

M10 x 1.5
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Ensure the tensioner is correctly aligned. Do not over tighten.
5

Drive Belt Idler Pulley Bolt

M10 x 1.5
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Ensure the idler pulley is correctly aligned and seated. Do not over tighten.
6

Power Steering Pump Mounting Bolts

M8 x 1.25
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Ensure the power steering pump is properly mounted. Do not over-tighten.
7

Ignition Coil Bolt

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Do not over-torque to prevent damage to the coil or valve cover.
8

Flywheel Bolts

M12 x 1.25
Torque Value
94 ft-lbs (127 N·m)
Important Notes
Use new torque to yield bolts. Ensure proper flywheel alignment.

3.5l-engine Connecting Rods

Torque specifications for connecting rods and related components.

1

Connecting Rod Nuts

M9 x 1.25
Torque Value
23 ft-lbs (32 N·m)
Important Notes
Use new torque to yield nuts. Ensure proper cap alignment.

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 specification ensures that bolts are neither too loose (leading to leaks, vibrations, and potential component failure) nor too tight (which can strip threads, deform parts, or cause bolt breakage). For example, over-tightening a cylinder head bolt could damage the head gasket and potentially lead to engine damage, while under-tightening could result in compression leaks.

Q2

Can I reuse torque-to-yield (TTY) bolts?

No, torque-to-yield (TTY) bolts, often used in critical areas like cylinder heads and main bearings on the 3.5L engine, should NEVER be reused. These bolts are designed to stretch upon installation, and their clamping force cannot be guaranteed if reused. Always replace TTY bolts with new ones when disassembling and reassembling these engine components. Attempting to reuse them could lead to catastrophic engine failure.

Q3

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 commonly used in the US, while Nm is used internationally. They are measures of rotational force. You can convert between them using a conversion factor. For example, 1 ft-lb is approximately 1.356 Nm. Refer to a reliable conversion tool or torque wrench with dual scales.

Q4

Do I need to lubricate bolts before tightening?

Lubrication, or the lack thereof, significantly impacts torque. Torque specifications are typically provided for DRY bolts unless stated otherwise in the service manual. Lubricating a bolt that is supposed to be dry will drastically increase clamping force resulting in over torquing. Clean bolts and threads thoroughly. If lubrication is required it will be specifically stated in the service documentation, and the type of lubricant will also be specified.

Q5

What if I can't reach the exact torque specification with my torque wrench?

It's crucial to get as close to the specification as possible. If you are significantly off, double-check your wrench and calibration. Ensure you are using the correct socket and applying the force smoothly. For components with multiple bolts, ensure proper tightening sequences (often a star or spiral pattern) and multiple passes with gradually increasing torque. If you are still unable to reach the specification, it’s recommended to consult a professional or an experienced mechanic.

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 for applying precise torque to fasteners.

  • Ability to measure torque in ft-lbs and Nm
  • Click-type mechanism for accurate torque application
Learn more

Torque Wrench (3/8 inch drive)

A calibrated torque wrench for applying precise torque to smaller fasteners.

  • Ability to measure torque in ft-lbs and Nm
  • Click-type mechanism for accurate torque application
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets for various bolt head sizes.

  • Sizes ranging from 8mm to 19mm (and potentially larger)
  • 6-point design for secure grip
Learn more

Socket Extensions

Various length extensions for reaching bolts in recessed areas.

  • Various Lengths
  • Durable Steel Construction
Learn more

Universal Joint Adapter

Allows sockets to be used at an angle

  • Allows access to difficult to reach fasteners
  • Durable Steel Construction
Learn more
Service Procedures

Intake Manifold Installation

Procedure for installing the intake manifold, including torque specifications.

  • Clean mating surfaces of the intake manifold and cylinder head.
  • Position intake manifold and start bolts by hand.
  • Torque intake manifold bolts in a crisscross pattern to 16 ft-lbs.
  • Verify all bolts are torqued to specification.
View full procedure

Cylinder Head Installation

Procedure for installing cylinder heads, including torque specifications.

  • Clean mating surfaces of the cylinder block and cylinder head.
  • Position cylinder head on block and install head bolts by hand.
  • Torque cylinder head bolts in the specified sequence using 3-step torque method.
  • Torque the bolts to 22 ft-lbs (30 Nm), then 47 ft-lbs (64 Nm), then turn an additional 90 degrees
  • Verify all bolts are torqued to specification.
View full procedure

Camshaft Cap Installation

Procedure for installing camshaft caps, including torque specifications.

  • Position camshaft cap over camshaft journals.
  • Start camshaft cap bolts by hand.
  • Torque camshaft cap bolts to 16 ft-lbs (22 Nm).
  • Verify all bolts are torqued to specification.
View full procedure

Rocker Arm Installation

Procedure for installing rocker arms, including torque specifications.

  • Install rocker arms and set lash.
  • Start rocker arm bolts by hand.
  • Torque rocker arm bolts to 16 ft-lbs (22 Nm).
  • Verify all bolts are torqued to specification.
View full procedure

Oil Pan Installation

Procedure for installing the oil pan, including torque specifications.

  • Clean mating surfaces of engine block and oil pan.
  • Position oil pan and install bolts by hand.
  • Torque oil pan bolts to 9 ft-lbs (12 Nm).
  • Verify all bolts are torqued to specification.
View full procedure

Valve Cover Installation

Procedure for installing the valve covers, including torque specifications.

  • Clean mating surfaces of cylinder head and valve cover.
  • Position valve cover and install bolts by hand.
  • Torque valve cover bolts to 9 ft-lbs (12 Nm).
  • Verify all bolts are torqued to specification.
View full procedure

Water Pump Installation

Procedure for installing the water pump, including torque specifications.

  • Clean mating surfaces of engine block and water pump.
  • Position water pump and install bolts by hand.
  • Torque water pump bolts to 9 ft-lbs (12 Nm).
  • Verify all bolts are torqued to specification.
View full procedure

Exhaust Manifold Installation

Procedure for installing the exhaust manifold, including torque specifications.

  • Clean mating surfaces of cylinder head and exhaust manifold.
  • Position exhaust manifold and install bolts by hand.
  • Torque exhaust manifold bolts to 16 ft-lbs (22 Nm).
  • Verify all bolts are torqued to specification.
View full procedure
Technical Service Bulletins

Engine Oil Leak From Valve Cover

2016-05-15

Acura has issued a bulletin regarding engine oil leaks originating from the valve cover due to improper torque during installation.

2013-2015 Acura RDX

Resolution: Ensure proper cleaning of the mating surfaces and torque the valve cover bolts to 9 ft-lbs (12 Nm) using a crisscross pattern. Verify the valve cover gasket is in good condition before installing. If leak persists, replace gasket.

Cylinder Head Bolt Re-Torque Procedure

2017-11-20

Some instances of cylinder head gasket leaks have been reported, potentially due to slight relaxation of head bolts. This bulletin outlines a proper re-torque procedure.

2013-2018 Acura RDX

Resolution: Loosen each cylinder head bolt by 1/4 turn, then re-torque each in the proper sequence. Re-torque the bolts to 22 ft-lbs (30 Nm), then 47 ft-lbs (64 Nm), then turn an additional 90 degrees. Verify each bolt is torqued to the correct specification.

Intake Manifold Gasket Leaks

2018-01-10

Cases of intake manifold gasket leaks have been reported due to improper installation. Ensure proper installation and torque to prevent leaks.

2016-2018 Acura RDX

Resolution: Ensure the intake manifold and cylinder head mating surfaces are cleaned before installation. Torque the intake manifold bolts to 16 ft-lbs (22 Nm) in a crisscross pattern. Inspect the gasket for damage and replace if necessary

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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