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

Acura RLX 2014-2020 3.5L Engine Bolt Torque Specifications

Detailed torque specifications for all major bolts on the 3.5L V6 engine used in the 2014-2020 Acura RLX, including cylinder head, main bearing, and connecting rod bolts.

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

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3.5l-engine Cylinder Head

Torque specifications for the cylinder head and related components.

1

Cylinder Head Bolts

M11 x 1.5
Important Notes
Initial torque, followed by a 90 degree angle torque. Use a proper cylinder head torque sequence pattern.
2

Rocker Arms/Shafts Bolts

M8 x 1.25
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Ensure proper alignment of rocker arm components before tightening.
3

Camshaft Cap Bolts/Nuts

M8 x 1.25
Torque Value
12 ft-lbs (16 N·m)
Important Notes
Estimated value. Use a proper torque sequence.
4

Spark Plugs

M14 x 1.25
Torque Value
13 ft-lbs (18 N·m)
Important Notes
Do not overtighten. Use a proper spark plug socket.
5

Exhaust Manifold/Headers to Cylinder Head Bolts

M10 x 1.5
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Use a criss-cross tightening pattern to ensure even pressure on the manifold gasket.

3.5l-engine Block

Torque specifications for engine block components.

1

Main Bearing Bolts

M10 x 1.5
Important Notes
Initial torque, followed by a 60 degree angle torque. Always use a proper main bearing torque sequence.
2

Connecting Rod Nuts

M9 x 1.25
Important Notes
Initial torque, followed by a 60 degree angle torque. Use a proper connecting rod torque sequence.
3

Oil Pan Bolts

M6 x 1.0
Torque Value
8.7 ft-lbs (11.8 N·m)
Important Notes
Use a proper torque sequence to ensure an even seal.
4

Water Pump Bolts

M8 x 1.25
Torque Value
8.7 ft-lbs (11.8 N·m)
Important Notes
Do not overtighten. Use a criss-cross pattern.
5

Oil Drain Plug Bolt

M14 x 1.5
Torque Value
29 ft-lbs (39 N·m)
Important Notes
Use a new crush washer.
6

Starter Motor Mounting Bolts

M10 x 1.5
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Ensure proper alignment before tightening.
7

Alternator Mounting Bolts

M10 x 1.5
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Ensure proper alignment before tightening.

3.5l-engine Intake

Torque specifications for intake manifold and related components.

1

Intake Manifold Bolts

M8 x 1.25
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Use a proper torque sequence to ensure an even seal.
2

Throttle Body Bolts

M6 x 1.0
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Do not overtighten. Use a criss-cross pattern.
3

EGR Valve Bolts

M8 x 1.25
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Ensure proper alignment before tightening.
4

Fuel Rail Bolts

M6 x 1.0
Torque Value
8.7 ft-lbs (11.8 N·m)
Important Notes
Do not overtighten. Use a criss-cross pattern.
5

Fuel Injector Bolts

M6 x 1.0
Torque Value
8.7 ft-lbs (11.8 N·m)
Important Notes
Ensure proper alignment before tightening.
6

Knock Sensor Bolt

M8 x 1.25
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Estimated value. Do not overtighten.

3.5l-engine Cooling

Torque specifications for cooling system components.

1

Thermostat Housing Bolts

M6 x 1.0
Torque Value
8.7 ft-lbs (11.8 N·m)
Important Notes
Use a new gasket. Do not overtighten.
2

Engine Coolant Temperature (ECT) Sensor

M12 x 1.5
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Estimated value. Use a new crush washer if applicable.
3

Water Pump Pulley Bolts

M6 x 1.0
Torque Value
8.7 ft-lbs (11.8 N·m)
Important Notes
Ensure proper alignment before tightening. Use a criss-cross tightening pattern.

3.5l-engine Accessory

Torque specifications for components of the engine's accessory drive system.

1

Serpentine/Accessory Drive Belt Tensioner Bolt

M10 x 1.5
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Ensure proper alignment before tightening.
2

Drive Belt Idler Pulley Bolt

M10 x 1.5
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Ensure proper alignment before tightening.
3

A/C Compressor Mounting Bolts

M10 x 1.5
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Ensure proper alignment before tightening.

3.5l-engine Timing

Torque specifications for components related to engine timing.

1

Timing Belt/Chain Tensioner Bolt

M10 x 1.5
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Ensure proper tensioner operation after installation.
2

Camshaft Sprocket Bolt

M12 x 1.25
Torque Value
94 ft-lbs (127 N·m)
Important Notes
Ensure proper alignment of timing marks before tightening.

3.5l-engine Flywheel

Torque specifications for the flywheel and related components.

1

Flywheel Bolts

M12 x 1.25
Torque Value
76 ft-lbs (103 N·m)
Important Notes
Use new bolts. Use a criss-cross pattern.

3.5l-engine Crankshaft

Torque specifications for the crankshaft and related components.

1

Crankshaft Pulley/Harmonic Balancer Bolt

M14 x 1.5
Torque Value
181 ft-lbs (245 N·m)
Important Notes
Ensure proper alignment before tightening.

3.5l-engine Other

Torque specifications for miscellaneous engine components.

1

Valve Cover Bolts

M6 x 1.0
Torque Value
8.7 ft-lbs (11.8 N·m)
Important Notes
Use a new gasket or sealer if required. Do not overtighten.
2

Ignition Coil Bolt

M6 x 1.0
Torque Value
8.7 ft-lbs (11.8 N·m)
Important Notes
Ensure proper alignment before tightening.
3

Oil Filter Cap

N/A
Torque Value
0 ft-lbs (0 N·m)
Important Notes
Hand tight only, do not overtighten.
4

Oil Filter Housing Bolt

N/A
Torque Value
0 ft-lbs (0 N·m)
Important Notes
Hand tight only, 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 important?

Using the correct torque specification is crucial to ensure proper clamping force, preventing leaks, and avoiding damage to components. Over-tightening can strip threads or crack housings, while under-tightening can lead to loose connections and fluid leaks. For example, overtightening the cylinder head bolts could warp the head, leading to engine damage, while undertightening them could cause a head gasket leak.

Q2

What tools are recommended for tightening bolts to the specified torque?

A calibrated torque wrench is essential for accurate tightening. Both click-type and beam-type torque wrenches are acceptable, but digital torque wrenches offer increased accuracy. It's important to use the correct size socket or wrench head to prevent slippage and damage to the bolt head. Always double check the torque spec using a reliable source and the calibration status of your wrench.

Q3

What should I do if a bolt feels stripped or has cross-threaded?

If a bolt feels stripped or cross-threaded, stop immediately. Trying to force it will only worsen the problem. You may need to use a thread repair kit or a helicoil to restore the threads before re-installing a bolt. For example, if you feel the oil pan drain plug cross-threading, remove it immediately and use a thread chaser to clean the threads. Otherwise, use a thread repair kit.

Q4

Do I need to use new bolts when working with engine components?

Certain bolts, especially those used in critical areas like the cylinder head or connecting rods, are designed to stretch when tightened to a specific torque. These bolts, often called torque-to-yield bolts, should always be replaced with new ones as they cannot maintain their original integrity once stretched. Always consult the Acura repair manual to determine if a specific bolt needs to be replaced. For example, cylinder head bolts on the 3.5L engine are typically torque-to-yield and need replacement.

Q5

What does 'torque-to-yield' mean, and how does it affect the tightening process?

Torque-to-yield (TTY) bolts are designed to stretch past their elastic limit when tightened. This ensures consistent clamping force, but means they must be replaced after each use. The tightening procedure for TTY bolts typically involves an initial torque value followed by one or more angle-turn steps (e.g., tighten to 30 ft-lbs, then turn 90 degrees further). Using a standard torque only will not achieve proper clamping force and can lead to bolt failure.

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 specified torque values, preventing damage.

  • 1/2" drive for common bolt sizes on the 3.5L engine
  • Range of 10-150 ft-lbs torque (or equivalent Nm)
  • Audible click or digital display indicating achieved torque
Learn more

Torque Wrench (3/8" Drive)

A smaller torque wrench for lower torque bolts

  • 3/8" drive for smaller bolts on the 3.5L engine
  • Range of 5-80 ft-lbs torque (or equivalent Nm)
  • Audible click or digital display indicating achieved torque
Learn more

Socket Set (Metric)

A comprehensive socket set covering various metric sizes required for the 3.5L engine bolts.

  • Includes sockets ranging from 8mm to 24mm
  • 6-point sockets for optimal grip and reduced rounding
  • Variety of socket depths (shallow and deep)
Learn more

Extension Bars

Extension bars help reach recessed bolts with the torque wrench.

  • Various lengths for different access situations
  • 1/2" and 3/8" drive compatibility
Learn more

Universal Joint

A universal joint (swivel socket adapter) allows for tightening bolts at an angle.

  • 1/2" and 3/8" drive compatibility
Learn more
Service Procedures

Cylinder Head Bolt Tightening Procedure

The following procedure outlines the correct tightening sequence and torque specifications for cylinder head bolts on the 3.5L engine.

  • Clean all bolt threads and mating surfaces.
  • Apply a light coat of engine oil to the bolt threads.
  • Install all cylinder head bolts by hand.
  • Tighten all bolts in the specified sequence to the first torque value: 29 lb-ft (39 Nm).
  • Tighten all bolts in the specified sequence to the second torque value: 65 lb-ft (88 Nm).
  • Tighten all bolts an additional 90 degrees in the specified sequence.
  • Verify all bolts are tightened to specifications.
  • Note: Refer to the specific torque pattern from repair manual.
View full procedure

Intake Manifold Bolt Tightening Procedure

The following procedure outlines the correct tightening sequence and torque specifications for intake manifold bolts on the 3.5L engine.

  • Clean all bolt threads and mating surfaces.
  • Install all intake manifold bolts by hand.
  • Tighten all bolts in the specified sequence to 16 lb-ft (22 Nm).
  • Verify all bolts are tightened to specifications.
  • Note: Refer to the specific torque pattern from repair manual.
View full procedure

Rocker Arm Cover Bolt Tightening Procedure

The following procedure outlines the correct tightening sequence and torque specifications for rocker arm cover bolts on the 3.5L engine.

  • Clean all bolt threads and mating surfaces.
  • Install all rocker arm cover bolts by hand.
  • Tighten all bolts in the specified sequence to 8.7 lb-ft (12 Nm).
  • Verify all bolts are tightened to specifications.
  • Note: Refer to the specific torque pattern from repair manual.
View full procedure

Connecting Rod Cap Bolt Tightening Procedure

The following procedure outlines the correct tightening sequence and torque specifications for connecting rod cap bolts on the 3.5L engine.

  • Clean all bolt threads and mating surfaces.
  • Apply a light coat of engine oil to the bolt threads.
  • Install all connecting rod cap bolts by hand.
  • Tighten all bolts in the specified sequence to 15 lb-ft (20 Nm).
  • Tighten all bolts an additional 90 degrees in the specified sequence.
  • Verify all bolts are tightened to specifications.
  • Note: Refer to the specific torque pattern from repair manual.
View full procedure
Technical Service Bulletins

Engine Oil Leak from Timing Chain Cover

2017-03-15

Some 2014-2017 Acura RLX vehicles with the 3.5L engine may experience an oil leak from the timing chain cover due to improper sealing.

2014-2017

Resolution: Replace the timing chain cover gasket using a revised sealant application procedure. Ensure all bolts are torqued to the specified 8.7 lb-ft (12 Nm).

Abnormal Engine Noise from Drive Belt Tensioner

2018-11-20

Certain 2017-2019 Acura RLX models with the 3.5L engine may exhibit abnormal engine noise due to a faulty drive belt tensioner.

2017-2019

Resolution: Replace the drive belt tensioner and verify proper torque of all mounting bolts to the specified 16 lb-ft (22 Nm).

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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