Acura RL 2005-2012 3.7L Engine Bolt Torque Specifications & Fastener Values
Acura RL 2005-2012

Acura RL 2005-2012 3.7L Engine Bolt Torque Specifications

Comprehensive torque specifications for various bolts on the 3.7L V6 engine found in the 2005-2012 Acura RL. Includes critical torque values for engine assembly, cylinder head, intake manifold, exhaust manifold, 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

3.7l-engine Cylinder Head

Torque specifications for the cylinder head and related components.

1

Cylinder Head Bolts

M11 x 1.5
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Tighten cylinder head bolts in the correct sequence to ensure even clamping pressure. Refer to the service manual for the specific tightening pattern.
2

Rocker Arms/Shafts Bolts

M8 x 1.25
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Tighten these bolts evenly to ensure proper rocker arm shaft alignment.
3

Camshaft Bearing Cap Bolts

M8 x 1.25
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Tighten camshaft bearing cap bolts evenly in the correct sequence to ensure proper camshaft alignment. Estimated value based on similar engine components.
4

Valve Cover Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Tighten valve cover bolts evenly to prevent leaks. Use a criss-cross pattern.
5

Spark Plugs

M14 x 1.25
Torque Value
13 ft-lbs (18 N·m)
Important Notes
Ensure the spark plug threads are clean and that plugs are torqued correctly. Do not overtighten.

3.7l-engine Block

Torque specifications for engine block components.

1

Main Bearing Bolts

M12 x 1.75
Torque Value
56 ft-lbs (76 N·m)
Important Notes
Tighten main bearing bolts in the correct sequence to ensure proper crankshaft alignment and bearing clearances.
2

Connecting Rod Nuts

M9 x 1.25
Torque Value
24 ft-lbs (33 N·m)
Important Notes
Tighten connecting rod nuts evenly to ensure correct bearing crush.
3

Oil Pan Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Tighten oil pan bolts evenly in a criss-cross pattern to prevent leaks.
4

Timing Belt/Chain Tensioner Bolt

M8 x 1.25
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Ensure proper tensioner installation and torque to maintain correct timing belt/chain tension.
5

Crankshaft Position Sensor Bolt

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Ensure the crankshaft position sensor is securely mounted. Estimated value.
6

Oil Filter Housing Bolt

M12 x 1.75
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure proper torque for secure oil filter housing seal.
7

Oil Drain Plug Bolt

M14 x 1.5
Torque Value
29 ft-lbs (39 N·m)
Important Notes
Tighten the oil drain plug to the correct torque to prevent leaks and avoid damaging threads.

3.7l-engine Intake System

Torque specifications for the intake system components.

1

Intake Manifold Bolts

M8 x 1.25
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Tighten intake manifold bolts in the correct sequence to ensure a tight seal and prevent vacuum leaks. Refer to the service manual for the specific tightening pattern.
2

Throttle Body Bolts

M6 x 1.0
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Tighten throttle body bolts evenly to prevent air leaks.
3

EGR Valve Bolts

M6 x 1.0
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Tighten EGR valve bolts evenly to prevent exhaust leaks and ensure proper function.
4

Fuel Rail Bolts

M6 x 1.0
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Tighten fuel rail bolts evenly to prevent fuel leaks.
5

Fuel Injector Bolts

M6 x 1.0
Torque Value
13 ft-lbs (18 N·m)
Important Notes
Tighten fuel injector bolts evenly to maintain a fuel-tight seal.

3.7l-engine Exhaust System

Torque specifications for the exhaust system components.

1

Exhaust Manifold/Headers Bolts

M8 x 1.25
Torque Value
23 ft-lbs (31 N·m)
Important Notes
Tighten exhaust manifold/header bolts in the correct sequence to prevent exhaust leaks. Refer to the service manual for the specific tightening pattern.
2

Exhaust Manifold/Headers to Cylinder Head Bolts

M8 x 1.25
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Tighten exhaust manifold bolts to cylinder head evenly to prevent leaks.

3.7l-engine Cooling System

Torque specifications for cooling system components.

1

Water Pump Bolts

M8 x 1.25
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Tighten water pump bolts evenly to ensure a secure and leak-free mount.
2

Water Pump Pulley Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten water pump pulley bolts evenly to prevent loosening and system malfunction.
3

Thermostat Housing Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten thermostat housing bolts evenly to prevent coolant leaks.

3.7l-engine Accessories And Other

Torque specifications for engine accessories and other miscellaneous components.

1

Crankshaft Pulley/Harmonic Balancer Bolt

M16 x 1.5
Torque Value
181 ft-lbs (245 N·m)
Important Notes
Ensure the crankshaft pulley/harmonic balancer bolt is torqued to spec to prevent it from loosening.
2

Flywheel Bolts

M10 x 1.25
Torque Value
94 ft-lbs (128 N·m)
Important Notes
Tighten flywheel bolts evenly to ensure secure power transmission.
3

Camshaft Sprocket Bolt

M10 x 1.25
Torque Value
50 ft-lbs (68 N·m)
Important Notes
Ensure camshaft sprocket bolts are properly torqued for correct timing and secure mounting.
4

Ignition Coil Bolt

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Tighten ignition coil bolts to the specified torque for secure electrical connections.
5

Power Steering Pump Mounting Bolts

M8 x 1.25
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Tighten power steering pump mounting bolts to the specified torque to prevent vibration and ensure secure mounting.
6

Engine Mount Bolts to Block

M12 x 1.75
Torque Value
40 ft-lbs (54 N·m)
Important Notes
Tighten engine mount bolts to the block to prevent excessive vibration and ensure proper mounting of the engine to the chassis. Estimated Value.

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

What happens if I overtighten a bolt?

Overtightening a bolt, especially in aluminum engine components like those in the 3.7L Acura RL engine, can lead to thread stripping, bolt breakage, or damage to the component itself. This can result in oil leaks, coolant leaks, or engine damage. For example, overtightening a cylinder head bolt could cause the head to warp, requiring expensive repairs.

Q2

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

No, torque-to-yield (TTY) bolts, often used in critical applications like cylinder heads, must not be reused. These bolts are designed to stretch when tightened and permanently deform, providing optimal clamping force. Reusing them could lead to improper torque, loose fasteners, and potential engine failure. Always replace TTY bolts with new ones from a reputable manufacturer.

Q3

Should I use lubricant on threads before tightening?

Yes, lubrication is often necessary, but it depends on the fastener type and specified process in the Acura service manual. For some fasteners, a light coat of clean engine oil or thread lubricant is required to achieve correct torque values. However, using lubrication when not specified can result in overtorquing due to reduced friction, therefore always consult the factory service manual.

Q4

How often should I check engine bolt torque?

For most applications, once torqued to specification, the bolts should maintain correct tension unless disturbed. However, following repairs, particularly involving gasket replacement (e.g. valve cover gaskets), its prudent to double-check the bolt torque after an initial heat cycle to account for settling.

Q5

Where do I find the exact torque specifications?

The official Acura service manual for the 2005-2012 RL is the most reliable source for torque specifications. These manuals can often be found online or through a reputable automotive parts retailer. Never rely solely on online forums for these specs as they may be inaccurate.

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 accurate tightening of bolts to manufacturer specifications. A 1/2 inch drive is recommended for most engine components.

  • Wide torque range (e.g., 20-150 ft-lbs)
  • Accurate calibration
  • Durable construction
Learn more

Torque Wrench (3/8 inch drive)

A calibrated torque wrench is needed for smaller bolts. A 3/8 inch drive is usually used for smaller fasteners.

  • Wide torque range (e.g., 5-80 ft-lbs or in-lbs)
  • Accurate calibration
  • Durable construction
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets is needed to fit various bolt heads found on the 3.7L engine. Both deep and shallow sockets are useful.

  • Comprehensive range of metric sizes
  • Durable construction
  • Variety of socket types (deep, shallow)
Learn more

Extension Bars

Extension bars provide extra reach for accessing recessed bolts.

  • Various lengths available
  • Durable construction
  • Different drive sizes (1/2 inch, 3/8 inch)
Learn more

Universal Joint

A universal joint allows the socket to be used at an angle, useful when bolts are not in direct line of sight.

  • Durable construction
  • Secure connection
  • Multiple drive sizes available
Learn more
Service Procedures

Cylinder Head Bolt Tightening Procedure

Proper tightening of the cylinder head bolts is critical to ensure proper cylinder compression and sealing. Follow a specific torque sequence and multiple passes are needed.

  • Clean all bolt threads and ensure they are free of oil and debris.
  • Install cylinder head and lightly thread all bolts.
  • Torque all bolts to first torque specification according to sequence.
  • Torque all bolts to second torque specification according to sequence.
  • Angle tighten according to specification using an angle guage.
View full procedure

Intake Manifold Bolt Tightening Procedure

Correct torque for the intake manifold bolts ensures proper sealing and prevents vacuum leaks. Follow a specific torque sequence to avoid uneven pressure.

  • Clean all bolt threads and ensure they are free of oil and debris.
  • Install intake manifold and lightly thread all bolts.
  • Torque all bolts to specification according to the sequence.
  • Recheck torque after engine has reached operating temperature and cooled.
View full procedure

Rocker Arm Assembly Bolt Tightening Procedure

Correct torque of the rocker arm assembly bolts is essential for proper valve train operation. Use a specific torque sequence to prevent binding or damage.

  • Clean all bolt threads and ensure they are free of oil and debris.
  • Install rocker arm assembly and lightly thread all bolts.
  • Torque all bolts to specification according to sequence.
  • Verify proper valve lash after torquing.
View full procedure

Connecting Rod Cap Bolt Tightening Procedure

Connecting rod cap bolts require precise torque and angle tightening to ensure proper clamping force.

  • Clean all bolt threads and ensure they are free of oil and debris.
  • Install connecting rod cap and lightly thread all bolts.
  • Torque all bolts to first torque specification according to sequence.
  • Angle tighten all bolts according to specification using an angle gauge.
View full procedure

Oil Pan Bolt Tightening Procedure

Proper torque on the oil pan bolts prevents oil leaks. A specific torque sequence is recommended to distribute the clamping force evenly.

  • Clean all bolt threads and ensure they are free of oil and debris.
  • Install oil pan and lightly thread all bolts.
  • Torque all bolts to specification according to the sequence.
View full procedure
Technical Service Bulletins

Cylinder Head Bolt Re-Torque Procedure Update

2008-05-12

This bulletin revises the cylinder head bolt tightening procedure for the 3.7L engine. Improper tightening can lead to head gasket failure.

2005-2008

Resolution: Follow the updated torque sequence and ensure bolts are torqued to the revised specification.

Intake Manifold Bolt Torque Specification Change

2010-03-20

This bulletin announces a change to the intake manifold torque specification to prevent vacuum leaks at the intake manifold gasket.

2009-2012

Resolution: Use the new torque specification when servicing the intake manifold. Discard the old torque specifications.

Connecting Rod Bolt Angle Tightening Clarification

2007-11-15

This bulletin clarifies the procedure for connecting rod cap bolt angle tightening, specifying the use of an angle gauge.

2005-2007

Resolution: Use an accurate angle gauge to tighten bolts to the specified angle after reaching the first torque setting.

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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