Acura TL 2004-2008 3.2L Engine Bolt Torque Specifications & Fastener Values
Acura TL 2004-2008

Acura TL 2004-2008 3.2L Engine Bolt Torque Specifications

Comprehensive torque specifications for various bolts on the 3.2L engine found in the 2004-2008 Acura TL. Includes torque values for cylinder head bolts, main bearing caps, connecting rod bolts, 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

3.2l-engine Cylinder Head

Torque specifications for the cylinder head and related components.

1

Cylinder Head Bolts

M12 x 1.75 (Estimated)
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Cylinder head bolts typically require an angle torque procedure after the initial torque. Refer to the service manual for angle torque spec. Bolt size is estimated.
2

Camshaft Bearing Cap Bolts

M8 x 1.25 (Estimated)
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Tighten in a sequence working from the center outward. Bolt size is estimated.
3

Valve Cover Bolts

M6 x 1.0 (Estimated)
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten in a cross pattern to ensure even sealing. Bolt size is estimated.
4

Rocker Arms/Shafts Bolts

M8 x 1.25 (Estimated)
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Tighten in a specified sequence for proper valve train alignment. Bolt size is estimated.
5

Exhaust Manifold/Headers to Cylinder Head Bolts

M8 x 1.25 (Estimated)
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Tighten all bolts to the specified torque in a cross pattern. Bolt size is estimated.

3.2l-engine Block

Torque specifications for engine block components.

1

Main Bearing Bolts

M12 x 1.75 (Estimated)
Torque Value
56 ft-lbs (76 N·m)
Important Notes
Tighten in a specified sequence. Bolt size is estimated.
2

Oil Pan Bolts

M6 x 1.0 (Estimated)
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten in a cross pattern to ensure even sealing. Bolt size is estimated.
3

Knock Sensor Bolt

M8 x 1.25 (Estimated)
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Bolt size is estimated.
4

Engine Mount Bolts (Engine Block/Bracket)

M10 x 1.5 (Estimated)
Torque Value
45 ft-lbs (61 N·m)
Important Notes
Torque varies by location. This is an estimated range, consult specific diagrams for each mount location. Bolt size is estimated.
5

Timing Cover Bolts

M6 x 1.0 (Estimated)
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten the timing cover bolts in a cross pattern to ensure even sealing. Bolt size is estimated.
6

Water Pump Bolts

M8 x 1.25 (Estimated)
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Tighten in a cross pattern to ensure proper sealing. Bolt size is estimated.
7

Oil Drain Plug Bolt

M14 x 1.5 (Estimated)
Torque Value
29 ft-lbs (39 N·m)
Important Notes
Bolt size is estimated. Always use a new crush washer.

3.2l-engine Intake Manifold

Torque specifications for the intake manifold and related components.

1

Intake Manifold Bolts

M8 x 1.25 (Estimated)
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Tighten in a cross pattern to ensure even sealing. Bolt size is estimated.
2

Throttle Body Bolts

M6 x 1.0 (Estimated)
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Tighten in a cross pattern to ensure proper sealing. Bolt size is estimated.
3

EGR Valve Bolts

M6 x 1.0 (Estimated)
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Bolt size is estimated.
4

Fuel Rail Bolts

M6 x 1.0 (Estimated)
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Bolt size is estimated.
5

Fuel Injector Bolts/Clips

M6 x 1.0 (Estimated)
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Some injectors use clips or clamps rather than bolts. Bolt size is estimated.

3.2l-engine Timing System

Torque specifications for components related to the timing system.

1

Timing Belt/Chain Tensioner Bolt

M10 x 1.5 (Estimated)
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Bolt size is estimated.
2

Camshaft Sprocket Bolt

M10 x 1.25 (Estimated)
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Bolt size is estimated.

3.2l-engine Crankshaft

Torque specifications for components related to the crankshaft.

1

Flywheel Bolts

M10 x 1.25 (Estimated)
Torque Value
76 ft-lbs (103 N·m)
Important Notes
Bolt size is estimated.
2

Crankshaft Pulley/Harmonic Balancer Bolt

M14 x 1.5 (Estimated)
Torque Value
181 ft-lbs (245 N·m)
Important Notes
Bolt size is estimated. Always use a new bolt when installing this component.
3

Connecting Rod Nuts

M9 x 1.25 (Estimated)
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Connecting rod nuts typically require an angle torque procedure after the initial torque. Refer to the service manual for angle torque spec. Bolt size is estimated.

3.2l-engine Cooling System

Torque specifications for components related to the cooling system.

1

Water Pump Pulley Bolts

M6 x 1.0 (Estimated)
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Bolt size is estimated.
2

Thermostat Housing Bolts

M6 x 1.0 (Estimated)
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten in a cross pattern. Bolt size is estimated.

3.2l-engine Accessory Drive

Torque specifications for components related to the accessory drive system.

1

Serpentine/Accessory Drive Belt Tensioner Bolt

M10 x 1.5 (Estimated)
Torque Value
31 ft-lbs (42 N·m)
Important Notes
Bolt size is estimated.
2

Drive Belt Idler Pulley Bolt

M10 x 1.5 (Estimated)
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Bolt size is estimated.
3

A/C Compressor Bracket Bolts

M10 x 1.5 (Estimated)
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Tighten all bolts to 33 ft-lbs (45 N·m). Bolt size is estimated.
4

Power Steering Pump Bracket Bolts

M10 x 1.5 (Estimated)
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Tighten all bolts to 33 ft-lbs (45 N·m). Bolt size is estimated.

3.2l-engine Ignition

Torque specifications for components related to the ignition system.

1

Spark Plugs

M14 x 1.25 (Estimated)
Torque Value
13 ft-lbs (18 N·m)
Important Notes
Tighten to the specified torque using a torque wrench. Do not over tighten. Bolt size is estimated.
2

Ignition Coil Bolt

M6 x 1.0 (Estimated)
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Bolt size is estimated.

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?

Using the correct torque specification ensures that bolts are tightened enough to hold components securely without causing damage. Over-tightening can lead to stripped threads, broken bolts, or warped components, while under-tightening can result in loose connections, leaks, and eventual component failure. For example, improperly torquing a cylinder head bolt on your 3.2L engine could lead to a blown head gasket or engine damage.

Q2

What should I use to measure torque accurately?

A calibrated torque wrench is essential for accurate torque application. There are two main types: click-type and beam-type. Click-type torque wrenches are more common and 'click' when the set torque is reached, while beam-type wrenches use a pointer against a scale. Ensure your torque wrench is within its calibration period for accurate readings. Avoid using an impact wrench unless specified for initial tightening, as they lack fine control for precise torquing. For instance, an impact wrench would not be suitable for the precise low-torque requirements of a valve cover.

Q3

What if I don't have the exact torque wrench specified?

While having the correct torque wrench is ideal, you can use a range as a guideline. However, be aware that going too far above or below the specification can cause issues. If a range is provided, aim for the midpoint. For example, if the spec is 16-22 lb-ft, try for 19 lb-ft if unable to be precise. If you are unsure, it is always best to err on the side of under-torqueing and double-checking rather than over-torquing.

Q4

Are torque specs different for bolts with threadlocker?

Yes, the presence of threadlocker can sometimes affect the torque required. While general torque specifications might not explicitly state the use of threadlocker, it's essential to refer to specific repair manuals. Usually, a reduction in the specified torque is not required when using medium-strength thread locker (like Loctite 242) but always double-check to be sure. Some bolts may come pre-coated with threadlocker, or have specific tightening procedures. For instance, if your intake manifold bolt has old threadlocker residue, it's better to clean it and apply a small amount of fresh medium threadlocker.

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 1/2-inch drive torque wrench is essential for accurately tightening bolts to the specified torque values. It allows for precise torque application, preventing over-tightening or under-tightening.

  • Wide torque range to cover engine specifications
  • Clear, easy-to-read display
  • Click mechanism for accurate torque indication
Learn more

Torque Wrench (3/8-inch drive)

A 3/8-inch drive torque wrench is beneficial for accessing bolts in tighter spots and is useful for less critical torque applications.

  • Good for smaller bolt sizes
  • More compact for tight areas
  • Accurate torque measurement
Learn more

Socket Set (Metric)

A complete set of metric sockets is necessary to fit the various bolt heads on the 3.2L engine.

  • Comprehensive range of sizes
  • Durable construction
  • Clear size markings
Learn more

Socket Extensions

Socket extensions of varying lengths are required to access recessed or hard-to-reach bolts.

  • Various lengths for different access needs
  • Durable construction
  • Secure attachment
Learn more

Universal Joint

A universal joint allows the socket to be angled, which is critical for accessing bolts that are not directly in line.

  • Allows for angled socket access
  • Strong and durable
  • Provides smooth joint rotation
Learn more
Service Procedures

Cylinder Head Bolt Tightening Procedure

This procedure outlines the proper steps to tighten the cylinder head bolts to the specified torque and sequence.

  • Clean all bolt holes and bolts.
  • Apply a light coat of engine oil to the bolt threads and under the bolt head.
  • Install all cylinder head bolts finger tight.
  • Tighten all cylinder head bolts to 22 lb-ft (30 Nm) in the correct sequence.
  • Tighten all cylinder head bolts to 49 lb-ft (66 Nm) in the correct sequence.
  • Turn all cylinder head bolts an additional 90 degrees in the correct sequence.
  • Turn all cylinder head bolts an additional 90 degrees in the correct sequence.
View full procedure

Main Bearing Cap Bolt Tightening Procedure

This procedure details how to properly tighten the main bearing cap bolts to ensure proper crankshaft support and engine performance.

  • Clean all bolt holes and bolts.
  • Apply a light coat of engine oil to the bolt threads and under the bolt head.
  • Install all main bearing cap bolts finger tight.
  • Tighten all main bearing cap bolts to 22 lb-ft (30 Nm) in the correct sequence.
  • Tighten all main bearing cap bolts to 49 lb-ft (66 Nm) in the correct sequence.
View full procedure

Connecting Rod Cap Bolt Tightening Procedure

This procedure ensures the connecting rod cap bolts are tightened to the correct torque for safe and proper engine function.

  • Clean all bolt holes and bolts.
  • Apply a light coat of engine oil to the bolt threads and under the bolt head.
  • Install all connecting rod cap bolts finger tight.
  • Tighten all connecting rod cap bolts to 16 lb-ft (22 Nm)
  • Turn all connecting rod cap bolts an additional 45 degrees
View full procedure

Intake Manifold Bolt Tightening Procedure

This procedure ensures the intake manifold bolts are tightened to the correct torque for a secure seal and optimal engine performance.

  • Clean all bolt holes and bolts.
  • Install all intake manifold bolts finger tight.
  • Tighten all intake manifold bolts to 16 lb-ft (22 Nm) in the correct sequence.
View full procedure

Exhaust Manifold Bolt Tightening Procedure

This procedure ensures the exhaust manifold bolts are tightened to the correct torque for a secure seal and optimal exhaust performance.

  • Clean all bolt holes and bolts.
  • Install all exhaust manifold bolts finger tight.
  • Tighten all exhaust manifold bolts to 23 lb-ft (31 Nm) in the correct sequence.
View full procedure
Technical Service Bulletins

Oil Leak from Cylinder Head Area

2006-05-15

Some 2004-2006 Acura TL models may experience oil leaks from the cylinder head area due to inadequate sealing. This may require re-torquing the cylinder head bolts and replacement of the head gasket.

2004-2006

Resolution: Inspect cylinder head and gasket. Ensure bolts are tightened to the correct torque sequence. Replace the head gasket as needed.

Excessive Engine Noise on Startup

2007-11-20

Some 2005-2008 Acura TL models may experience excessive engine noise during cold starts. This may be related to the connecting rod cap bolts and correct torque.

2005-2008

Resolution: Inspect the connecting rod cap bolts. Ensure the bolts are tightened to specification using the correct angle torque procedure.

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