Acura CL 2001-2003 3.2L Engine Bolt Torque Specifications & Fastener Values
Acura CL 2001-2003

Acura CL 2001-2003 3.2L Engine Bolt Torque Specifications

Comprehensive torque specifications for various bolts on the 3.2-liter V6 engine found in the 2001-2003 Acura CL, including cylinder head bolts, main bearing bolts, 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

Convert between different torque units

3.0l-engine Cylinder Head

Torque specifications for the cylinder head and related components.

1

Cylinder Head Bolts

M11 x 1.5 (Estimated)
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Use a proper tightening sequence. Estimated bolt size based on common cylinder head bolts.
2

Camshaft Bearing Cap Bolts

M8 x 1.25 (Estimated)
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Tighten following a similar sequence to the cylinder head bolts. Estimated size based on common bearing cap bolts.
3

Rocker Arms/Shafts Bolts

M8 x 1.25 (Estimated)
Torque Value
17 ft-lbs (23 N·m)
Important Notes
Ensure proper alignment of rocker arms before torquing. Estimated size based on common rocker arm bolts

3.0l-engine Block

Torque specifications for engine block components.

1

Main Bearing Bolts

M10 x 1.5 (Estimated)
Torque Value
56 ft-lbs (76 N·m)
Important Notes
Use a proper tightening sequence. Estimated bolt size based on common main bearing bolts.
2

Connecting Rod Nuts

M8 x 1.25 (Estimated)
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Ensure proper connecting rod cap alignment. Estimated size based on common con rod nuts
3

Oil Pan Bolts

M6 x 1.0 (Estimated)
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Use a proper tightening sequence to prevent leaks. Estimated size based on common oil pan bolts.
4

Oil Filter Housing Bolt

M8 x 1.25 (Estimated)
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Ensure sealing surface is clean and free of debris. Estimated bolt size.
5

Oil Drain Plug Bolt

M14 x 1.5 (Estimated)
Torque Value
29 ft-lbs (39 N·m)
Important Notes
Use a new crush washer for sealing. Estimated size based on common drain plugs.
6

Oil Control Jet Bolt(s)

M6 x 1.0 (Estimated)
Torque Value
8 ft-lbs (11 N·m)
Important Notes
If equipped, tighten to prevent leaks. Estimated bolt size based on similar components.
7

Knock Sensor Bolt

M8 x 1.25 (Estimated)
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Ensure proper sensor contact for accurate readings. Estimated bolt size.

3.0l-engine Valvetrain

Torque specifications for valvetrain components.

1

Camshaft Sprocket Bolt

M10 x 1.25 (Estimated)
Torque Value
56 ft-lbs (76 N·m)
Important Notes
Ensure camshaft is properly aligned before torquing. Estimated bolt size based on common sprocket bolts.
2

Timing Belt/Chain Tensioner Bolt

M10 x 1.25 (Estimated)
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Ensure proper tensioner alignment before torquing. Estimated bolt size based on common tensioner bolts.

3.0l-engine External Components

Torque specifications for external engine components.

1

Crankshaft Pulley/Harmonic Balancer Bolt

M16 x 1.5 (Estimated)
Torque Value
181 ft-lbs (245 N·m)
Important Notes
Use a crankshaft pulley holding tool. Estimated bolt size based on similar applications.
2

Flywheel Bolts

M10 x 1.25 (Estimated)
Torque Value
94 ft-lbs (127 N·m)
Important Notes
Ensure proper flywheel alignment. Estimated bolt size based on similar flywheel bolts.
3

Water Pump Bolts

M8 x 1.25 (Estimated)
Torque Value
11 ft-lbs (15 N·m)
Important Notes
Ensure proper water pump alignment and sealing. Estimated size based on common water pump bolts.
4

Water Pump Pulley Bolts

M6 x 1.0 (Estimated)
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Ensure pulley is properly seated and aligned on the water pump. Estimated size based on common pulley bolts.
5

Thermostat Housing Bolts

M8 x 1.25 (Estimated)
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Use a new gasket. Estimated size based on common thermostat bolts.

3.0l-engine Intake System

Torque specifications for intake components.

1

Intake Manifold Bolts

M8 x 1.25 (Estimated)
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Use a proper tightening sequence. Estimated bolt size based on common intake manifold bolts.
2

Throttle Body Bolts

M8 x 1.25 (Estimated)
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Ensure proper throttle body alignment. Estimated bolt size based on common throttle body bolts.
3

EGR Valve Bolts

M8 x 1.25 (Estimated)
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Ensure proper EGR valve alignment and use new gasket or sealant. Estimated bolt size based on similar components
4

Fuel Rail Bolts

M6 x 1.0 (Estimated)
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Ensure proper fuel rail alignment. Estimated bolt size based on common fuel rail bolts
5

Fuel Injector Bolts

M6 x 1.0 (Estimated)
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Ensure proper injector seating. Estimated bolt size based on similar fuel component bolts.

3.0l-engine Exhaust System

Torque specifications for exhaust components.

1

Exhaust Manifold/Headers Bolts

M8 x 1.25 (Estimated)
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Use a new exhaust gasket. Estimated bolt size based on common exhaust manifold bolts.

3.0l-engine Ignition System

Torque specifications for ignition components.

1

Spark Plugs

M14 x 1.25 (Estimated)
Torque Value
13 ft-lbs (18 N·m)
Important Notes
Use proper spark plug socket and do not overtighten. Estimated plug size.
2

Ignition Coil Bolt

M6 x 1.0 (Estimated)
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Ensure proper alignment of the coil. Estimated size based on similar component bolts

3.0l-engine Cooling System

Torque specifications for cooling components.

1

Coolant Temperature Sensor Bolt/Thread-In

M10 x 1.0 (Estimated)
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Ensure proper sealing to prevent leaks. Estimated size based on common sensors.

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 prevent component failure and ensure proper engine operation. Over-tightening can strip threads, deform components, and cause leaks. Under-tightening can lead to fasteners loosening, resulting in leaks, vibrations, and potential damage. For example, improperly torqued cylinder head bolts can cause head gasket failure and compression loss.

Q2

What type of torque wrench should I use?

A calibrated torque wrench is essential for achieving accurate torque specifications. Both click-type and beam-type torque wrenches are suitable, but digital torque wrenches offer the most precision. Ensure your torque wrench is in good working condition and calibrated regularly, ideally every year. Using a cheap or uncalibrated wrench can lead to inaccurate torquing and potential damage.

Q3

Do I need to use thread locker on all bolts?

No, thread locker is not required for all bolts. Refer to the service manual for specific recommendations. Typically, bolts that are prone to loosening due to vibration, such as those on the exhaust manifold or some engine mounts, might require a medium-strength (blue) thread locker. However, using thread locker on bolts where it is not recommended can make future removal difficult or damage the threads.

Q4

What does 'torque to yield' mean, and does it apply to my Acura CL 3.2L engine?

'Torque to yield' refers to bolts that are designed to stretch and deform slightly when tightened to their specified torque. This type of bolt is usually a one-time use item and must be replaced after removal. Some bolts in the 3.2L Acura CL engine, such as the cylinder head bolts, are torque-to-yield. Always consult the service manual for specific instructions and replace these bolts when necessary.

Q5

How do I properly torque bolts in a sequence?

Torquing bolts in a proper sequence, typically in a cross pattern or spiral pattern from the center outward, ensures even clamping force across the component. This prevents warping, uneven pressure, and potential leaks. The specific sequence is usually documented in the service manual for each component. For instance, when torquing the intake manifold, follow the recommended sequence to achieve a consistent seal.

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 high-quality torque wrench is essential for accurately tightening bolts to specified torque values. 1/2" drive is recommended for most engine fasteners.

  • Click-type mechanism
  • Accurate calibration in ft-lbs and Nm
  • Durable construction
Learn more

Torque Wrench (3/8" Drive)

A smaller 3/8" drive torque wrench is useful for smaller fasteners, especially within the engine bay.

  • Click-type mechanism
  • Accurate calibration in in-lbs and Nm
  • Compact size
Learn more

Socket Set (Metric)

A comprehensive socket set with various metric sizes is required to fit the fasteners on the 3.2L engine.

  • Variety of sizes
  • 6-point sockets
  • Durable material (chrome vanadium steel)
Learn more

Extension Bars (Various Lengths)

Extension bars allow for access to recessed or hard-to-reach fasteners.

  • Various lengths (3", 6", 10")
  • Durable material
  • Secure connection to sockets
Learn more

Universal Joint (Swivel)

A universal joint allows sockets to be used at angles for awkward fastener locations.

  • Durable construction
  • Smooth swivel motion
  • Secure socket connection
Learn more
Service Procedures

Cylinder Head Bolt Torque Procedure (3.2L)

Properly torquing the cylinder head bolts is crucial for sealing the engine and preventing leaks. This procedure should be performed with a calibrated torque wrench.

  • Apply a thin layer of clean engine oil to both the bolt threads and the underside of the bolt heads.
  • Install all cylinder head bolts by hand, and then snug them down with a socket wrench.
  • Tighten all cylinder head bolts in sequence to 22 ft-lbs (30 Nm).
  • Using the same sequence, tighten all cylinder head bolts to 47 ft-lbs (64 Nm).
  • Using the same sequence, turn each cylinder head bolt an additional 90 degrees.
  • Verify the final torque on all bolts.
View full procedure

Intake Manifold Bolt Torque Procedure (3.2L)

The intake manifold must be torqued down evenly to prevent vacuum leaks. Use a torque wrench and follow the manufacturer's specified torque sequence.

  • Install all intake manifold bolts by hand and snug them down.
  • Tighten the intake manifold bolts to 16 ft-lbs (22 Nm) using the specified sequence. Start with the inner bolts and work outwards in a cross pattern.
  • Verify the final torque on all bolts.
View full procedure

Rocker Arm Assembly Torque Procedure (3.2L)

Properly torquing the rocker arm assembly bolts is important for camshaft function. Follow the tightening sequence to prevent damage.

  • Install all rocker arm assembly bolts by hand and snug them down.
  • Tighten all rocker arm assembly bolts in sequence to 16 ft-lbs (22 Nm).
  • Verify the final torque on all bolts.
View full procedure

Oil Pan Bolt Torque Procedure (3.2L)

Properly torquing the oil pan bolts is important to prevent oil leaks. Use a torque wrench and follow the manufacturer's specified torque sequence.

  • Install all oil pan bolts by hand and snug them down.
  • Tighten the oil pan bolts to 9 ft-lbs (12 Nm) using the specified sequence, working in a cross pattern from the center outwards.
  • Verify the final torque on all bolts.
View full procedure

Connecting Rod Bolt Torque Procedure (3.2L)

Connecting rod bolts are very important and require careful torque and angle. Follow the manufacturer's specified procedure carefully

  • Apply a thin layer of clean engine oil to both the bolt threads and the underside of the bolt heads.
  • Install connecting rod bolts and snug them down.
  • Tighten the connecting rod bolts to 13 ft-lbs (18 Nm).
  • Using the same sequence, turn each connecting rod bolt an additional 60 degrees.
  • Verify the final torque and angle on all bolts.
View full procedure
Technical Service Bulletins

Cylinder Head Bolt Retorquing Recommendation

2002-05-15

Some early production 2001-2002 models may exhibit minor head gasket seepage due to the original torque specs. This bulletin recommends re-torquing procedure to address such concerns. Always follow updated procedure.

2001-2002 Acura CL 3.2L

Resolution: Verify the cylinder head bolt torque specification, and follow the updated tightening sequence. Ensure all bolts have been torqued to the specified values and angle.

Intake Manifold Gasket Leakage Issue

2003-01-20

Some 2002-2003 Acura CL models have reported intermittent intake manifold gasket leaks. This bulletin revises the tightening sequence and torque specifications for the intake manifold to ensure optimal seal.

2002-2003 Acura CL 3.2L

Resolution: Replace the intake manifold gasket, and use the revised torque procedure. Start with the inner bolts and work outwards in a cross pattern. Torque to 16 ft-lbs (22 Nm) and verify.

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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