Acura CL 1997-1999 3.0L Engine Bolt Torque Specifications & Fastener Values
Acura CL 1997-1999

Acura CL 1997-1999 3.0L Engine Bolt Torque Specifications

Detailed torque specifications for the 3.0L engine bolts in the 1997-1999 Acura CL. Includes cylinder head, main bearing, connecting rod, and other critical bolt torque values.

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
Important Notes
Cylinder head bolts require an additional torque sequence or angle-torque tightening procedure after the initial torque. Refer to the service manual for specific instructions and tightening sequence. Torque-to-yield bolts, replace bolts before re-assembly.
2

Camshaft Bearing Cap Bolts

M8 x 1.25
Torque Value
12 ft-lbs (16 N·m)
Important Notes
These bolts secure the camshaft bearing caps to the cylinder head. Ensure proper alignment of the bearing caps before torquing. Use a criss-cross pattern when torquing.
3

Valve Cover Bolts

M6 x 1.0
Torque Value
7 ft-lbs (9 N·m)
Important Notes
Tighten bolts in a criss-cross pattern to ensure even sealing. Avoid over-tightening.
4

Rocker Arms/Shafts Bolts

M8 x 1.25
Torque Value
14 ft-lbs (19 N·m)
Important Notes
These bolts secure the rocker arm shafts to the cylinder head. Make sure to install the bolts evenly and in the correct orientation.
5

Spark Plugs

M14 x 1.25
Torque Value
13 ft-lbs (18 N·m)
Important Notes
Ensure proper thread engagement by starting spark plugs by hand. Avoid over-tightening.

3.0l-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 clamping of the crankshaft. Ensure bolts are properly lubricated.
2

Connecting Rod Nuts

M9 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure the connecting rod cap is properly aligned before torquing. Always replace nuts when reassembling, ensure that they are lubricated properly.
3

Oil Pan Bolts

M6 x 1.0
Torque Value
7 ft-lbs (9.5 N·m)
Important Notes
Tighten oil pan bolts in a criss-cross pattern to ensure even sealing.
4

Timing Belt/Chain Tensioner Bolt

M10 x 1.5
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Ensure the tensioner is properly positioned before torquing.
5

Oil Filter Housing Bolt

M8 x 1.25
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Ensure the sealing surfaces are clean and the oil filter housing is properly aligned before torquing.
6

Oil Drain Plug Bolt

M14 x 1.5
Torque Value
29 ft-lbs (39 N·m)
Important Notes
Always use a new sealing washer, when replacing the oil drain plug. Avoid over tightening.
7

Water Pump Bolts

M8 x 1.25
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Tighten water pump bolts in a criss-cross pattern to ensure proper seal.
8

Thermostat Housing Bolts

M8 x 1.25
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Ensure the thermostat is properly positioned and the sealing surfaces are clean before torquing.
9

Serpentine/Accessory Drive Belt Tensioner Bolt

M10 x 1.5
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Ensure the tensioner is properly aligned and the belt has the correct tension.
10

Drive Belt Idler Pulley Bolt

M10 x 1.5
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Ensure that the idler pulley is properly aligned.
Page 1 of 2

3.0l-engine Intake Manifold

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 bolts in a criss-cross pattern to ensure even sealing. Avoid over-tightening.
2

Intake Manifold Support Bracket Bolts

M8 x 1.25
Torque Value
16 ft-lbs (22 N·m)
Important Notes
These bolts secure the intake manifold support bracket. Ensure proper alignment of the support bracket before torquing.
3

Throttle Body Bolts

M6 x 1.0
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Ensure the throttle body is correctly positioned before torquing.
4

EGR Valve Bolts

M8 x 1.25
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Ensure the EGR valve is correctly positioned before torquing.
5

Fuel Rail Bolts

M6 x 1.0
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Ensure proper seating and alignment before torquing the fuel rail.
6

Fuel Injector Bolts

M5 x 0.8
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Ensure proper seating and alignment of the fuel injectors.

3.0l-engine Exhaust Manifold

Torque specifications for the exhaust manifold and related components.

1

Exhaust Manifold/Headers Bolts

M8 x 1.25
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Tighten exhaust manifold bolts in the correct sequence to ensure a proper seal. Be sure to tighten bolts in multiple steps.

3.0l-engine Flywheel

Torque specifications for the flywheel.

1

Flywheel Bolts

M10 x 1.5
Torque Value
76 ft-lbs (103 N·m)
Important Notes
Ensure proper alignment of the flywheel before torquing. Always use new bolts.

3.0l-engine Accessory Drive

Torque specifications for the accessory drive system.

1

Crankshaft Pulley/Harmonic Balancer Bolt

M14 x 1.5
Torque Value
134 ft-lbs (182 N·m)
Important Notes
Use a crankshaft pulley holding tool to prevent rotation while torquing. Ensure proper alignment of the crankshaft pulley.
2

Water Pump Pulley Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Ensure proper alignment of the water pump pulley before torquing.

3.0l-engine Ignition

Torque specifications for the ignition system

1

Distributor Bolt(s)

M8 x 1.25
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Ensure that the distributor is correctly aligned and seated before tightening.

3.0l-engine Camshaft

Torque specifications for the camshaft and related components.

1

Camshaft Sprocket Bolt

M10 x 1.25
Torque Value
56 ft-lbs (76 N·m)
Important Notes
Ensure that the camshaft sprocket is properly aligned before torquing.

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 can stretch or break the bolt, damage the threads in the block or component, and potentially lead to leaks or component failure. For instance, overtightening the intake manifold bolts can crack the plastic, or stripping the oil pan bolts can cause leaks.

Q2

What happens if I under-tighten a bolt?

Under-tightening can cause a loss of clamping force, leading to vibrations, leaks, and eventually, component failure. A loose exhaust manifold bolt, for example, can result in exhaust leaks and a loss of engine performance.

Q3

Do I need to replace bolts every time I remove them?

While not always necessary, it's highly recommended to replace torque-to-yield (TTY) bolts, commonly used in head and main bearing applications, as they stretch upon installation and cannot be reused accurately. For other bolts, visually inspect for wear and replace if there is any signs of thread damage.

Q4

What is the difference between ft-lb and Nm?

Ft-lb (foot-pounds) and Nm (Newton-meters) are both units of torque. They are different measurement systems. 1 ft-lb is approximately equal to 1.356 Nm. It's crucial to use the correct unit specified for each bolt, or you will use the wrong torque.

Q5

Should I use oil or lubricant on the bolt threads?

Generally, unless specified otherwise, use a light application of engine oil on bolt threads. This helps ensure accurate torque readings and prevents seizing. For specific bolts, like those going into the aluminum block, some manufacturers recommend specific anti-seize lubricants, check the repair manual.

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 accurately tightening bolts to the specified torque.

  • 1/2 inch drive
  • Click-type mechanism for precise settings
  • Torque range suitable for engine components (typically 10-150 ft-lbs)
Learn more

Torque Wrench (3/8 inch drive)

A smaller torque wrench for smaller fasteners and lower torque applications.

  • 3/8 inch drive
  • Click-type mechanism for precise settings
  • Torque range suitable for engine components (typically 5-80 ft-lbs or inch-lbs)
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets to fit various bolt and nut sizes on the engine.

  • Various sizes ranging from 8mm to 19mm
  • 6-point sockets for secure grip
  • Commonly includes deep and shallow socket options
Learn more

Socket Extensions

Extensions in various lengths for reaching bolts in recessed areas.

  • Multiple lengths
  • 1/2 inch and 3/8 inch drive options
  • Durable construction
Learn more

Universal Joint Adapter

A universal joint to allow sockets to be used at angles, reaching difficult bolts.

  • 1/2 inch and 3/8 inch drive options
  • Durable construction
  • Allows for angled applications
Learn more

Torque Angle Meter (optional)

A torque angle meter may be needed for fasteners which require a torque-to-angle procedure

  • Measures angle of rotation after initial torque
  • Provides precise tightening
  • May be integrated in a digital torque wrench
Learn more
Service Procedures

Cylinder Head Bolt Torque Procedure

This procedure outlines the steps to properly tighten the cylinder head bolts on a 3.0L Acura CL engine. Always refer to the specific tightening pattern in the service manual.

  • Clean bolt threads and cylinder head bolt holes.
  • Lightly lubricate bolt threads with engine oil.
  • Install bolts and tighten to 29 ft-lbs following the correct tightening sequence.
  • Tighten to 51 ft-lbs following the correct tightening sequence
  • Turn each bolt an additional 90 degrees following the correct tightening sequence.
  • Turn each bolt an additional 90 degrees following the correct tightening sequence.
View full procedure

Intake Manifold Bolt Torque Procedure

This procedure outlines the steps to properly tighten the intake manifold bolts on a 3.0L Acura CL engine.

  • Clean bolt threads and intake manifold bolt holes.
  • Install bolts and tighten to 16 ft-lbs following the correct tightening sequence.
  • Verify torque after completing the torque sequence.
View full procedure

Exhaust Manifold Bolt Torque Procedure

This procedure outlines the steps to properly tighten the exhaust manifold bolts on a 3.0L Acura CL engine.

  • Clean bolt threads and exhaust manifold bolt holes.
  • Install bolts and tighten to 23 ft-lbs following the correct tightening sequence.
  • Verify torque after completing the torque sequence.
View full procedure

Crankshaft Pulley Bolt Torque Procedure

This procedure outlines the steps to properly tighten the crankshaft pulley bolt on a 3.0L Acura CL engine.

  • Clean bolt threads and crankshaft bolt hole.
  • Apply oil to threads.
  • Install bolt and tighten to 47 ft-lbs
  • Rotate the bolt an additional 60 degrees.
  • Verify torque after completing the torque sequence.
View full procedure

Connecting Rod Bolt Torque Procedure

This procedure outlines the steps to properly tighten the connecting rod bolts on a 3.0L Acura CL engine.

  • Clean bolt threads and connecting rod bolt holes.
  • Apply oil to threads.
  • Install bolts and tighten to 15 ft-lbs.
  • Tighten an additional 60 degrees
  • Verify torque after completing the torque sequence.
View full procedure
Technical Service Bulletins

Cylinder Head Bolt Retorque Recommendation

2000-05-15

Some engines may experience minor head gasket sealing issues if torque values are not precisely followed. Ensure the tightening procedure is adhered to.

1997-1999

Resolution: Re-torque cylinder head bolts after 1000 miles or after several heat cycles following the procedure in the service manual to ensure correct bolt torque.

Intake Manifold Gasket Leakage

1998-12-01

Instances of intake manifold gasket leakage have been reported on 1997 and early 1998 models. This may affect the torque values over time.

1997-1998

Resolution: Replace the intake manifold gasket and carefully torque intake manifold bolts to 16 ft-lbs, following the correct tightening sequence, then re-torque after several heat cycles.

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