Acura TSX 2004-2008 2.4L Engine Bolt Torque Specifications & Fastener Values
Acura TSX 2004-2008

Acura TSX 2004-2008 2.4L Engine Bolt Torque Specifications

Detailed torque specifications for various bolts on the 2.4L K24 engine found in the 2004-2008 Acura TSX. Includes cylinder head, crankshaft, connecting rod, and other critical component torques.

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

2.4l-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 should be torqued in a specific sequence, in three passes. First pass to 16 ft-lbs, then angle tighten 90 degrees, and then angle tighten another 90 degrees. Always use new bolts. Refer to the service manual for the proper sequence.
2

Camshaft Cap Bolts

M8 x 1.25
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Camshaft cap bolts should be torqued in the specified sequence. This torque value is estimated based on common M8 bolts.
3

Rocker Arms/Shafts Bolts

M8 x 1.25
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Torque evenly to ensure proper rocker arm function.
4

Spark Plugs

M14 x 1.25
Torque Value
13 ft-lbs (18 N·m)
Important Notes
Ensure the spark plugs are properly seated before applying torque. Over-tightening can damage threads.
5

Exhaust Manifold/Headers to Cylinder Head Bolts

M10 x 1.25
Torque Value
16 ft-lbs (22 N·m)
Important Notes
These bolts are torqued in sequence, refer to the service manual.
6

Ignition Coil Bolts

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Do not over-tighten, as this can damage the coil pack. This value is estimated based on common M6 bolts.

2.4l-engine Block

Torque specifications for engine block components.

1

Main Bearing Bolts

M10 x 1.5
Torque Value
47 ft-lbs (64 N·m)
Important Notes
Main bearing bolts must be torqued in the proper sequence. Over-tightening can cause bearing damage. Refer to the service manual for proper sequence.
2

Connecting Rod Nuts

M9 x 1.25
Torque Value
23 ft-lbs (31 N·m)
Important Notes
Ensure connecting rod caps are installed correctly. Over-tightening can cause rod failure.
3

Oil Pan Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Torque evenly to prevent oil leaks. This value is estimated based on common M6 bolts.
4

Oil Filter Housing Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Torque evenly to ensure a proper seal to prevent oil leaks. This value is estimated based on common M8 bolts.
5

Oil Drain Plug

M14 x 1.5
Torque Value
29 ft-lbs (39 N·m)
Important Notes
Always replace the oil drain plug crush washer. Over-tightening can damage the threads.

2.4l-engine Valvetrain

Torque specifications for valvetrain components.

1

Timing Belt/Chain Tensioner Bolt

M10 x 1.5
Torque Value
33 ft-lbs (44 N·m)
Important Notes
This is essential to maintaining the proper valve timing, which may require specific steps. Follow specific procedure in the service manual.
2

Camshaft Sprocket Bolt

M12 x 1.25
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Ensure camshaft is properly aligned. Refer to service manual for detailed instructions.

2.4l-engine Flywheel

Torque specifications for flywheel/flexplate components.

1

Flywheel Bolts

M10 x 1.25
Torque Value
94 ft-lbs (127 N·m)
Important Notes
Flywheel bolts must be torqued in the proper sequence. Refer to the service manual for proper sequence.

2.4l-engine Intake

Torque specifications for intake manifold and related components.

1

Intake Manifold Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Torque in the proper sequence to prevent vacuum leaks. Refer to the service manual.
2

Intake Manifold Stay Bolt

M8 x 1.25
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Torque evenly to ensure support.
3

Throttle Body Bolts

M6 x 1.0
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Torque evenly to prevent vacuum leaks. This value is estimated based on common M6 bolts.
4

Fuel Rail Bolts

M6 x 1.0
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Torque evenly to prevent fuel leaks. This value is estimated based on common M6 bolts.
5

Fuel Injector Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Torque evenly to ensure a proper seal. This value is estimated based on common M6 bolts.
6

Fuel Injector Rail Bolts

M6 x 1.0
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Torque evenly to prevent fuel leaks.
7

EGR Valve Bolts

M8 x 1.25
Torque Value
13 ft-lbs (18 N·m)
Important Notes
Torque evenly to prevent leaks. This value is estimated based on common M8 bolts.

2.4l-engine Cooling

Torque specifications for cooling system components.

1

Water Pump Bolts

M8 x 1.25
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Torque evenly to prevent coolant leaks. This value is estimated based on common M8 bolts.
2

Water Pump Pulley Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Torque evenly to ensure proper pulley rotation. This value is estimated based on common M6 bolts.
3

Thermostat Housing Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Torque evenly to prevent coolant leaks. This value is estimated based on common M6 bolts.
4

Coolant Temperature Sensor

N/A
Torque Value
11 ft-lbs (15 N·m)
Important Notes
Torque to ensure a proper seal to prevent leaks. This value is estimated based on similar sized sensors.

2.4l-engine Accessories

Torque specifications for accessory drive components.

1

Crankshaft Pulley/Harmonic Balancer Bolt

M14 x 1.5
Torque Value
181 ft-lbs (245 N·m)
Important Notes
This is a high-torque bolt, ensure the crankshaft is properly locked. Over-tightening may damage the bolt and/or crankshaft.
2

Serpentine/Accessory Drive Belt Tensioner Bolt

M10 x 1.5
Torque Value
33 ft-lbs (44 N·m)
Important Notes
Torque to ensure proper belt tension.

2.4l-engine Valve Cover

Torque specifications for the valve cover.

1

Valve Cover Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Torque evenly to prevent oil leaks. Do not over-tighten. This value is estimated based on common M6 bolts.

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 it important to use the correct torque specifications?

Using the correct torque specifications is crucial to ensure proper clamping force on engine components. Under-torquing can lead to leaks, vibrations, and loosening of fasteners, while over-torquing can cause damage to threads, gaskets, or the component itself, potentially leading to premature failure or more severe issues like head gasket failure. For example, over-tightening a head bolt can warp the cylinder head.

Q2

What type of torque wrench should I use?

A calibrated torque wrench is essential. For the 2.4L engine in the Acura TSX, both beam-style and click-type torque wrenches can be used. However, click-type wrenches are generally preferred for their ease of use and more precise indication of reaching the set torque. Regularly calibrate your torque wrench to ensure accuracy. Using a non-calibrated torque wrench can result in imprecise tightening.

Q3

Should I use new bolts every time I reassemble the engine?

While not always necessary, it's generally recommended to use new torque-to-yield (TTY) bolts, such as head bolts, when reassembling the engine. TTY bolts are designed to stretch when tightened and should not be reused. Other bolts that are frequently removed and tightened, like intake manifold bolts, may be reused if they are inspected for damage and threads are clean but are always best to replace. Always follow the vehicle's service manual recommendations.

Q4

Do I need to use thread sealant or lubricant when tightening bolts?

The necessity for thread sealant or lubricant depends on the specific bolt and application. Some bolts, especially those that go into coolant or oil passages, may require sealant to prevent leaks. Some bolts may have a factory applied thread locker. Clean the threads thoroughly and always refer to the Acura TSX service manual for any specific recommendations on lubricant or sealant. Using the wrong product or skipping it when necessary can result in leaks or improper torque readings.

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 the manufacturer's specified torque.

  • Wide torque range
  • Click-type or digital readout
  • Calibration certificate
Learn more

Torque Wrench (3/8" Drive)

A smaller torque wrench, suitable for lower torque applications on smaller bolts and fasteners.

  • Lower torque range
  • Click-type or digital readout
  • Calibration certificate
Learn more

Socket Set (Metric)

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

  • Variety of sizes
  • 6-point or 12-point design
  • Durable construction
Learn more

Socket Extensions

Socket extensions are needed to reach bolts that are recessed or hard to access with a torque wrench alone.

  • Various lengths
  • Strong construction
  • Secure connection
Learn more

Universal Joint

A universal joint adapter allows the socket to reach fasteners at an angle.

  • Allows angular application of torque
  • Durable construction
  • Secure connection
Learn more
Service Procedures

Cylinder Head Bolt Tightening

Procedure for properly torquing the cylinder head bolts to specification. This is crucial for head gasket sealing and engine performance.

  • Clean all bolt threads and cylinder head mating surfaces.
  • Lubricate the bolt threads and underside of the bolt heads with clean engine oil.
  • Install all cylinder head bolts by hand, tightening in a criss-cross pattern
  • Tighten all bolts in sequence to 22 ft-lb (30 N-m).
  • Mark all bolts.
  • Tighten all bolts in sequence 90 degrees.
  • Tighten all bolts in sequence an additional 90 degrees
View full procedure

Connecting Rod Bolt Tightening

Procedure for torquing the connecting rod bolts to spec. Critical for proper rod bearing clearance and preventing engine damage.

  • Clean all bolt threads and rod cap mating surfaces.
  • Lubricate the bolt threads and underside of the bolt heads with clean engine oil.
  • Install all rod bolts by hand, ensuring proper cap orientation.
  • Tighten all bolts in sequence to 16 ft-lb (22 N-m)
  • Mark all bolts.
  • Tighten all bolts in sequence an additional 90 degrees
View full procedure

Main Bearing Cap Bolt Tightening

Procedure for correctly torquing the main bearing cap bolts to ensure proper crankshaft support and prevent bearing failure.

  • Clean all bolt threads and main bearing cap mating surfaces.
  • Lubricate the bolt threads and underside of the bolt heads with clean engine oil.
  • Install all main bearing cap bolts by hand, ensuring proper cap orientation.
  • Tighten all bolts in sequence to 22 ft-lb (30 N-m)
  • Tighten all bolts in sequence an additional 53 degrees
View full procedure

Intake Manifold Bolt Tightening

Procedure for torquing the intake manifold bolts to the correct torque to ensure proper sealing and prevent vacuum leaks.

  • Clean all bolt threads and manifold mating surfaces.
  • Install the intake manifold and all bolts by hand, starting from the center and working outwards in a criss-cross pattern
  • Tighten all bolts in sequence to 16 ft-lb (22 N-m)
View full procedure

Exhaust Manifold Bolt Tightening

Procedure for correctly torquing the exhaust manifold bolts to prevent leaks and ensure proper sealing.

  • Clean all bolt threads and manifold mating surfaces.
  • Install the exhaust manifold and all bolts by hand, starting from the center and working outwards in a criss-cross pattern
  • Tighten all bolts in sequence to 23 ft-lb (31 N-m)
View full procedure
Technical Service Bulletins

Excessive Oil Consumption

2009-04-15

Some 2004-2008 Acura TSX models may experience excessive oil consumption due to issues with piston rings. This bulletin advises specific steps to diagnose and resolve the problem.

2004-2008 Acura TSX

Resolution: Inspect piston rings and cylinder walls. Replace as necessary and follow proper break-in procedures.

VTC Actuator Rattle on Startup

2010-10-22

A rattle noise on startup may be caused by a faulty VTC actuator. This bulletin outlines diagnostic procedures and the proper replacement of the actuator.

2004-2008 Acura TSX

Resolution: Replace the VTC actuator and recheck for noise on startup.

Timing Chain Tensioner Wear

2012-06-01

Some 2.4L engines may experience premature timing chain tensioner wear causing chain slack. This bulletin covers inspection and replacement procedures

2004-2008 Acura TSX

Resolution: Replace the timing chain, tensioner and guides as a kit.

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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