Acura ILX 2013-2021 2.4L Engine Bolt Torque Specifications & Fastener Values
Acura ILX 2013-2021

Acura ILX 2013-2021 2.4L Engine Bolt Torque Specifications

This page provides a comprehensive list of torque specifications for various bolts on the 2.4L engine used in the 2013-2021 Acura ILX. Includes cylinder head bolts, main bearing cap bolts, connecting rod bolts, 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

2.4l-engine Cylinder Head

Torque specifications for the cylinder head and related components.

1

Cylinder Head Bolts

M10 x 1.25
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Tighten in multiple passes using the manufacturer-specified torque sequence. Refer to the service manual for the specific sequence.
2

Valve Cover Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Tighten bolts evenly to avoid warping the valve cover. Use a criss-cross pattern.
3

Rocker Arms/Shafts Bolts

M8 x 1.25
Torque Value
17 ft-lbs (23 N·m)
Important Notes
Tighten bolts evenly to maintain proper valve train geometry.
4

Exhaust Manifold/Headers to Cylinder Head Bolts

M8 x 1.25
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Tighten bolts evenly to prevent leaks. Use a criss-cross pattern.
5

Camshaft Sprocket Bolt

M12 x 1.25
Torque Value
56 ft-lbs (76 N·m)
Important Notes
Ensure correct timing alignment before tightening.
6

Variable Timing Control (VTC) Solenoid Bolts

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Ensure proper oil flow. Tighten evenly

2.4l-engine Block

Torque specifications for engine block components.

1

Main Bearing Bolts

M12 x 1.5
Torque Value
29 ft-lbs (39 N·m)
Important Notes
Tighten bolts evenly to ensure proper crankshaft alignment.
2

Oil Pan Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Tighten bolts evenly in a criss-cross pattern to ensure a leak-free seal. Do not overtighten.
3

Timing Belt/Chain Tensioner Bolt

M8 x 1.25
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Proper tension is critical for timing accuracy.
4

Serpentine/Accessory Drive Belt Tensioner Bolt

M8 x 1.25
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Proper torque is crucial for belt tension and component function.
5

Drive Belt Idler Pulley Bolt

M8 x 1.25
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Proper torque is crucial for pulley stability and belt tracking.
6

Water Pump Bolts

M8 x 1.25
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Tighten bolts evenly to ensure a leak-free seal.
7

Water Pump Pulley Bolts

M6 x 1.0
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Tighten evenly to avoid pulley imbalance.
8

Thermostat Housing Bolts

M6 x 1.0
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Tighten evenly to prevent coolant leaks.
9

Oil Filter Housing Bolt

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Tighten to prevent leaks.
10

Oil Drain Plug Bolt

M14 x 1.5
Torque Value
29 ft-lbs (39 N·m)
Important Notes
Use a new crush washer if applicable.

2.4l-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 evenly to avoid leaks. Use a criss-cross pattern.
2

Throttle Body Bolts

M6 x 1.0
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Tighten evenly to prevent leaks. Check for vacuum leaks after installation.
3

EGR Valve Bolts

M6 x 1.0
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Tighten evenly for a proper seal.
4

Fuel Rail Bolts

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

Fuel Injector Bolts

M5 x 0.8
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Do not overtighten to avoid damage to the injector.

2.4l-engine Sensors

Torque specifications for various engine sensors.

1

Knock Sensor Bolt

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Proper torque is crucial for accurate readings.
2

Crankshaft Position Sensor Bolt

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Proper torque is important for accurate signal and sensor function.
3

Camshaft Position Sensor Bolt

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Proper torque is critical for accurate readings.
4

Intake Air Temperature (IAT) Sensor Bolt (If Applicable)

M6 x 1.0
Torque Value
10 ft-lbs (13 N·m)
Important Notes
Tighten to ensure proper sealing and accurate readings. Value is an estimate.
5

Mass Airflow (MAF) Sensor Bolt

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Proper torque is important for accurate readings and proper mounting.
6

Engine Coolant Temperature Sensor Bolt/Threaded Fitting

M12 x 1.25 (If threaded)
Torque Value
15 ft-lbs (20 N·m)
Important Notes
If sensor is threaded directly into the housing, this torque is applied to the sensor itself. Ensure correct seal. Value is an estimate.

2.4l-engine Ignition

Torque specifications for components of the ignition system.

1

Ignition Coil Bolt

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Tighten to prevent coils from coming loose and ensure a good electrical connection.
2

Spark Plugs

M14 x 1.25
Torque Value
13 ft-lbs (17 N·m)
Important Notes
Use a spark plug socket and avoid overtightening.

2.4l-engine Flywheel

Torque specification for the flywheel.

1

Flywheel Bolts

M10 x 1.25
Torque Value
76 ft-lbs (103 N·m)
Important Notes
Always use new bolts if specified by the service manual. Follow the torque sequence specified in the service manual. Some torque specifications require a degree-based tightening.

2.4l-engine Connecting Rods

Torque specifications for connecting rod components.

1

Connecting Rod Nuts

M8 x 1.0
Torque Value
19 ft-lbs (26 N·m)
Important Notes
Tighten nuts evenly to maintain proper bearing clearance.

2.4l-engine Crankshaft Pulley

Torque specifications for the crankshaft pulley/harmonic balancer.

1

Crankshaft Pulley/Harmonic Balancer Bolt

M14 x 1.5
Torque Value
134 ft-lbs (182 N·m)
Important Notes
Proper torque is essential for dampening vibrations and ensuring proper power transfer.

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 so important?

Using the correct torque specification ensures a proper clamping force between components. Under-torquing can lead to loosening, leaks, and component failure, while over-torquing can damage threads, bolts, and the components themselves, causing expensive repairs. For example, over-tightening a cylinder head bolt can warp the head or lead to head gasket failure.

Q2

What type of torque wrench should I use for these specifications?

A calibrated torque wrench is essential. For most bolts on the 2.4L engine, a 3/8" or 1/2" drive torque wrench covering the necessary range is appropriate. For smaller fasteners, a 1/4" drive torque wrench might be needed. Always double-check your wrench's calibration periodically to ensure accuracy. Never use an impact wrench for final torque; always use a hand-operated torque wrench.

Q3

Should I use new bolts when reassembling the engine?

It is highly recommended to use new bolts, especially for critical components like cylinder head bolts, main bearing cap bolts, and connecting rod bolts. These bolts are often torque-to-yield (TTY) and designed for single use. Reusing TTY bolts can lead to incorrect clamping force and component failure. Refer to the Acura service manual for bolt replacement requirements.

Q4

What does 'torque-to-yield' mean?

Torque-to-yield (TTY) bolts are designed to stretch and deform slightly when torqued to a specific specification. This controlled stretching provides an extremely consistent and reliable clamping force, but it also means they should not be reused. They're typically replaced as a standard practice when reassembling critical engine components.

Q5

Can I use threadlocker on these bolts?

Threadlocker, like Loctite, is not typically required for most engine bolts when torquing to specification. However, it may be specified in the service manual for particular bolts. If threadlocker is required, apply it sparingly to the threads and use the correct type specified for the application. When in doubt, consult the Acura service manual for your specific model year.

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 capable of measuring torque in the specified range for engine bolts.

  • Precise torque application
  • Click-type or digital display
  • Wide range of torque settings
Learn more

Torque Wrench (3/8 inch drive)

A smaller torque wrench for use on smaller fasteners with lower torque requirements.

  • Accurate torque application
  • Suitable for lower torque specs
  • Compact design for access
Learn more

Socket Set (Metric)

A complete set of metric sockets, including sizes commonly used on the 2.4L engine.

  • Various socket sizes
  • 6-point or 12-point options
  • Durable construction
Learn more

Socket Extensions

Various lengths of socket extensions to reach fasteners in recessed areas.

  • Provides access in difficult to reach areas
  • Various sizes to accommodate needs
  • Sturdy for safe usage
Learn more

Universal Joint

A universal joint for use in conjunction with socket extensions when torquing fasteners at an angle.

  • Allows torque application at an angle
  • Durable construction
  • Compatible with socket extensions
Learn more
Service Procedures

Cylinder Head Bolt Torque Procedure

Procedure for tightening the cylinder head bolts to the correct torque specification. Follow this sequence carefully.

  • Clean all bolt threads thoroughly before installation
  • Lightly lubricate bolt threads with engine oil unless otherwise specified
  • Install cylinder head bolts and torque in sequence to the first specified torque value.
  • Tighten bolts in sequence by the second torque specification or angle.
  • Verify torque specifications with a manual
View full procedure

Intake Manifold Bolt Torque Procedure

Procedure for tightening the intake manifold bolts to the correct torque specification.

  • Hand-tighten all bolts in place.
  • Torque bolts in sequence to the first specified torque.
  • Verify torque specifications with a manual.
View full procedure

Exhaust Manifold Bolt Torque Procedure

Procedure for tightening the exhaust manifold bolts to the correct torque specification.

  • Hand-tighten all bolts in place.
  • Torque bolts in sequence to the first specified torque.
  • Verify torque specifications with a manual.
View full procedure

Engine Mount Bolt Torque Procedure

Procedure for tightening the engine mount bolts to the correct torque specification.

  • Hand-tighten all engine mount bolts.
  • Tighten the engine mount bolts to the specified torque, alternating sides as required to ensure even tightening.
  • Verify torque specifications with a manual.
View full procedure

Oil Pan Bolt Torque Procedure

Procedure for tightening the oil pan bolts to the correct torque specification.

  • Hand-tighten all bolts in place.
  • Torque bolts in sequence to the first specified torque.
  • Verify torque specifications with a manual.
View full procedure
Technical Service Bulletins

Engine Oil Leak from Timing Cover

2016-03-15

Some 2.4L engines may exhibit an oil leak from the timing cover due to improper bolt torque or sealant failure.

2013-2015 ILX 2.4L

Resolution: Remove the timing cover, clean the mating surfaces, apply new sealant, and torque bolts to the correct specification.

Cylinder Head Bolt Retorque Recommendation

2017-08-22

A small number of 2.4L engines have exhibited slight head gasket leaks due to the head bolts losing initial torque. Retorquing the head bolts may resolve the issue.

2016-2017 ILX 2.4L

Resolution: Retorque the cylinder head bolts to the specified specification using the recommended torque procedure.

Intake Manifold Bolt Loosening Issue

2020-01-10

Certain 2.4L engines are experiencing intake manifold leaks due to bolts loosening over time.

2018-2021 ILX 2.4L

Resolution: Remove intake manifold, clean mating surfaces, replace intake manifold gasket, and torque bolts to specification using recommended torque pattern.

About the Author

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Alan Montanye - Automotive Technical Specialist
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Alan Montanye

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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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