Acura TL 2009-2014 3.7L Engine Bolt Torque Specifications & Fastener Values
Acura TL 2009-2014

Acura TL 2009-2014 3.7L Engine Bolt Torque Specifications

Comprehensive list of torque specifications for various bolts on the 3.7L engine found in the 2009-2014 Acura TL, including cylinder head, crankshaft, 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

3.7l-engine Cylinder Head

Torque specifications for the cylinder head and related components.

1

Cylinder Head Bolts

M12 x 1.25 (Estimated)
Torque Value
23 ft-lbs (31 N·m)
Important Notes
Always use a proper torque sequence as per the service manual. Estimated bolt size; may vary.
2

Valve Cover Bolts

M6 x 1.0 (Estimated)
Torque Value
8.7 ft-lbs (12 N·m)
Important Notes
Tighten bolts evenly to prevent leaks. Estimated bolt size; may vary.
3

Rocker Arms/Shafts Bolts

M6 x 1.0 (Estimated)
Torque Value
8.7 ft-lbs (12 N·m)
Important Notes
Tighten evenly. Estimated bolt size; may vary.
4

Spark Plugs

M14 x 1.25 (Estimated)
Torque Value
13 ft-lbs (17 N·m)
Important Notes
Do not overtighten spark plugs. Estimated bolt size; may vary.
5

Ignition Coil Bolts

M6 x 1.0 (Estimated)
Torque Value
8.7 ft-lbs (12 N·m)
Important Notes
Ensure proper coil seating. Estimated bolt size; may vary.
6

Exhaust Manifold/Headers to Cylinder Head Bolts

M10 x 1.25 (Estimated)
Torque Value
23 ft-lbs (31 N·m)
Important Notes
Always use a proper torque sequence as per the service manual. Estimated bolt size; may vary.

3.7l-engine Block

Torque specifications for engine block components.

1

Main Bearing Bolts

M12 x 1.25 (Estimated)
Torque Value
23 ft-lbs (31 N·m)
Important Notes
Use a specific torque sequence as described in the service manual. Estimated bolt size; may vary.
2

Oil Pan Bolts

M6 x 1.0 (Estimated)
Torque Value
8.7 ft-lbs (12 N·m)
Important Notes
Tighten bolts evenly. Estimated bolt size; may vary.
3

Connecting Rod Nuts

M9 x 1.0 (Estimated)
Torque Value
23 ft-lbs (31 N·m)
Important Notes
Tighten connecting rod nuts evenly. Estimated bolt size; may vary.
4

Oil Filter Housing Bolts

M6 x 1.0 (Estimated)
Torque Value
8.7 ft-lbs (12 N·m)
Important Notes
Tighten bolts evenly. Estimated bolt size; may vary.
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 when installing. Estimated bolt size; may vary.

3.7l-engine Timing System

Torque specifications for the timing belt/chain system components.

1

Timing Belt/Chain Tensioner Bolt

M8 x 1.25 (Estimated)
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Ensure proper tensioner operation. Estimated bolt size; may vary.
2

Camshaft Sprocket Bolt

M10 x 1.25 (Estimated)
Torque Value
94 ft-lbs (127 N·m)
Important Notes
Ensure correct camshaft timing. Estimated bolt size; may vary.
3

Variable Timing Control (VTC) Solenoid Bolt

M6 x 1.0 (Estimated)
Torque Value
8.7 ft-lbs (12 N·m)
Important Notes
Ensure proper VTC solenoid seating. Estimated bolt size; may vary.

3.7l-engine Intake System

Torque specifications for the intake system components.

1

Intake Manifold Bolts

M8 x 1.25 (Estimated)
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Use proper torque sequence to prevent leaks. Estimated bolt size; may vary.
2

Intake Manifold Support Bracket Bolt

M8 x 1.25 (Estimated)
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Tighten the support bracket securely. Estimated bolt size; may vary.
3

Throttle Body Bolts

M6 x 1.0 (Estimated)
Torque Value
8.7 ft-lbs (12 N·m)
Important Notes
Tighten evenly to prevent vacuum leaks. Estimated bolt size; may vary.
4

Fuel Rail Bolts

M6 x 1.0 (Estimated)
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Do not overtighten, and ensure proper fuel rail seating. Estimated bolt size; may vary.
5

Fuel Injector Bolts

M6 x 1.0 (Estimated)
Torque Value
8.7 ft-lbs (12 N·m)
Important Notes
Ensure proper fuel injector seating. Estimated bolt size; may vary.
6

EGR Valve Bolts

M8 x 1.25 (Estimated)
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Ensure proper EGR valve seating. Estimated bolt size; may vary.

3.7l-engine Cooling System

Torque specifications for cooling system components.

1

Water Pump Bolts

M8 x 1.25 (Estimated)
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Use a new gasket. Estimated bolt size; may vary.
2

Water Pump Pulley Bolts

M8 x 1.25 (Estimated)
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Tighten bolts evenly. Estimated bolt size; may vary.
3

Thermostat Housing Bolts

M8 x 1.25 (Estimated)
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Use a new gasket. Estimated bolt size; may vary.
4

Coolant Temperature Sensor/Sending Unit

M10 x 1.0 (Estimated)
Torque Value
11 ft-lbs (15 N·m)
Important Notes
Do not overtighten, can damage the sensor, torque to hand tight. Estimated bolt size; may vary.

3.7l-engine External Components

Torque specifications for external engine components.

1

Crankshaft Pulley/Harmonic Balancer Bolt

M14 x 1.5 (Estimated)
Torque Value
181 ft-lbs (245 N·m)
Important Notes
This bolt requires very high torque. Estimated bolt size; may vary.
2

Serpentine/Accessory Drive Belt Tensioner Bolt

M10 x 1.25 (Estimated)
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Ensure correct tensioner operation. Estimated bolt size; may vary.
3

Drive Belt Idler Pulley Bolt

M10 x 1.25 (Estimated)
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Ensure proper pulley alignment. Estimated bolt size; may vary.
4

Flywheel Bolts

M10 x 1.25 (Estimated)
Torque Value
94 ft-lbs (127 N·m)
Important Notes
Use proper torque sequence. Estimated bolt size; may vary.
5

Crankshaft Sensor Bolt

M6 x 1.0 (Estimated)
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Ensure sensor is properly seated. Estimated bolt size; may vary.
6

Camshaft Position Sensor Bolt

M6 x 1.0 (Estimated)
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Ensure sensor is properly seated. Estimated bolt size; may vary.
7

Knock Sensor Bolt

M8 x 1.25 (Estimated)
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Ensure sensor is properly seated. Estimated bolt size; may vary.
8

Engine Grounding Bolt Torques

M8 x 1.25 (Estimated)
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Ensure proper grounding connection. Estimated bolt size; may vary.
9

Oil Pressure Switch/Sensor

M10 x 1.0 (Estimated)
Torque Value
11 ft-lbs (15 N·m)
Important Notes
Do not overtighten, can damage sensor. Estimated bolt size; may vary.
10

Fuel Filter Bolt/Nut

M8 x 1.25 (Estimated)
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Ensure leak-free connection. Estimated bolt size; may vary.

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 for proper component clamping force. Over-tightening can damage threads, stretch bolts, and deform gaskets, leading to leaks and component failure. Under-tightening can cause parts to loosen under vibration or stress, also resulting in failure. For example, over-torquing a cylinder head bolt can warp the head, while under-torquing can cause a blown head gasket.

Q2

What type of torque wrench should I use?

A calibrated torque wrench, either click-type or digital, is essential for accurate torque application. Avoid using non-calibrated wrenches or relying on 'feel'. Click-type wrenches are common and provide an audible click when the set torque is reached. Digital wrenches offer more precise readings. Always verify calibration regularly per the manufacturer's recommendation. Consider a 1/2 inch drive for larger bolts like the crank pulley and a 3/8 inch drive for smaller bolts.

Q3

Do I need to use new bolts every time I disassemble engine components?

For critical components, such as connecting rod bolts and cylinder head bolts, new bolts are often required. These bolts are designed to stretch upon proper torque, and reusing them can lead to improper clamping and potentially catastrophic engine damage. Always consult the service manual for specific recommendations regarding bolt replacement for the 3.7L engine.

Q4

What should I do if a bolt breaks during tightening?

If a bolt breaks during tightening, stop immediately. Remove the broken bolt using appropriate tools, like an extractor. Inspect the threads for damage and repair if necessary. Replace the broken bolt with a new one of the exact specification and re-torque correctly. Avoid attempting to weld it, as it may have hidden stresses and weakened areas.

Q5

What is the proper sequence for tightening bolts, especially for cylinder heads?

Following the correct tightening sequence is crucial for uniform clamping force across components. Cylinder heads, for example, typically require a specific sequence, often a spiral pattern from the center outwards. The sequence prevents warping and ensures even pressure on the gasket. Consult the specific service manual for the 3.7L engine for the correct pattern and any required pre-torquing or angle-tightening steps.

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 capable of measuring torque values from 10 ft-lbs to 150 ft-lbs.

  • Accurate torque measurement
  • Click-type or digital readout
Learn more

Torque Wrench (3/8 inch drive)

A 3/8 inch drive torque wrench capable of measuring torque values from 5 ft-lbs to 80 ft-lbs.

  • Accurate torque measurement
  • Click-type or digital readout
Learn more

Socket Set (Standard & Metric)

A comprehensive socket set containing standard and metric sockets with 1/2 inch and 3/8 inch drives.

  • Variety of sizes
  • 6-point design for secure grip
Learn more

Socket Extensions

Various lengths of socket extensions to reach recessed bolts.

  • 3/8 inch and 1/2 inch drive
  • Durable steel construction
Learn more

Universal Joint

A universal joint for sockets to access bolts at angles.

  • 3/8 inch and 1/2 inch drive
  • Durable steel construction
Learn more

Torque Angle Meter (optional)

An angle meter for accurate measurement of torque-to-yield bolts.

  • Precise angle measurement
  • Digital or mechanical options
Learn more
Service Procedures

Cylinder Head Bolt Tightening Procedure

Procedure for correctly tightening the cylinder head bolts on the 3.7L engine.

  • 1. Lightly lubricate bolt threads with engine oil.
  • 2. Install bolts and tighten in the correct sequence to 29 ft-lbs.
  • 3. Tighten all bolts in the same sequence an additional 90 degrees using a torque angle meter (or markings).
  • 4. Tighten all bolts in the same sequence an additional 90 degrees using a torque angle meter (or markings).
View full procedure

Intake Manifold Bolt Tightening Procedure

Procedure for correctly tightening the intake manifold bolts on the 3.7L engine.

  • 1. Install all bolts finger tight.
  • 2. Tighten bolts in the specified sequence to 16 ft-lbs
View full procedure

Rocker Arm Shaft Bolt Tightening Procedure

Procedure for correctly tightening the rocker arm shaft bolts on the 3.7L engine.

  • 1. Install bolts and tighten to 16 ft-lbs.
  • 2. Tighten bolts an additional 90 degrees using a torque angle meter (or markings).
View full procedure

Connecting Rod Cap Bolt Tightening Procedure

Procedure for correctly tightening the connecting rod cap bolts on the 3.7L engine.

  • 1. Lightly lubricate bolt threads with engine oil.
  • 2. Install bolts and tighten to 22 ft-lbs.
  • 3. Tighten all bolts an additional 60 degrees using a torque angle meter (or markings).
View full procedure

Oil Pan Bolt Tightening Procedure

Procedure for correctly tightening the oil pan bolts on the 3.7L engine.

  • 1. Install all bolts finger tight.
  • 2. Tighten bolts in the specified sequence to 10 ft-lbs
View full procedure

Water Pump Bolt Tightening Procedure

Procedure for correctly tightening the water pump bolts on the 3.7L engine.

  • 1. Install all bolts finger tight.
  • 2. Tighten bolts in the specified sequence to 16 ft-lbs
View full procedure

Crankshaft Pulley Bolt Tightening Procedure

Procedure for correctly tightening the crankshaft pulley bolt on the 3.7L engine.

  • 1. Lightly lubricate bolt threads with engine oil.
  • 2. Tighten bolt to 47 ft-lbs.
  • 3. Tighten the bolt an additional 90 degrees using a torque angle meter (or markings).
View full procedure
Technical Service Bulletins

Excessive Oil Consumption - Piston Ring Issue

2012-06-15

Some 2009-2012 Acura TL 3.7L engines may experience excessive oil consumption due to a piston ring issue. This can affect proper torque application during engine reassembly after repairs.

2009-2012 Acura TL (3.7L)

Resolution: Inspect piston rings for wear/damage. Replace as necessary. Ensure proper cylinder bore preparation, ring seating procedures and adhere to accurate torque specifications when reassembling.

Cylinder Head Bolt Stretch - Re-use Advisory

2010-03-22

Technical bulletin regarding the proper use and replacement of cylinder head bolts on the 3.7L Acura TL engine. The bulletin advises that these bolts are torque-to-yield and are not to be reused.

2009-2014 Acura TL (3.7L)

Resolution: Always replace cylinder head bolts with new ones when disassembling the cylinder head. Reusing the bolts will result in improper torque and engine damage.

Timing Cover Bolt Overtightening Risk

2013-01-10

Overtightening of the timing cover bolts on the 3.7L Acura TL engine can lead to damage and oil leaks. Use a torque wrench and ensure accurate torque values as recommended.

2009-2014 Acura TL (3.7L)

Resolution: Follow torque specifications carefully when installing the timing cover. Use a properly calibrated torque wrench and verify torque values multiple times throughout tightening sequence.

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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