Acura TL 2009-2014 3.5L Engine Bolt Torque Specifications & Fastener Values
Acura TL 2009-2014

Acura TL 2009-2014 3.5L Engine Bolt Torque Specifications

Detailed torque specifications for various bolts on the 3.5L engine of the 2009-2014 Acura TL, including cylinder head, main bearing cap, connecting rod, and other critical fasteners.

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

3.5l-engine Cylinder Head

Torque specifications for the cylinder head and related components.

1

Cylinder Head Bolts

M10 x 1.25
Torque Value
23 ft-lbs (31 N·m)
Important Notes
Tighten in a specific sequence. Refer to the service manual for the correct pattern and stages. This torque value is for the initial torque pass.
2

Valve Cover Bolts

M6 x 1.0
Torque Value
8.7 ft-lbs (12 N·m)
Important Notes
Tighten in a crisscross pattern to ensure even sealing.
3

Rocker Arms/Shafts Bolts

M6 x 1.0
Torque Value
8.7 ft-lbs (12 N·m)
Important Notes
Tighten evenly to ensure correct valve operation.
4

Camshaft Position Sensor Bolt

M6 x 1.0
Torque Value
8.7 ft-lbs (12 N·m)
Important Notes
Torque to ensure good sensor reading.
5

Ignition Coil Bolts

M6 x 1.0
Torque Value
8.7 ft-lbs (12 N·m)
Important Notes
Ensure coils are secured properly and prevent electrical shorts.
6

Spark Plugs

M14 x 1.25
Torque Value
13 ft-lbs (17 N·m)
Important Notes
Torque is critical for proper seal and heat transfer.

3.5l-engine Block

Torque specifications for engine block components.

1

Main Bearing Bolts

M10 x 1.25
Torque Value
23 ft-lbs (31 N·m)
Important Notes
Tighten in a specific sequence. Refer to the service manual for correct pattern and stages. Lubricate bolt threads with engine oil prior to assembly. This torque value is for the initial torque pass.
2

Oil Pan Bolts

M6 x 1.0
Torque Value
8.7 ft-lbs (12 N·m)
Important Notes
Tighten in a crisscross pattern to ensure even sealing and prevent oil leaks.
3

Oil Filter Housing Bolt

M6 x 1.0
Torque Value
8.7 ft-lbs (12 N·m)
Important Notes
Proper torque to ensure a leak-free seal.
4

Crankshaft Position Sensor Bolt

M6 x 1.0
Torque Value
8.7 ft-lbs (12 N·m)
Important Notes
Torque to ensure good sensor reading.
5

Coolant Temperature Sensor Bolt

M6 x 1.0
Torque Value
8.7 ft-lbs (12 N·m)
Important Notes
Torque to ensure good sensor reading.
6

Water Pump Bolts

M8 x 1.25
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Tighten to ensure proper seal and prevent coolant leaks.
7

Thermostat Housing Bolts

M8 x 1.25
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Tighten to ensure proper thermostat function and prevent coolant leaks.
8

Knock Sensor Bolt

M8 x 1.25
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Torque to ensure proper sensor operation.
9

Oil Drain Plug Bolt

M14 x 1.5
Torque Value
29 ft-lbs (39 N·m)
Important Notes
Use a new sealing washer and torque to prevent oil leaks.
10

Coolant Drain Plug (Engine Block)

M12 x 1.5
Torque Value
13 ft-lbs (18 N·m)
Important Notes
Hand tighten to prevent cracking of the block. Estimated value.

3.5l-engine Internal

Torque specifications for internal engine components.

1

Connecting Rod Nuts

M9 x 1.0
Torque Value
23 ft-lbs (31 N·m)
Important Notes
Tighten in a specific sequence. Refer to the service manual for the correct pattern and stages. Lubricate bolt threads with engine oil prior to assembly. This torque value is for the initial torque pass.
2

Flywheel Bolts

M10 x 1.25
Torque Value
94 ft-lbs (127 N·m)
Important Notes
Tighten in a star pattern to ensure even clamping.
3

Camshaft Sprocket Bolt

M12 x 1.25
Torque Value
94 ft-lbs (127 N·m)
Important Notes
Proper torque ensures correct timing and prevents slippage.
4

Variable Timing Control (VTC) Actuator Bolts

M8 x 1.25
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Precise torque is crucial for proper VTC function.
5

Timing Belt/Chain Tensioner Bolt

M8 x 1.25
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Correct torque is essential for maintaining proper tension on the timing system.

3.5l-engine Intake

Torque specifications for intake manifold and related components.

1

Intake Manifold Bolts

M8 x 1.25
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Tighten in a crisscross pattern to ensure even sealing.
2

Throttle Body Bolts

M6 x 1.0
Torque Value
8.7 ft-lbs (12 N·m)
Important Notes
Proper torque is needed for an air tight seal.
3

EGR Valve Bolts

M6 x 1.0
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Tighten to prevent leaks in the EGR system.
4

Fuel Rail Bolts

M6 x 1.0
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Tighten to ensure fuel pressure is maintained.
5

Fuel Injector Bolts

M6 x 1.0
Torque Value
8.7 ft-lbs (12 N·m)
Important Notes
Proper torque ensures proper fuel pressure and delivery.

3.5l-engine Exhaust

Torque specifications for exhaust components.

1

Exhaust Manifold/Headers Bolts

M8 x 1.25
Torque Value
23 ft-lbs (31 N·m)
Important Notes
Tighten to create a gas-tight seal and prevent exhaust leaks.

3.5l-engine Accessories

Torque specifications for engine accessories.

1

Crankshaft Pulley/Harmonic Balancer Bolt

M16 x 1.5
Torque Value
181 ft-lbs (245 N·m)
Important Notes
This is a high-torque bolt. Ensure proper installation and torque to prevent vibrations.
2

Water Pump Pulley Bolts

M6 x 1.0
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Ensure the pulley is correctly mounted for proper drive belt function.
3

Oil Filter Cap

N/A
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Hand tight. Overtightening can damage the cap. Estimated value.
4

VTEC Solenoid Bolts

M6 x 1.0
Torque Value
8.7 ft-lbs (12 N·m)
Important Notes
Proper torque ensures oil sealing and VTEC operation.
5

Engine Mount Bolts (Engine Block Side)

M10 x 1.5
Torque Value
60 ft-lbs (81 N·m)
Important Notes
Estimated general range, actual torque varies by mount. Check service manual for specific values and locations. This value represents an average.

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 over-torque a bolt on my Acura TL's 3.5L engine?

Over-torquing a bolt can stretch or break it, damage the threads in the engine block or component, and potentially cause leaks or component failure. For example, over-torquing cylinder head bolts can lead to head gasket failure, requiring extensive repairs. Always use a calibrated torque wrench and follow the specified torque values.

Q2

Can I reuse torque-to-yield (TTY) bolts on my 3.5L Acura TL engine?

No, torque-to-yield (TTY) bolts, which are often used for critical components like cylinder heads and connecting rods, must be replaced every time they are removed. These bolts are designed to stretch when tightened and are not reusable. Reusing TTY bolts can lead to improper clamping force and serious engine damage. Always refer to the Acura service manual for identification and replacement guidelines.

Q3

Why are torque specifications different for various bolts on my 3.5L engine?

Torque specifications are carefully determined based on the size, material, and function of each bolt and the parts they join. Different bolts experience different levels of stress and clamping requirements. For instance, the smaller bolts securing the valve cover require less torque than the larger bolts securing the intake manifold or engine mounts. Applying the correct torque for each bolt ensures proper sealing and prevents damage.

Q4

How often should I check the torque on critical engine components?

While not a regular maintenance item under normal conditions, it's good practice to recheck the torque on critical fasteners, especially after any major engine work (e.g., timing belt replacement, head gasket work). Check the manufacturer's service manual for specific recommendations. If the vehicle operates under severe conditions or has been modified, more frequent inspections may be warranted. For most components, rechecking is done after the initial install and following a brief running period.

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 1/2" drive torque wrench capable of measuring torque values from 10 ft-lbs to 150 ft-lbs (or equivalent in Nm).

  • Accurate torque measurement
  • Audible click when reaching set torque
Learn more

Torque Wrench (3/8" Drive)

A 3/8" drive torque wrench capable of measuring torque values from 5 ft-lbs to 80 ft-lbs (or equivalent in Nm).

  • Accurate torque measurement
  • Audible click when reaching set torque
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets (typically 8mm to 19mm) in both 3/8" and 1/2" drive sizes to fit various engine bolts.

  • Various socket sizes
  • Durable construction
Learn more

Extension Bars

Various length extension bars in 3/8" and 1/2" drive sizes to reach recessed or hard to reach engine bolts.

  • Provides added reach
  • Secure socket connection
Learn more

Universal Joint

A universal joint in 3/8" and 1/2" drive sizes to allow for angled access to engine bolts.

  • Allows for angled socket access
  • Secure socket connection
Learn more
Service Procedures

Cylinder Head Bolt Torque Procedure (3.5L)

Procedure for tightening the cylinder head bolts on the 3.5L V6 engine.

  • Clean the threads of all bolts and in the engine block.
  • Install all bolts finger-tight.
  • Tighten all cylinder head bolts in the correct sequence to 29 ft-lbs (40 Nm).
  • Tighten all cylinder head bolts an additional 90 degrees in the correct sequence.
  • Tighten all cylinder head bolts an additional 90 degrees in the correct sequence.
  • Check all bolts for proper torque.
View full procedure

Intake Manifold Bolt Torque Procedure (3.5L)

Procedure for tightening the intake manifold bolts on the 3.5L V6 engine.

  • Install all bolts finger-tight.
  • Tighten all intake manifold bolts in the correct sequence to 16 ft-lbs (22 Nm).
  • Check all bolts for proper torque.
View full procedure

Valve Cover Bolt Torque Procedure (3.5L)

Procedure for tightening the valve cover bolts on the 3.5L V6 engine.

  • Install all bolts finger-tight.
  • Tighten all valve cover bolts in the correct sequence to 9 ft-lbs (12 Nm).
  • Check all bolts for proper torque.
View full procedure

Oil Pan Bolt Torque Procedure (3.5L)

Procedure for tightening the oil pan bolts on the 3.5L V6 engine.

  • Install all bolts finger-tight.
  • Tighten all oil pan bolts to 9 ft-lbs (12 Nm).
  • Check all bolts for proper torque.
View full procedure

Connecting Rod Bolt Torque Procedure (3.5L)

Procedure for tightening the connecting rod bolts on the 3.5L V6 engine.

  • Clean the threads of all bolts and in the connecting rod.
  • Install all bolts finger-tight.
  • Tighten all connecting rod bolts to 15 ft-lbs (20 Nm).
  • Tighten all connecting rod bolts an additional 60 degrees.
  • Check all bolts for proper torque.
View full procedure

Main Bearing Cap Bolt Torque Procedure (3.5L)

Procedure for tightening the main bearing cap bolts on the 3.5L V6 engine.

  • Clean the threads of all bolts and in the engine block.
  • Install all bolts finger-tight.
  • Tighten all main bearing cap bolts in the correct sequence to 22 ft-lbs (30 Nm).
  • Tighten all main bearing cap bolts an additional 75 degrees.
  • Check all bolts for proper torque.
View full procedure
Technical Service Bulletins

Engine Oil Leak from Valve Cover

2012-05-15

Some 2009-2014 Acura TL models may experience oil leaks from the valve cover due to improper torque or gasket failure.

2009-2014

Resolution: Inspect the valve cover gasket for damage, replace if necessary. Ensure proper torque of 9 ft-lbs (12 Nm) for all valve cover bolts following the correct tightening sequence.

Excessive Engine Noise

2013-09-20

Some 2009-2014 Acura TL models with the 3.5L engine may experience excessive engine noise due to loose intake manifold bolts.

2009-2014

Resolution: Verify torque specifications of 16 ft-lbs (22 Nm) for intake manifold bolts, following proper torque sequence.

About the Author

Expert automotive knowledge and experience

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.

Facebook Contact
15+ Years
Experience
500+ Guides
Guides
50+ Makes
Vehicles
1000+ Solutions
Solutions

Diagnostic

Specialized in advanced diagnostic techniques using modern scan tools and oscilloscopes.

Repair

Expert in both traditional mechanical repairs and modern vehicle systems.

Additional Expertise

Documentation

Created over 500 detailed repair guides and technical documents.

Training

Conducted technical training sessions and contributed to repair databases.

Certifications & Research

Certifications

  • ASE Master Technician Certification
  • Advanced Diagnostic Specialist
  • Hybrid/Electric Vehicle Systems
  • Performance Tuning Expert

Research & Community

Actively researches emerging technologies and contributes to automotive forums.

Legal Disclaimer

Important information about using this content

Always refer to your vehicle's service manual and take appropriate safety precautions when performing any maintenance or repairs.

General Information
The information provided on this website is for general informational purposes only. While we strive to maintain accuracy in our content, all specifications, procedures, and technical information should be verified against your vehicle's official service manual or with the manufacturer directly.
Warranty & Liability

The content on this website is provided "as is" without any representations or warranties, express or implied. We make no representations or warranties regarding the accuracy, completeness, or availability of the information.

We shall not be liable for any direct, indirect, special, or consequential damages arising from the use of information on this website.

Technical Information
  • All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
  • Vehicle specifications and procedures may vary by model year, trim level, and region.
  • Always follow the manufacturer's recommended procedures and safety precautions.
  • Working on vehicles can be dangerous. Always take proper safety precautions and use appropriate safety equipment.
  • If you're unsure about any procedure, consult a qualified professional mechanic.
Intellectual Property
All content, including text, images, and specifications, is protected by copyright and other intellectual property laws. Any unauthorized use or reproduction is prohibited.

© 2025 Acura Specs. All rights reserved.

Privacy Policy Terms of Service