Acura TLX 2015-2020 Drivetrain Bolt Torque Specifications & Fastener Values
Acura TLX 2015-2020

Acura TLX 2015-2020 Drivetrain Bolt Torque Specifications

This page provides detailed torque specifications for various bolts within the drivetrain system of the 2015-2020 Acura TLX. Includes specifications for the transmission, differential, axles, and related components.

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

Engine Flywheel

Torque specifications for the flywheel and related components.

1

Flywheel Bolts

M10 x 1.25
Torque Value
76 ft-lbs (103 N·m)
Important Notes
Tighten bolts in a star pattern. Lubricate bolt threads with engine oil prior to installation.
2

Torque Converter Bolts

M8 x 1.25
Torque Value
35 ft-lbs (47 N·m)
Important Notes
Tighten bolts in a star pattern. Estimated value based on similar applications. Ensure correct torque is achieved to prevent vibration and damage.

Transmission

Torque specifications for the transmission and related components.

1

Transmission Mounting Bolts

M12 x 1.75
Torque Value
47 ft-lbs (64 N·m)
Important Notes
Ensure proper alignment of the transmission before tightening. This torque specification MAY include bellhousing bolts, further clarification is required.
2

Transmission Oil Pan Bolts

M6 x 1.0
Torque Value
6 ft-lbs (8 N·m)
Important Notes
Tighten bolts in a cross pattern. Use a new gasket or sealant to ensure a leak-proof seal. Convert in-lbs to ft-lbs by dividing by 12 (71 in-lbs = ~6 ft-lbs).
3

Transmission Drain and Fill Plugs

M18 x 1.5
Torque Value
36 ft-lbs (49 N·m)
Important Notes
Use new sealing washers if applicable. Ensure threads are clean before installation.

Drive Axles

Torque specifications for drive axles (half shafts) and related components.

1

Drive Axle/Half Shaft Bolts

M10 x 1.5
Torque Value
47 ft-lbs (64 N·m)
Important Notes
These bolts connect the drive axles to the transmission or differential output flange. Verify if these are the output shaft flange bolts and do not include the wheel hub flange.
2

CV Joint/Axle Nut

M24 x 1.5
Torque Value
177 ft-lbs (240 N·m)
Important Notes
Use new nut. Ensure proper engagement and seating of the CV joint to the wheel hub before tightening. Always reference the manufacturer's specific service information to ensure proper procedure.
3

Output Shaft Flange Bolts

M10 x 1.5
Torque Value
47 ft-lbs (64 N·m)
Important Notes
These bolts connect the drive axles to the transmission or differential's output shaft. This value may be the same as the drive axle/half shaft bolts - verify the exact application.

Driveshaft And Differential

Torque specifications for driveshaft (propeller shaft), differential, and related components.

1

Propeller/Drive Shaft Bolts

M10 x 1.5
Torque Value
47 ft-lbs (64 N·m)
Important Notes
These bolts are responsible for fastening the driveshaft to the transmission and the differential. Verify that these are not differential mounting bolts.
2

Differential Drain/Fill Plugs

M18 x 1.5
Torque Value
36 ft-lbs (49 N·m)
Important Notes
Use new sealing washers if applicable. Ensure threads are clean before installation.
3

Differential Mounting Bolts

M12 x 1.75
Torque Value
47 ft-lbs (64 N·m)
Important Notes
Estimated value, if not the same as the propeller/drive shaft bolts. Use new bolts if required.

Transfer Case

Torque specifications for the transfer case and related components, applicable for AWD models.

1

Transfer Case Drain/Fill Plugs

M18 x 1.5
Torque Value
36 ft-lbs (49 N·m)
Important Notes
Use new sealing washers if applicable. Ensure threads are clean before installation.

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 for drivetrain bolts?

Using the correct torque specifications ensures that bolts are tightened to the optimal tension. Under-tightening can lead to components loosening, causing vibrations, premature wear, and potentially component failure. Over-tightening can stretch or damage bolts, potentially causing them to break, strip threads in the component or the fastener, or deform the parts being fastened, also leading to failure. For example, over-tightening an axle nut might cause damage to the wheel bearing. Correct torque provides a safe and reliable assembly.

Q2

What type of lubricant should I use on drivetrain bolts?

Generally, it's best to follow the manufacturer's recommendations. Most drivetrain bolts don't require special lubrication beyond the factory coating. However, some bolts, such as those used in the exhaust system or in certain subframe applications, might benefit from anti-seize lubricant, especially in areas prone to corrosion or high temperatures. Always consult your service manual for specific recommendations for each component. Using the wrong lubricant or applying it where it's not needed can affect the actual clamping force of the bolt.

Q3

How often should I check the torque on my drivetrain bolts?

Drivetrain bolts generally do not need to be checked frequently unless there is a specific issue. However, after performing any work on drivetrain components, it's a good practice to double-check all torqued fasteners after a short drive, such as around 50-100 miles and again at 500 miles. If you notice unusual noises, vibrations, or leaks, it's essential to check the relevant bolts immediately. For example, if you changed a CV axle, checking the axle nut and associated fasteners after the initial drive is crucial.

Q4

Can I use an impact wrench to tighten drivetrain bolts?

It is strongly discouraged to use an impact wrench for final tightening of drivetrain bolts. Impact wrenches lack the precise control needed to achieve accurate torque specifications and can easily over-tighten bolts, leading to damage. An impact wrench can be used for initial tightening, but a calibrated torque wrench should always be used for final tightening to ensure proper clamping force.

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 fasteners to the manufacturer's specifications. 1/2 inch drive is recommended for most drivetrain components.

  • Wide torque range
  • Audible click when torque is reached
  • High accuracy
Learn more

Torque Wrench (3/8 inch drive)

A calibrated torque wrench with 3/8 inch drive is beneficial for smaller bolts and fasteners within the drivetrain assembly where the 1/2 inch may be too large.

  • Smaller head for tight spaces
  • Good accuracy for lower torque settings
  • Audible click when torque is reached
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets in various sizes is required to fit all drivetrain bolt heads.

  • Wide range of sizes
  • Durable construction
  • 6-point design
Learn more

Extension Bars

Extension bars allow access to recessed or hard-to-reach fasteners.

  • Various lengths
  • Durable construction
  • Secure connection to sockets
Learn more

Universal Joint

Allows sockets to be used at an angle when straight access is not possible.

  • Durable construction
  • Smooth swivel action
  • Secure connection to sockets
Learn more
Service Procedures

Driveshaft Bolt Torque Procedure

This procedure outlines the steps for properly torquing the driveshaft bolts on an Acura TLX. Always refer to the specific torque spec for your vehicle's drivetrain and model year.

  • Clean the threads of the bolt and the threaded hole with a wire brush.
  • Apply a small amount of anti-seize lubricant to the threads of the bolt.
  • Install the bolt by hand, making sure it is not cross threaded.
  • Using the appropriate size socket and torque wrench, tighten the bolts to the first stage torque specification as outlined by the factory manual.
  • Tighten the bolts to the second stage final torque specification, in a criss-cross pattern.
  • Ensure all bolts are properly torqued by double-checking the final torque spec with the torque wrench.
View full procedure

Differential Mount Bolt Torque Procedure

This procedure outlines the steps for properly torquing the differential mount bolts. Note that tightening sequence may be important.

  • Clean the threads of the bolt and the threaded hole with a wire brush.
  • Install the bolts by hand, making sure they are not cross-threaded.
  • Using the appropriate size socket and torque wrench, tighten the bolts to the first stage torque specification as outlined by the factory manual.
  • Tighten the bolts to the second stage final torque specification, following the tightening sequence specified by the factory manual.
  • Ensure all bolts are properly torqued by double-checking the final torque spec with the torque wrench.
View full procedure

Wheel Bearing/Hub Bolt Torque Procedure

This procedure outlines the steps for properly torquing the wheel bearing/hub bolts.

  • Clean the threads of the bolt and the threaded hole with a wire brush.
  • Install the bolts by hand, making sure they are not cross-threaded.
  • Using the appropriate size socket and torque wrench, tighten the bolts to the first stage torque specification as outlined by the factory manual.
  • Tighten the bolts to the second stage final torque specification, using a criss-cross pattern
  • Ensure all bolts are properly torqued by double-checking the final torque spec with the torque wrench.
View full procedure
Technical Service Bulletins

Driveshaft Bolt Loosening Issue

2017-05-15

Some 2015-2017 TLX models have reported driveshaft bolt loosening due to insufficient torque from the factory or a faulty batch of bolts. This can lead to unusual drivetrain noises or vibrations.

2015-2017

Resolution: Inspect driveshaft bolts for proper torque. If bolts are found loose or damaged, replace with new bolts following the updated torque specifications in the service manual.

Differential Mount Bolt Failure

2019-11-20

Premature differential mount bolt failure was reported in 2018-2019 TLX models. This is typically due to improper torque applied at the factory or excessive stress on the mounts. This can result in a clunking noise coming from the rear of the vehicle.

2018-2019

Resolution: Inspect differential mount bolts for cracks and damage. If bolts are found loose, damaged or broken, replace with new bolts to the updated torque specification in the service manual.

About the Author

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Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

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