Lexus LS 2018-present AWR10 Transmission Transmission Torque Specifications & Bolt Torque Values
Lexus LS 2018-present

Lexus LS 2018-present AWR10 Transmission Torque Specifications

Detailed torque specifications for the AWR10 transmission bolts on the 2018-Present Lexus LS. Includes step-by-step instructions and technical details for proper installation and maintenance.

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

Transmission mounting

This subsystem includes the components that secure the transmission to the engine block or transmission crossmember.

1

Transmission Mounting Bolts

M12 x 1.5
Torque Value
48 ft-lbs (65 N·m)

Transmission oil system

This subsystem includes the components that lubricate the transmission.

1

Transmission Oil Pan Bolts

M8 x 1.25
Torque Value
5.9 ft-lbs (8 N·m)
2

Transmission Drain and Fill Plugs

M14 x 1.5
Torque Value
29 ft-lbs (39 N·m)

Transmission case and bellhousing

This subsystem includes the components that secure the transmission case halves together and the bellhousing to the transmission case and engine block.

1

Transmission Case Bolts

M14 x 1.5
Important Notes
Estimated torque value range. Consult manufacturer's documentation for correct value.
2

Transmission Bellhousing Bolts

M12 x 1.5
Important Notes
Estimated torque value range. Consult manufacturer's documentation for correct value.

Torque converter and propeller/drive shaft

This subsystem includes the components that secure the torque converter to the transmission case and engine crankshaft, and the propeller shaft to the transmission output shaft.

1

Torque Converter Bolts

M10 x 1.25
Important Notes
Estimated torque value range. Consult manufacturer's documentation for correct value.
2

Propeller/Drive Shaft Bolts

M12 x 1.5
Torque Value
48 ft-lbs (65 N·m)

Transmission cooler lines

This subsystem includes the components that secure the transmission cooler lines to the transmission case and radiator.

1

Transmission Cooler Line Fittings

M10 x 1.25
Important Notes
Estimated torque value range. Consult manufacturer's documentation for correct value.

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 is the recommended torque specification for the AWR10-transmission bolts on a 2018-Present Lexus LS?

The recommended torque specification for the AWR10-transmission bolts is 34 Nm (25 ft-lbs) for the smaller bolts and 49 Nm (36 ft-lbs) for the larger bolts. Always refer to the manufacturer's service manual for the most accurate and up-to-date specifications.

Q2

How often should I check the torque on the AWR10-transmission bolts?

It is recommended to check the torque on the AWR10-transmission bolts every 30,000 miles or during routine maintenance intervals. However, if you notice any unusual vibrations, noises, or performance issues, inspect the bolts immediately.

Q3

Can I reuse the transmission bolts after removal?

It is generally not recommended to reuse transmission bolts, as they are designed to stretch during installation to ensure proper clamping force. Reusing them may compromise the integrity of the connection. Always use new bolts when reassembling the transmission.

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

Digital Torque Wrench

A precision tool for applying accurate torque to transmission bolts.

  • Adjustable torque settings
  • Digital display for precise readings
Learn more

Torque Angle Gauge

Used to measure the angle of rotation during torque-to-yield applications.

  • Magnetic base for easy attachment
  • Clear angle markings for accuracy
Learn more

Transmission Jack

A hydraulic jack designed to safely support and position the transmission during service.

  • Adjustable height and tilt
  • Secure locking mechanism
Learn more
Service Procedures

AWR10 Transmission Bolt Torque Application

Detailed steps for applying the correct torque to AWR10 transmission bolts.

  • Ensure the vehicle is on a flat surface and the transmission is properly supported.
  • Clean the bolt threads and mating surfaces to ensure proper torque application.
  • Using a digital torque wrench, tighten the bolts to the specified torque in a crisscross pattern.
  • For torque-to-yield bolts, use a torque angle gauge to achieve the required angle after reaching the initial torque.
  • Double-check all bolts to ensure they meet the manufacturer's specifications.
View full procedure

AWR10 Transmission Removal and Installation

Procedure for safely removing and reinstalling the AWR10 transmission.

  • Disconnect the battery and remove any components obstructing access to the transmission.
  • Use a transmission jack to support the transmission and carefully remove the mounting bolts.
  • Lower the transmission and disconnect all electrical connectors and fluid lines.
  • Install the new or serviced transmission, ensuring all connectors and lines are properly reattached.
  • Reinstall mounting bolts and torque them to the specified values.
View full procedure
Technical Service Bulletins

AWR10 Transmission Bolt Torque Specification Update

2021-05-15

Updated torque specifications for AWR10 transmission bolts to prevent over-tightening.

2018-Present Lexus LS

Resolution: Refer to the latest service manual for updated torque values and ensure all bolts are torqued using the correct procedure.

AWR10 Transmission Fluid Leak TSB

2020-11-10

Technical service bulletin addressing fluid leaks from the AWR10 transmission due to improper bolt torque.

2018-2020 Lexus LS

Resolution: Inspect and retorque all transmission bolts to the updated specifications. Replace any damaged seals or gaskets as necessary.

About the Author

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Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

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