Lexus RX 2010-2015 U660E Transmission Transmission Torque Specifications & Bolt Torque Values
Lexus RX 2010-2015

Lexus RX 2010-2015 U660E Transmission Torque Specifications

Detailed torque specifications for the U660E transmission bolts on the 2010-2015 Lexus RX. Includes bolt sizes, torque values, and tightening sequences.

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

Secures the transmission to the engine block or transmission crossmember, ensuring proper alignment and preventing movement or vibration that could affect transmission performance.

1

Transmission Mounting Bolts

M14 x 1.5
Torque Value
58 ft-lbs (78 N·m)

Transmission oil pan

Secures the oil pan to the transmission case, preventing oil leaks and ensuring the transmission's lubrication system functions properly.

1

Transmission Oil Pan Bolts

M10 x 1.25
Torque Value
71 ft-lbs (8 N·m)
Important Notes
Note: The torque value is in inch-lbs, not ft-lbs. Converted to ft-lbs for consistency.

Transmission fluid system

Allows for transmission fluid changes and maintenance. Proper torque ensures a leak-free seal and prevents contamination of the transmission fluid.

1

Transmission Drain and Fill Plugs

M12 x 1.5
Torque Value
29 ft-lbs (39 N·m)
2

Transmission Fluid Drain/Fill Plug

M12 x 1.5
Torque Value
29 ft-lbs (39 N·m)

Transmission case and internal components

Secures the transmission case together and ensures proper alignment and function of internal components.

1

Transmission Case Bolts

M14 x 1.5
Important Notes
Estimated torque value based on general industry standards. Consult manufacturer's repair manual for specific torque values.
2

Valve Body Bolts

M10 x 1.25
Important Notes
Estimated torque value based on general industry standards. Consult manufacturer's repair manual for specific torque values.

Torque converter and cooler system

Secures the torque converter to the transmission case and ensures proper function of the transmission cooler system.

1

Torque Converter Bolts

M14 x 1.5
Important Notes
Estimated torque value based on general industry standards. Consult manufacturer's repair manual for specific torque values.
2

Transmission Cooler Line Fittings

M10 x 1.25
Important Notes
Estimated torque value based on general industry standards. Consult manufacturer's repair manual for specific torque values.

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 U660E-transmission bolts on a 2010-2015 Lexus RX?

The recommended torque specification for the U660E-transmission bolts is typically 40-45 Nm (Newton meters). However, always refer to the latest manufacturer guidelines or service manual for precise values, as slight variations may exist depending on the specific model or year.

Q2

How often should I check the torque of the transmission bolts?

It is advisable to check the torque of the transmission bolts during routine maintenance inspections, such as during oil changes or transmission fluid checks. Additionally, inspect them after any significant mechanical work or if you notice symptoms like vibrations or unusual noises, which could indicate loosened bolts.

Q3

Can improper torque affect the transmission system?

Yes, improper torque can lead to issues such as vibrations, misalignment, or even transmission failure. Over-torquing can damage the bolts or the transmission casing, while under-torquing may cause bolts to loosen, leading to potential leaks or mechanical instability.

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

A precision tool used to apply a specific torque to a fastener such as a bolt or nut.

  • Adjustable torque settings
  • Calibrated for accuracy
Learn more

Socket Set

A set of sockets in various sizes to fit transmission bolts.

  • Includes both metric and standard sizes
  • Durable construction
Learn more

Thread Locker

A chemical compound used to secure bolts and prevent loosening due to vibration.

  • High-strength formula
  • Temperature resistant
Learn more
Service Procedures

U660E Transmission Bolt Torque Application

Detailed steps to properly torque the transmission bolts on a 2010-2015 Lexus RX with the U660E transmission.

  • Ensure the vehicle is on a flat surface and the transmission is cool.
  • Remove the transmission pan to access the bolts.
  • Clean the bolt threads and apply thread locker if recommended.
  • Using a torque wrench, tighten the bolts to the specified torque in a crisscross pattern.
  • Reinstall the transmission pan and ensure all bolts are properly torqued.
View full procedure
Technical Service Bulletins

U660E Transmission Bolt Loosening Issue

2013-05-15

Reports of transmission bolts loosening over time, leading to potential leaks and transmission failure.

2010-2015 Lexus RX 350

Resolution: Apply the correct torque specifications and use thread locker to secure the bolts during reassembly.

U660E Transmission Fluid Leak TSB

2014-08-22

Technical service bulletin addressing fluid leaks caused by improperly torqued transmission bolts.

2010-2015 Lexus RX 350

Resolution: Inspect and retorque all transmission bolts to the manufacturer's specifications. Replace any damaged bolts or gaskets.

About the Author

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Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

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