Lexus UX 2019-present K120 Transmission Transmission Torque Specifications & Bolt Torque Values
Lexus UX 2019-present

Lexus UX 2019-present K120 Transmission Torque Specifications

Detailed torque specifications for the K120 transmission bolts on the 2019-Present Lexus UX. Includes step-by-step instructions and technical details.

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

These bolts secure the transmission to the engine block or transmission crossmember, ensuring proper alignment and preventing movement that could cause damage to the transmission or surrounding components.

1

Transmission Mounting Bolts

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

Transmission Oil Pan

These bolts secure the oil pan to the transmission case, preventing oil leaks and ensuring the transmission is properly lubricated.

1

Transmission Oil Pan Bolts

M8 x 1.25
Torque Value
5 ft-lbs (8 N·m)
Important Notes
Estimated bolt size and torque value based on similar components.

Transmission Drain And Fill

These plugs allow for the draining and filling of transmission fluid, and proper torque ensures a secure seal to prevent leaks.

1

Transmission Drain and Fill Plugs

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

Transmission Case

These bolts secure the transmission case together, ensuring the internal components are properly aligned and secured.

1

K120 Transmission Case Bolts

M14 x 1.5
Torque Value
65 ft-lbs (88 N·m)
Important Notes
Estimated bolt size based on industry standards for similar transmission cases.

Transmission Valve Body

These bolts secure the valve body to the transmission case, ensuring proper hydraulic pressure and flow.

1

K120 Transmission Valve Body Bolts

M10 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Estimated bolt size based on industry standards for similar valve bodies.

Transmission Filter

These bolts secure the transmission filter to the transmission case, ensuring proper filtration and preventing contamination.

1

K120 Transmission Filter Bolts

M8 x 1.25
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Estimated bolt size based on industry standards for similar transmission filters.

Transmission Cooler Lines

These fittings secure the transmission cooler lines to the transmission case, ensuring proper cooling and preventing leaks.

1

K120 Transmission Cooler Line Fittings

M10 x 1.25
Torque Value
13 ft-lbs (18 N·m)
Important Notes
Estimated bolt size based on industry standards for similar cooler line fittings.

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 K120-transmission bolts on a 2019-Present Lexus UX?

The recommended torque specification for the K120-transmission bolts is 34 Nm (25 ft-lbs) for the transmission housing bolts and 49 Nm (36 ft-lbs) for the bell housing 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 K120-transmission bolts?

It is recommended to check the torque on the K120-transmission bolts during routine maintenance intervals, such as every 30,000 miles or if you notice any unusual vibrations or noises. Additionally, recheck the torque after any transmission-related repairs or component replacements.

Q3

Can I reuse the K120-transmission bolts after removal?

It is generally not recommended to reuse transmission bolts, as they can stretch and lose their clamping force over time. Always use new bolts when reassembling the transmission to ensure proper torque and prevent potential failures.

Q4

What tools are required to torque the K120-transmission bolts correctly?

You will need a calibrated torque wrench, a socket set that matches the bolt sizes, and a thread locker (if specified by the manufacturer). Ensure the torque wrench is set to the correct specification and follow a crisscross pattern when tightening to distribute the load evenly.

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 when applying torque to bolts.

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

Socket Set

A set of sockets compatible with transmission bolts.

  • Includes metric sizes
  • Durable construction for repeated use
Learn more
Service Procedures

K120 Transmission Bolt Torque Application

Detailed steps for applying the correct torque to K120 transmission bolts.

  • Ensure the vehicle is on a flat surface and the transmission is cool.
  • Remove the transmission cover to access the bolts.
  • Use a digital torque wrench to apply the specified torque to each bolt in a crisscross pattern.
  • Verify the torque using a torque angle gauge to ensure proper bolt stretch.
  • Reinstall the transmission cover and test the vehicle for proper operation.
View full procedure
Technical Service Bulletins

K120 Transmission Bolt Torque Specification Update

2021-05-15

Updated torque specifications for K120 transmission bolts to prevent over-tightening.

2019-Present Lexus UX

Resolution: Follow the updated torque specifications provided in the service manual and use a digital torque wrench for accuracy.

K120 Transmission Bolt Failure Report

2022-08-10

Reports of bolt failures due to incorrect torque application in K120 transmissions.

2019-Present Lexus UX

Resolution: Inspect all transmission bolts for proper torque and replace any damaged bolts. Ensure technicians are trained on the correct torque application procedure.

About the Author

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Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

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