Subaru Subaru Legacy 2015-2019 TR580 Transmission Transmission Torque Specifications & Bolt Torque Values
Subaru Subaru Legacy 2015-2019

Subaru Subaru Legacy 2015-2019 TR580 Transmission Torque Specifications

Detailed torque specifications for the TR580 transmission bolts on the 2015-2019 Subaru Legacy. Includes all necessary bolt types 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

Bolts and components that secure the transmission to the vehicle chassis and ensure proper alignment and stability.

1

Transmission Mounting Bolts

M10 x 1.25
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Ensure proper alignment of the transmission before tightening.
2

Transmission Crossmember Bolts

M12 x 1.75
Torque Value
59 ft-lbs (80 N·m)
Important Notes
Estimated value based on similar crossmember bolts.

Oil Pan

Bolts and components that secure the transmission oil pan and ensure a proper seal to prevent fluid leaks.

1

Transmission Oil Pan Bolts

M6 x 1.0
Torque Value
3.7 ft-lbs (5 N·m)
Important Notes
Use a crisscross pattern to avoid warping the oil pan.

Fluid Management

Plugs and fittings that allow for draining, filling, and cooling of the transmission fluid.

1

Transmission Drain Plug

M14 x 1.5
Torque Value
27 ft-lbs (37 N·m)
Important Notes
Ensure the plug is properly seated before tightening.
2

Transmission Fill Plug

M14 x 1.5
Torque Value
36 ft-lbs (49 N·m)
Important Notes
Ensure the plug is properly seated before tightening.
3

Transmission Cooler Line Fittings

M12 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Estimated value based on similar cooler line fittings.

Drivetrain Connections

Bolts and nuts that secure the drive axles, CV joints, and propeller shaft to the transmission.

1

Drive Axle/Half Shaft Bolts

M10 x 1.25
Torque Value
59 ft-lbs (80 N·m)
Important Notes
Ensure proper alignment of the drive axles before tightening.
2

CV Joint/Axle Nut

M24 x 1.5
Torque Value
147 ft-lbs (200 N·m)
Important Notes
Use a torque wrench with a high-capacity range.
3

Propeller/Drive Shaft Bolts

M8 x 1.25
Torque Value
27 ft-lbs (37 N·m)
Important Notes
Ensure proper alignment of the drive shaft before tightening.

Starter Motor

Bolts that secure the starter motor to the transmission housing.

1

Starter Motor Mounting Bolts

M8 x 1.25
Torque Value
29 ft-lbs (39 N·m)
Important Notes
Ensure proper alignment of the starter motor before tightening.

Torque Converter

Bolts that secure the torque converter to the flexplate.

1

Torque Converter Bolts

M8 x 1.25
Torque Value
27 ft-lbs (37 N·m)
Important Notes
Ensure proper alignment of the torque converter before tightening.

Shift Linkage

Bolts that secure the shift linkage to the transmission.

1

Shift Linkage Bolts

M6 x 1.0
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure proper alignment of the shift linkage before tightening.

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 torque specification for the TR580 transmission drain plug?

The torque specification for the TR580 transmission drain plug is 33.2 lb-ft (45 Nm). Ensure the transmission is cool before draining the fluid to avoid burns and use a new crush washer to prevent leaks.

Q2

How often should I check the torque on the TR580 transmission bolts?

It is recommended to check the torque on TR580 transmission bolts during routine maintenance, such as fluid changes or every 30,000 miles. Always refer to the manufacturer's service manual for specific intervals.

Q3

Can I reuse the transmission pan bolts on the TR580?

While reusing transmission pan bolts is generally acceptable, it is recommended to replace them if they show signs of wear, corrosion, or damage. Always torque them to the specified 7.2 lb-ft (9.8 Nm) to avoid over-tightening.

Q4

What happens if I over-torque the TR580 transmission bolts?

Over-torquing can strip threads, damage the transmission case, or cause leaks. Always use a calibrated torque wrench and follow the manufacturer's specifications to avoid costly repairs.

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
Learn more

Thread Locker

A chemical compound used to secure bolts and prevent loosening.

  • High-strength formula
  • Resistant to vibration and temperature changes
Learn more
Service Procedures

TR580 Transmission Bolt Torque Application

Detailed steps for applying the correct torque to TR580 transmission bolts.

  • Ensure the transmission is properly aligned and secured.
  • Clean the bolt threads and apply a small amount of thread locker.
  • Using a digital torque wrench, tighten the bolts to the specified torque value in a crisscross pattern.
  • Use a torque angle gauge to verify the angle of rotation if required.
  • Double-check all bolts to ensure they are properly torqued.
View full procedure

Transmission Bolt Inspection

Procedure for inspecting transmission bolts for wear or damage.

  • Remove the transmission cover and visually inspect all bolts.
  • Check for signs of thread wear, corrosion, or damage.
  • Replace any bolts that show signs of wear or damage.
  • Re-torque all bolts to the specified value after inspection.
View full procedure
Technical Service Bulletins

TR580 Transmission Bolt Torque Specification Update

2017-05-15

Updated torque specifications for TR580 transmission bolts to address potential loosening issues.

2015-2019 Subaru Legacy

Resolution: Apply the updated torque specifications and use thread locker to prevent loosening.

Transmission Bolt Failure Investigation

2018-09-20

Investigation into reports of transmission bolt failures in TR580-equipped vehicles.

2015-2019 Subaru Legacy

Resolution: Replace affected bolts with updated parts and ensure proper torque application during installation.

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.

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