Subaru Subaru WRX 2022-present Drivetrain Bolt Torque Specifications & Fastener Values
Subaru Subaru WRX 2022-present

Subaru Subaru WRX 2022-present Drivetrain Bolt Torque Specifications

Comprehensive torque specifications for the drivetrain bolts of the 2022-Present Subaru WRX, including axle nuts, transmission mounts, and differential fasteners.

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

Bolt torque specifications for engine components, including flywheel, main bearings, connecting rods, and camshaft sprocket.

1

Flywheel Bolts

M12 x 1.5
Torque Value
51 ft-lbs (69 N·m)
Important Notes
Proper torque ensures the flywheel is properly seated and the engine's rotational energy is transferred to the transmission.
2

Main Bearing Bolts

M14 x 1.5
Torque Value
55 ft-lbs (75 N·m)
Important Notes
Proper torque ensures the main bearings are properly seated and the crankshaft is supported.
3

Connecting Rod Nuts

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Proper torque ensures the connecting rods are properly seated and the engine's rotational energy is transferred to the pistons.
4

Camshaft Sprocket Bolt

M12 x 1.5
Torque Value
50 ft-lbs (68 N·m)
Important Notes
Proper torque ensures the camshaft sprocket is properly seated and the engine's valve timing is maintained.

Transmission

Bolt torque specifications for transmission components, including transmission mounting bolts, transmission pan bolts, and differential cover bolts.

1

Transmission Mounting Bolts

M14 x 1.5
Torque Value
30 ft-lbs (41 N·m)
Important Notes
Proper torque ensures the transmission is properly seated and the drivetrain's rotational energy is transferred to the wheels.
2

Transmission Pan Bolts

M10 x 1.5
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Proper torque ensures the transmission pan is properly seated and the transmission fluid is contained.
3

Differential Cover Bolts

M12 x 1.5
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Proper torque ensures the differential cover is properly seated and the differential fluid is contained.

Drivetrain

Bolt torque specifications for drivetrain components, including drive axle/half shaft bolts, CV joint/axle nut, and propeller/drive shaft bolts.

1

Drive Axle/Half Shaft Bolts

M14 x 1.5
Torque Value
47 ft-lbs (64 N·m)
Important Notes
Proper torque ensures the drive axles/half shafts are properly seated and the drivetrain's rotational energy is transferred to the wheels.
2

CV Joint/Axle Nut

M16 x 1.5
Torque Value
137 ft-lbs (186 N·m)
Important Notes
Proper torque ensures the CV joint is properly seated and the drivetrain's rotational energy is transferred to the wheels.
3

Propeller/Drive Shaft Bolts

M10 x 1.5
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Proper torque ensures the propeller/drive shaft is properly seated and the drivetrain's rotational energy is transferred to the wheels.

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 are the torque specifications for the drivetrain bolts on a 2022-Present Subaru WRX?

The torque specifications vary by component. For example, the front axle hub nut should be torqued to 137 ft-lbs (186 Nm), while the rear differential drain plug requires 36 ft-lbs (49 Nm). Always refer to the official Subaru service manual for precise values.

Q2

How often should I check the torque on drivetrain bolts?

It's recommended to check the torque after the first 1,000 miles of driving a new vehicle and after any drivetrain maintenance or repairs. Regular inspections during routine service intervals also help ensure bolts remain secure.

Q3

Can I reuse drivetrain bolts after removal?

Reusing bolts depends on their condition and the manufacturer's guidelines. Some bolts, like axle nuts, are designed for one-time use and must be replaced. Always inspect bolts for wear, stretching, or damage before reusing them.

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

High-precision torque wrench for accurate bolt tightening.

  • Adjustable torque settings
  • LCD display for real-time readings
Learn more

Socket Set

Comprehensive socket set for various bolt sizes.

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

Torque Angle Gauge

Tool for measuring bolt rotation angles during tightening.

  • Easy-to-read scale
  • Magnetic base for secure attachment
Learn more
Service Procedures

Drivetrain Bolt Torque Specifications

Detailed steps for applying correct torque to drivetrain bolts.

  • Locate all drivetrain bolts as per service manual.
  • Set digital torque wrench to specified torque value.
  • Tighten bolts in a crisscross pattern to ensure even pressure.
  • Use torque angle gauge for bolts requiring angle tightening.
  • Double-check all bolts for proper torque settings.
View full procedure
Technical Service Bulletins

Drivetrain Bolt Loosening Issue

2023-05-15

Bulletin regarding reported cases of drivetrain bolts loosening over time.

2022-Present Subaru WRX

Resolution: Re-torque all drivetrain bolts to factory specifications and apply thread locker where recommended.

Incorrect Drivetrain Torque Specifications

2023-08-20

Bulletin addressing incorrect torque specifications provided in early service manuals.

2022-Present Subaru WRX

Resolution: Refer to updated service manual for corrected torque specifications and re-torque as necessary.

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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Technical Information
  • All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
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