Subaru Subaru WRX 2014-2021 Electrical System Bolt Torque Specifications & Ground Points
Subaru Subaru WRX 2014-2021

Subaru Subaru WRX 2014-2021 Electrical System Bolt Torque Specifications

Detailed electrical bolt torque specifications for the 2014-2021 Subaru WRX, including proper tightening values for critical components.

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

Ignition System

This subsystem includes components responsible for generating spark to ignite the air-fuel mixture in the engine. Proper torque ensures reliable electrical connections and prevents component damage.

1

Ignition Coil Bolts

M6 x 1.0
Torque Value
6 ft-lbs (8 N·m)
Important Notes
Ensure proper grounding and electrical connection. Avoid over-tightening to prevent damage.

Starting Charging System

This subsystem includes components responsible for starting the engine and charging the battery. Secure mounting and proper torque are essential for reliable operation.

1

Battery Terminal Nuts

M6 x 1.0
Torque Value
5 ft-lbs (7 N·m)
Important Notes
Ensures a secure electrical connection without damaging the battery terminals.
2

Starter Motor Mounting Bolts

M10 x 1.25
Torque Value
32.5 ft-lbs (44 N·m)
Important Notes
Ensures proper alignment and electrical grounding for the starter motor.
3

Alternator Mounting Bolts

M10 x 1.25
Torque Value
32.5 ft-lbs (44 N·m)
Important Notes
Ensures proper alignment and belt tension for the alternator.

Electrical System

This subsystem includes components related to the vehicle's electrical circuits, grounding, and control units. Proper torque ensures reliable connections and prevents electrical issues.

1

Ground Strap Bolts

M6 x 1.0
Torque Value
5 ft-lbs (7 N·m)
Important Notes
Estimated value. Ensures a solid grounding connection without damaging the components.
2

ECU Mounting Bolts

M6 x 1.0
Torque Value
8 ft-lbs (10.5 N·m)
Important Notes
Estimated value. Ensures secure mounting and grounding for the Engine Control Unit (ECU).
3

Sensor Mounting Bolts

M6 x 1.0
Torque Value
8 ft-lbs (10.5 N·m)
Important Notes
Estimated value. Ensures secure mounting of sensors for accurate operation.

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 battery terminal bolts on a 2014-2021 Subaru WRX?

The torque specification for the battery terminal bolts is **4.4 lb-ft (6 Nm)**. Over-tightening can damage the terminals, while under-tightening can lead to poor electrical connections.

Q2

Should I use anti-seize compound on electrical bolt threads?

No, anti-seize compound should not be used on electrical bolt threads, such as those for grounding points or battery terminals. It can interfere with conductivity and lead to electrical issues.

Q3

How often should I check the torque on electrical bolts?

Inspect and verify the torque on electrical bolts (e.g., battery terminals, grounding points) every **12 months** or after any major electrical work. Vibrations and temperature changes can cause bolts to loosen over time.

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 the exact torque required for electrical connections.

  • Adjustable torque settings
  • Digital display for accuracy
Learn more

Bolt Extractor Set

Essential for removing or tightening bolts in hard-to-reach areas.

  • Various sizes included
  • Durable and rust-resistant
Learn more

Insulated Screwdriver Set

Designed for safety when working with electrical components.

  • Non-conductive handles
  • Multiple tip sizes
Learn more
Service Procedures

Battery Terminal Torque Procedure

Steps to properly torque the battery terminals to ensure a secure connection.

  • Disconnect the negative terminal first.
  • Clean the terminals and posts.
  • Reconnect the positive terminal, then the negative.
  • Apply the specified torque using a torque wrench.
View full procedure

Alternator Bolt Torque Procedure

Detailed steps to torque the alternator bolts for secure mounting and electrical connection.

  • Loosen the alternator mounting bolts.
  • Adjust the alternator belt tension.
  • Tighten the bolts to the specified torque in sequence.
View full procedure

Starter Motor Bolt Torque Procedure

Procedure to ensure the starter motor bolts are correctly torqued.

  • Disconnect the battery.
  • Remove and inspect the starter motor.
  • Reinstall and torque the bolts to specifications.
View full procedure
Technical Service Bulletins

Electrical Connection Overheating

2017-05-15

Reports of overheating in electrical connections due to improper torque.

2015-2017 Subaru WRX

Resolution: Ensure all electrical connections are torqued to the specifications outlined in the service manual.

Battery Terminal Corrosion

2019-03-22

Excessive corrosion due to loose battery terminals.

2014-2019 Subaru WRX

Resolution: Clean terminals and ensure they are torqued to the correct specifications.

Alternator Bolt Loosening

2020-08-10

Alternator bolts may loosen over time due to insufficient torque.

2014-2021 Subaru WRX

Resolution: Retorque alternator bolts to the specified range and check belt tension.

About the Author

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Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

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