Subaru Subaru Ascent 2019-present Electrical System Bolt Torque Specifications & Ground Points
Subaru Subaru Ascent 2019-present

Subaru Subaru Ascent 2019-present Electrical System Bolt Torque Specifications

Detailed electrical bolt torque specifications for the 2019-Present Subaru Ascent, including torque values for various electrical 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

Electrical components

This subsystem includes electrical components such as the starter motor, alternator, ignition coil, and battery terminals. Proper torque ensures secure mounting and prevents damage to the components or surrounding parts.

1

Starter Motor Mounting Bolts

M12 x 1.5
Torque Value
29 ft-lbs (39.3 N·m)
Important Notes
Torque value range: 29-36 ft-lbs (39.3-48.9 nm)
2

Alternator Mounting Bolts

M12 x 1.5
Torque Value
29 ft-lbs (39.3 N·m)
Important Notes
Torque value range: 29-36 ft-lbs (39.3-48.9 nm)
3

Ignition Coil Bolt

M8 x 1.25
Torque Value
5 ft-lbs (6.8 N·m)
Important Notes
Torque value range: 5-6 ft-lbs (6.8-8.1 nm)

Battery and electrical connections

This subsystem includes the battery terminals and electrical connectors. Proper torque ensures a secure connection and prevents damage to the components or surrounding parts.

1

Battery Terminal Nuts

M10 x 1.5
Torque Value
5 ft-lbs (6.8 N·m)
Important Notes
Torque value range: 5-6 ft-lbs (6.8-8.1 nm)
2

Spark Plug Wire Boot Nuts

M8 x 1.25
Torque Value
10 ft-lbs (13.6 N·m)
Important Notes
Estimated torque value range: 10-12 ft-lbs (13.6-16.3 nm)
3

Fuel Injector Electrical Connector Bolts

M6 x 1.0
Torque Value
8 ft-lbs (10.8 N·m)
Important Notes
Estimated torque value range: 8-10 ft-lbs (10.8-13.6 nm)
4

Oxygen Sensor Electrical Connector Bolts

M6 x 1.0
Torque Value
8 ft-lbs (10.8 N·m)
Important Notes
Estimated torque value range: 8-10 ft-lbs (10.8-13.6 nm)

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 electrical bolts on my 2019-Present Subaru Ascent?

The recommended torque specification for the electrical bolts on your 2019-Present Subaru Ascent is 10-15 ft-lbs (13.6-20.3 Nm) for most electrical connections, such as battery terminals and wiring harnesses. However, it's essential to consult your owner's manual or a repair manual for specific torque values, as they may vary depending on the component and location.

Q2

Why is it important to follow the recommended torque specification for electrical bolts?

Following the recommended torque specification for electrical bolts is crucial to ensure a secure connection, prevent damage to components, and avoid electrical system malfunctions. Over-tightening can damage threads or strip the bolt head, while under-tightening can lead to loose connections and electrical issues.

Q3

How often should I inspect and maintain the electrical bolts on my Subaru Ascent?

It's recommended to inspect the electrical bolts on your Subaru Ascent every 12,000 to 15,000 miles (19,312 to 24,140 km) or as part of your regular maintenance schedule. Check for signs of wear, corrosion, or damage, and clean or replace the bolts as needed to ensure optimal electrical system performance.

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 torque wrench for applying accurate torque values

  • Range: 10-100 ft-lbs
  • Accuracy: ±2%
Learn more

Socket Set

A set of sockets for various bolt sizes

  • Sizes: 10mm, 12mm, 14mm
  • Material: Chrome Vanadium
Learn more

Torque Multiplier

A tool for increasing torque output

  • Ratio: 2:1
  • Max torque: 200 ft-lbs
Learn more
Service Procedures

Electrical System Torque Specification Application

A procedure for applying torque to electrical system bolts

  • Locate the electrical system bolt to be torqued
  • Select the correct socket size
  • Apply the recommended torque value using a torque wrench
  • Verify the torque value using a torque multiplier (if necessary)
View full procedure

Battery Terminal Torque Specification Application

A procedure for applying torque to battery terminals

  • Locate the battery terminal to be torqued
  • Select the correct socket size
  • Apply the recommended torque value using a torque wrench
  • Verify the torque value using a torque multiplier (if necessary)
View full procedure
Technical Service Bulletins

Electrical System Bolt Torque Specification Update

2020-02-15

An update to the electrical system bolt torque specifications for the 2019-Present Subaru Ascent

2019-2022 Subaru Ascent

Resolution: Update the torque specifications in the repair manual and apply the new values to all electrical system bolts

Battery Terminal Corrosion Prevention

2019-08-01

A bulletin outlining the procedures for preventing battery terminal corrosion on the 2019-Present Subaru Ascent

2019-2022 Subaru Ascent

Resolution: Apply a corrosion-preventing coating to the battery terminals and ensure proper torque values are applied

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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