Subaru Subaru Ascent 2019-present Drivetrain Bolt Torque Specifications & Fastener Values
Subaru Subaru Ascent 2019-present

Subaru Subaru Ascent 2019-present Drivetrain Bolt Torque Specifications

Detailed drivetrain bolt torque specifications for the 2019-Present Subaru Ascent, including transmission, transfer case, and drivetrain component torque values.

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 block and crankshaft

Components that secure the crankshaft and main bearings in the engine block.

1

Main Bearing Bolts

M14 x 1.5
Torque Value
58 ft-lbs (78.5 N·m)
Important Notes
Proper torque ensures the bearings are seated correctly, preventing damage to the crankshaft and engine block.
2

Crankshaft Pulley Bolt

M16 x 1.5
Torque Value
80 ft-lbs (108.5 N·m)
Important Notes
Proper torque ensures the pulley is securely attached, preventing damage to the crankshaft and serpentine belt.

Cylinder head and valvetrain

Components that secure the cylinder head and valvetrain components.

1

Camshaft Sprocket Bolt

M10 x 1.5
Torque Value
40 ft-lbs (54.2 N·m)
Important Notes
Proper torque ensures the sprocket is securely attached, preventing damage to the camshaft and timing belt or chain.
2

Timing Belt/Chain Tensioner Bolt

M8 x 1.25
Torque Value
20 ft-lbs (27.1 N·m)
Important Notes
Proper torque ensures the tensioner is securely attached, preventing damage to the timing belt or chain.

Transmission and drivetrain

Components that secure the transmission and drivetrain components.

1

Transmission Mounting Bolts

M12 x 1.5
Torque Value
40 ft-lbs (54.2 N·m)
Important Notes
Proper torque ensures the transmission is securely attached, preventing damage to the transmission and surrounding components.
2

Transmission Oil Pan Bolts

M10 x 1.5
Torque Value
69 ft-lbs (93.6 N·m)
Important Notes
Proper torque ensures the oil pan is securely attached, preventing oil leaks and damage to the transmission.
3

Drive Axle/Half Shaft Bolts

M14 x 1.5
Torque Value
48 ft-lbs (65.1 N·m)
Important Notes
Proper torque ensures the drive axles or half shafts are securely attached, preventing damage to the transmission and differential.
4

Drive Axle/Half Shaft Nut

M16 x 1.5
Torque Value
120 ft-lbs (162.7 N·m)
Important Notes
Proper torque ensures the drive axle or half shaft is securely attached, preventing damage to the wheel hub or steering knuckle.

Differential and axle

Components that secure the differential and axle components.

1

Differential Drain/Fill Plug

M12 x 1.5
Torque Value
36 ft-lbs (48.9 N·m)
Important Notes
Proper torque ensures the plug is securely attached, preventing fluid leaks and damage to the differential.
2

Transfer Case Drain/Fill Plug

M10 x 1.5
Torque Value
36 ft-lbs (48.9 N·m)
Important Notes
Proper torque ensures the plug is securely attached, preventing fluid leaks and damage to the transfer case.

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 drivetrain bolts on my 2019-Present Subaru Ascent?

The recommended torque specification for the drivetrain bolts on your 2019-Present Subaru Ascent varies depending on the specific bolt location and type. Refer to the owner's manual or the repair manual for the correct torque specification. Generally, the torque specs range from 30-80 ft-lbs for most drivetrain bolts.

Q2

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

Following the recommended torque specification for drivetrain bolts is crucial to ensure the longevity and reliability of your vehicle's drivetrain system. Over-torquing can damage the bolts, while under-torquing can lead to loose connections and premature wear. Proper torque specification helps maintain the correct clamping force, preventing damage to the drivetrain components.

Q3

How often should I check the torque specification of my drivetrain bolts?

It is recommended to check the torque specification of your drivetrain bolts every 12,000 to 15,000 miles, or as specified in your owner's manual. Additionally, if you notice any unusual noises, vibrations, or performance issues, have your drivetrain bolts inspected and re-torqued as needed.

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 accurate bolt tightening

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

Socket Set

A set of sockets for drivetrain bolt removal and installation

  • Sizes: 10mm, 12mm, 14mm
  • Drive type: 3/8" and 1/2"
Learn more

Breaker Bar

A long-handled breaker bar for added leverage

  • Length: 24"
  • Drive type: 3/8" and 1/2"
Learn more
Service Procedures

Drivetrain Bolt Tightening Procedure

A step-by-step guide to tightening drivetrain bolts to the correct torque specification

  • Step 1: Locate the drivetrain bolts to be tightened
  • Step 2: Clean the bolt threads and surrounding area
  • Step 3: Apply the recommended torque specification using a torque wrench
  • Step 4: Verify the torque specification using a secondary torque wrench
View full procedure

Drivetrain Bolt Replacement Procedure

A step-by-step guide to replacing drivetrain bolts

  • Step 1: Remove the old bolt using a socket and breaker bar
  • Step 2: Inspect the bolt threads and surrounding area for damage
  • Step 3: Install the new bolt and tighten to the correct torque specification
View full procedure
Technical Service Bulletins

Drivetrain Bolt Torque Specification Update

2020-02-15

An update to the drivetrain bolt torque specification for the 2019-Present Subaru Ascent

2019-2022 Subaru Ascent

Resolution: Update the torque specification to 40 ft-lbs for the drivetrain bolts

Drivetrain Bolt Thread Damage

2019-08-01

A technical bulletin regarding drivetrain bolt thread damage on the 2019-Present Subaru Ascent

2019-2020 Subaru Ascent

Resolution: Inspect the bolt threads and surrounding area for damage and replace 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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