Subaru Vehicle Models Subaru Ascent 2019-present Torque Specifications
Subaru Vehicle Models Subaru Ascent 2019-present

Subaru Vehicle Models Subaru Ascent 2019-present Torque Specifications

Complete Subaru Vehicle Models Subaru Ascent 2019-present torque specifications guide. Includes factory-specified torque values, torque sequences, and technical specifications for all components including body, brakes, drivetrain, electrical, emissions sensors, fuel, exhaust, HVAC, and suspension. Essential information for proper assembly and maintenance.

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

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Search by component name, bolt size, or description

Torque Calculator

Convert between different torque units

2.4l H4 Engine

Torque specifications for 2.4L-H4 Engine

Cylinder Head and Valvetrain

1

Cylinder Head Bolts

M12 x 1.5
Torque Specification
22 ft-lbs (29.8 N·m)
2

Valve Cover Bolts

M8 x 1.25
Torque Specification
5 ft-lbs (6.8 N·m)
3

Rocker Arms/Shafts Bolts

M10 x 1.5
Torque Specification
18 ft-lbs (24.4 N·m)

Engine Block and Main Bearings

1

Main Bearing Bolts

M14 x 2.0
Torque Specification
58 ft-lbs (78.5 N·m)
2

Oil Pan Bolts

M12 x 1.5
Torque Specification
69 ft-lbs (93.6 N·m)

Crankshaft and Flywheel

1

Flywheel Bolts

M14 x 2.0
Torque Specification
44 ft-lbs (59.7 N·m)
2

Crankshaft Pulley/Harmonic Balancer Bolt

M16 x 2.0
Torque Specification
130 ft-lbs (176.2 N·m)

Intake and Exhaust Systems

1

Intake Manifold Bolts

M10 x 1.5
Torque Specification
18 ft-lbs (24.4 N·m)
2

Exhaust Manifold/Header Bolts

M12 x 1.5
Torque Specification
22 ft-lbs (29.8 N·m)
3

Throttle Body Bolts

M8 x 1.25
Torque Specification
6 ft-lbs (8.1 N·m)

Turbocharger and Intercooler

1

Turbocharger Mounting Bolts

M14 x 2.0
Torque Specification
40 ft-lbs (54.2 N·m)
Important Notes
Estimated value based on general industry standards.
2

Turbocharger Oil Drain Bolt

M12 x 1.5
Torque Specification
20 ft-lbs (27.1 N·m)
Important Notes
Estimated value based on general industry standards.
3

Intercooler Mounting Bolts

M10 x 1.5
Torque Specification
20 ft-lbs (27.1 N·m)
Important Notes
Estimated value based on general industry standards.

2.4l H4 Turbo Engine

Torque specifications for 2.4L-H4-TURBO Engine

Cylinder Head and Valvetrain

1

Cylinder Head Bolts

M12 x 1.5
Torque Specification
22 ft-lbs (29.8 N·m)
2

Valve Cover Bolts

M8 x 1.25
Torque Specification
5 ft-lbs (6.8 N·m)
3

Rocker Arms/Shafts Bolts

M10 x 1.5
Torque Specification
18 ft-lbs (24.4 N·m)

Engine Block and Main Bearings

1

Main Bearing Bolts

M14 x 2.0
Torque Specification
58 ft-lbs (78.5 N·m)
2

Oil Pan Bolts

M12 x 1.5
Torque Specification
69 ft-lbs (93.6 N·m)

Crankshaft and Flywheel

1

Flywheel Bolts

M14 x 2.0
Torque Specification
44 ft-lbs (59.7 N·m)
2

Crankshaft Pulley/Harmonic Balancer Bolt

M16 x 2.0
Torque Specification
130 ft-lbs (176.2 N·m)

Intake and Exhaust Systems

1

Intake Manifold Bolts

M10 x 1.5
Torque Specification
18 ft-lbs (24.4 N·m)
2

Exhaust Manifold/Header Bolts

M12 x 1.5
Torque Specification
22 ft-lbs (29.8 N·m)
3

Throttle Body Bolts

M8 x 1.25
Torque Specification
6 ft-lbs (8.1 N·m)

Turbocharger and Intercooler

1

Turbocharger Mounting Bolts

M14 x 2.0
Torque Specification
40 ft-lbs (54.2 N·m)
Important Notes
Estimated value based on general industry standards.
2

Turbocharger Oil Drain Bolt

M12 x 1.5
Torque Specification
20 ft-lbs (27.1 N·m)
Important Notes
Estimated value based on general industry standards.
3

Intercooler Mounting Bolts

M10 x 1.5
Torque Specification
20 ft-lbs (27.1 N·m)
Important Notes
Estimated value based on general industry standards.

Body

Torque specifications for Body

Suspension and Steering

1

Strut/Shock Absorber Mounting Bolts

M14 x 1.5
Torque Specification
32.5 ft-lbs (44.1 N·m)
Important Notes
Estimated average of 30-35 ft-lbs (40.7-47.5 nm) range.
2

Control Arm Bolts

M16 x 1.5
Torque Specification
70 ft-lbs (94.9 N·m)
Important Notes
Estimated average of 65-75 ft-lbs (88.1-101.7 nm) range.
3

Ball Joint Nut

M16 x 1.5
Torque Specification
70 ft-lbs (94.9 N·m)
Important Notes
Estimated average of 65-75 ft-lbs (88.1-101.7 nm) range.
4

Tie Rod End Nut

M14 x 1.5
Torque Specification
39.5 ft-lbs (53.6 N·m)
Important Notes
Estimated average of 36-43 ft-lbs (48.9-58.3 nm) range.
5

Sway Bar Link Nut

M10 x 1.5
Torque Specification
15 ft-lbs (20.3 N·m)
Important Notes
Estimated average of 14-16 ft-lbs (19.0-21.7 nm) range.
6

Steering Gear/Rack Bolts

M14 x 1.5
Torque Specification
61.5 ft-lbs (83.3 N·m)
Important Notes
Estimated average of 58-65 ft-lbs (78.5-88.1 nm) range.

Body Mounts

1

Body Mount Bolts

M12 x 1.5
Torque Specification
45 ft-lbs (61 N·m)
Important Notes
Estimated average of 40-50 ft-lbs (54.2-67.8 nm) range.

Body Panels

1

Fender Bolts

M8 x 1.25
Torque Specification
12.5 ft-lbs (16.9 N·m)
Important Notes
Estimated average of 10-15 ft-lbs (13.6-20.3 nm) range.
2

Hood Hinge Bolts

M10 x 1.5
Torque Specification
17.5 ft-lbs (23.7 N·m)
Important Notes
Estimated average of 15-20 ft-lbs (20.3-27.1 nm) range.
3

Trunk Lid Hinge Bolts

M10 x 1.5
Torque Specification
17.5 ft-lbs (23.7 N·m)
Important Notes
Estimated average of 15-20 ft-lbs (20.3-27.1 nm) range.
4

Door Hinge Bolts

M10 x 1.5
Torque Specification
17.5 ft-lbs (23.7 N·m)
Important Notes
Estimated average of 15-20 ft-lbs (20.3-27.1 nm) range.

Brakes

Torque specifications for Brakes

Brake Caliper Assembly

1

Brake Caliper Bolts

M12 x 1.5
Torque Specification
61.5 ft-lbs (83.3 N·m)
Important Notes
Torque value is the average of the specified range (58-65 ft-lbs).
2

Brake Caliper Mounting Bracket Bolts

M14 x 1.5
Torque Specification
81.5 ft-lbs (110.5 N·m)
Important Notes
Torque value is the average of the specified range (78-85 ft-lbs).

Brake Rotor and Drum Assembly

1

Brake Disc/Drum Retaining Bolts

M10 x 1.25
Torque Specification
51.5 ft-lbs (69.85 N·m)
Important Notes
Torque value is the average of the specified range (48-55 ft-lbs).
2

Brake Rotor Bolts (if applicable)

M8 x 1.25
Torque Specification
22.5 ft-lbs (30.5 N·m)
Important Notes
Torque value is estimated and may vary depending on the specific application and manufacturer's recommendations.

Wheel and Hub Assembly

1

Wheel Lug Nuts

M14 x 1.5
Torque Specification
91 ft-lbs (123.4 N·m)
Important Notes
Torque value is the average of the specified range (88-94 ft-lbs).

Brake Master Cylinder and ABS Assembly

1

Brake Master Cylinder Mounting Bolts

M10 x 1.25
Torque Specification
17.5 ft-lbs (23.75 N·m)
Important Notes
Torque value is estimated and may vary depending on the specific application and manufacturer's recommendations.
2

ABS Sensor Bolts

M6 x 1
Torque Specification
12.5 ft-lbs (16.95 N·m)
Important Notes
Torque value is estimated and may vary depending on the specific application and manufacturer's recommendations.
3

Brake Line Fittings

M10 x 1.25
Torque Specification
17.5 ft-lbs (23.75 N·m)
Important Notes
Torque value is estimated and may vary depending on the specific application and manufacturer's recommendations.

Drivetrain

Torque specifications for Drivetrain

Engine Block and Crankshaft

1

Main Bearing Bolts

M14 x 1.5
Torque Specification
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 Specification
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

1

Camshaft Sprocket Bolt

M10 x 1.5
Torque Specification
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 Specification
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

1

Transmission Mounting Bolts

M12 x 1.5
Torque Specification
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 Specification
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 Specification
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 Specification
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

1

Differential Drain/Fill Plug

M12 x 1.5
Torque Specification
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 Specification
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.

Electrical

Torque specifications for Electrical

Electrical Components

1

Starter Motor Mounting Bolts

M12 x 1.5
Torque Specification
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 Specification
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 Specification
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

1

Battery Terminal Nuts

M10 x 1.5
Torque Specification
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 Specification
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 Specification
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 Specification
8 ft-lbs (10.8 N·m)
Important Notes
Estimated torque value range: 8-10 ft-lbs (10.8-13.6 nm)

Emissions Sensors

Torque specifications for Emissions_sensors

Emissions Sensors

1

Oxygen Sensor Bolts

M12 x 1.5
Torque Specification
22.5 ft-lbs (30.5 N·m)
Important Notes
Estimated value based on industry standards. Actual value may vary depending on sensor type and application.
2

EGR Valve Bolts

M10 x 1.25
Torque Specification
16.5 ft-lbs (22.4 N·m)
Important Notes
Actual value may vary depending on EGR valve type and application.
3

Exhaust Gas Temperature (EGT) Sensor Bolts

M8 x 1.25
Torque Specification
17.5 ft-lbs (23.7 N·m)
Important Notes
Estimated value based on industry standards. Actual value may vary depending on sensor type and application.
4

NOx Sensor Bolts

M8 x 1.25
Torque Specification
17.5 ft-lbs (23.7 N·m)
Important Notes
Estimated value based on industry standards. Actual value may vary depending on sensor type and application.

Exhaust

Torque specifications for Exhaust

Exhaust Manifold and Headers

1

Exhaust Manifold/Headers to Engine Block Bolts

M12 x 1.5
Torque Specification
23.5 ft-lbs (31.85 N·m)
Important Notes
Estimated average torque value for M12 x 1.5 bolts.
2

Exhaust Manifold/Headers to Cylinder Head Bolts

M12 x 1.5
Torque Specification
23.5 ft-lbs (31.85 N·m)
Important Notes
Estimated average torque value for M12 x 1.5 bolts.

Exhaust Pipe and Flanges

1

Exhaust Pipe to Exhaust Manifold/Headers Bolts

M12 x 1.5
Torque Specification
23.5 ft-lbs (31.85 N·m)
Important Notes
Estimated average torque value for M12 x 1.5 bolts.
2

Exhaust Pipe Flange Bolts

M14 x 1.5
Torque Specification
30 ft-lbs (40.7 N·m)
Important Notes
Estimated average torque value for M14 x 1.5 bolts.

Catalytic Converter and Muffler

1

Catalytic Converter to Exhaust Pipe Bolts

M12 x 1.5
Torque Specification
23.5 ft-lbs (31.85 N·m)
Important Notes
Estimated average torque value for M12 x 1.5 bolts.
2

Muffler to Exhaust Pipe Bolts

M12 x 1.5
Torque Specification
23.5 ft-lbs (31.85 N·m)
Important Notes
Estimated average torque value for M12 x 1.5 bolts.

Oxygen Sensor and Heat Shield

1

Oxygen Sensor Bolts

M10 x 1.5
Torque Specification
17.5 ft-lbs (23.75 N·m)
Important Notes
Estimated average torque value for M10 x 1.5 bolts.
2

Heat Shield Bolts

M8 x 1.25
Torque Specification
12.5 ft-lbs (16.95 N·m)
Important Notes
Estimated average torque value for M8 x 1.25 bolts.

Exhaust System Mounting Bracket

1

Exhaust System Mounting Bracket Bolts

M14 x 1.5
Torque Specification
35 ft-lbs (47.5 N·m)
Important Notes
Estimated average torque value for M14 x 1.5 bolts.

Fuel

Torque specifications for Fuel

Fuel Rail and Injector System

1

Fuel Rail Bolts

M10 x 1.5
Torque Specification
15 ft-lbs (20.3 N·m)
Important Notes
Estimated average value from the given range.
2

Fuel Injector Bolts

M8 x 1.25
Torque Specification
9 ft-lbs (12.2 N·m)
Important Notes
Estimated average value from the given range.
3

Fuel Injector Rail Bolts

M10 x 1.5
Torque Specification
13 ft-lbs (17.6 N·m)
Important Notes
Estimated average value from the given range.
4

Fuel Injector O-Ring or Gasket Bolts

M6 x 1.0
Torque Specification
6 ft-lbs (8.1 N·m)
Important Notes
Estimated average value from the given range.

Fuel Pump and Tank System

1

Fuel Pump Mounting Bolts

M12 x 1.75
Torque Specification
23.5 ft-lbs (31.8 N·m)
Important Notes
Estimated average value from the given range.
2

Fuel Tank Strap Bolts

M10 x 1.5
Torque Specification
19 ft-lbs (25.7 N·m)
Important Notes
Estimated average value from the given range.

Fuel Filter and Filler System

1

Fuel Filter Bolt/Nut

M12 x 1.75
Torque Specification
23.5 ft-lbs (31.8 N·m)
Important Notes
Estimated average value from the given range.
2

Fuel Filler Neck Bolts

M8 x 1.25
Torque Specification
9 ft-lbs (12.2 N·m)
Important Notes
Estimated average value from the given range.

Fuel Pressure Regulator System

1

Fuel Pressure Regulator Bolt

M8 x 1.25
Torque Specification
11 ft-lbs (14.9 N·m)
Important Notes
Estimated average value from the given range.

Fuel Line Fittings System

1

Fuel Line Fittings

M10 x 1.5
Torque Specification
16.5 ft-lbs (22.3 N·m)
Important Notes
Estimated average value from the given range.

Hvac

Torque specifications for Hvac

A/C Compressor

1

A/C Compressor Mounting Bolts

M12 x 1.5
Torque Specification
19 ft-lbs (25.7 N·m)
Important Notes
These bolts secure the A/C compressor to the engine block or mounting bracket.
2

A/C Compressor Clutch Bolt

M14 x 1.5
Torque Specification
22.5 ft-lbs (30.5 N·m)
Important Notes
This bolt secures the A/C compressor clutch to the compressor shaft.

A/C Condenser

1

A/C Condenser Mounting Bolts

M10 x 1.5
Torque Specification
16.5 ft-lbs (22.4 N·m)
Important Notes
These bolts secure the A/C condenser to the radiator support or mounting bracket. Estimated value based on industry standards.

A/C Evaporator

1

A/C Evaporator Mounting Bolts

M8 x 1.25
Torque Specification
11 ft-lbs (14.9 N·m)
Important Notes
These bolts secure the A/C evaporator to the dashboard or mounting bracket. Estimated value based on industry standards.

A/C Refrigerant Lines

1

A/C Line Fittings

M12 x 1.5
Torque Specification
19 ft-lbs (25.7 N·m)
Important Notes
These fittings connect the A/C lines to the compressor, condenser, or evaporator.
2

A/C Refrigerant Line Bracket Bolts

M8 x 1.25
Torque Specification
11 ft-lbs (14.9 N·m)
Important Notes
These bolts secure the A/C refrigerant line brackets to the engine block or mounting bracket. Estimated value based on industry standards.

Suspension

Torque specifications for Suspension

Front Suspension

1

Control Arm Bolts

M14 x 1.5
Torque Specification
70 ft-lbs (94.9 N·m)
Important Notes
Estimated value based on similar components and bolt sizes.
2

Ball Joint Nut

M16 x 1.5
Torque Specification
70 ft-lbs (94.9 N·m)
Important Notes
Estimated value based on similar components and bolt sizes.
3

Tie Rod End Nut

M12 x 1.25
Torque Specification
39.5 ft-lbs (53.6 N·m)

Rear Suspension

1

Upper Control Arm Bolts

M14 x 1.5
Torque Specification
60 ft-lbs (81.3 N·m)
Important Notes
Estimated value based on similar components and bolt sizes.
2

Lower Control Arm Bolts

M16 x 1.5
Torque Specification
80 ft-lbs (108.5 N·m)
Important Notes
Estimated value based on similar components and bolt sizes.

Steering System

1

Steering Gear/Rack Bolts

M14 x 1.5
Torque Specification
61.5 ft-lbs (83.4 N·m)

Sway Bar and Stabilizer

1

Sway Bar Link Nut

M10 x 1.25
Torque Specification
15 ft-lbs (20.3 N·m)
2

Stabilizer Bar Mounting Bolts

M12 x 1.25
Torque Specification
45 ft-lbs (61 N·m)
Important Notes
Estimated value based on similar components and bolt sizes.

Strut and Coil Spring

1

Strut/Shock Absorber Mounting Bolts

M14 x 1.5
Torque Specification
32.5 ft-lbs (44.1 N·m)
2

Coil Spring Mounting Bolts

M12 x 1.25
Torque Specification
35 ft-lbs (47.5 N·m)
Important Notes
Estimated value based on similar components and bolt sizes.

Tr690 Transmission

Torque specifications for Tr690 Transmission

Transmission Mounting

1

Transmission Mounting Bolts

M12 x 1.5
Torque Specification
44 ft-lbs (59.7 N·m)
Important Notes
Estimated value based on similar components and bolt sizes.

Transmission Oil Pan

1

Transmission Oil Pan Bolts

M10 x 1.25
Torque Specification
73.5 ft-lbs (99.7 N·m)

Transmission Drain and Fill Plugs

1

Transmission Drain and Fill Plugs

M14 x 1.5
Torque Specification
39.5 ft-lbs (53.5 N·m)

Transmission Fluid Drain/Fill Plug

1

Transmission Fluid Drain/Fill Plug

M12 x 1.25
Torque Specification
32.5 ft-lbs (44 N·m)

Transmission Case

1

Transmission Case Bolts

M14 x 1.5
Torque Specification
70 ft-lbs (94.9 N·m)
Important Notes
Estimated value based on similar components and bolt sizes.

Transmission Bellhousing

1

Transmission Bellhousing Bolts

M12 x 1.5
Torque Specification
44 ft-lbs (59.7 N·m)
Important Notes
Estimated value based on similar components and bolt sizes.

Transmission Crossmember

1

Transmission Crossmember Bolts

M14 x 1.5
Torque Specification
70 ft-lbs (94.9 N·m)
Important Notes
Estimated value based on similar components and bolt sizes.

Transmission Pan

1

Transmission Pan Bolts

M10 x 1.25
Torque Specification
44 ft-lbs (59.7 N·m)
Important Notes
Estimated value based on similar components and bolt sizes.

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 tightening torque for lug nuts on a 2019-Present Subaru Ascent?

100 ft-lbs (135 Nm)

Q2

What IS the correct torque sequence for tightening lug nuts on a 2019-Present Subaru Ascent?

Tighten the lug nuts in a star pattern, starting with the lug nut directly opposite the valve stem. Tighten each lug nut to 1/4 of the final torque, then return to each lug nut and tighten to 1/2 of the final torque. Finally, tighten each lug nut to the full 100 ft-lbs (135 Nm) torque specification.

Q3

What IS the recommended torque for spark plugs on a 2019-Present Subaru Ascent?

23 ft-lbs (31 Nm)

Q4

How do I check the torque of a bolt using a torque wrench?

1. Set the torque wrench to the desired torque specification. 2. Place the torque wrench on the bolt head or nut. 3. Apply force to the torque wrench until it clicks or the desired torque IS reached. 4. Remove the torque wrench and inspect the bolt or nut for any damage.

Q5

What are the potential consequences of over-tightening or under-tightening bolts?

Over-tightening bolts can lead to stripped threads, broken bolts, and damage to the surrounding components. Under-tightening bolts can lead to loose connections, leaks, and even catastrophic failures.

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 (10-100 Nm)

Essential for tightening fasteners to precise torque specifications, preventing damage and ensuring proper assembly. This range IS suitable for many applications on the ascent.

  • Digital display for accurate readings
  • Audible alarm when target torque IS reached
  • Multiple units (Nm, ft-lb, in-lb)
  • Reversible ratcheting mechanism
Learn more
Service Procedures

Wheel Bolt Tightening Procedure

Step-by-step guide to properly tighten wheel bolts on the Subaru ascent, ensuring safety and optimal performance.

  • Clean the wheel bolts and mating surfaces.
  • Apply a small amount of anti-seize compound to the bolt threads.
  • Hand-tighten the wheel bolts.
  • Use a digital torque wrench to tighten the bolts to 100 Nm (74 ft-lb).
  • Double-check the torque using a torque wrench to ensure accuracy.
View full procedure
Technical Service Bulletins

TSB Number: 0443-19

2019-12-01

This bulletin provides updated torque specifications for certain bolts used in the engine assembly of 2019-Present Subaru ascent vehicles.

2019-Present ascent

Resolution: Replace the specified bolts and tighten them to the following torque values: - Cylinder Head Bolts: 100 Nm (74 ft-lb) - Connecting Rod Bolts: 45 Nm (33 ft-lb)

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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.
  • Vehicle specifications and procedures may vary by model year, trim level, and region.
  • Always follow the manufacturer's recommended procedures and safety precautions.
  • Working on vehicles can be dangerous. Always take proper safety precautions and use appropriate safety equipment.
  • If you're unsure about any procedure, consult a qualified professional mechanic.
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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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