Volvo Volvo S90 2016-present TG-81 Transmission Transmission Torque Specifications & Bolt Torque Values
Volvo Volvo S90 2016-present

Volvo Volvo S90 2016-present TG-81 Transmission Torque Specifications

Detailed torque specifications for the TG-81 transmission bolts in the 2016-Present Volvo S90, including proper tightening procedures and recommended tools.

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

Transmission mounting

This subsystem includes the bolts that secure the transmission to the engine block and transmission crossmember.

1

Transmission Mounting Bolts

M14 x 1.5
Torque Value
37 ft-lbs (50 N·m)

Transmission oil pan

This subsystem includes the bolts that secure the oil pan to the transmission case.

1

Transmission Oil Pan Bolts

M10 x 1.25
Torque Value
80 in-lbs (9 N·m)
Important Notes
Note: The torque value is in inch-pounds, not foot-pounds.

Transmission fluid system

This subsystem includes the plugs and fittings that are used to drain and fill the transmission fluid.

1

Transmission Drain and Fill Plugs

M12 x 1.5
Torque Value
22 ft-lbs (30 N·m)
2

Transmission Fluid Drain/Fill Plug

M14 x 1.5
Torque Value
37 ft-lbs (50 N·m)

Transmission bellhousing

This subsystem includes the bolts that secure the bellhousing to the transmission case and engine block.

1

Transmission Bellhousing Bolts

M16 x 1.5
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Estimated value based on industry standards.

Transmission crossmember

This subsystem includes the bolts that secure the transmission crossmember to the frame.

1

Transmission Crossmember Bolts

M18 x 1.5
Torque Value
59 ft-lbs (80 N·m)
Important Notes
Estimated value based on industry standards.

Torque converter

This subsystem includes the bolts that secure the torque converter to the transmission case.

1

Torque Converter Bolts

M14 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Estimated value based on industry standards.

Transmission cooler lines

This subsystem includes the fittings that connect the transmission cooler lines to the transmission case.

1

Transmission Cooler Line Fittings

M10 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Estimated value based on industry standards.

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 TG-81 transmission bolts on a 2016-Present Volvo S90?

The TG-81 transmission bolts should be torqued to 40 Nm + 90 degrees. Always refer to the manufacturer's service manual for precise instructions, as deviations can lead to transmission issues.

Q2

How often should the transmission bolts be checked for proper torque?

It is recommended to check the torque of the TG-81 transmission bolts every 60,000 miles or during major transmission service intervals. This ensures the integrity of the connection and prevents potential leaks or failures.

Q3

Can I reuse the TG-81 transmission bolts after removal?

No, it is not recommended to reuse the TG-81 transmission bolts. These are often torque-to-yield (TTY) bolts, meaning they are designed for single use. Reusing them can compromise the clamping force and lead to transmission issues.

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 torque application

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

Socket Set

A set of sockets for various bolt sizes

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

Transmission Fluid Pressure Test Kit

A kit for testing transmission fluid pressure

  • Range: 0-100 bar
  • Accuracy: ± 1%
Learn more
Service Procedures

TG-81 Transmission Bolt Torque Specification

Procedure for applying correct torque to transmission bolts

  • Locate the transmission bolts
  • Apply the correct torque specification (see table)
  • Verify the torque specification using a torque wrench
View full procedure

Transmission Fluid Pressure Test

Procedure for testing transmission fluid pressure

  • Connect the transmission fluid pressure test kit
  • Start the engine and warm up the transmission
  • Take a reading of the transmission fluid pressure
View full procedure
Technical Service Bulletins

TG-81 Transmission Bolt Torque Specification Update

2020-02-15

Update to the torque specification for the TG-81 transmission bolts

2016-2020 Volvo S90

Resolution: Apply the updated torque specification to the transmission bolts

Transmission Fluid Pressure Test Kit Calibration

2019-05-01

Calibration procedure for the transmission fluid pressure test kit

2016-2020 Volvo S90

Resolution: Calibrate the transmission fluid pressure test kit according to the manufacturer's instructions

About the Author

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Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

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