Buick Encore 2013-2019 6T40 Transmission Transmission Torque Specifications & Bolt Torque Values
Buick Encore 2013-2019

Buick Encore 2013-2019 6T40 Transmission Torque Specifications

Detailed torque specifications for bolts on the 6T40 transmission found in the 2013-2019 Buick Encore, including case bolts, valve body bolts, and pan bolts.

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

Bolts securing the transmission to the engine block and/or vehicle frame/subframe.

1

Transmission Mounting Bolts

M12 x 1.75
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Ensure proper alignment before tightening. These bolts are critical for structural integrity.

Transmission Case

Bolts used to join various sections of the transmission case.

1

Transmission Case Bolts (General)

M10 x 1.5
Torque Value
35 ft-lbs (47 N·m)
Important Notes
This is a general specification; individual bolt torques may vary. Ensure case halves are properly aligned.

Transmission Oil Pan

Bolts securing the transmission oil pan to the transmission case.

1

Transmission Oil Pan Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Proper torque is critical to achieving a leak-free seal. Do not over-tighten.

Transmission Drain Fill Plugs

Plugs used for draining and filling transmission fluid.

1

Transmission Drain/Fill Plugs

M18 x 1.5
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Use a new seal or gasket for the plugs to prevent leaks.

Drive Axle Components

Bolts and nuts relating to the attachment of the drive axles to the transmission.

1

Drive Axle/Half Shaft Bolts

M10 x 1.5
Torque Value
74 ft-lbs (100 N·m)
Important Notes
Ensure proper seating of the axle to the transmission output flange before tightening.
2

CV Joint/Axle Nut

M24 x 1.5
Torque Value
118 ft-lbs (160 N·m)
Important Notes
This nut is located at the wheel hub. Proper torque is crucial for the entire drive shaft system.

Transmission Internal Components

Bolts associated with internal components of the transmission.

1

Valve Body Bolts

M6 x 1.0
Torque Value
8.8 ft-lbs (12 N·m)
Important Notes
Over-tightening could damage the valve body or cause internal leaks.
2

Pressure Sensor Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Proper torque ensures accurate sensor readings. Do not over-tighten.

Transmission Control Module

Bolts securing the TCM to the transmission case.

1

Transmission Control Module (TCM) Mounting Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Ensure proper seating of the module to the transmission case. Do not over-tighten.

Transmission Range Sensor

Bolts securing the TRS or manual shaft lever.

1

Transmission Range Sensor (TRS) / Manual Shaft Lever Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Ensure smooth lever operation after installation. Do not over-tighten.

Torque Converter

Bolts securing the torque converter to the flexplate.

1

Torque Converter Bolts (To Flexplate)

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Use the correct torque pattern as specified by the manufacturer. These bolts may be torque to yield and require replacement after removal.

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

Why is it critical to use the correct torque specifications on the 6T40 transmission?

Using incorrect torque specifications on the 6T40 transmission can lead to various problems. Under-torquing fasteners can cause leaks, loosening, and component failure due to insufficient clamping force. Over-torquing can strip threads, damage gaskets, deform components, and potentially lead to premature failure. For example, over-torquing the transmission pan bolts can crush the gasket, causing a fluid leak, while under-torquing the valve body bolts could result in incorrect fluid pressure and shifting problems.

Q2

What type of thread locker, if any, should be used on the 6T40 transmission bolts?

The use of thread locker depends on the specific bolt and its location within the 6T40 transmission. Generally, bolts that are subject to vibration or thermal cycling benefit from a medium-strength (e.g., Loctite 242) thread locker to prevent loosening. For example, bolts on the valve body and transmission case may benefit from thread locker. Consult the service manual for specific recommendations, as some bolts, like those on the transmission pan, do not typically require it.

Q3

How often should I inspect the 6T40 transmission for leaks and loose bolts?

Regular inspection is crucial. A good practice is to inspect the transmission for leaks and visually check the tightness of accessible bolts during each oil change, or at least every 6 months/6,000 miles, whichever comes first. Early detection of a leak, or loose bolt, can prevent major and costly repairs down the road. For instance, if a pan bolt loosens and begins to leak, quickly addressing this issue with a torque wrench and new gasket can prevent costly damage to the transmission.

Q4

What is the proper procedure for cleaning mating surfaces before assembling the 6T40 transmission?

Proper cleaning of mating surfaces is essential for a leak-free seal. Use a scraper to remove any old gasket material carefully. Avoid gouging or scratching the mating surfaces. Clean with a non-abrasive solvent such as brake cleaner, and wipe dry with a lint-free cloth. A clean surface ensures proper contact and minimizes the chances of leaks. For example, when replacing the transmission side cover, ensure both the case and cover are spotless before applying sealant.

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 (1/2" Drive)

A 1/2" drive torque wrench capable of measuring torque values within the range specified for the 6T40 transmission.

  • Click-type mechanism for accurate torque application
  • Wide torque range to cover all fastener specifications
  • Clearly marked scale for easy reading
Learn more

Torque Wrench (3/8" Drive)

A 3/8" drive torque wrench for smaller bolts and tighter spaces.

  • Smaller head for better access
  • Click-type mechanism for accurate torque application
  • Clearly marked scale for easy reading
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets, including sizes required for 6T40 transmission bolts.

  • Various sizes to fit all bolts
  • Durable construction for long-lasting use
  • Clearly marked socket sizes
Learn more

Extension Bars

Various lengths of extension bars for reaching recessed bolts.

  • Multiple lengths for different applications
  • Durable construction
  • Provides access to recessed areas
Learn more

Universal Joint (U-Joint)

A universal joint allows access to bolts at awkward angles.

  • Swivel action for angled access
  • Durable construction
  • Compatible with common socket sizes
Learn more
Service Procedures

6T40 Transmission Pan Bolt Torque Procedure

Procedure for properly tightening the transmission pan bolts on a 6T40 transmission. Ensures proper sealing and prevents leaks.

  • Clean the transmission pan and the mating surface of the transmission case thoroughly.
  • Install the transmission pan gasket and position the pan.
  • Install all the pan bolts by hand initially, ensuring they are all engaged properly.
  • Using a torque wrench with the correct socket, torque the bolts in a crisscross pattern in three passes to the following torque value 10 N·m (89 lb in) first pass, 15 N·m (11 lb ft) second pass, then 20 N·m (15 lb ft) final pass, starting in the center and working outwards. Ensure you allow the proper amount of time between passes. Do not over torque the bolts.
  • Verify all bolts are torqued to specification.
View full procedure

6T40 Valve Body Bolt Torque Procedure

Procedure for properly tightening the valve body bolts on a 6T40 transmission. Ensures proper function and prevents leaks.

  • Clean the valve body and the mating surface of the transmission case thoroughly.
  • Install the valve body and all bolts by hand.
  • Using a torque wrench with the correct socket, torque the bolts in a crisscross pattern in two passes to the following torque value 5 N·m (44 lb in) first pass, then 10 N·m (89 lb in) final pass, starting in the center and working outwards. Ensure you allow the proper amount of time between passes. Do not over torque the bolts.
  • Verify all bolts are torqued to specification.
View full procedure

6T40 Transmission Control Module (TCM) Bolt Torque Procedure

Procedure for properly tightening the transmission control module bolts on a 6T40 transmission.

  • Clean the TCM and the mating surface of the transmission case thoroughly.
  • Install the TCM and all bolts by hand.
  • Using a torque wrench with the correct socket, torque the bolts to 8 N·m (71 lb in).
  • Verify all bolts are torqued to specification.
View full procedure

6T40 Transmission Case Bolts Torque Procedure

Procedure for properly tightening the main case bolts on a 6T40 transmission.

  • Clean the transmission case surfaces before assembly.
  • Install all case bolts by hand initially.
  • Using a torque wrench with the correct socket, torque the bolts in a crisscross pattern to 50 N·m (37 lb ft) using three passes, starting in the center and working outwards. Ensure you allow the proper amount of time between passes. Do not over torque the bolts.
  • Verify all bolts are torqued to specification.
View full procedure
Technical Service Bulletins

6T40 Transmission - Fluid Leak at Pan Gasket

2016-03-15

Some vehicles may exhibit transmission fluid leaks at the transmission pan gasket. Improper torque of pan bolts can lead to leaks.

2013-2016

Resolution: Inspect the transmission pan for warping and replace if necessary. Ensure proper torque sequence is followed during pan installation. Verify with the torque procedure.

6T40 - Harsh Shift and Error Codes

2018-09-22

Reports of harsh shifts and error codes may be linked to loose or improperly torqued valve body bolts.

2017-2019

Resolution: Verify the torque of all valve body bolts according to the specified procedure. Check for proper installation of the valve body and components.

About the Author

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Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

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