Buick Verano 2012-2017 6T40 Transmission Transmission Torque Specifications & Bolt Torque Values
Buick Verano 2012-2017

Buick Verano 2012-2017 6T40 Transmission Torque Specifications

Detailed torque specifications for all bolts related to the 6T40 transmission in the 2012-2017 Buick Verano. Includes bell housing, pan, and other relevant component bolt torques.

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 Case And Housing

Fasteners related to the main structure of the transmission, including the case, side cover, and fluid pan. Proper torque is crucial for preventing leaks and maintaining structural integrity.

1

Transmission Case Bolts

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Tighten in a cross pattern in multiple stages to ensure even clamping pressure. Estimated value based on industry standard.
2

Transmission Side Cover Bolts

M8 x 1.25
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Tighten in a cross pattern. Estimated value based on similar applications.
3

Valve Body Mounting Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Tighten in a cross pattern. Over-tightening can damage the valve body. Estimated value based on industry standard.
4

Transmission Fluid Pan Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Tighten in a cross pattern. Ensure even seal compression to prevent leaks. Estimated value based on industry standard.
5

Transmission Mount Bolts to Case

M12 x 1.75
Torque Value
60 ft-lbs (81 N·m)
Important Notes
Safety-critical fastener. Estimated based on similar GM transmission applications and bolt size.

Internal Components

Fasteners related to internal transmission parts, including shafts, supports, solenoids, and filters. Proper torque is essential for component alignment and function.

1

Input Shaft Support Bolts

M8 x 1.25
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Estimated value based on similar GM transmission applications and bolt size.
2

Output Shaft Support Bolts

M8 x 1.25
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Estimated value based on similar GM transmission applications and bolt size.
3

Control Valve Solenoid Mounting Bolts

M5 x 0.8
Torque Value
5.2 ft-lbs (7 N·m)
Important Notes
Correct torque is crucial for proper solenoid operation. Estimated value based on industry standard.
4

Park Pawl Bracket Bolts

M8 x 1.25
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Estimated value based on similar GM transmission applications and bolt size.
5

Internal Filter Mounting Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Ensure filter is properly seated before tightening. Estimated value based on similar GM transmission applications and bolt size.

External Components

Fasteners for external components such as sensors, cooler lines, and fittings. Proper torque is essential for reliable connections and preventing leaks.

1

Transmission Range Sensor Bolts

M5 x 0.8
Torque Value
5.2 ft-lbs (7 N·m)
Important Notes
Over-tightening can damage the sensor. Estimated value based on industry standard.
2

Transmission Fluid Cooler Line Fittings

N/A
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Use a backup wrench on the fitting to prevent damage. Estimated value based on industry standard for similar fittings. Check specific fitting type for torque specification.
3

Transmission Cooler Lines to Radiator Mounting Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Ensure proper alignment of cooler lines. Estimated value based on industry standard.

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 using the correct torque specification critical for the 6T40 transmission?

Using the correct torque specification is crucial because it ensures proper clamping force between components. Over-tightening can strip threads, deform components, or cause premature failure of bolts and gaskets, leading to leaks or internal damage. Under-tightening can result in joint loosening, vibrations, fluid leaks, and potential mechanical failure of the transmission. For example, a pan bolt tightened incorrectly can lead to a significant transmission fluid leak, requiring immediate repair.

Q2

What happens if I over-torque the valve body bolts on the 6T40 transmission?

Over-torquing the valve body bolts can easily distort the valve body casting. Since the valve body contains sensitive fluid channels and precisely machined components, distortion can cause valves to stick, resulting in erratic shifting, slipping, or complete loss of gear engagement. This can necessitate a costly valve body replacement. Also, over-tightening can crack the valve body and require the whole transmission to be replaced.

Q3

Do I need to replace bolts when servicing the 6T40 transmission, specifically the pan bolts?

While not always mandatory, it's highly recommended to replace pan bolts, especially if they are stretch bolts or show any signs of corrosion or damage. Reusing old bolts can lead to inconsistent clamping force and potential leaks. Consider replacing the filter with every service, as well, as the transmission fluid filter is a non-serviceable part.

Q4

Can I use thread locker on transmission bolts?

Thread locker is generally not recommended for most 6T40 transmission bolts unless specifically specified in the service manual for your 2012-2017 Buick Verano. Over application can make it difficult to remove the bolts in the future, and interfere with torque settings. Clean threads are important for accurate torque readings.

Q5

What type of torque wrench should I use when working on the 6T40?

A calibrated torque wrench is essential for accurately tightening transmission bolts. A click-type or beam-type torque wrench is acceptable, but a digital torque wrench provides the most precision. Ensure the torque wrench is in the correct range for the specifications you are using. Always be mindful of the torque wrench’s range, and use a wrench that can accurately apply the specified torque without exceeding its limit.

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 calibrated torque wrench is essential for applying accurate torque to transmission bolts.

  • Measures torque in ft-lbs or Nm
  • Click-type or digital display
  • 1/2 inch drive for common bolt sizes
Learn more

Torque Wrench (3/8" Drive)

A smaller torque wrench for tighter spaces and bolts with lower torque specifications.

  • Measures torque in ft-lbs or Nm
  • Click-type or digital display
  • 3/8 inch drive for smaller bolts
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets to fit all bolts on the 6T40 transmission.

  • Various sizes from 8mm to 19mm
  • 6-point sockets for secure grip
  • 1/2 inch and 3/8 inch drive options
Learn more

Extension Bars

Used with sockets to access recessed bolts on the transmission.

  • Various lengths for different access needs
  • 1/2 inch and 3/8 inch drive options
  • Durable steel construction
Learn more

Universal Joint Adapter

Enables torque application at an angle where straight access is not possible.

  • 1/2 inch and 3/8 inch drive options
  • Durable steel construction
  • Allows for flexible angles
Learn more
Service Procedures

6T40 Transmission Pan Bolt Torque Procedure

Procedure for properly torquing the transmission pan bolts after service.

  • Clean the transmission pan and mating surfaces.
  • Install new transmission pan gasket.
  • Install the transmission pan bolts by hand.
  • Tighten bolts in a cross pattern to 10 Nm (89 in-lbs).
  • Re-torque the bolts following the same cross pattern to 14 Nm (10 ft-lbs).
  • Verify no leaks upon initial operation.
View full procedure

6T40 Transmission Control Valve Body Bolt Torque Procedure

Procedure for properly torquing the valve body bolts.

  • Install the control valve body, ensuring it is properly aligned.
  • Install the control valve body bolts by hand.
  • Tighten the bolts in a cross pattern to 8 Nm (71 in-lbs).
  • Re-torque the bolts following the same cross pattern to 10 Nm (89 in-lbs).
  • Verify proper valve body function after torquing.
View full procedure

6T40 Transmission Case Bolts Torque Procedure

Procedure for properly torquing the transmission case bolts.

  • Clean the transmission case and mating surfaces.
  • Install the transmission case bolts by hand.
  • Tighten the bolts in a cross pattern to 20 Nm (15 ft-lbs).
  • Re-torque the bolts following the same cross pattern to 25 Nm (18 ft-lbs).
  • Verify no leaks upon initial operation.
View full procedure
Technical Service Bulletins

6T40 Transmission Fluid Leak at Pan

2013-05-15

Reports of transmission fluid leaks originating from the transmission pan gasket due to improper torque.

2012-2013 Buick Verano

Resolution: Inspect pan for flatness, replace gasket, and follow proper torque procedure (10 Nm (89 in-lbs), then 14 Nm (10 ft-lbs) in cross pattern).

6T40 Valve Body Bolt Loosening

2015-11-20

Reports of loose valve body bolts causing transmission shifting issues due to vibration.

2014-2015 Buick Verano

Resolution: Inspect and re-torque valve body bolts to 10 Nm (89 in-lbs), follow proper cross-pattern tightening sequence. Consider applying thread locker.

6T40 Transmission Case Bolt Fatigue

2017-03-10

Reports of transmission case bolts experiencing fatigue and potential shearing from over-torquing during service.

2016-2017 Buick Verano

Resolution: Always use a calibrated torque wrench and follow the proper torque specifications (20 Nm (15 ft-lbs), then 25 Nm (18 ft-lbs) in a cross pattern).

About the Author

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Alan Montanye - Automotive Technical Specialist
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Alan Montanye

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