Buick Envision 2016-2020 Drivetrain Bolt Torque Specifications & Fastener Values
Buick Envision 2016-2020

Buick Envision 2016-2020 Drivetrain Bolt Torque Specifications

Detailed torque specifications for drivetrain bolts on the 2016-2020 Buick Envision, including transmission, axles, and differential components. This guide provides 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

Search Specifications

Search by component name, bolt size, or description

Torque Calculator

Convert between different torque units

Transmission Mounting And Case

These components relate to mounting the transmission to the vehicle and securing its external housing components, such as the oil pan.

1

Transmission Mounting Bolts

M12 x 1.75
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Ensure proper alignment before tightening.
2

Transmission Oil Pan Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Tighten bolts in a criss-cross pattern. Do not overtighten.
3

Transmission Drain and Fill Plugs

M18 x 1.5
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Use new crush washers or seals.
4

Transmission Bell Housing Bolts

M12 x 1.75
Torque Value
50 ft-lbs (68 N·m)
Important Notes
Estimated torque, refer to manufacturer’s specification for the most accurate torque value. Ensure proper alignment before tightening.

Driveshaft And Axles

These components transmit power from the transmission to the wheels, including drive axles, CV joints, and the driveshaft itself (if applicable).

1

Drive Axle/Half Shaft Bolts

M10 x 1.5
Torque Value
118 ft-lbs (160 N·m)
Important Notes
Apply threadlocker. Ensure proper alignment.
2

CV Joint/Axle Nut

M24 x 1.5
Torque Value
118 ft-lbs (160 N·m)
Important Notes
Use new axle nut. Ensure wheel hub is correctly positioned.
3

Propeller/Drive Shaft Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Tighten bolts in a criss-cross pattern.

Differential And Transfer Case

These components relate to the differential(s) (front, rear, or both) and the transfer case in four-wheel-drive/all-wheel-drive vehicles.

1

Differential Drain/Fill Plug

M18 x 1.5
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Estimated torque, refer to the manufacturer’s specification for the most accurate torque value. Use new crush washers or seals.
2

Transfer Case Drain/Fill Plug

M18 x 1.5
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Estimated torque, refer to the manufacturer’s specification for the most accurate torque value. Use new crush washers or seals.
3

Differential Housing Mounting Bolts

M12 x 1.75
Torque Value
50 ft-lbs (68 N·m)
Important Notes
Estimated torque, refer to the manufacturer’s specification for the most accurate torque value. Tighten using a criss-cross pattern.
4

Front Differential Output Shaft Flange Bolts

M10 x 1.5
Torque Value
60 ft-lbs (81 N·m)
Important Notes
Estimated torque, refer to the manufacturer’s specification for the most accurate torque value. Use a criss-cross pattern.
5

Rear Differential Output Shaft Flange Bolts

M10 x 1.5
Torque Value
60 ft-lbs (81 N·m)
Important Notes
Estimated torque, refer to the manufacturer’s specification for the most accurate torque value. Use a criss-cross pattern.

Starter Motor

This includes the starter motor mounting bolts. Although the starter motor is primarily involved in engine starting, its mount is often integrated with the transmission bell housing. Thus, we are including it in the drivetrain category.

1

Starter Motor Mounting Bolts

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Ensure proper engagement of the starter motor pinion with the flywheel/flexplate.

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 crucial to use the correct torque specifications for drivetrain bolts?

Using the correct torque specifications ensures proper clamping force, preventing bolts from loosening due to vibration and stress. Insufficient torque can lead to component failure, while excessive torque can damage threads or weaken the bolt itself. For example, over-torquing a driveshaft bolt can cause it to stretch, making it susceptible to breakage.

Q2

What happens if I overtighten a drivetrain bolt?

Overtightening can strip threads in the component, stretch or break the bolt, and damage the gasket or sealing surface. If a bolt is over-torqued, it often requires professional repair to extract the broken bolt or repair the damaged threads which can be costly.

Q3

Can I reuse drivetrain bolts?

It is generally recommended to replace torque-to-yield bolts, which are often used in drivetrain applications, with new ones each time they are removed. These bolts are designed to stretch when tightened, and reusing them can compromise their integrity, leading to failure. Some standard bolts can be reused if they are in good condition, but replacing is always best practice.

Q4

Do I need special tools for tightening drivetrain bolts?

Yes, a properly calibrated torque wrench is essential to achieve accurate torque. Using an impact wrench or tightening by feel is not accurate and should not be done. Different sized sockets and possibly extensions may be required to access all the bolts. A torque angle meter may be needed for bolts with a torque + angle specification.

Q5

Where can I find the exact torque specifications for my 2016-2020 Buick Envision's drivetrain?

The most reliable source for torque specifications is the vehicle's service manual. These specifications are often available through your local dealership, online databases, or aftermarket service information providers. Always use the manual that is specific to your year and model.

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 inch Drive)

A 1/2 inch drive torque wrench capable of measuring torque in Newton-meters (Nm) or foot-pounds (lb-ft).

  • Accurate torque settings
  • Ratchet mechanism
  • Durable construction
Learn more

Torque Wrench (3/8 inch Drive)

A 3/8 inch drive torque wrench for smaller fasteners, also measuring in Nm or lb-ft.

  • Accurate torque settings
  • Ratchet mechanism
  • Smaller profile for tighter spaces
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets, including sizes needed for drivetrain bolts.

  • Chrome vanadium steel
  • Variety of sizes
  • Durable carrying case
Learn more

Extension Bars

Various length extension bars to access recessed bolts.

  • Durable metal construction
  • Multiple lengths
  • Secure locking mechanism
Learn more

Universal Joint

A universal joint adapter for accessing bolts at awkward angles.

  • Multiple angle adjustments
  • Durable steel construction
  • Secure grip
Learn more
Service Procedures

Driveshaft Bolt Torque Procedure

Procedure for properly torquing driveshaft bolts on 2016-2020 Buick Envision.

  • Locate all driveshaft bolts.
  • Clean the threads of each bolt and nut.
  • Apply a thin layer of anti-seize compound to the bolt threads (optional, but recommended).
  • Install each bolt, tightening by hand first to ensure no cross-threading.
  • Using the correct socket and torque wrench, torque the bolts in a star pattern to 65 Nm (48 lb-ft).
  • Double check each bolt with a final torque pass to confirm accuracy.
View full procedure

Axle Nut Torque Procedure

Procedure for properly torquing front axle nuts on a 2016-2020 Buick Envision.

  • Locate the front axle nuts on both sides of the vehicle.
  • Clean the threads of each axle nut.
  • Apply a thin layer of anti-seize compound to the nut threads (optional, but recommended).
  • Install each nut, tightening by hand first to ensure no cross-threading.
  • Using the correct socket and torque wrench, torque the nuts to 150 Nm (111 lb-ft) initially.
  • Rotate the nut an additional 60 degrees using a degree wheel or marked socket.
  • Double check each nut with a final torque pass to confirm accuracy.
View full procedure

Rear Differential Mounting Bolt Torque Procedure

Procedure for properly torquing rear differential mounting bolts on a 2016-2020 Buick Envision.

  • Locate the rear differential mounting bolts.
  • Clean the threads of each bolt.
  • Apply a thin layer of anti-seize compound to the bolt threads (optional, but recommended).
  • Install each bolt, tightening by hand first to ensure no cross-threading.
  • Using the correct socket and torque wrench, torque the bolts to 100 Nm (74 lb-ft).
  • Double check each bolt with a final torque pass to confirm accuracy.
View full procedure
Technical Service Bulletins

Rear Axle Nut Loosening Issues

2018-05-15

Some 2016-2017 Buick Envisions have experienced rear axle nut loosening, leading to noise and potential damage.

2016-2017

Resolution: Inspect and re-torque the rear axle nuts to specification. Apply threadlocker if looseness persists. Ensure proper torque procedure is followed.

Driveshaft Vibration at Highway Speeds

2019-11-20

Several 2017-2019 Buick Envision owners have reported vibrations at highway speeds, potentially related to incorrect driveshaft bolt torque.

2017-2019

Resolution: Inspect the driveshaft for damage. Re-torque driveshaft bolts to 65 Nm (48 lb-ft) using the proper torque sequence.

Front Axle Nut Click and Noise

2020-01-20

Reports have shown some 2018-2020 Buick Envision models may experience a click or noise from the front axle nut, potentially due to improper tightening.

2018-2020

Resolution: Verify the front axle nuts are torqued to 150 Nm (111 lb-ft) then rotated an additional 60 degrees. Apply threadlocker if issue persists.

About the Author

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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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