Buick Envision 2016-2020 2.0L Engine Bolt Torque Specifications & Fastener Values
Buick Envision 2016-2020

Buick Envision 2016-2020 2.0L Engine Bolt Torque Specifications

Comprehensive guide to torque specifications for various bolts on the 2.0L engine of the 2016-2020 Buick Envision. Includes cylinder head, main bearing, connecting rod, and other critical fasteners.

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

Cylinder Head

Components related to the cylinder head, including the head itself, camshafts, and valve train.

1

Cylinder Head Bolts

M12 x 1.75
Important Notes
Torque-to-yield bolts. Use a new set for reassembly. Torque to 18 ft-lbs, then turn an additional 90 degrees, and finally another 60 degrees, in sequence.
2

Camshaft Bearing Cap Bolts

M8 x 1.25
Torque Value
8.8 ft-lbs (12 N·m)
Important Notes
Typical value for M8 bolts into aluminum, confirm with service manual.
3

Rocker Arm/Shaft Bolts

M6 x 1.0
Torque Value
8.8 ft-lbs (12 N·m)
Important Notes
Ensure proper rocker arm alignment before tightening.
4

Valve Cover Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Tighten in a crisscross pattern. Do not over tighten to avoid damaging the valve cover.
5

Camshaft Sprocket Bolt

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Ensure camshaft timing is correct before tightening.

Crankcase

Components related to the engine block, crankshaft, connecting rods and oil pan.

1

Main Bearing Bolts

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Tighten in sequence as per the service manual.
2

Connecting Rod Nuts

M9 x 1.25
Important Notes
Torque-to-yield nuts. Use new nuts for reassembly. Torque to 37 ft-lbs, then turn an additional 90 degrees.
3

Oil Pan Bolts

M6 x 1.0
Torque Value
8.08 ft-lbs (11 N·m)
Important Notes
Tighten in a crisscross pattern. Do not over tighten to avoid damaging the oil pan gasket.
4

Oil Drain Plug Bolt

M14 x 1.5
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Use a new sealing washer, do not over tighten.
5

Crankshaft Pulley/Harmonic Balancer Bolt

M16 x 1.5
Torque Value
130 ft-lbs (176 N·m)
Important Notes
Ensure bolt is clean and lubed with engine oil.
6

Flywheel Bolts

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Apply thread locker to the bolts before tightening.

Timing System

Components that control the engine's timing.

1

Timing Belt/Chain Tensioner Bolt

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Ensure proper tensioner alignment before tightening.

Fuel And Intake

Components related to the air intake and fuel delivery.

1

Intake Manifold Bolts

M6 x 1.0
Torque Value
8.83 ft-lbs (12 N·m)
Important Notes
Tighten in sequence as per the service manual to prevent leaks.
2

Throttle Body Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Do not over tighten, ensure good sealing of gasket.
3

EGR Valve Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Tighten evenly to avoid leaks.
4

Fuel Rail Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Ensure fuel rail is properly aligned before tightening.
5

Fuel Injector Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
This torque spec is questionable, this likely applies to injector hold-down *clips*, rather than bolts, but is provided based on available information. Do not over-tighten, ensure proper seating.

Exhaust System

Components related to the exhaust system.

1

Exhaust Manifold/Headers Bolts

M10 x 1.5
Torque Value
26 ft-lbs (35 N·m)
Important Notes
Tighten in sequence, starting from the center and moving outward. Check for leaks.
2

Exhaust Manifold Studs into Cylinder Head

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
This is to confirm the previous *studs* specification, ensuring they are torqued to 18 ft-lbs (25 Nm).

Cooling System

Components related to engine cooling.

1

Water Pump Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Tighten evenly to avoid leaks.
2

Water Pump Pulley Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure pulley is aligned correctly.
3

Thermostat Housing Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Do not over tighten, ensure thermostat is properly seated.

Ignition System

Components related to the engine's ignition system.

1

Spark Plugs

M14 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Use a torque wrench with a spark plug socket.
2

Ignition Coil Bolt

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Ensure good contact with spark plugs.

Oil System

Components related to the engine's oil system.

1

Oil Filter Housing Bolt

M10 x 1.5
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Use new o-ring or gasket, do not over-tighten.

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 important to use the correct torque specifications?

Using the correct torque specifications is crucial to ensure proper clamping force. Overtightening can damage bolts, threads, or engine components, while under-tightening can lead to leaks, loosening, and component failure. For example, an improperly torqued cylinder head bolt could result in a blown head gasket. Always adhere to the specified values.

Q2

Should I use new bolts when reassembling the engine?

In many cases, yes. Certain bolts, like head bolts and connecting rod bolts on the 2.0L engine, are 'torque-to-yield' (TTY) bolts and are designed for one-time use. They stretch when tightened and should be replaced after being removed. Reusing them can lead to inaccurate torque readings and component failure. Always consult the service manual to determine which bolts need replacing.

Q3

What is the difference between 'Nm' and 'lb-ft' in torque specifications?

Nm stands for Newton-meters and lb-ft stands for pound-feet. They are both units of torque measurement. 1 lb-ft equals approximately 1.356 Nm. Torque wrenches usually display both units, but it is crucial to use the correct units to apply proper force during assembly. Misinterpreting the units can lead to significant under- or over-tightening, which could damage the engine.

Q4

How often should I check the torque of engine components?

Torque checks should be performed during specific maintenance procedures. For example, after changing the oil pan or timing chain cover you might want to recheck the torque specifications after the first drive cycle to ensure the bolts are properly seated. In general, unless there is a specific reason, like a leak, there's no need to check all bolts on a regular basis. However, some service manuals might specify a re-torque procedure after initial assembly, especially for new or recently repaired engines.

Q5

What tools do I need for torqueing engine bolts?

You will need a torque wrench, preferably of good quality to ensure accuracy. Depending on the size of the bolt, you'll also need a socket set. For some fasteners you may need a torque angle gauge if it's a 'torque-to-yield' application. Always make sure the torque wrench is calibrated and used according to the manufacturer's instructions. In addition, a good quality set of wrenches, ratchets, and extensions are crucial for proper torqueing.

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 calibrated torque wrench is essential for accurately tightening bolts to specification. 1/2 inch drive is suitable for most engine components.

  • Click-type mechanism
  • Wide torque range (e.g., 20-150 ft-lbs)
Learn more

Torque Wrench (3/8 inch drive)

A smaller torque wrench for lower torque applications.

  • Click-type mechanism
  • Lower torque range (e.g., 5-80 ft-lbs)
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets, including standard and deep sockets, in various sizes needed for engine components.

  • Various sizes (e.g., 8mm to 24mm)
  • 6-point and 12-point sockets
  • 1/2 inch and 3/8 inch drive options
Learn more

Socket Extensions

Extensions of varying lengths to access recessed bolts or areas where the torque wrench won't fit directly.

  • Various lengths (e.g., 3 inch, 6 inch, 10 inch)
  • 1/2 inch and 3/8 inch drive options
Learn more

Universal Joint Adapter

Allows the torque wrench to be used at an angle to reach difficult bolts.

  • 1/2 inch and 3/8 inch drive options
  • Provides angular flexibility
Learn more

Thread Cleaning Tools

Thread chaser or tap and die set to clean bolt holes before installation.

  • Metric sizes
  • Various styles
Learn more
Service Procedures

Cylinder Head Bolt Tightening Procedure

Detailed steps to properly torque the cylinder head bolts for the 2.0L engine.

  • Clean all bolt threads and holes
  • Install new cylinder head bolts.
  • Tighten all bolts in sequence (See specific torque sequence diagrams) to a first pass torque specification.
  • Tighten all bolts an additional 90 degree angle.
  • Tighten all bolts an additional 70 degree angle.
View full procedure

Connecting Rod Bolt Tightening Procedure

Detailed steps to properly torque the connecting rod bolts.

  • Clean all bolt threads and holes.
  • Install connecting rod bolts, ensure rod cap is installed correctly with mating surfaces.
  • Tighten all bolts to the first pass torque specification.
  • Tighten all bolts an additional angle rotation.
  • Verify all bolts are within specified torque and rotation parameters.
View full procedure

Intake Manifold Bolt Tightening Procedure

Detailed steps to properly torque the intake manifold bolts.

  • Clean all bolt threads and holes.
  • Install intake manifold and bolts.
  • Tighten all bolts in sequence (See specific torque sequence diagrams) to the first pass torque specification.
  • Tighten all bolts to the final torque specification.
View full procedure

Exhaust Manifold Bolt Tightening Procedure

Detailed steps to properly torque the exhaust manifold bolts.

  • Clean all bolt threads and holes.
  • Install exhaust manifold and bolts.
  • Tighten all bolts in sequence (See specific torque sequence diagrams) to the first pass torque specification.
  • Tighten all bolts to the final torque specification.
View full procedure
Technical Service Bulletins

Cylinder Head Bolt Re-torque Procedure Update

2018-06-15

Revised torque specifications for cylinder head bolts due to reported leaks. New bolts are recommended.

2016-2018

Resolution: Replace old bolts with updated bolts and follow the new torque procedure as outlined in the updated service manual.

Oil Pan Bolt Torque Specification Change

2019-03-20

Changed oil pan bolt torque due to oil leaks reported by dealers. New oil pan gaskets are required.

2017-2019

Resolution: Replace oil pan gasket and tighten oil pan bolts to the updated torque specification.

Updated Connecting Rod Bolt Procedure

2020-01-10

Updated the connecting rod bolt torque specification to a torque-to-yield procedure rather than a specific torque value. New bolts are required.

2019-2020

Resolution: Replace connecting rod bolts and follow the new torque-to-yield procedure as outlined in the updated service manual.

About the Author

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Alan Montanye - Automotive Technical Specialist
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Alan Montanye

Automotive Technical Specialist

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