Buick Envision 2016-2020 2.5L Engine Bolt Torque Specifications & Fastener Values
Buick Envision 2016-2020

Buick Envision 2016-2020 2.5L Engine Bolt Torque Specifications

Detailed torque specifications for various bolts on the 2.5L engine found in the 2016-2020 Buick Envision. Includes cylinder head, connecting rod, main bearing, 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

Fasteners associated with securing the cylinder head to the engine block. Proper torque and sequence are critical for maintaining combustion chamber sealing.

1

Cylinder Head Bolts

M10 x 1.5
Important Notes
Follow the manufacturer's recommended torque sequence. Tighten in a criss-cross pattern.

Engine Block

Fasteners associated with the engine block, crankshaft, and rotating assembly.

1

Main Bearing Bolts

M12 x 1.75
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Tighten main bearing bolts in the manufacturer's specified sequence. Ensure proper bearing alignment before torquing.
2

Connecting Rod Nuts

M9 x 1.25
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Ensure connecting rod bearings are properly lubricated before assembly. Torque all connecting rod nuts equally.
3

Flywheel Bolts

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Torque flywheel bolts in a star pattern to evenly distribute clamping force.
4

Oil Pan Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Torque oil pan bolts in a criss-cross pattern to ensure even gasket compression. Convert 97 inch-lbs to 8 ft-lbs
5

Oil Filter Housing Bolt

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure proper alignment of the oil filter housing before torquing.
6

Oil Drain Plug Bolt

M14 x 1.5
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Use a new crush washer every time the oil drain plug is removed.

Valvetrain

Fasteners associated with the valve cover, camshafts, rocker arms, and related components.

1

Valve Cover Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Torque valve cover bolts in a criss-cross pattern. Convert 89 inch-lbs to 7 ft-lbs
2

Timing Belt/Chain Tensioner Bolt

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Ensure proper tensioner function before fully torquing the bolt.
3

Camshaft Sprocket Bolt

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Ensure the camshaft sprocket is properly aligned with the timing marks before torquing.
4

Rocker Arms/Shafts Bolts

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Torque rocker arm bolts evenly. Convert 106 inch-lbs to 9 ft-lbs
5

Camshaft Bearing Cap Bolts

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Torque camshaft bearing cap bolts in a specified sequence.

Intake System

Fasteners associated with the intake manifold, throttle body, EGR valve and related components.

1

Throttle Body Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Torque throttle body bolts evenly. Convert 89 inch-lbs to 7 ft-lbs
2

Intake Manifold Bolts

M8 x 1.25
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Torque intake manifold bolts in a specified sequence. Convert 106 inch-lbs to 9 ft-lbs
3

EGR Valve Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Torque EGR valve bolts evenly. Convert 89 inch-lbs to 7 ft-lbs
4

Fuel Rail Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Torque fuel rail bolts evenly. Convert 89 inch-lbs to 7 ft-lbs

Exhaust System

Fasteners associated with the exhaust manifold, headers, and related components.

1

Exhaust Manifold/Headers Bolts

M8 x 1.25
Torque Value
26 ft-lbs (35 N·m)
Important Notes
Tighten exhaust manifold bolts in a specified sequence, usually from the center out.
2

Exhaust Manifold/Headers to Cylinder Head Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Tighten exhaust manifold bolts in a specified sequence.

Ignition System

Fasteners associated with the spark plugs and ignition coils.

1

Spark Plugs

M14 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Ensure spark plugs are properly gapped and have anti-seize on the threads. Do not overtighten.
2

Ignition Coil Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Torque ignition coil bolts evenly. Convert 89 inch-lbs to 7 ft-lbs

Fuel System

Fasteners related to the fuel injectors.

1

Fuel Injector Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Torque fuel injector bolts evenly. Convert 89 inch-lbs to 7 ft-lbs

Cooling System

Fasteners associated with the water pump, thermostat housing, and coolant temperature sensor.

1

Water Pump Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Torque water pump bolts evenly. Convert 89 inch-lbs to 7 ft-lbs
2

Water Pump Pulley Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Torque water pump pulley bolts evenly.
3

Thermostat Housing Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Torque thermostat housing bolts evenly. Convert 89 inch-lbs to 7 ft-lbs
4

Coolant Temperature Sensor

M10 x 1.0
Torque Value
11 ft-lbs (15 N·m)
Important Notes
Ensure proper sealing of the coolant temperature sensor. Do not overtighten.

Miscellaneous

Fasteners for components not included in other systems, such as sensors and accessories.

1

Knock Sensor Bolt

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Torque the knock sensor bolt to ensure proper sensor operation.
2

Crankshaft Pulley/Harmonic Balancer Bolt

M14 x 1.5
Torque Value
130 ft-lbs (176 N·m)
Important Notes
Use a crankshaft holding tool to prevent rotation when torquing.
3

Power Steering Pump Mounting Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure proper alignment of the power steering pump before torquing.

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 are torque specifications so important for the 2.5L engine?

Correct torque is crucial for the 2.5L engine to ensure proper clamping force, preventing leaks and component failure. Over-tightening can damage threads or warp components, while under-tightening can lead to loosening over time, causing leaks and potential engine damage. For instance, head bolts require precise torque to seal the combustion chamber correctly; improper torque could lead to head gasket failure.

Q2

What happens if I don't use a torque wrench?

Using a torque wrench is highly recommended. Without it, it’s difficult to achieve the correct tightness. 'Feel' alone is unreliable and can result in over or under-tightening. For example, an oil pan bolt that is too tight can damage the threads in the block and create leaks. Conversely, one that's too loose can fall out over time.

Q3

Are there any bolts that require special tightening procedures on the 2.5L engine?

Yes, several bolts, particularly head bolts and connecting rod bolts, require a specific torque sequence and/or angle-tightening procedure, which is often specified in the service manual. This ensures even clamping pressure across the component. Ignoring these sequences can result in uneven pressure, causing warpage or leaks, especially with the engine cylinder head.

Q4

Where can I find the correct torque specifications if I don’t have the service manual?

You can typically find the specifications in a repair manual specific to the 2016-2020 Buick Envision or through reputable online databases. However, it is critical to cross-reference the information with other reliable resources or the OEM service manual due to the potential for inaccuracies or variations. For a critical component, it's best to consult a mechanic.

Q5

How often should I check the torque on the engine bolts?

Generally, bolts tightened to the proper specifications don't need routine checking, however, it is good practice to double-check torque after a major component replacement or any time a bolt has been loosened. Specifically, during engine rebuilds, head bolts should be re-torqued after initial run in, as the gasket may compress and lead to a reduction in clamping force.

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 achieving accurate bolt torque specifications. A 1/2-inch drive is generally suitable for most engine components.

  • Calibrated for accurate readings
  • Wide torque range (e.g., 20-200 lb-ft)
  • Durable construction
Learn more

Torque Wrench (3/8-inch Drive)

A 3/8-inch drive torque wrench is useful for smaller fasteners and areas with limited space.

  • Calibrated for accurate readings
  • Lower torque range (e.g., 5-80 lb-ft)
  • Compact design
Learn more

Socket Set (1/2-inch and 3/8-inch Drive, Metric)

A comprehensive set of metric sockets is necessary for accessing the various bolts on the 2.5L engine.

  • Wide range of metric sizes
  • 6-point sockets for secure grip
  • Durable chrome vanadium steel
Learn more

Socket Extensions (Various Lengths)

Extensions are needed to reach recessed or hard-to-access bolts.

  • Varying lengths for versatility
  • Durable construction
  • Secure connection
Learn more

Universal Joint

A universal joint allows you to apply torque at an angle when a straight-on approach is not possible.

  • Flexible angle adjustment
  • Durable build
Learn more
Service Procedures

Cylinder Head Bolt Torque Procedure (2.5L Engine)

This procedure outlines the correct steps for torquing the cylinder head bolts on the 2.5L engine. Improper torque can lead to head gasket failure.

  • Clean the cylinder head bolt holes.
  • Lubricate the cylinder head bolts with clean engine oil.
  • Install the cylinder head bolts in the correct sequence.
  • Torque all bolts to 22 lb-ft.
  • Loosen all bolts, turn them out completely then tighten to 22lb-ft.
  • Tighten all bolts an additional 70 degrees.
  • Perform the final 70-degree torque in the same tightening sequence.
View full procedure

Intake Manifold Bolt Torque Procedure (2.5L Engine)

This procedure details the correct sequence and torque specifications for the intake manifold bolts. Ensure proper sealing to prevent vacuum leaks.

  • Clean the intake manifold mating surfaces.
  • Install the intake manifold gasket.
  • Install the intake manifold bolts in the correct sequence.
  • Tighten all bolts to 17 lb-ft using an in-out sequence.
View full procedure

Exhaust Manifold Bolt Torque Procedure (2.5L Engine)

Proper exhaust manifold bolt torque ensures a leak-free exhaust system. Use the specific procedure and torque specification for this engine.

  • Clean the exhaust manifold mating surfaces.
  • Install a new exhaust manifold gasket.
  • Install the exhaust manifold bolts in the correct sequence.
  • Tighten all bolts to 18 lb-ft using an in-out sequence.
View full procedure

Connecting Rod Bolt Torque Procedure (2.5L Engine)

This procedure details the correct steps for torquing the connecting rod bolts on the 2.5L engine. Improper torque can lead to engine failure.

  • Clean the connecting rod bolts and caps.
  • Lubricate the connecting rod bolt threads with clean engine oil.
  • Install the connecting rod cap and bolts.
  • Torque all bolts to 22 lb-ft.
  • Tighten all bolts an additional 70 degrees.
View full procedure

Crankshaft Main Bearing Cap Bolt Torque Procedure (2.5L Engine)

This procedure outlines the correct steps for torquing the main bearing cap bolts on the 2.5L engine. Improper torque can lead to engine failure.

  • Clean the main bearing bolts and cap mating surfaces.
  • Lubricate the main bearing bolt threads with clean engine oil.
  • Install the main bearing caps in the correct sequence.
  • Torque the outer bolts to 18 lb-ft.
  • Torque the inner bolts to 18 lb-ft.
  • Tighten all outer bolts an additional 80 degrees.
  • Tighten all inner bolts an additional 50 degrees.
View full procedure

Camshaft Cap Bolt Torque Procedure (2.5L Engine)

This procedure outlines the correct steps for torquing the camshaft cap bolts on the 2.5L engine. Improper torque can lead to engine failure.

  • Clean the camshaft bearing cap bolts and mating surfaces.
  • Lubricate the camshaft bearing cap bolt threads with clean engine oil.
  • Install the camshaft bearing caps in the correct sequence.
  • Tighten all bolts to 7 lb-ft.
View full procedure
Technical Service Bulletins

Engine Oil Consumption Concerns - 2.5L Engine

2018-05-10

Some 2016-2018 Buick Envision models with the 2.5L engine may experience increased engine oil consumption. This could be related to various internal engine components including piston rings.

2016-2018

Resolution: Inspect for oil leaks, valve seals and perform compression and leakdown tests. Replace piston rings if necessary.

Cylinder Head Bolt Failure - 2.5L Engine

2019-11-15

Reports indicate instances of cylinder head bolt failure in certain 2017-2019 Buick Envision models using the 2.5L engine. Bolt stretching due to over torque or use of improper bolts during prior service may be the cause.

2017-2019

Resolution: Inspect the cylinder head bolts for stretching or damage. Use new recommended bolts and torque specifications listed in this document during any service.

Intake Manifold Gasket Leak - 2.5L Engine

2020-02-28

Some 2018-2020 Buick Envision vehicles may develop a leak at the intake manifold gasket. This may be a result of improper installation or worn gasket materials.

2018-2020

Resolution: Check the intake manifold gasket for leaks. Replace the gasket with a new one and torque all bolts to 17 lb-ft using an in-out sequence.

About the Author

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Alan Montanye - Automotive Technical Specialist
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Alan Montanye

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Technical Information
  • All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
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