Buick Vehicle Models Envision 2021-present Torque Specifications
Buick Vehicle Models Envision 2021-present

Buick Vehicle Models Envision 2021-present Torque Specifications

Complete Buick Vehicle Models Envision 2021-present torque specifications guide. Includes factory-specified torque values, torque sequences, and technical specifications for all components including body, brakes, drivetrain, electrical, emissions sensors, fuel, exhaust, HVAC, and suspension. 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

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Torque Calculator

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2.0l Engine

Torque specifications for 2.0L Engine

Cylinder Head

1

Cylinder Head Bolts

M12 x 1.75
Torque Specification
1. 18 ft-lbs (25 N·m) 2. 90°
Important Notes
Use a new set of bolts. Follow the manufacturer's specified torque sequence. Torque to the specified value, then turn an additional 90 degrees using an angle gauge.
2

Cylinder Head Cover Bolts/Studs

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Tighten in a cross pattern from the center out to ensure even gasket compression. Do not overtighten to avoid damaging the cover.
3

Valve Cover Bolts

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Tighten in a criss-cross pattern from the center out to ensure even gasket compression.
4

Rocker Arms/Shafts Bolts

M8 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Ensure the bolts are properly seated before tightening. Confirm torque applied is to the rocker arm fasteners, not any other hardware.
5

Camshaft Sprocket Bolt

M10 x 1.5
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Use new bolts if specified by the manufacturer. Secure the sprocket before applying final torque. May require a special tool to hold the camshaft.
6

Variable Valve Timing (VVT) Solenoid Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Do not overtighten to avoid damaging the solenoid. Tighten evenly.

Engine Block

1

Main Bearing Bolts

M12 x 1.75
Torque Specification
1. 37 ft-lbs (50 N·m) 2. 60°
Important Notes
Use new bolts if specified. Follow a specific torque sequence, usually from the center outwards. Torque to the specified value, then turn an additional 60 degrees using an angle gauge.
2

Connecting Rod Nuts

M9 x 1.25
Torque Specification
1. 20 ft-lbs (27 N·m) 2. 45°
Important Notes
Use new nuts. Follow the specified torque sequence. Torque to the specified value, then turn an additional 45 degrees using an angle gauge.
3

Crankshaft Pulley/Harmonic Balancer Bolt

M14 x 1.5
Torque Specification
1. 74 ft-lbs (100 N·m) 2. 90°
Important Notes
Use a new bolt. Torque to the specified value, then turn an additional 90 degrees using an angle gauge. May require a special tool to hold the crankshaft.
4

Oil Pan Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Tighten in a cross pattern from the center out to ensure even gasket compression. Avoid over-tightening.
5

Oil Filter Housing Bolt

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure the filter housing is properly seated before applying final torque. Check the O-ring for damage before installation.
6

Oil Drain Plug Bolt

M14 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Use a new crush washer to ensure a good seal. Do not overtighten to avoid damaging the oil pan threads.

Intake Exhaust

1

Intake Manifold Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Follow the manufacturer's specified torque sequence. Tighten bolts gradually in a criss-cross pattern from the center out.
2

Throttle Body Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Do not overtighten the bolts to avoid damaging the throttle body. Make sure the throttle body gasket is installed correctly.
3

Exhaust Manifold/Headers Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Tighten bolts from the center out in a cross pattern to avoid distortion. Use new gaskets if required.
4

EGR Valve Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure that the EGR valve is properly aligned before final tightening. Check the gasket before installation.

Fuel System

1

Fuel Rail Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Do not overtighten to avoid damage to fuel rail or intake manifold. Ensure the fuel rail is properly seated.
2

Fuel Injector Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Ensure the injectors are properly seated and the O-rings are in good condition.

Cooling System

1

Water Pump Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure the water pump is properly seated and use a new gasket. Tighten bolts evenly.
2

Water Pump Pulley Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Tighten the bolts evenly to avoid putting the pulley off center.
3

Thermostat Housing Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure the thermostat is installed correctly, and use a new gasket. Tighten the bolts evenly.
4

Coolant Temperature Sensor

M12 x 1.5
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
This is a hand-tighten plus 1/4 turn or a low specified torque value. Do not overtighten. Estimated value.

Timing System

1

Timing Belt/Chain Tensioner Bolt

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure the tensioner is properly aligned before applying final torque.

Accessory Drive

1

Serpentine/Accessory Drive Belt Tensioner Bolt

M10 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Make sure the tensioner is aligned properly before applying torque.
2

Drive Belt Idler Pulley Bolt

M10 x 1.5
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Ensure that the idler pulley is properly seated before tightening the bolt.

Sensors

1

Camshaft Position Sensor Bolt

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Do not overtighten the bolt to avoid damage to the sensor. Ensure the sensor is properly seated.
2

Knock Sensor Bolt

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure the sensor is properly seated to the engine block or cylinder head for correct function. Estimated Value.
3

Crankshaft Position Sensor Bolt

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Do not overtighten to avoid damage to the sensor. Ensure the sensor is properly seated.
4

Oil Pressure Sensor

M10 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
This is a hand-tighten plus 1/4 turn or a low specified torque value. Do not overtighten. Estimated value.

Ignition

1

Spark Plugs

M14 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Do not overtighten to avoid damaging the cylinder head threads. Make sure the spark plugs are properly threaded by hand before using the torque wrench.
2

Ignition Coil Bolt

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Do not overtighten to avoid damaging the coil. Make sure it's seated properly before tightening.

Power Steering

1

Power Steering Pump Mounting Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure the pump is properly seated on the bracket before tightening.

Forced Induction

1

Turbocharger/Supercharger Mounting Bolts

M10 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Estimated Value. Tighten bolts in a cross pattern for even torque distribution.
2

Turbocharger Oil Feed Line and Drain Line Bolt/Fitting

M8 x 1.0
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure new sealing washers are used. Do not overtighten. Estimated value.

9t50 Transmission

Torque specifications for 9t50 Transmission

Transmission Mounting

1

Transmission Mounting Bolts

M12 x 1.75
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Ensure all mounting surfaces are clean before installation. Use new bolts if specified by the manufacturer.

Transmission Case

1

Transmission Case Bolts (M8)

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Tighten bolts in a crisscross pattern to ensure even clamping force.
2

Transmission Case Bolts (M10)

M10 x 1.5
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Tighten bolts in a crisscross pattern to ensure even clamping force.

Transmission Oil Pan

1

Transmission Oil Pan Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Tighten bolts in a crisscross pattern starting from the center and working outwards. Do not over-tighten to avoid gasket damage.

Transmission Plugs

1

Transmission Drain and Fill Plugs

M18 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure the sealing washer or o-ring is in good condition. Do not over-tighten to prevent damage to the plug or case threads.

Drivetrain Connections

1

Drive Axle/Half Shaft Bolts

M10 x 1.5
Torque Specification
118 ft-lbs (160 N·m)
Important Notes
Ensure that the bolts are properly aligned before tightening. Replace bolts if they are damaged or stretched.
2

CV Joint/Axle Nut

M24 x 1.5
Torque Specification
184 ft-lbs (250 N·m)
Important Notes
This nut is typically a single use fastener and should always be replaced when removed. Ensure it is properly seated and aligned.

Transmission Cooling

1

Transmission Cooler Line Banjo Bolts

M12 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Use new sealing washers and ensure the banjo fitting is properly aligned to prevent leaks.
2

Transmission Cooler Line Threaded Fittings

16mm x 1.5
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure that the fittings are clean, and do not over-tighten to avoid damaging the threads.

Transmission Electronics

1

Transmission Control Module (TCM) Mounting Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Do not over-tighten to avoid damage to the electronic module. Ensure proper alignment.
2

Range Sensor/TR Switch Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Do not over-tighten to avoid damaging the sensor or causing inaccurate readings. Ensure sensor is seated properly.
3

Transmission Fluid Pressure Sensor Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Ensure proper sensor alignment and sealing. Do not over-tighten.
4

Transmission Input/Output Speed Sensor Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Ensure proper sensor alignment. Do not over-tighten.

Transmission Valve Body

1

Valve Body Mounting Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Tighten bolts in a crisscross pattern starting from the center and working outwards. Do not over-tighten to avoid damage to the valve body.

Body

Torque specifications for Body

Wheel System

1

Wheel Lug Nuts

M14 x 1.5
Torque Specification
100 ft-lbs (136 N·m)
Important Notes
Torque lug nuts in a star pattern to ensure even clamping pressure.

Fuel System

1

Fuel Tank Strap Bolts

M8 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Ensure even tightening of the straps to maintain the fuel tank’s secure position.
2

Fuel Filler Neck Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Do not overtighten these bolts to avoid damaging the filler neck or the body.

Body Structure

1

Body Mount Bolts

M12 x 1.75
Torque Specification
65 ft-lbs (88 N·m)
Important Notes
Torque body mount bolts to the specified torque in a criss-cross sequence to ensure even pressure on all mounts. Estimated value; verify with service manual.
2

Hood Hinge Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure that the hood is aligned correctly before final torque is applied. Estimated value; verify with service manual.
3

Fender Bolts

M6 x 1.0
Torque Specification
8.3 ft-lbs (11 N·m)
Important Notes
Do not overtighten, as the fender material may deform or crack. Estimated value; verify with service manual.
4

Door Hinge Bolts

M10 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Ensure proper door alignment before tightening these bolts. Estimated value; verify with service manual.
5

Door Latch/Striker Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Adjust the striker position for correct door closing before final torque. Estimated value; verify with service manual.
6

Seat Mounting Bolts

M10 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Tighten securely to ensure occupant safety. Estimated value; verify with service manual.
7

Bumper Mounting Bolts

M8 x 1.25
Torque Specification
24 ft-lbs (33 N·m)
Important Notes
Ensure that all plastic fasteners are correctly aligned and fitted. Estimated value; verify with service manual.
8

Tailgate/Liftgate Hinge Bolts

M8 x 1.25
Torque Specification
23 ft-lbs (31 N·m)
Important Notes
Ensure the tailgate/liftgate is properly aligned before tightening. Estimated value; verify with service manual.
9

Tailgate/Liftgate Latch/Striker Bolts

M6 x 1.0
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Adjust latch/striker position to ensure the tailgate/liftgate closes securely. Estimated value; verify with service manual.

Exterior Components

1

Grill Mounting Bolts

M6 x 1.0
Torque Specification
8.3 ft-lbs (11 N·m)
Important Notes
Tighten evenly to avoid cracking the plastic grille. Estimated value; verify with service manual.
2

Headlight Mounting Bolts

M6 x 1.0
Torque Specification
8.3 ft-lbs (11 N·m)
Important Notes
Do not overtighten to avoid damage to the headlight assembly or mounting tabs. Estimated value; verify with service manual.
3

Taillight Mounting Bolts

M6 x 1.0
Torque Specification
8.3 ft-lbs (11 N·m)
Important Notes
Tighten carefully to ensure proper fit and electrical connection. Estimated value; verify with service manual.
4

Mirror Mounting Bolts

M6 x 1.0
Torque Specification
8.3 ft-lbs (11 N·m)
Important Notes
Ensure the mirror is correctly positioned and aligned before tightening. Estimated value; verify with service manual.
5

Roof Rack Mounting Bolts

M8 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Tighten evenly to distribute the load across all mounting points. Estimated value; verify with service manual.

Brakes

Torque specifications for Brakes

Brake Calipers

1

Caliper Guide Pin Bolts

M10 x 1.5
Torque Specification
75 ft-lbs (102 N·m)
Important Notes
These bolts secure the caliper to the mounting bracket. Ensure proper torque for even pad wear and brake function.
2

Caliper Mounting Bracket Bolts

M14 x 2.0
Torque Specification
129 ft-lbs (175 N·m)
Important Notes
These bolts secure the caliper mounting bracket to the steering knuckle or hub assembly. Proper torque is critical.
3

Brake Line Fitting at Caliper (Steel)

M10 x 1.0 (estimated)
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure a leak-free seal. This is an estimated value. Confirm material before torquing.
4

Brake Line Fitting at Caliper (Aluminum)

M10 x 1.0 (estimated)
Torque Specification
12 ft-lbs (16 N·m)
Important Notes
Ensure a leak-free seal. This is an estimated value. Confirm material before torquing.

Brake Rotors

1

Brake Disc/Drum Retaining Bolts

M8 x 1.25
Torque Specification
89 ft-lbs (120 N·m)
Important Notes
These bolts secure the rotor to the hub. Ensure proper alignment and prevent vibrations. Ensure the hub mating surfaces are clean and free from debris.

Master Cylinder And Booster

1

Brake Master Cylinder Mounting Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
These bolts attach the master cylinder to the brake booster. Ensure no leaks and correct brake feel. Ensure the mating surface of the booster and master cylinder are clean and free from debris.
2

Brake Booster Mounting Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
These bolts attach the brake booster to the firewall or chassis. Correct torque prevents movement and noise. Ensure the mounting location and booster mating surface are free from debris.
3

Brake Line Fitting at Master Cylinder (Steel)

M10 x 1.0 (estimated)
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure a leak-free seal. This is an estimated value. Confirm material before torquing. Always use a flare nut wrench when tightening brake line fittings.
4

Brake Line Fitting at Master Cylinder (Aluminum)

M10 x 1.0 (estimated)
Torque Specification
12 ft-lbs (16 N·m)
Important Notes
Ensure a leak-free seal. This is an estimated value. Confirm material before torquing. Always use a flare nut wrench when tightening brake line fittings.

Brake Lines And Junctions

1

Brake Line Junction Block/ABS Module Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (13 N·m)
Important Notes
These small bolts secure the brake line junction or ABS module. Over-tightening can damage components.

Parking Brake

1

Parking Brake Cable Bracket Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (13 N·m)
Important Notes
These small bolts secure the parking brake cable brackets to the chassis or suspension. Check for proper cable operation after torquing.

Wheel Attachment

1

Wheel Lug Nuts

M14 x 1.5
Torque Specification
100 ft-lbs (136 N·m)
Important Notes
Tighten lug nuts in a star pattern. Proper torque is crucial for wheel security. Always double check torque after driving 50-100 miles.

Drivetrain

Torque specifications for Drivetrain

Engine Interface

1

Flywheel/Flexplate Bolts

M11 x 1.25
Torque Specification
1. 60 ft-lbs (81 N·m)
Important Notes
Apply threadlocker. Ensure proper tightening sequence is followed (typically a star pattern).
2

Starter Motor Mounting Bolts

M10 x 1.5
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Ensure starter is properly aligned before tightening.

Transmission

1

Transmission Mounting Bolts

M12 x 1.75
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Ensure transmission is properly aligned before tightening. Verify specific bolt locations on the housing.
2

Transmission Oil Pan Bolts

M6 x 1
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Tighten in a cross pattern to prevent leaks. Use a new gasket if replacing the pan.
3

Transmission Drain and Fill Plugs

M18 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Use new crush washers when installing. Do not overtighten. Ensure proper fluid level after refilling.

Axle Driveshaft

1

Drive Axle/Half Shaft Bolts (Transmission Side)

M10 x 1.25
Torque Specification
118 ft-lbs (160 N·m)
Important Notes
Apply threadlocker. Ensure axle is fully seated in the flange.
2

CV Joint/Axle Nut

M24 x 1.5
Torque Specification
184 ft-lbs (250 N·m)
Important Notes
Use a new nut each time. Ensure proper seating of the axle in the hub and the bearing.
3

Propeller/Drive Shaft Bolts

M10 x 1.5
Torque Specification
118 ft-lbs (160 N·m)
Important Notes
Apply threadlocker. Ensure proper alignment and install bolts in a cross pattern.
4

Driveshaft Center Support Bearing Bolts

M8 x 1.25
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Estimated value. Verify exact spec in the service manual. Ensure proper bearing alignment prior to tightening. This may not be present on all models.

Differential Transfercase

1

Differential Mounting Bolts

M12 x 1.75
Torque Specification
60 ft-lbs (81 N·m)
Important Notes
Estimated value. Verify exact spec in the service manual. Ensure proper alignment before tightening.
2

Differential Drain/Fill Plugs

M18 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Use new crush washers when installing. Do not overtighten. Ensure proper fluid level after refilling.
3

Transfer Case Mounting Bolts

M12 x 1.75
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
Estimated value. Verify exact spec in the service manual. Ensure proper alignment before tightening. This may not be present on all models.
4

Transfer Case Drain/Fill Plugs

M18 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Use new crush washers when installing. Do not overtighten. Ensure proper fluid level after refilling.

Electrical

Torque specifications for Electrical

Ignition System

1

Ignition Coil Mounting Bolt

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Ensure proper alignment of the coil before tightening. Over-torquing can damage the coil mounting points.

Starting System

1

Starter Motor Mounting Bolts

M10 x 1.5
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Ensure the starter motor is properly aligned before tightening. Over-torquing can cause damage.

Charging System

1

Alternator Mounting Bolts

M10 x 1.5
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Proper alignment is critical for correct belt tension and electrical grounding. Over-torquing may damage the alternator or mounting bracket.

Battery System

1

Battery Terminal Nuts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Ensure the terminals and cable connectors are clean and free of corrosion before installation. Do not over-tighten as terminals can be easily damaged.

Engine Control

1

ECM Mounting Bolts

M6 x 1.0
Torque Specification
6.2 ft-lbs (8.5 N·m)
Important Notes
Ensure the ECM is properly seated and aligned before tightening. Torque value is estimated and should be verified with the vehicle's service documentation.

Body Control

1

BCM Mounting Bolts

M6 x 1.0
Torque Specification
6.2 ft-lbs (8.5 N·m)
Important Notes
Ensure the BCM is correctly seated before tightening. Torque value is estimated and should be verified with the vehicle's service documentation.

Grounding System

1

Ground Strap Mounting Bolt

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Ensure grounding surfaces are clean and free of corrosion. Ensure the strap is properly seated. Torque value is estimated and should be verified with the vehicle's service documentation.

Power Distribution

1

Fuse Block/Distribution Block Mounting Bolt

M6 x 1.0
Torque Specification
6.2 ft-lbs (8.5 N·m)
Important Notes
Ensure the block is properly positioned before tightening. Torque value is estimated and should be verified with the vehicle's service documentation.

Sensors

1

Sensor Mounting Bolt/Screw

M5 x 0.8
Torque Specification
4.8 ft-lbs (6.5 N·m)
Important Notes
Ensure the sensor is correctly aligned before tightening. Torque value is estimated and should be verified with the vehicle's service documentation. Overtightening can damage the sensor or mounting point.

Emissions Sensors

Torque specifications for Emissions_sensors

Exhaust System

1

EGR Valve

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure proper gasket alignment during installation. Torque bolts evenly in a criss-cross pattern.
2

Exhaust Manifold/Headers to Cylinder Head

M10 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Use new gaskets. Tighten bolts in the specified sequence, starting from the center and moving outwards.
3

Exhaust Pipe to Exhaust Manifold/Headers

M10 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure proper alignment of exhaust components before tightening. Use new gaskets or sealant as needed.
4

Catalytic Converter to Exhaust Pipe

M10 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Use new gaskets or seals. Ensure correct orientation of catalytic converter.
5

Muffler to Exhaust Pipe

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure proper alignment of muffler and exhaust pipe. Use new clamps or hangers if necessary.
6

NOx Sensor

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Use anti-seize on threads if required. Be careful not to damage the sensor during installation.
7

Particulate Matter Sensor

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Handle sensor with care. Ensure proper alignment to avoid damage.
8

Exhaust Gas Temperature (EGT) Sensor

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Do not over-tighten. Be careful not to damage the sensor.
9

Diesel Particulate Filter (DPF) Mounting/Retaining Bolts

M10 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Use new gaskets and correct alignment for proper function.
10

Differential Pressure Sensor (DPF)

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure proper fitting and sealing. Do not overtighten.

Engine Sensors

1

Oxygen Sensor (O2 Sensor)

M18 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Use anti-seize compound on threads if specified by the manufacturer. Do not over tighten.
2

Mass Air Flow (MAF) Sensor

M6 x 1.0
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
Do not over tighten, as the sensor housing is typically plastic and can be damaged. Use a torque wrench to achieve the correct torque.
3

Camshaft Position Sensor

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Ensure proper sensor seating. Do not over tighten to avoid sensor damage.
4

Crankshaft Position Sensor

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Ensure sensor is correctly seated before tightening. Check for damage on the sensor.
5

Turbocharger Boost Pressure Sensor

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Handle sensor with care. Do not over tighten.

Secondary Air And Evap

1

Secondary Air Injection Pump

M6 x 1.0
Torque Specification
8.8 ft-lbs (12 N·m)
Important Notes
Mount the pump securely. Be mindful of any rubber isolators or mounting hardware.
2

Evaporative Emission (EVAP) Canister

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Ensure the canister is correctly seated. Avoid over tightening to prevent damage.
3

EVAP Purge Valve

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Ensure the purge valve is correctly seated. Avoid over tightening.
4

Fuel Tank Pressure Sensor

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Ensure proper seating and seal to avoid vacuum leaks. Do not over tighten.

Scr System

1

SCR Injector

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Use new seals if available. Ensure injector is correctly seated and aligned.
2

Reductant Pump

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Use new seals or gaskets. Ensure pump is aligned to prevent leaks or damage.

Turbocharging System

1

Turbocharger Mounting Bolts

M10 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Use new gaskets and tighten in a cross pattern to avoid leaks or distortions.
2

Turbocharger Wastegate Actuator Bolts

M6 x 1.0
Torque Specification
8.8 ft-lbs (12 N·m)
Important Notes
Ensure the actuator is properly aligned and secured to the turbocharger.

Exhaust

Torque specifications for Exhaust

Exhaust Manifold

1

Exhaust Manifold/Header to Cylinder Head Bolts

M10 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Use a cross-tightening pattern. Start with hand-tightening, then progressively tighten to the final torque.
2

Exhaust Pipe to Exhaust Manifold/Header Flange Bolts

M10 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure proper alignment of flanges. Use new gasket.
3

Exhaust Manifold/Header Flange Spring Bolts (if applicable)

M10 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Spring bolts require proper torque to ensure correct spring compression and a leak-free seal.

Exhaust Midpipe

1

Catalytic Converter to Exhaust Pipe Bolts

M10 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Always use new gaskets. Ensure proper alignment before tightening.

Exhaust Tailpipe

1

Muffler to Exhaust Pipe Bolts

M10 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure proper alignment to prevent strain on the muffler. Use new gaskets.

Exhaust Support

1

Exhaust Hanger Bolts/Nuts

M10 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Ensure proper alignment of hangers. Loose or over-tightened bolts can cause rattles or damage. Value is estimated, check service manual for specific value.

Emissions Control

1

EGR Valve Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Proper torque is essential for a leak-free seal. Confirm alignment of gasket and ports.
2

Oxygen (O2) Sensor

M18 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Apply a light coat of anti-seize to threads. Do not over-tighten. Value is estimated, check specific O2 sensor instructions for a specific value.

Fuel

Torque specifications for Fuel

Fuel Rail

1

Fuel Rail Mounting Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Torque bolts evenly. Ensure proper alignment before final torque.
2

Fuel Rail to Fuel Line Connection Fitting

M12 x 1.5
Torque Specification
15 ft-lbs (20.3 N·m)
Important Notes
Use new crush washers. This is an estimated value based on common fitting sizes.

Fuel Injectors

1

Fuel Injector Mounting Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Torque evenly to avoid damaging the injector.
2

Fuel Injector Inlet Banjo Bolt

M10 x 1.25
Torque Specification
15 ft-lbs (20.3 N·m)
Important Notes
Always use new crush washers on banjo bolts. This is an estimated value.

Fuel Pump

1

Fuel Pump Mounting Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure proper alignment before tightening.
2

Fuel Pump Outlet Fitting

M12 x 1.5
Torque Specification
15 ft-lbs (20.3 N·m)
Important Notes
Use new crush washers. This is an estimated value.

Fuel Filter

1

Fuel Filter Banjo Bolt

M10 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Use new crush washers on the fuel filter connections.
2

Fuel Filter Mounting Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Torque evenly to prevent filter damage or movement.

Fuel Tank

1

Fuel Filler Neck Mounting Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Torque evenly to ensure a good seal.
2

Fuel Tank Sending Unit/Access Plate Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Tighten to prevent fuel vapor leaks. Use new gasket if required.

Hvac

Torque specifications for Hvac

Ac Compressor

1

A/C Compressor Mounting Bolts

M10 x 1.5
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Secures the A/C compressor to its mounting bracket on the engine. Critical for proper alignment, preventing vibration, and ensuring efficient operation. Use a calibrated torque wrench for accurate tightening.
2

A/C Line Fittings

Varies by location, M16 x 1.5 estimated
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Connects refrigerant lines to compressor, condenser, evaporator, and other components. Proper torque ensures a leak-free seal. Over or under tightening can cause leaks. This is an estimated value, verify with service manual when possible.

Ac Condenser

1

A/C Condenser Mounting Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Mounts the A/C condenser to the radiator core support or front of the vehicle. Ensure bolts are properly threaded to prevent damage to the condenser. This is an estimated value, verify with service manual when possible.

Ac Evaporator

1

A/C Evaporator Case Bolts/Screws

M5 x 0.8
Torque Specification
5.9 ft-lbs (8 N·m)
Important Notes
Secures the evaporator case together. Over-tightening can damage the plastic case. This is an estimated value, verify with service manual when possible.

Hvac Blower

1

HVAC Blower Motor Mounting Screws

M4 x 0.7
Torque Specification
5.1 ft-lbs (7 N·m)
Important Notes
Attaches the blower motor to the HVAC housing. Correct torque avoids vibration. This is an estimated value, verify with service manual when possible.

Hvac Controls

1

HVAC Control Module Mounting Screws

M4 x 0.7
Torque Specification
5.9 ft-lbs (8 N·m)
Important Notes
Secures the HVAC control module. Proper torque prevents damage to the electronics. This is an estimated value, verify with service manual when possible.
2

HVAC Mode Door Actuator Screws

M4 x 0.7
Torque Specification
3.7 ft-lbs (5 N·m)
Important Notes
Mounting screws for mode door actuators. Proper torque ensures actuator function and avoids binding. Over tightening could damage plastic housing of actuator. This is an estimated value, verify with service manual when possible.

Suspension

Torque specifications for Suspension

Strut Shock Assembly

1

Strut/Shock Absorber Upper Mounting Bolts

M12 x 1.75
Torque Specification
85 ft-lbs (115 N·m)
Important Notes
These bolts secure the top of the strut assembly to the strut tower. Ensure proper seating before tightening. Estimated bolt size and torque value.
2

Lower Shock Absorber/Strut to Knuckle Bolt

M14 x 1.5
Torque Specification
118 ft-lbs (160 N·m)
Important Notes
This bolt secures the bottom of the strut/shock to the steering knuckle. Ensure correct bolt orientation. Estimated bolt size and torque value.

Control Arm Assembly

1

Control Arm Mounting Bolts

M14 x 1.5
Torque Specification
85 ft-lbs (115 N·m)
Important Notes
These bolts secure the control arm to the frame and/or subframe. Estimated bolt size and torque value.
2

Ball Joint Nut

M12 x 1.25
Torque Specification
94 ft-lbs (128 N·m)
Important Notes
This nut secures the ball joint stud to the steering knuckle or control arm. Estimated bolt size.

Steering System

1

Tie Rod End Nut

M10 x 1.25
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
This nut secures the tie rod end to the steering knuckle. Estimated bolt size.
2

Steering Gear/Rack Mounting Bolts

M12 x 1.75
Torque Specification
111 ft-lbs (150 N·m)
Important Notes
These bolts secure the steering rack to the vehicle frame. Estimated bolt size.

Sway Bar System

1

Sway Bar Link Nut

M10 x 1.5
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
These nuts secure the sway bar links to the control arm or strut assembly. Estimated bolt size.
2

Sway Bar Bracket Bolts

M10 x 1.5
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
These bolts secure the sway bar brackets to the vehicle frame. Estimated bolt size.
3

Stabilizer Bar Bushing Retaining Clamp Bolts

M8 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
These bolts secure the stabilizer bar bushing retainers. Estimated bolt size.

Rear Suspension

1

Trailing Arm Bolt

M14 x 1.5
Torque Specification
100 ft-lbs (136 N·m)
Important Notes
This bolt secures the trailing arm to the vehicle's chassis. Estimated bolt size.

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

What IS the torque specification for the lug nuts on a 2021-Present Buick Envision?

The lug nuts on a 2021-Present Buick Envision should be torqued to 140 ft-lbs, per Buick specifications.

Q2

What type of torque wrench should be used for tightening critical suspension components?

A properly calibrated click-type torque wrench should be used for tightening critical suspension components to ensure accurate and precise torque application.

Q3

How often should torque values be checked?

Torque values should be checked at every major service interval or as recommended by Buick in the vehicle's maintenance schedule to ensure proper functionality and safety.

Q4

IS it acceptable to re-use bolts after they have been torqued and removed?

In most cases, bolts should not be reused after they have been torqued and removed, as they may have been stretched or weakened during the initial tightening process.

Q5

What are the consequences of over-tightening bolts?

Over-tightening bolts can lead to stripped threads, damaged components, bolt failure, and potential safety hazards.

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

Digital Torque Wrench (10-100 Nm)

Essential for tightening fasteners to precise torque specifications, preventing damage and ensuring proper assembly. This range IS suitable for many applications on the envision.

  • Digital display for accurate readings
  • Audible alarm when target torque IS reached
  • Multiple units (Nm, ft-lb, in-lb)
  • Reversible ratcheting mechanism
Learn more
Service Procedures

Bolt Torque Specifications for 2021-Present Buick Envision

Technical procedure for tightening fasteners on the Buick Envision.

  • Refer to the vehicle service manual for specific torque values for each component.
  • Clean all threads and fasteners before assembly.
  • Tighten bolts gradually, alternating between fasteners to ensure even distribution of force.
  • Use a torque wrench to achieve the specified torque value.
  • Double-check all torque values after assembly.
View full procedure
Technical Service Bulletins

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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.
  • Vehicle specifications and procedures may vary by model year, trim level, and region.
  • Always follow the manufacturer's recommended procedures and safety precautions.
  • Working on vehicles can be dangerous. Always take proper safety precautions and use appropriate safety equipment.
  • If you're unsure about any procedure, consult a qualified professional mechanic.
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About the Author

Expert automotive knowledge and experience

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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