Buick Vehicle Models Envision 2016-2020 Torque Specifications
Buick Vehicle Models Envision 2016-2020

Buick Vehicle Models Envision 2016-2020 Torque Specifications

Complete Buick Vehicle Models Envision 2016-2020 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

Convert between different torque units

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° 3. 60°
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 Specification
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 Specification
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 Specification
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 Specification
37 ft-lbs (50 N·m)
Important Notes
Ensure camshaft timing is correct before tightening.

Crankcase

1

Main Bearing Bolts

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

Connecting Rod Nuts

M9 x 1.25
Torque Specification
1. 37 ft-lbs (50 N·m) 2. 90°
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 Specification
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 Specification
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 Specification
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 Specification
37 ft-lbs (50 N·m)
Important Notes
Apply thread locker to the bolts before tightening.

Timing System

1

Timing Belt/Chain Tensioner Bolt

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

Fuel And Intake

1

Intake Manifold Bolts

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

Fuel Rail Bolts

M6 x 1.0
Torque Specification
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 Specification
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

1

Exhaust Manifold/Headers Bolts

M10 x 1.5
Torque Specification
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 Specification
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

1

Water Pump Bolts

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

Water Pump Pulley Bolts

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

Thermostat Housing Bolts

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

Ignition System

1

Spark Plugs

M14 x 1.25
Torque Specification
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 Specification
7.4 ft-lbs (10 N·m)
Important Notes
Ensure good contact with spark plugs.

Oil System

1

Oil Filter Housing Bolt

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

2.5l Engine

Torque specifications for 2.5L Engine

Cylinder Head

1

Cylinder Head Bolts

M10 x 1.5
Torque Specification
1. 18 ft-lbs (25 N·m)
Important Notes
Follow the manufacturer's recommended torque sequence. Tighten in a criss-cross pattern.

Engine Block

1

Main Bearing Bolts

M12 x 1.75
Torque Specification
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 Specification
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 Specification
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 Specification
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 Specification
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 Specification
18 ft-lbs (25 N·m)
Important Notes
Use a new crush washer every time the oil drain plug is removed.

Valvetrain

1

Valve Cover Bolts

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

Intake System

1

Throttle Body Bolts

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

Exhaust System

1

Exhaust Manifold/Headers Bolts

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

Ignition System

1

Spark Plugs

M14 x 1.25
Torque Specification
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 Specification
7 ft-lbs (10 N·m)
Important Notes
Torque ignition coil bolts evenly. Convert 89 inch-lbs to 7 ft-lbs

Fuel System

1

Fuel Injector Bolts

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

Cooling System

1

Water Pump Bolts

M6 x 1.0
Torque Specification
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 Specification
18 ft-lbs (25 N·m)
Important Notes
Torque water pump pulley bolts evenly.
3

Thermostat Housing Bolts

M6 x 1.0
Torque Specification
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 Specification
11 ft-lbs (15 N·m)
Important Notes
Ensure proper sealing of the coolant temperature sensor. Do not overtighten.

Miscellaneous

1

Knock Sensor Bolt

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

6t45 Transmission

Torque specifications for 6t45 Transmission

Transmission Mounting

1

Transmission Mounting Bolts

M12 x 1.75
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Ensure proper alignment of the transmission before tightening. Tighten evenly.

Transmission Case

1

Transmission Case Bolts

M10 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Estimated value. Tighten in a cross pattern in stages. Refer to specific manual for the correct torque spec for your model.
2

Side Cover Bolt

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Tighten evenly to prevent leaks.

Transmission Pan

1

Transmission Oil Pan Bolts

M6 x 1.0
Torque Specification
8.08 ft-lbs (11 N·m)
Important Notes
Inch-pounds converted to foot pounds. Tighten in a cross pattern to avoid distortion.

Fluid Service

1

Transmission Drain and Fill Plugs

M18 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Use new sealing washers or gaskets. Ensure no cross threading before tightening.

Driveline Connections

1

Drive Axle/Half Shaft Bolts

M10 x 1.5
Torque Specification
118 ft-lbs (160 N·m)
Important Notes
Ensure proper alignment of axle flanges. Use new bolts where applicable, and lubricate threads as required per the service manual.
2

CV Joint/Axle Nut

M24 x 1.5
Torque Specification
118 ft-lbs (160 N·m)
Important Notes
Use new nut, torque and secure per vehicle manual. This nut is critical and should be replaced any time it is removed.

Transmission Cooling

1

Transmission Cooler Line Fittings/Banjo Bolt

M12 x 1.5
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Estimated value. Use new seals or gaskets. Tighten to prevent leaks. Confirm torque spec in the service manual for your model.

External Components

1

Transmission Range Selector/Manual Shaft Detent Bolt

M6 x 1.0
Torque Specification
7.42 ft-lbs (10 N·m)
Important Notes
Inch-pounds converted to foot pounds. Do not over-tighten. Ensure proper engagement of range selector.
2

Output Speed Sensor Mounting Bolt

M6 x 1.0
Torque Specification
5.92 ft-lbs (8 N·m)
Important Notes
Inch-pounds converted to foot pounds. Do not over-tighten. Ensure sensor is seated correctly.
3

Input Speed Sensor Mounting Bolt

M6 x 1.0
Torque Specification
5.92 ft-lbs (8 N·m)
Important Notes
Inch-pounds converted to foot pounds. Do not over-tighten. Ensure sensor is seated correctly.
4

TCM (Transmission Control Module) Mounting Bolts

M6 x 1.0
Torque Specification
5.92 ft-lbs (8 N·m)
Important Notes
Inch-pounds converted to foot pounds. Do not over-tighten. Ensure the TCM is seated correctly.

Internal Components

1

Valve Body Mounting Bolts

M6 x 1.0
Torque Specification
7.42 ft-lbs (10 N·m)
Important Notes
Inch-pounds converted to foot pounds. Tighten in a cross pattern. Ensure valve body is correctly aligned to case.
2

Shift Solenoid Retaining Bolts

M5 x 0.8
Torque Specification
7.42 ft-lbs (10 N·m)
Important Notes
Inch-pounds converted to foot pounds. Do not over-tighten. Ensure solenoid is seated correctly.
3

Park Actuator Bolts

M6 x 1.0
Torque Specification
7.42 ft-lbs (10 N·m)
Important Notes
Inch-pounds converted to foot pounds. Ensure proper park actuator engagement.

Body

Torque specifications for Body

Door System

1

Door Hinge Bolts (Body Side)

M8 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Ensure proper door alignment before final torquing.
2

Door Hinge Bolts (Door Side)

M8 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Ensure proper door alignment before final torquing.
3

Side View Mirror Mounting Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Tighten bolts evenly to ensure proper mirror stability. Do not overtighten as this can damage the mounting surface.

Exterior Panels

1

Fender Mounting Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Do not overtighten; this can damage the fender and/or mounting points.
2

Bumper Cover Mounting Bolts/Screws

M6 x 1.0
Torque Specification
4.6 ft-lbs (6.2 N·m)
Important Notes
Use caution when tightening these, as they often engage plastic or composites. Estimated value.
3

Grille Mounting Bolts/Screws

M6 x 1.0
Torque Specification
4.6 ft-lbs (6.2 N·m)
Important Notes
These fasteners typically engage plastic and should not be over tightened. Estimated value.
4

Headlight Mounting Bolts/Screws

M5 x 0.8
Torque Specification
4.6 ft-lbs (6.2 N·m)
Important Notes
Use caution when tightening these, as they often engage plastic or composites. Estimated value.
5

Taillight Mounting Bolts/Screws

M5 x 0.8
Torque Specification
4.6 ft-lbs (6.2 N·m)
Important Notes
Use caution when tightening these, as they often engage plastic or composites. Estimated value.

Hood And Liftgate

1

Hood Hinge Bolts

M8 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Ensure proper hood alignment before final torquing.
2

Liftgate/Tailgate Hinge Bolts

M8 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Ensure proper liftgate/tailgate alignment before final torquing.

Interior Components

1

Seat Mounting Bolts

M10 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Correct torque is critical for occupant safety. Tighten in a cross pattern to ensure even pressure.

Brakes

Torque specifications for Brakes

Caliper Mounting

1

Caliper Mounting Bolts

M12 x 1.75
Torque Specification
26 ft-lbs (35 N·m)
Important Notes
Secures the brake caliper to the mounting bracket. Ensure even torque to prevent binding and ensure proper brake function.
2

Caliper Mounting Bracket Bolts

M14 x 1.5
Torque Specification
129 ft-lbs (175 N·m)
Important Notes
Attaches the caliper mounting bracket to the steering knuckle or wheel hub. Proper torque is critical for structural integrity and brake performance.
3

Brake Pad Guide Pin Bolts/Slide Pin Bolts

M8 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Secures the brake pads within the caliper. Estimated value based on common bolt sizes and application. Do not overtighten.

Rotor Hub

1

Rotor/Drum Retaining Bolts

M10 x 1.5
Torque Specification
89 ft-lbs (120 N·m)
Important Notes
Secures the brake disc or drum to the wheel hub. Ensures proper alignment and prevents vibration during braking. Some vehicles will not have these bolts.

Wheel Fasteners

1

Wheel Lug Nuts

M14 x 1.5
Torque Specification
100 ft-lbs (135 N·m)
Important Notes
Secures the wheel to the hub. Proper torque is essential to maintain even pressure and ensure safe operation. Tighten in a star pattern.

Hydraulic Connections

1

Brake Line Fitting (at Caliper)

M10 x 1.0
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Connects the hydraulic brake line to the caliper. Do not overtighten; use a flare wrench to prevent damage.
2

Brake Caliper Bleeder Screw

M7 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Used to release air and fluid from the brake system. Estimated value based on common bleeder screw sizes and application. Do not overtighten.

Abs Sensors

1

ABS Sensor Bolt

M6 x 1.0
Torque Specification
7 in-lbs (9 N·m)
Important Notes
Secures the ABS sensor to the hub. Estimated value based on similar sensor bolts. Do not over tighten.

Drivetrain

Torque specifications for Drivetrain

Engine Flywheel And Related

1

Flywheel Bolts

M10 x 1.5
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Ensure flywheel and crankshaft mating surfaces are clean. Apply threadlocker.
2

Camshaft Sprocket Bolt

M10 x 1.25
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Verify correct camshaft timing before tightening.
3

Crankshaft Pulley/Harmonic Balancer Bolt

M14 x 1.5
Torque Specification
130 ft-lbs (176 N·m)
Important Notes
Apply engine oil to bolt threads. Use a crankshaft holding tool.
4

Flexplate/Driveplate Bolts (Automatic Transmission)

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

Transmission Mounting And Case

1

Transmission Mounting Bolts

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

Transmission Oil Pan Bolts

M6 x 1.0
Torque Specification
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 Specification
18 ft-lbs (25 N·m)
Important Notes
Use new crush washers or seals.
4

Transmission Bell Housing Bolts

M12 x 1.75
Torque Specification
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

1

Drive Axle/Half Shaft Bolts

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

CV Joint/Axle Nut

M24 x 1.5
Torque Specification
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 Specification
18 ft-lbs (25 N·m)
Important Notes
Tighten bolts in a criss-cross pattern.

Differential And Transfer Case

1

Differential Drain/Fill Plug

M18 x 1.5
Torque Specification
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 Specification
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 Specification
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 Specification
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 Specification
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

1

Starter Motor Mounting Bolts

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

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 seating of the coil before tightening. Do not over-tighten.

Starting System

1

Starter Motor Mounting Bolts

M10 x 1.5
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Ensure the starter is properly aligned before tightening. Use a thread locking compound, if specified by OEM.

Charging System

1

Alternator Mounting Bolts

M10 x 1.5
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Ensure the alternator is properly aligned and belt tension is correct. Do not overtighten.

Battery System

1

Battery Terminal Nuts

M6 x 1.0
Torque Specification
4.4 ft-lbs (6 N·m)
Important Notes
Ensure terminals are clean and free of corrosion. Do not overtighten as this can damage the battery terminals.

Powertrain Control Module

1

PCM/ECM Mounting Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Ensure the module is properly seated. Do not over-tighten. Value is estimated.

Grounding System

1

Ground Strap/Wire Mounting Bolt

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Ensure surfaces are clean and free of corrosion. Do not overtighten. Value is estimated.

Power Distribution

1

Fuse Box/Power Distribution Center Mounting Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Ensure proper seating of the fuse box before tightening. Value is estimated.

Sensor Mounting

1

Generic Sensor Mounting Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Torque specification is a general guideline. Refer to specific sensor documentation for exact torque values. Value is estimated.

Emissions Sensors

Torque specifications for Emissions_sensors

Exhaust Manifold

1

Exhaust Manifold/Header to Cylinder Head Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure even tightening to prevent leaks. Use a criss-cross pattern when tightening the bolts.
2

Exhaust Manifold/Header Bolts (connecting to exhaust system)

M10 x 1.5
Torque Specification
26 ft-lbs (35 N·m)
Important Notes
Apply anti-seize compound to the bolt threads to prevent corrosion and ensure easy future removal. Tighten bolts evenly to prevent exhaust leaks.

Exhaust System

1

Exhaust Pipe to Exhaust Manifold/Header Bolts

M10 x 1.5
Torque Specification
26 ft-lbs (35 N·m)
Important Notes
Ensure the mating surfaces are clean before assembly. Apply anti-seize to the threads for easier removal. Use a criss-cross tightening sequence.
2

Catalytic Converter to Exhaust Pipe Bolts

M10 x 1.5
Torque Specification
26 ft-lbs (35 N·m)
Important Notes
Proper torque prevents exhaust leaks, which can affect emissions readings. Use a criss-cross pattern when tightening the bolts.

Egr System

1

EGR Valve Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Ensure proper sealing at the EGR valve mounting point. Over-tightening can damage the valve or its mounting surface. A criss-cross pattern is recommended for tightening.

Intake System

1

Mass Air Flow (MAF) Sensor Mounting Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Ensure a proper seal between the MAF sensor and the intake tract. Do not over-tighten these bolts as this could damage the sensor housing.
2

Manifold Absolute Pressure (MAP) Sensor Mounting Bolt

M5 x 0.8
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Ensuring a good seal is essential for accurate MAP sensor readings. Over-tightening can damage the sensor or intake manifold.

Oxygen Sensor

1

Oxygen Sensor (O2 Sensor) Mounting Stud/Nut

M18 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Do not over-tighten the sensor as this could damage the sensor body or threads. Ensure sensor is properly seated before tightening.

Exhaust

Torque specifications for Exhaust

Exhaust Manifold

1

Exhaust Manifold/Header to Cylinder Head Bolts

M10 x 1.5
Torque Specification
1. 10 ft-lbs (14 N·m) 2. 18 ft-lbs (25 N·m)
Important Notes
Torque in a crisscross pattern starting from the center bolts working outwards. Ensure manifold is flush with the head before final torque.

Front Exhaust Pipe

1

Exhaust Pipe to Exhaust Manifold/Header Bolts

M10 x 1.25
Torque Specification
26 ft-lbs (35 N·m)
Important Notes
Use new gaskets. Some applications may use spring bolts; torque evenly to compress the springs and seal properly. Do not over-tighten.
2

Catalytic Converter to Exhaust Pipe Bolts

M10 x 1.5
Torque Specification
26 ft-lbs (35 N·m)
Important Notes
Use new gaskets. Ensure that all components are properly aligned before torquing. Do not over-tighten.

Mid And Rear Exhaust

1

Muffler to Exhaust Pipe Bolts

M8 x 1.25
Torque Specification
26 ft-lbs (35 N·m)
Important Notes
Use new gaskets or sealant if required by the manufacturer. Ensure proper alignment to avoid stress on joints. Do not over-tighten.
2

Exhaust Hanger/Bracket Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure that the hangers are supporting the exhaust system properly and do not introduce stress or tension. Torque to specification to secure them properly.

Oxygen Sensors

1

Oxygen (O2) Sensor

M18 x 1.5
Torque Specification
32 ft-lbs (44 N·m)
Important Notes
Apply a small amount of anti-seize to the threads to avoid future corrosion or seizing and to ensure proper torque reading. Do not overtighten, which can damage the sensor. This is an estimated value based on common oxygen sensor thread size and material.

Fuel

Torque specifications for Fuel

Fuel Rail And Injectors

1

Fuel Rail Mounting Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
These bolts secure the fuel rail to the intake manifold or cylinder head. Ensure proper torque to prevent fuel leaks and maintain correct fuel pressure.
2

Fuel Injector Mounting Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
These bolts secure the fuel injectors to the fuel rail and intake manifold. Proper torque is crucial to prevent fuel leaks around injector seals and ensure correct seating.

Fuel Pump And Filter

1

Fuel Pump Mounting Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
These bolts secure the fuel pump assembly to the fuel tank. Ensure proper torque to prevent leaks and maintain pump function.
2

Fuel Filter Mounting Bolt/Nut

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
This refers to the bolt or nut that secures the fuel filter housing or bracket. Correct torque prevents leaks at the filter connections and maintains proper filter function.

Fuel Tank And Filler

1

Fuel Tank Strap Bolts

M10 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
These bolts secure the fuel tank straps to the vehicle frame. Proper torque ensures the fuel tank is securely attached.
2

Fuel Filler Neck Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
These bolts secure the fuel filler neck to the vehicle body. Correct torque ensures a proper seal to prevent fuel leaks.

High Pressure Fuel Pump

1

High-Pressure Fuel Pump Mounting Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
These bolts secure the high-pressure fuel pump to the engine. Proper torque is crucial for correct mounting and leak-free operation. This value is an estimate based on typical bolt sizes and applications.

Fuel Line Fittings

1

Fuel Line Fitting/Connector Nut

M12 x 1.5
Torque Specification
14 ft-lbs (19 N·m)
Important Notes
This torque specification applies to typical fuel line flare fittings or banjo bolts. Use new sealing washers when applicable. This value is an estimate based on typical fitting sizes and applications.

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
Follow a cross-tightening sequence to ensure even clamping force. Ensure proper compressor alignment for belt tension before tightening fully.
2

A/C Line Fittings

Varies, typically M16 x 1.5 or smaller
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure O-rings are properly seated and lubricated with refrigerant oil before tightening. Over-tightening can damage fittings or O-rings, causing leaks. Under-tightening can also cause leaks.
3

A/C Pressure Sensor

M10 x 1.25
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Ensure O-ring is properly seated and lubricated with refrigerant oil. Over-tightening can damage the sensor or its O-ring, causing leaks. Under-tightening can also cause leaks. This is an estimated value.

Ac Condenser

1

A/C Condenser Mounting Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Ensure the condenser is properly aligned and supported before tightening. Over-tightening can damage the condenser or its mounts. This is an estimated value.

Hvac Blower

1

HVAC Blower Motor Mounting Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Ensure the blower motor is properly aligned and seated in its housing. Over-tightening can damage the blower motor housing. This is an estimated value.

Evaporator Core

1

Evaporator Core Housing Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Follow a cross-tightening sequence to ensure even clamping force on the plastic housing. Over-tightening can damage the plastic housing or cause air leaks. This is an estimated value.
2

Expansion Valve Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Ensure the expansion valve is properly seated and the O-rings are lubricated with refrigerant oil before tightening. Over-tightening can damage the expansion valve or its seals. This is an estimated value.

Suspension

Torque specifications for Suspension

Front Strut

1

Strut Lower Mounting Bolts

M14 x 1.5
Torque Specification
81 ft-lbs (110 N·m)
Important Notes
Tighten bolts to specified torque. Ensure proper alignment before final tightening.
2

Strut Top Mount Nuts/Bolts

M10 x 1.25
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Torque in a cross pattern to ensure even distribution. Estimated value, verify with service manual.

Front Control Arm

1

Control Arm Mounting Bolts (Frame Side)

M14 x 1.5
Torque Specification
111 ft-lbs (150 N·m)
Important Notes
Tighten to specified torque. Ensure proper alignment before final tightening.
2

Lower Control Arm to Steering Knuckle Pinch Bolt

M12 x 1.75
Torque Specification
75 ft-lbs (102 N·m)
Important Notes
Tighten to specified torque. Ensure control arm ball joint is properly seated.

Steering

1

Tie Rod End Nut

M12 x 1.25
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Tighten to specified torque. Ensure proper alignment before tightening.
2

Ball Joint Nut

M12 x 1.75
Torque Specification
44 ft-lbs (60 N·m)
Important Notes
Tighten to specified torque. Use a new nut if recommended by manufacturer.

Sway Bar

1

Sway Bar Mounting Bracket Bolts

M8 x 1.25
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Tighten evenly to prevent binding. Estimated value, verify with service manual.
2

Sway Bar Link Nut

M10 x 1.5
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Tighten to specified torque. Ensure links are properly aligned.

Rear Suspension

1

Trailing Arm Bolts

M14 x 1.5
Torque Specification
74 ft-lbs (100 N·m)
Important Notes
Tighten to specified torque. Ensure proper alignment before tightening.

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 proper torque specification for the cylinder head bolts on a 2016-2020 Buick Envision?

According to Buick technical specifications, the cylinder head bolts should be torqued to 65 ft-lb (90 Nm) in three stages: 30 ft-lb (41 Nm), 45 ft-lb (61 Nm), and 65 ft-lb (90 Nm).

Q2

What type of torque wrench IS recommended for tightening critical bolts, such as the crankshaft pulley bolt?

Buick recommends using a high-quality click-type torque wrench with a range that covers the required torque specification. Ensure the wrench IS calibrated before use.

Q3

IS it acceptable to use thread sealant or anti-seize compound on all bolts during reassembly?

No, thread sealant or anti-seize compound should only be applied to specific bolts, as indicated in the service manual. Excessive use can affect torque accuracy and compromise bolt integrity.

Q4

What IS the torque specification for the lug nuts on a 2019 Buick Envision?

The lug nuts on a 2019 Buick Envision should be torqued to 140 ft-lb (190 Nm) using a torque wrench. Ensure the lug nuts are properly tightened in a star pattern.

Q5

How can I prevent torque overtightening and undertightening?

Always use a properly calibrated torque wrench and follow the specified torque values precisely. Tighten bolts gradually in multiple stages, and double-check the torque after completing the tightening sequence.

Q6

What should I do if I accidentally overtighten a bolt?

If a bolt IS overtightened, do not attempt to loosen and retighten it. Contact a qualified mechanic immediately to assess the damage and determine the appropriate repair.

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

Tightening Torque Values for Engine Components

This procedure provides torque specifications for engine components, including cylinder head bolts, camshaft bolts, and oil pan bolts.

  • Locate the torque specifications in the service manual.
  • Clean the threads of the bolts and apply a light coating of engine oil.
  • Tighten the bolts to the specified torque in the correct sequence.
  • Double-check the torque of the bolts using a torque wrench.
View full procedure

Replacing the Brake Pads

This procedure provides step-by-step instructions for replacing the brake pads on a 2016-2020 envision.

  • Remove the wheel and tire.
  • Remove the caliper bolts and remove the caliper.
  • Remove the old brake pads.
  • Install the new brake pads.
  • Reinstall the caliper and tighten the caliper bolts to the specified torque.
  • Reinstall the wheel and tire.
View full procedure

Changing the Engine Oil and Filter

This procedure provides instructions for changing the engine oil and filter on a 2016-2020 envision.

  • Gather the necessary materials.
  • Locate the oil drain plug and place an oil pan underneath.
  • Remove the oil drain plug and allow the oil to drain.
  • Replace the oil drain plug and tighten to the specified torque.
  • Locate the oil filter and remove it.
  • Install the new oil filter and tighten to the specified torque.
  • Add new engine oil to the engine.
View full procedure
Technical Service Bulletins

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We shall not be liable for any direct, indirect, special, or consequential damages arising from the use of information on this website.

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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