GMC Vehicle Models Envoy 2002-2009 Torque Specifications
GMC Vehicle Models Envoy 2002-2009

GMC Vehicle Models Envoy 2002-2009 Torque Specifications

Complete GMC Vehicle Models Envoy 2002-2009 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

Search Specifications

Search by component name, bolt size, or description

Torque Calculator

Convert between different torque units

4.2l Engine

Torque specifications for 4.2L Engine

Cylinder Head

1

Cylinder Head Bolts

M10 x 1.5
Torque Specification
1. 18 ft-lbs (25 N·m) 2. 90°
Important Notes
Follow the manufacturer's torque sequence for proper sealing. Estimated bolt size based on typical cylinder head bolts.
2

Rocker Arms/Shafts Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure proper valve operation by tightening evenly. Estimated bolt size based on typical rocker arm bolts.

Crankshaft And Bearings

1

Main Bearing Bolts

M12 x 1.75
Torque Specification
63 ft-lbs (85 N·m)
Important Notes
Ensure proper alignment of the crankshaft. Estimated bolt size based on typical main bearing bolts.
2

Connecting Rod Nuts

M9 x 1.0
Torque Specification
24 ft-lbs (33 N·m)
Important Notes
Ensure proper piston movement. Estimated bolt size based on typical connecting rod bolts.

Timing System

1

Camshaft Sprocket Bolt

M12 x 1.5
Torque Specification
80 ft-lbs (108 N·m)
Important Notes
Ensure proper timing alignment. Estimated bolt size based on typical camshaft sprocket bolts.
2

Timing Belt/Chain Tensioner Bolt

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure proper tension on the timing belt/chain. Estimated bolt size based on typical tensioner bolts.

Intake And Exhaust

1

Intake Manifold Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure a proper seal to prevent vacuum leaks. Estimated bolt size based on typical intake manifold bolts.
2

Exhaust Manifold Bolts

M8 x 1.25
Torque Specification
26 ft-lbs (35 N·m)
Important Notes
Ensure a proper seal to prevent exhaust leaks. Estimated bolt size based on typical exhaust manifold bolts.

Cooling System

1

Water Pump Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure proper coolant circulation. Estimated bolt size based on typical water pump bolts.
2

Thermostat Housing Bolts

M6 x 1.0
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure proper coolant flow. Estimated bolt size based on typical thermostat housing bolts.

4l60 Transmission

Torque specifications for 4l60 Transmission

Transmission Mounting

1

Transmission Mounting Bolts

M10 x 1.5
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Ensure proper alignment of the transmission before tightening.

Oil Pan

1

Transmission Oil Pan Bolts

M6 x 1.0
Torque Specification
8.1 ft-lbs (11 N·m)
Important Notes
Ensure the oil pan gasket is properly seated before tightening.

Fluid Management

1

Transmission Drain Plug

M12 x 1.75
Torque Specification
27 ft-lbs (37 N·m)
Important Notes
Ensure the drain plug sealing washer is in good condition.
2

Transmission Fill Plug

M12 x 1.75
Torque Specification
27 ft-lbs (37 N·m)
Important Notes
Ensure the fill plug sealing washer is in good condition.
3

Transmission Cooler Line Fittings

M14 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure the cooler lines are properly aligned before tightening.

Drivetrain Connection

1

Drive Axle/Half Shaft Bolts

M10 x 1.5
Torque Specification
59 ft-lbs (80 N·m)
Important Notes
Ensure the axle is properly seated before tightening.
2

CV Joint/Axle Nut

M24 x 1.5
Torque Specification
118 ft-lbs (160 N·m)
Important Notes
Ensure the CV joint is properly seated before tightening.
3

Propeller/Drive Shaft Bolts

M8 x 1.25
Torque Specification
14 ft-lbs (19 N·m)
Important Notes
Ensure the drive shaft is properly aligned before tightening.

Starter Motor

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.

Torque Converter

1

Torque Converter Bolts

M8 x 1.25
Torque Specification
46 ft-lbs (62 N·m)
Important Notes
Ensure the torque converter is properly seated before tightening.

Bell Housing

1

Bell Housing Bolts

M10 x 1.5
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Ensure the bell housing is properly aligned with the engine block.

Valve Body

1

Valve Body Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Ensure the valve body is properly seated before tightening.

Shift Linkage

1

Shift Linkage Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure the shift linkage is properly aligned before tightening.

5.3l Engine

Torque specifications for 5.3L Engine

Cylinder Head

1

Cylinder Head Bolts

M10 x 1.5
Torque Specification
1. 18 ft-lbs (25 N·m) 2. 90°
Important Notes
Follow the manufacturer's specified torque sequence to ensure even clamping force.
2

Rocker Arms/Shafts Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure rocker arms are properly seated before tightening.

Crankshaft And Bearings

1

Main Bearing Bolts

M12 x 1.75
Torque Specification
63 ft-lbs (85 N·m)
Important Notes
Follow the specified torque sequence to ensure proper crankshaft alignment.
2

Connecting Rod Nuts

M9 x 1.0
Torque Specification
24 ft-lbs (33 N·m)
Important Notes
Ensure connecting rods are properly seated before tightening.
3

Flywheel Bolts

M12 x 1.75
Torque Specification
74 ft-lbs (100 N·m)
Important Notes
Use thread locker on flywheel bolts as specified by the manufacturer.

Timing System

1

Timing Chain Tensioner Bolt

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure the tensioner is properly seated before tightening.
2

Camshaft Sprocket Bolt

M12 x 1.75
Torque Specification
80 ft-lbs (108 N·m)
Important Notes
Use thread locker on the bolt as specified by the manufacturer.

Oil System

1

Oil Pan Bolts

M6 x 1.0
Torque Specification
8.1 ft-lbs (11 N·m)
Important Notes
Ensure the oil pan gasket is properly seated before tightening.
2

Oil Filter Housing Bolt

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

Accessory Drives

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.
2

Alternator Mounting Bolts

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

Body

Torque specifications for Body

Door Hinges

1

Door Hinge Bolt

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure proper alignment of the door before tightening. Torque values are estimated based on typical door hinge applications.

Seat Mounts

1

Seat Mounting Bolt

M10 x 1.5
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Torque values are estimated based on typical seat mounting applications.

Body Panels

1

Body Panel Bolt

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Torque values are estimated based on typical body panel applications.

Roof Rack

1

Roof Rack Bolt

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Torque values are estimated based on typical roof rack applications.

Tailgate Hatch

1

Tailgate/Hatch Hinge Bolt

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure proper alignment of the tailgate or hatch before tightening. Torque values are estimated based on typical hinge applications.

Bumper Mounts

1

Bumper Mounting Bolt

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Torque values are estimated based on typical bumper mounting applications.

Mirror Mounts

1

Mirror Mounting Bolt

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Torque values are estimated based on typical mirror mounting applications.

Interior Trim

1

Interior Trim Screw/Bolt

M5 x 0.8
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Torque values are estimated based on typical interior trim applications.

Brakes

Torque specifications for Brakes

Brake Caliper

1

Brake Caliper Bolts

M10 x 1.25
Torque Specification
36 ft-lbs (49 N·m)
Important Notes
Ensure the caliper is properly aligned before torquing.
2

Brake Caliper Mounting Bracket Bolts

M12 x 1.5
Torque Specification
129 ft-lbs (175 N·m)
Important Notes
Ensure the bracket is properly seated against the steering knuckle or axle.

Brake Rotor Drum

1

Brake Disc/Drum Retaining Bolts

M8 x 1.25
Torque Specification
17 ft-lbs (23 N·m)
Important Notes
Ensure the rotor or drum is properly seated against the hub.

Brake Hydraulics

1

Brake Hose Banjo Bolt

M10 x 1.0
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Ensure the banjo fitting is properly aligned and the sealing washers are in place.
2

Brake Master Cylinder Mounting Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure the master cylinder is properly aligned with the brake booster.
3

Brake Booster Mounting Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure the booster is properly seated against the firewall.
4

Brake Pedal Assembly Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure the pedal assembly is properly aligned with the master cylinder pushrod.

Wheel Assembly

1

Wheel Lug Nuts

M12 x 1.5
Torque Specification
100 ft-lbs (136 N·m)
Important Notes
Ensure the wheel is properly seated against the hub before torquing.

Drivetrain

Torque specifications for Drivetrain

Flywheel

1

Flywheel Bolts

M10 x 1.25
Torque Specification
74 ft-lbs (100 N·m)
Important Notes
Ensure bolts are tightened in a star pattern to evenly distribute torque.

Transmission Mounting

1

Transmission Mounting Bolts

M8 x 1.25
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Ensure the transmission is properly aligned before tightening.

Transmission Fluid System

1

Transmission Oil Pan Bolts

M6 x 1.0
Torque Specification
8.1 ft-lbs (11 N·m)
Important Notes
Tighten bolts in a crisscross pattern to ensure even sealing.
2

Transmission Drain and Fill Plugs

M12 x 1.5
Torque Specification
27 ft-lbs (37 N·m)
Important Notes
Use a new crush washer to prevent leaks.

Drive Axles

1

Drive Axle/Half Shaft Bolts

M10 x 1.25
Torque Specification
59 ft-lbs (80 N·m)
Important Notes
Ensure the axle is properly seated before tightening.
2

CV Joint/Axle Nut

M24 x 1.5
Torque Specification
118 ft-lbs (160 N·m)
Important Notes
Use a new cotter pin to secure the nut.

Propeller Shaft

1

Propeller/Drive Shaft Bolts

M8 x 1.25
Torque Specification
14 ft-lbs (19 N·m)
Important Notes
Tighten bolts in a star pattern to ensure even torque distribution.

Differential

1

Differential Drain/Fill Plug

M12 x 1.5
Torque Specification
24 ft-lbs (33 N·m)
Important Notes
Use a new crush washer to prevent leaks.
2

Differential Cover Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Tighten bolts in a crisscross pattern to ensure even sealing.
3

Rear Axle Pinion Flange Nut

M24 x 1.5
Torque Specification
200 ft-lbs (271 N·m)
Important Notes
Ensure the pinion flange is properly seated before tightening.

Transfer Case

1

Transfer Case Drain/Fill Plug

M12 x 1.5
Torque Specification
24 ft-lbs (33 N·m)
Important Notes
Use a new crush washer to prevent leaks.
2

Transfer Case Mounting Bolts

M8 x 1.25
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Ensure the transfer case is properly aligned before tightening.
3

Transfer Case Output Shaft Flange Bolts

M8 x 1.25
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Tighten bolts in a star pattern to ensure even torque distribution.

Transmission Bellhousing

1

Transmission Bellhousing Bolts

M8 x 1.25
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Ensure the transmission is properly aligned with the engine before tightening.

Electrical

Torque specifications for Electrical

Ignition System

1

Ignition Coil Bolt

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Ensure the ignition coil is seated properly before tightening.

Battery System

1

Battery Terminal Nuts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Avoid over-tightening to prevent damage to the battery terminals.

Starter 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 with the flywheel before tightening.

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 with the drive belt before tightening.

Ac System

1

A/C Compressor Mounting Bolts

M10 x 1.5
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Ensure the compressor is properly aligned with the drive belt before tightening.
2

A/C Line Fittings

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure the fittings are properly seated before tightening to prevent refrigerant leaks.

Grounding System

1

Ground Strap Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure the ground strap is properly seated and free of corrosion before tightening.

Electrical Control System

1

Fuse Box Mounting Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Ensure the fuse box is properly aligned before tightening.
2

ECU/ECM Mounting Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Ensure the ECU/ECM is properly aligned before tightening.

Sensor System

1

Sensor Mounting Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Ensure the sensor is properly aligned before tightening.

Wiring System

1

Wiring Harness Clamp Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Ensure the wiring harness is properly routed before tightening.

Emissions Sensors

Torque specifications for Emissions_sensors

Egr System

1

EGR Valve Bolts

M6 x 1.0
Torque Specification
7.42 ft-lbs (10 N·m)
Important Notes
Ensure the EGR valve is properly aligned before tightening.

Exhaust Manifold

1

Exhaust Manifold/Headers Bolts

M8 x 1.25
Torque Specification
26 ft-lbs (35 N·m)
Important Notes
Use a crisscross pattern to ensure even pressure.
2

Exhaust Manifold/Headers to Cylinder Head Bolts

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

Exhaust Pipe

1

Exhaust Pipe to Exhaust Manifold/Headers Bolts

M8 x 1.25
Torque Specification
26 ft-lbs (35 N·m)
Important Notes
Ensure the gasket is properly seated before tightening.
2

Catalytic Converter to Exhaust Pipe Bolts

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

Intake System

1

Throttle Body Bolts

M6 x 1.0
Torque Specification
7.42 ft-lbs (10 N·m)
Important Notes
Ensure the throttle body is properly aligned before tightening.
2

Intake Manifold Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Use a crisscross pattern to ensure even pressure.

Emissions Control

1

Oxygen Sensor (O2 Sensor) Mounting

M12 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Ensure the sensor is properly seated before tightening.
2

Catalytic Converter Heat Shield Bolts

M6 x 1.0
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure the heat shield is properly aligned before tightening.
3

PCV Valve Mounting

M6 x 1.0
Torque Specification
7.42 ft-lbs (10 N·m)
Important Notes
Ensure the PCV valve is properly seated before tightening.
4

Evaporative Emissions Canister Mounting Bolts

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

Exhaust

Torque specifications for Exhaust

Exhaust Manifold Headers

1

Exhaust Manifold/Headers to Cylinder Head Bolts

M10 x 1.25
Torque Specification
26 ft-lbs (35 N·m)
Important Notes
Ensure bolts are tightened in a crisscross pattern to evenly distribute pressure.

Exhaust Pipe Connections

1

Exhaust Pipe to Exhaust Manifold/Headers Bolts

M10 x 1.25
Torque Specification
26 ft-lbs (35 N·m)
Important Notes
Ensure gasket is properly seated before tightening.
2

Catalytic Converter to Exhaust Pipe Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure bolts are tightened evenly to avoid warping the flange.
3

Muffler to Exhaust Pipe Bolts

M10 x 1.25
Torque Specification
26 ft-lbs (35 N·m)
Important Notes
Ensure muffler is properly aligned before tightening.

Exhaust Support Components

1

Exhaust Hanger Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure hangers are properly aligned to prevent stress on the exhaust system.
2

Oxygen Sensor Bolts

M12 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure oxygen sensor is properly seated before tightening.
3

Heat Shield Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Ensure heat shield is properly aligned to avoid rattling.

Fuel

Torque specifications for Fuel

Fuel Delivery System

1

Fuel Rail Bolts

M6 x 1.0
Torque Specification
7.42 ft-lbs (10 N·m)
Important Notes
Ensures a leak-free connection between the fuel rail and intake manifold or cylinder head.
2

Fuel Injector Bolts

M6 x 1.0
Torque Specification
7.42 ft-lbs (10 N·m)
Important Notes
Ensures a proper seal between the fuel injectors, fuel rail, and intake manifold.
3

Fuel Pressure Regulator Bolts

M6 x 1.0
Torque Specification
7.42 ft-lbs (10 N·m)
Important Notes
Estimated value based on similar M6 bolts in the fuel system. Ensures a secure connection for consistent fuel pressure.

Fuel Storage System

1

Fuel Pump Mounting Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensures the fuel pump is securely mounted to the fuel tank.
2

Fuel Tank Strap Bolts

M10 x 1.5
Torque Specification
26 ft-lbs (35 N·m)
Important Notes
Ensures the fuel tank is securely held in place by the straps.
3

Fuel Tank Sender Unit Bolts

M6 x 1.0
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Estimated value based on similar M6 bolts in the fuel system. Ensures a secure connection for accurate fuel level readings.

Fuel Filtration System

1

Fuel Filter Bolt/Nut

M8 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Ensures a leak-free connection between the fuel filter and fuel lines.

Fuel Filler System

1

Fuel Filler Neck Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensures a secure connection between the fuel filler neck and the vehicle body.

Fuel Line Connections

1

Fuel Line Fittings

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Estimated value based on similar M8 fittings in the fuel system. Ensures leak-free connections for fuel lines.

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
Ensure bolts are tightened in a crisscross pattern to evenly distribute load.

Ac Lines

1

A/C Line Fittings

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Use a backup wrench to prevent twisting of the refrigerant lines during tightening.

Evaporator

1

Evaporator Core Housing Bolts

M6 x 1.0
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure the housing gasket is properly seated before tightening.

Blower Motor

1

Blower Motor Mounting Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Estimated value based on similar M6 bolts in HVAC systems.

Heater Core

1

Heater Core Inlet/Outlet Tube Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure O-rings or gaskets are properly seated before tightening.

Condenser

1

Condenser Mounting Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure the condenser is properly aligned with the radiator before tightening.

Control Panel

1

HVAC Control Panel Mounting Screws

M5 x 0.8
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Estimated value based on similar M5 screws in HVAC systems.

Suspension

Torque specifications for Suspension

Strut Shock Absorber

1

Strut/Shock Absorber Mounting Bolts

M12 x 1.5
Torque Specification
85 ft-lbs (115 N·m)
Important Notes
Ensure proper alignment before torquing.
2

Upper Strut Mount Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Estimated value based on similar components.
3

Lower Shock Mounting Bolts

M12 x 1.5
Torque Specification
85 ft-lbs (115 N·m)
Important Notes
Ensure proper alignment before torquing.

Control Arms

1

Control Arm Bolts

M12 x 1.5
Torque Specification
85 ft-lbs (115 N·m)
Important Notes
Ensure proper alignment before torquing.
2

Ball Joint Nut

M10 x 1.25
Torque Specification
41 ft-lbs (55 N·m)
Important Notes
Ensure the ball joint is properly seated before torquing.

Steering Components

1

Tie Rod End Nut

M10 x 1.25
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Ensure the tie rod end is properly seated before torquing.
2

Steering Gear/Rack Bolts

M12 x 1.5
Torque Specification
74 ft-lbs (100 N·m)
Important Notes
Ensure proper alignment before torquing.

Sway Bar

1

Sway Bar Link Nut

M10 x 1.25
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Ensure the sway bar link is properly seated before torquing.
2

Sway Bar Bracket Bolts

M10 x 1.25
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Ensure proper alignment before torquing.

Rear Suspension

1

Rear Axle U-Bolt Nuts

M12 x 1.5
Torque Specification
85 ft-lbs (115 N·m)
Important Notes
Ensure proper alignment before torquing.
2

Trailing Arm Bolts

M12 x 1.5
Torque Specification
85 ft-lbs (115 N·m)
Important Notes
Ensure proper alignment before torquing.

Wheels

1

Wheel Lug Nuts

M12 x 1.5
Torque Specification
100 ft-lbs (136 N·m)
Important Notes
Use a crisscross pattern to ensure even torque distribution.

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 2002-2009 GMC Envoy?

130-150 ft-lbs

Q2

What IS the recommended torque for the spark plugs on a 2002-2009 GMC Envoy?

18-22 ft-lbs

Q3

What torque wrench IS recommended for tightening bolts and nuts on a GMC Envoy?

A 3/8-inch drive torque wrench with a range of 10-150 ft-lbs

Q4

How do I ensure that the bolts and nuts are torqued to the correct specifications?

Use a calibrated torque wrench and follow the manufacturer's recommended torque specifications

Q5

What are the consequences of overtightening or undertightening bolts and nuts?

Overtightening can damage the bolts, nuts, or components, while undertightening can cause the bolts or nuts to loosen and fail

Q6

Can I use a regular wrench to tighten bolts and nuts?

No, a regular wrench does not provide precise torque control and can result in overtightening or undertightening

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 envoy.

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

Torque Angle Gauge

Necessary for specific applications on the envoy, such as tightening crankshaft bolts. Measures the angle of rotation after reaching a specific torque value.

  • Precise angle measurement
  • Angle scale for reference
  • Easy-to-read dial indicator
Learn more
Service Procedures

Engine Cylinder Head Bolt Tightening Procedure

Technical procedure for properly tightening cylinder head bolts in a specific sequence to ensure proper sealing and prevent damage.

  • Clean and inspect cylinder head and bolts.
  • Apply appropriate lubricant to threads.
  • Tighten bolts in three stages to specified torque values.
  • Check torque again after engine has cooled.
View full procedure

Driveline Propeller Shaft Nut Replacement

Specific procedure for removing and replacing the driveline propeller shaft nut, ensuring proper torque and alignment.

  • Support driveline and remove cotter pin.
  • Loosen nut using a deep socket and impact wrench.
  • Install new nut and torque to specification.
  • Install cotter pin and stake nut.
View full procedure
Technical Service Bulletins

Front Suspension Lower Control Arm Recall

2005-05-12

Important safety recall notice regarding potential loosening of lower control arm bolts, affecting specific envoy models.

2003-2005 envoy XL

Resolution: Dealers to inspect and tighten lower control arm bolts to revised specifications. If bolts are damaged, the control arm must be replaced.

Steering Gear Torque Sensor Calibration

2008-07-11

Technical service bulletin addressing concerns with steering gear torque sensor calibration, leading to reduced power steering assist.

2002-2009 envoy

Resolution: Step-by-step instructions for calibrating the steering gear torque sensor, ensuring optimal power steering performance.

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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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