Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1439 (ENGINE MECHANICAL - 5.3L (LM4))SPECIFICATIONSFASTENER TIGHTENING SPECIFICATIONS
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Fastener Tightening Specifications
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Fastener Tightening Specifications
WARNING: This page is about a different car, the 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 Chevrolet TrailBlazer, and 2004 Buick Rainier. However, it is still accessible from the selected car via links, so may be relevant.
Fastener Tightening Specifications
| Application | Specification | |
|---|---|---|
| Metric | English | |
| Air Cleaner Outlet Duct Bolt | 10 N.m | 89 lb in |
| Air Cleaner Outlet Duct Clamp | 7 N.m | 62 lb in |
| Air Conditioning Belt Tensioner Bolt | 50 N.m | 37 lb ft |
| Air Conditioning Bracket Bolt | 50 N.m | 37 lb ft |
| Battery Cable Channel Bolt | 12 N.m | 106 lb in |
| Brake Hose Retaining Bolt | 25 N.m | 18 lb ft |
| Camshaft Retainer Bolts | 25 N.m | 18 lb ft |
| Camshaft Sensor Bolt | 25 N.m | 18 lb ft |
| Camshaft Sprocket Bolts | 35 N.m | 26 lb ft |
| Connecting Rod Bolts - First Pass | 20 N.m | 15 lb ft |
| Connecting Rod Bolts - Final Pass | 75 degrees | |
| Coolant Temperature Gage Sensor | 20 N.m | 15 lb ft |
| Crankshaft Balancer Bolt - Installation Pass to Ensure the Balancer is Completely Installed | 330 N.m | 240 lb ft |
| Crankshaft Balancer Bolt - First Pass - Install a NEW Bolt After the Installation Pass and Tighten as Described in the First and Final Passes | 50 N.m | 37 lb ft |
| Crankshaft Balancer Bolt - Final Pass | 140 degrees | |
| Crankshaft Bearing Cap Bolts - Inner Bolts - First Pass in Sequence | 20 N.m | 15 lb ft |
| Crankshaft Bearing Cap Bolts - Inner Bolts - Final Pass in Sequence | 80 degrees | |
| Crankshaft Bearing Cap Bolts - Outer Bolts - First Pass in Sequence | 20 N.m | 15 lb ft |
| Crankshaft Bearing Cap Bolts - Outer Bolts - Final Pass in Sequence | 51 degrees | |
| Crankshaft Bearing Cap Side Bolts | 25 N.m | 18 lb ft |
| Crankshaft Oil Deflector Nuts | 25 N.m | 18 lb ft |
| Crankshaft Position Sensor Bolt | 25 N.m | 18 lb ft |
| Cylinder Head Bolts - First Design - First Pass all M11 Bolts in Sequence | 30 N.m | 22 lb ft |
| Cylinder Head Bolts - First Design - Second Pass all M11 Bolts in Sequence | 90 degrees | |
| Cylinder Head Bolts - First Design - Final Pass all M11 Bolts in Sequence - Excluding the Medium Length Bolts at the Front and Rear of Each Cylinder Head | 90 degrees | |
| Cylinder Head Bolts - First Design - Final Pass M11 Medium Length Bolts at the Front and Rear of Each Cylinder Head | 50 degrees | |
| Cylinder Head Bolts - Second Design - First Pass all M11 Bolts in Sequence | 30 N.m | 22 lb ft |
| Cylinder Head Bolts - Second Design - Second Pass all M11 Bolts in Sequence | 90 degrees | |
| Cylinder Head Bolts - Second Design - Final Pass all M11 Bolts in Sequence | 70 degrees | |
| Cylinder Head Bolts - M8 Inner Bolts in Sequence | 30 N.m | 22 lb ft |
| Cylinder Head Coolant Plug | 20 N.m | 15 lb ft |
| Differential Bolt | 85 N.m | 63 lb ft |
| Drive Belt Idler Pulley Bolt | 50 N.m | 37 lb ft |
| Drive Belt Tensioner Bolt | 50 N.m | 37 lb ft |
| Engine Block Coolant Drain Plugs | 60 N.m | 44 lb ft |
| Engine Block Heater | 40 N.m | 30 lb ft |
| Engine Block Oil Gallery Plugs | 60 N.m | 44 lb ft |
| Engine Coolant Air Bleed Pipe and Cover Bolts | 12 N.m | 106 lb in |
| Engine Flywheel Bolts - First Pass | 20 N.m | 15 lb ft |
| Engine Flywheel Bolts - Second Pass | 50 N.m | 37 lb ft |
| Engine Flywheel Bolts - Final Pass | 100 N.m | 74 lb ft |
| Engine Front Cover Bolts | 25 N.m | 18 lb ft |
| Engine Harness Bracket Nut | 10 N.m | 89 lb in |
| Engine Mount Bracket Spacer | 50 N.m | 37 lb ft |
| Engine Mount Frame Bracket | 100 N.m | 74 lb ft |
| Engine Mount Nuts | 50 N.m | 37 lb ft |
| Engine Mount-to-Engine Bolts | 50 N.m | 37 lb ft |
| Engine Rear Cover Bolts | 25 N.m | 18 lb ft |
| Engine Service Lift Bracket M10 Bolts | 50 N.m | 37 lb ft |
| Engine Service Lift Bracket M8 Bolt | 25 N.m | 18 lb ft |
| Engine Shield Bolt | 20 N.m | 15 lb ft |
| Engine Sight Shield Bolt | 10 N.m | 89 lb in |
| Engine Sight Shield Retainer Bolt | 5 N.m | 44 lb in |
| Engine Valley Cover Bolts | 25 N.m | 18 lb ft |
| Evaporative Emission - EVAP - Purge Solenoid Bolt | 10 N.m | 89 lb in |
| Exhaust Manifold Bolts - First Pass | 15 N.m | 11 lb ft |
| Exhaust Manifold Bolts - Final Pass | 25 N.m | 18 lb ft |
| Exhaust Manifold Heat Shield Bolts | 9 N.m | 80 lb in |
| Front Shock Upper Retaining Nut | 100 N.m | 74 lb ft |
| Fuel Rail Bolts | 10 N.m | 89 lb in |
| Fuel Rail Crossover Tube Bolts | 3.8 N.m | 34 lb in |
| Fuel Rail Stop Bracket Bolt | 50 N.m | 37 lb ft |
| Ignition Coil-to-Bracket Bolts | 8 N.m | 71 lb in |
| Ignition Coil Bracket-to-Valve Rocker Arm Cover Bolts | 12 N.m | 106 lb in |
| Intake Manifold Bolts - First Pass in Sequence | 5 N.m | 44 lb in |
| Intake Manifold Bolts - Final Pass in Sequence | 10 N.m | 89 lb in |
| Intake Manifold Wiring Harness Stud | 10 N.m | 89 lb in |
| J 42386-A Bolt. See Special Tools and Equipment . | 50 N.m | 37 lb ft |
| Knock Sensors | 20 N.m | 15 lb ft |
| Oil Filter | 30 N.m | 22 lb ft |
| Oil Filter Fitting | 55 N.m | 40 lb ft |
| Oil Level Indicator Tube Bolt | 25 N.m | 18 lb ft |
| Oil Pan Baffle Bolts | 12 N.m | 106 lb in |
| Oil Pan Closeout Cover Bolt - Left Side | 9 N.m | 80 lb in |
| Oil Pan Closeout Cover Bolt - Right Side | 9 N.m | 80 lb in |
| Oil Pan Cover Bolts | 12 N.m | 106 lb in |
| Oil Pan Drain Plug | 25 N.m | 18 lb ft |
| Oil Pan M8 Bolts - Oil Pan-to-Engine Block and Oil Pan-to-Front Cover | 25 N.m | 18 lb ft |
| Oil Pan M6 Bolts - Oil Pan-to-Rear Cover | 12 N.m | 106 lb in |
| Oil Pressure Sensor | 20 N.m | 15 lb ft |
| Oil Pump-to-Engine Block Bolts | 25 N.m | 18 lb ft |
| Oil Pump Cover Bolts | 12 N.m | 106 lb in |
| Oil Pump Relief Valve Plug | 12 N.m | 106 lb in |
| Oil Pump Screen Nuts | 25 N.m | 18 lb ft |
| Oil Pump Screen-to-Oil Pump Bolt | 12 N.m | 106 lb in |
| Propeller Shaft Yoke Retainer Bolt | 20 N.m | 15 lb ft |
| Spark Plugs - New Cylinder Heads | 20 N.m | 15 lb ft |
| Spark Plugs - All Subsequent Installations | 15 N.m | 11 lb ft |
| Throttle Body Nuts | 10 N.m | 89 lb in |
| Throttle Body Studs | 6 N.m | 53 lb in |
| Transmission Bellhousing Bolt | 50 N.m | 37 lb ft |
| Transmission Oil Cooler Line Bracket Bolt | 9 N.m | 80 lb in |
| Upper Ball Joint Pinch Bolt | 40 N.m | 30 lb ft |
| Upper Engine Mount Bracket | 50 N.m | 37 lb ft |
| Valve Lifter Guide Bolts | 12 N.m | 106 lb in |
| Valve Rocker Arm Bolts | 30 N.m | 22 lb ft |
| Valve Rocker Arm Cover Bolts | 12 N.m | 106 lb in |
| Water Inlet Housing Bolts | 15 N.m | 11 lb ft |
| Water Pump Bolts - First Pass | 15 N.m | 11 lb ft |
| Water Pump Bolts - Final Pass | 30 N.m | 22 lb ft |
| Water Pump Cover Bolts | 15 N.m | 11 lb ft |
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.