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 1312 (ENGINE MECHANICAL - 3.1L UNIT REPAIR)REPAIR INSTRUCTIONSVALVE LIFTER INSTALLATION
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Valve Lifter Installation
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Valve Lifter Installation
WARNING: This page is about a different car, the 2002 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
- Coat the valve lifters using prelube GM P/N United States 1052367, GM P/N Canada 992869 or the equivalent.
- Install the valve lifters in their original locations.
- Apply threadlock GM P/N United States 12345382, GM P/N Canada 10953489 or the equivalent to the threads.NOTE: Refer to FASTENER NOTICE .
- Install the valve lifter guides and guide bolts.
Tighten
Tighten the valve lifter guide bolts to 10 N.m (89 lb in).
RENDER: 1.0x
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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.