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 ROCKER ARM AND PUSH ROD INSTALLATION
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Valve Rocker Arm and Push Rod Installation
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Valve Rocker Arm and Push Rod 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.
Tools Required
J 36660-A Torque Angle Meter
- Install the lower intake manifold gaskets.
- Coat the ends of the push rods using prelube GM P/N United States 1052367, GM P/N Canada 992869 or the equivalent.IMPORTANT: The intake valve push rods measure 146.0 mm (5.75 in) in length, (yellow).
- Install the push rods in their original location.
The exhaust valve push rods measure 152.5 mm (6.0 in) in length, (green).
- Coat the rocker arm friction surfaces using prelube GM P/N United States 1052367, GM P/N Canada 992869 or the equivalent.IMPORTANT: Shims may be required under the valve rocker arm pedestals if reconditioning has been performed on the cylinder head or its components.
- Install the valve rocker arms in their original positions.NOTE: Refer to FASTENER NOTICE .
- Install the valve rocker arm bolts.
Tighten
Use the J 36660-A to tighten the valve rocker arm bolts to 19 N.m (14 lb ft) plus 30 degrees.
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.