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 MANUALSCHEVROLET1990LUMINA APV V6-191 3.1LREPAIR AND DIAGNOSISENGINE, COOLING AND EXHAUSTENGINECYLINDER HEAD ASSEMBLYVALVE GUIDESERVICE AND REPAIR
1990 Chevrolet Lumina APV V6-191 3.1L
Valve Guide: Service and Repair
1990 Chevrolet Lumina APV V6-191 3.1LSECTION Service and Repair
Valve guides are an integral part of the cylinder head and are not removable. If valve stem clearance becomes excessive, the valve guide should be reamed to the next oversize and the appropriate oversize valves installed. Valves are available in .0035 inch, .0155 inch and .0305 inch oversizes.
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.