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 MANUALSGMC1984VALUE VAN P3500, 5.7 M, AUTOMATIC, 400/M40REPAIR AND DIAGNOSISENGINE MECHANICALMECHANICAL5.7L V8 - VIN [L]OVERHAULVALVE SPRING INSTALLED HEIGHTINSPECTION
1984 GMC Value Van P3500, 5.7 M, Automatic, 400/M40
Valve Spring Installed Height: Inspection
1984 GMC Value Van P3500, 5.7 M, Automatic, 400/M40SECTION Inspection
- Measure installed height from spring seat (or top of shim), to top of spring shield. Installed height should be 1 11/16-1 3/4" (42.85-44.45 mm) for intake valves, and 1 9/16-1 5/8" (39.70-41.28 mm) for exhaust valves.
- If installed height exceeds specifications, install a 1/16" (1.59 mm) thick shim between spring seat and spring. Installed height should never be more than specified height.
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.