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 MANUALSCHEVROLET1983STEP VAN P20, 5.7 M, AUTOMATIC, 400/M40REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISCARBURETOR - ROCHESTER E4ME 4-BBLADJUSTMENTSAIR VALVE SPRING
1983 Chevrolet Step Van P20, 5.7 M, Automatic, 400/M40
Air Valve Spring
1983 Chevrolet Step Van P20, 5.7 M, Automatic, 400/M40SECTION Air Valve Spring
- Use hex wrench to loosen lock screw. Turn tension adjusting screw counterclockwise until air valve opens part way.
- Turn tension adjusting screw clockwise until air valve just closes. Then turn adjusting screw clockwise specified number of turns. See Fig 1.
- Hold adjusting screw and tighten lock screw. Apply lithium base grease to lubricate contact area.
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.