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 MANUALSCHEVROLET1987FORWARD CONTROL 4.8 T, AUTOMATIC, 400/M40REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISCARBURETOR - ROCHESTER M4ME & M4MEF 4-BBLADJUSTMENTAIR VALVE ROD - FRONT
1987 Chevrolet Forward Control 4.8 T, Automatic, 400/M40
Air Valve Rod - Front
1987 Chevrolet Forward Control 4.8 T, Automatic, 400/M40SECTION Air Valve Rod - Front
- Plug diaphragm air bleed hole. See VACUUM DIAPHRAGMS . Using a hand-held vacuum pump, seat front choke vacuum break diaphragm. Make sure air valve is completely closed.
- Insert a .025" drill or pin gauge between rod and end of slot in lever. See Fig 1. Bend rod to adjust clearance. Remove tape and connect vacuum hose to diaphragm.
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.