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 MANUALSCHEVROLET1987STEP VAN P30, 7.4 W, AUTOMATIC, 400/M40REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISCARBURETOR - ROCHESTER M4ME & M4MEF 4-BBLOVERHAULREASSEMBLY
1987 Chevrolet Step Van P30, 7.4 W, Automatic, 400/M40
Carburetor - ROCHESTER M4ME & M4MEF 4-Bbl: Overhaul: Reassembly
1987 Chevrolet Step Van P30, 7.4 W, Automatic, 400/M40SECTION Reassembly
- To assemble carburetor, reverse disassembly procedure. Use new gaskets and seals. Make sure that new gaskets fit correctly. Make sure that all holes and slots are punched through and correctly located.
- Turn idle mixture adjusting screws in until lightly seated, then back out number of turns recorded during disassembly. If number is unknown, back out 3 turns as a preliminary adjustment.
- Install fuel inlet needle pull clip over edge of flat on float arm facing float. DO NOT hook clip in holes in float arm. Install plastic float bowl filler block after float level adjustment and before metering rod installation.
- When installing new pump plunger stem seal and retainer in air horn, lip on seal faces out. Lightly stake seal retainer in place at 3 locations, different from original stakings.
- When installing air horn screws, countersunk screws (2) are installed next to venturi area. Install secondary air baffle under screw Nos. 2 and 4. Tighten air horn screws evenly and in sequence. See Fig 1.
- Install accelerator pump rod link in hole of pump lever as noted during disassembly. Intermediate choke shaft lever and fast idle cam are installed correctly when tang ion lever is beneath fast idle cam.
- Make all choke coil lever adjustments before installing choke cover assembly. Place fast idle screw on high step of fast idle cam and be sure that coil tang engages inside coil pick-up lever. Install choke cover with rivets supplied in kit.
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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.