Carburetor - ROCHESTER M4M Series 4-Bbl: Overhaul: Reassembly
- 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. To reassemble carburetor, reverse disassembly procedure, noting the following:
- Turn idle mixture adjusting screws in until lightly seated, then back out number of turns recorded during disassembly. If number 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.
- Lubricate air valve shaft pin with lithium-based grease where contacted by spring.
- 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 screws No. 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.
- The intermediate choke shaft lever and fast idle cam are installed correctly when the tang on lever is beneath the fast idle cam.
- Make all choke coil lever adjustments before installing choke cover assembly. A gasket is used between choke housing and choke coil cover on M4MC models, only. Surface contact is needed to provide a ground for electric choke on all other models.
- When installing choke cover, place fast idle screw on high step of fast idle cam and be sure that coil tang engages the inside coil pick-up lever. Install choke cover with rivets supplied in service kit.
NOTE:
Some models do not include screws 8, 9, 12 and 13.