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.
ROCHESTER M & MV Single Barrel: Overhaul: Disassembly: Notes
- Remove choke lever from shaft, lever from rod, and rod from slot in fast idle cam.NOTE: Remember position of rod in relation to levers for reassembly, then rotate rod to remove.
- Remove air horn attaching screws, remove air horn, invert, and remove air cleaner bridge. Remove vacuum break diaphragm cover screws, retainer, diaphragm and plunger rod by holding choke valve open, pushing upward on diaphragm rod until eyelet slides off wire lever on choke valve, and removing diaphragm plunger rod through hole in air horn.
- If necessary for parts replacement, choke valve, vacuum break lever, and choke shaft can be removed by removing choke valve screws.NOTE: Remove staking on screws by filing. Choke shaft may be damaged if staking is not removed.
If necessary, remove idle vent valve by turning screw head out of plastic guide.
NOTE: Do not attempt to remove cranking enrichment valve. - Remove float bowl gasket, lift up on float hinge pin to remove float assembly, and remove hinge pin from float arm.
- Remove float needle, then float needle seat and gasket.CAUTION: To prevent damage to needle seat use a screwdriver which completely fills slot.
Remove fuel inlet nut, gasket, paper filter element, and pressure relief spring.
- Use long nosed pliers to remove "T" pump discharge spring retainer. Pump discharge spring, ball, and idle tube can be removed by inverting bowl.
- Remove actuating lever on throttle shaft, remove upper end of drive link from power piston rod (for Oldsmobile synchro-mesh carburetors, see Note below), then rotate drive link from keyhole in actuating lever. Rotate pump link to remove from actuating lever, then remove upper end of pump link by rotating from keyhole in pump slide. Both power piston and pump assembly should be held down in float bowl, when removing links, as they are spring loaded.
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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.
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