Cummins/Onan 4MCCK / 605MCCK — Carburetor Assembly and Installation

Repair & overhaul

For the Cummins/Onan 4MCCK / 605MCCK, from the Cummins/Onan service manual.

Applies to: Cummins/Onan 605MCCK, Cummins/Onan MCCK, Cummins/Onan MCCK engine

Procedure

1. Install the throttle shaft and valve using new screws, with the bevel mated to the carburetor body.
2. Install the choke shaft and valve; center the valve in the same manner as the throttle valve.
3. Install the main nozzle (Spec A only), making sure it seats in the body casting.
4. Install the fuel inlet valve seat and valve.
5. Install the float and float pin, centered so the bowl doesn't ride against it.
6. Check the float level with the carburetor casting inverted.
7. Install the bowl ring gasket, bowl and bowl nut.
8. Install the load adjusting needle with its spring; turn in until it seats and back out 1 to 1-1/2 turns.
9. Install the idle adjusting screw finger tight, then back out 1 to 1-1/2 turns.
10. Reinstall the choke and adjust.
11. Install the silencer assembly and gasket.
12. Install the carburetor on the engine and connect the gasoline inlet, governor mechanism breather hose and choke.

Full service-parts list: Cummins/Onan 605MCCK →, Cummins/Onan MCCK →

Source: Cummins/Onan service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

More Cummins/Onan repair guides →