Cummins/Onan — Carburetor Assembly (Gasoline and Gas-Gasoline Only)
Repair & overhaul
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Before you start
- Forcing mixture adjustment screws tight will damage the needle and seat. Turn in only until light tension is felt.
Procedure
- Install throttle shaft and plate using new screws and lockwashers; bevel mated to body.
- On plates marked C, install with mark toward idle port; center plate by tapping with small screwdriver.
- Install choke shaft and plate, center in same manner as throttle plate.
- Install fuel inlet valve seat and valve.
- Install float, float pin, and float spring (begin Spec H); center pin so float bowl does not ride against it.
- Check float level with carburetor casting inverted (see Figure 18).
- Install main and idle mixture screw assemblies; turn in until lightly seated, then out specified turns.
- Install choke assembly.
Specs & values
- Float level: CCK/CCKA 1/4 inch (6.3 mm) with styrofoam float; CCKB Begin Spec H 1-3/16 inch (32-48 mm); CCKB prior to Spec H 11/64 inch (4.7 mm)
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.