Cummins/Onan 6.5NH - 3CR / 6000 A — Carburetor Assembly and Installation (Gasoline)

Repair & overhaul

For the Cummins/Onan 6.5NH - 3CR / 6000 A, from the Cummins/Onan service manual.

Applies to: Cummins/Onan NH engine

Procedure

1. Install the throttle shaft and plate with new screws and lock washers; on plates marked C, install with the mark toward the idle port.
2. Center the plate by backing off the top screw, closing the throttle lever and tapping the plate; tighten the screws.
3. Install the choke shaft and plate, centering as for the throttle plate; use new screws and lock washers.
4. Install the fuel inlet valve seat and valve.
5. Install the float and float pin, centering the pin so the bowl does not ride against it.
6. Check float level with the carburetor casting inverted.
7. Install the bowl ring gasket, bowl and bowl nut; tighten the main jet assembly securely, then back out 1 to 1-1/2 turns.
8. Install the idle adjusting screw finger tight, then back out 1 to 1-1/2 turns.
9. Install and adjust the choke.
10. Install the carburetor on the engine, connect the gasoline inlet and governor mechanism, and install the air cleaner hose.

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.

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