Cummins/Onan 5.5 NH / 6.5 NH — Gas-Gasoline Conversion

Operation · fuel system

For the Cummins/Onan 5.5 NH / 6.5 NH, from the Cummins/Onan operator's manual.

Applies to: Cummins/Onan NH engine

Procedure

1. Close the gaseous fuel shutoff valve in the supply line.
2. Open the gasoline fuel shutoff valve.
3. Set the spark plug gap as given in the Specifications section.
4. See that the choke is free and works easily; release the choke lock.
5. Start the engine; if it runs unevenly under half or full load, adjust the carburetor main jet.
6. To change back to gaseous fuel operation, reverse the above procedure.

Source: Cummins/Onan operator's 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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