Cummins/Onan 5.5 NH / 6.5 NH — Out-Of-Service Protection
Maintenance · generator set
For the Cummins/Onan 5.5 NH / 6.5 NH, from the Cummins/Onan operator's manual.
Applies to: Cummins/Onan NH engine
Before you start
- Hot crankcase oil can cause burns if spilled or splashed on skin. Keep fingers and hands clear when removing the oil drain plug and wear protective clothing.
Procedure
- Run the engine until it reaches normal operating temperature.
- Turn off the fuel supply and run the engine until it stops.
- Disconnect battery and store in a cool dry place.
- Drain oil from oil base while the engine is still warm; refill with fresh crankcase oil and attach a tag stating viscosity used.
- Remove spark plugs; pour 1 ounce (2 tablespoons or 28 grams) of rust inhibitor or SAE #50 oil into the cylinders; crank the engine over a few times; reinstall spark plugs.
- Service air cleaner as outlined in the Maintenance section.
- Clean governor linkage and protect by wrapping with a clean cloth.
- Tie a plastic bag over the exhaust outlet to prevent entrance of moisture, dirt, bugs.
- Wipe entire generator set; coat rustable parts with a light film of grease or oil.
- Provide a suitable cover for the entire unit.
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.