Facts About Generators
GeneratorsDirectoryCompareRepairEnginesControllersPartsManufacturersGuides
Search models or part #
Home›Repair guides›Cummins/Onan›Out-of-Service Protection (over 30 days)

Cummins/Onan NH-MS/1 / NH-S/1 — Out-of-Service Protection (over 30 days)

Maintenance · Engine

For the Cummins/Onan NH-MS/1 / NH-S/1, from the Cummins/Onan service manual.

Browse Cummins/Onan generators & specs →

Before you start

  • If a battery is used, disconnect it and follow standard battery storage procedure.

Procedure

  1. Run the unit until thoroughly warm.
  2. Turn off the fuel supply and run until the unit stops.
  3. Drain oil from the oil base while still warm; refill and attach a tag stating the oil viscosity used.
  4. Remove each spark plug and pour one ounce of rust inhibitor (or SAE #50 oil) into each cylinder.
  5. Crank the engine slowly by hand several times, then install the spark plugs.
  6. Service the air cleaner and clean the governor linkage, protecting it with a clean cloth.
  7. Plug the exhaust outlet and wipe the entire unit, coating rustable parts with a light film of grease or oil.
  8. Provide a suitable cover for the entire unit.

Specs & values

  • One ounce (two tablespoons) of rust inhibitor per cylinder

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 →