Generac — Engine Storage Preparation

Maintenance

From a Generac service manual covering: GN-190, GN-220, NP-30G, NP-40G. Check it applies to your exact model before use.

Applies to: Generac NP-30G, Generac GN-190 / GN-220 engine, Generac GN-190 or GN-220 engine

Procedure

1. Start the engine and let it warm up.
2. After the engine is thoroughly warmed up, shut it down. If gasohol was used, turn off the fuel supply and let it run out of gas.
3. While the engine is still warm, completely drain the oil, then refill with recommended oil.
4. Attach a tag to the engine indicating the viscosity and classification of the oil in the crankcase.
5. Remove the spark plug and pour about one (1) ounce (15ml) of clean engine oil into the spark plug opening; crank several times; install and tighten the spark plug.
6. Remove the battery and store it in a cool, dry room on a wooden board; never store on a concrete or wood floor.
7. Clean and wipe the generator exterior surfaces.

Full service-parts list: Generac NP-30G →

Source: Generac 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 Generac repair guides →