Cummins/Onan — Draining Excessive Oil

Maintenance · Engine oil

From a Cummins/Onan service manual covering: C13 N6H, C13N6H, C17 N6H, C17N6H, C20 N6, C20N6H, RS13A. Check it applies to your exact model before use.

Applies to: Cummins/Onan C13 N6H, Cummins/Onan C17 N6H, Cummins/Onan C20 N6, Cummins/Onan RS13A

Procedure

1. Remove the access panels to get to the drain hose.
2. Place the end of the drain hose into an appropriate container.
3. Open the oil drain cap to release oil from the engine into the appropriate container.
4. Re-check the engine oil level. Based on the results, add or drain oil.
5. When a sufficient amount of oil has been drained, close the oil drain cap and wipe it clean.
6. Re-install the access panels. Torque the fasteners 3.5 - 5.0 ft-lb (5.0 - 6.6 Nm).
7. Dispose of the used oil in accordance with local and state regulations.

Full service-parts list: Cummins/Onan C20 N6 →

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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