Cummins/Onan — Oil Filter Changing Procedure
Maintenance
From a Cummins/Onan operator's manual — check it applies to your exact model before use.
Applies to: Cummins/Onan NHEL
Before you start
- Incorrect replacement of service parts can result in damage to equipment. Use genuine Onan replacement filters only.
Parts for this job
- 122-0800 Oil filter Amazon eBay $31.23 FridayParts $39.99
Part numbers from the service-parts list for Cummins/Onan NHEL. Verify against your serial number before ordering; some links are affiliate links.
Procedure
- Place an oil pan under the oil filter location on the engine.
- Turn the old filter slowly counterclockwise, wait for oil to stop draining, then remove the filter.
- Replace the oil filter only with a new Onan-approved oil filter; coat the new filter gasket lightly with clean engine oil.
- Turn the new filter clockwise until its gasket just touches the filter mounting base, then tighten an additional half turn.
- Wipe up excess oil.
Tools required
- oil pan Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Tighten an additional half turn after gasket contact
Full service-parts list: Cummins/Onan NHEL →
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.