Cummins/Onan — Replacing the Air Filter Element
Maintenance
From a Cummins/Onan owner's manual covering: 3.3 KY, 3.6 KY, 4.0 KY. Check it applies to your exact model before use.
Applies to: Cummins/Onan 3.6 KY, Cummins/Onan 4.0 KY
Before you start
- Do not overtighten wing nuts, can distort the filter element
Parts for this job
- 0140-3280 Air filter — Cummins/Onan 3.6 KY Amazon eBay $20.00
- 0140-3280 Air filter — Cummins/Onan 4.0 KY Amazon eBay $20.00
Part numbers from the service-parts lists for Cummins/Onan 3.6 KY, Cummins/Onan 4.0 KY. Verify against your serial number before ordering; some links are affiliate links.
Procedure
- Remove the front access cover
- Remove the wing nut securing the air filter housing cover and remove the cover
- Remove the wing nut securing the filter cover plate and remove the cover plate
- Remove the air filter element
- Install the new air filter, centered over the carburetor air inlet
- Replace the filter cover plate and tighten wing nut
- Replace the air filter housing cover and tighten wing nut
- Replace the front access cover
Full service-parts list: Cummins/Onan 3.6 KY →, Cummins/Onan 4.0 KY →
Source: Cummins/Onan owner'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.