Cummins/Onan B43 / B48 — Oil Filter Change
Maintenance · oil system
For the Cummins/Onan B43 / B48, from the Cummins/Onan service manual.
Applies to: Cummins/Onan B48
Parts for this job
Part numbers from the service-parts list for Cummins/Onan B48. Verify against your serial number before ordering; some links are affiliate links.
Procedure
- Spin off oil filter element and discard it.
- Thoroughly clean filter mounting surface and make sure new gasket is inserted in the element.
- Apply a thin film of oil to the gasket.
- Spin element down by hand until gasket just touches mounting pad, then turn down an additional 1/4-1/2 turn; do not overtighten.
- With oil in crankcase, start engine and check for leaks around filter element.
- Retighten only as much as necessary to eliminate leaks; do not overtighten.
Specs & values
- Refer to engine nameplate or Periodic Maintenance Schedule for oil filter change interval
Full service-parts list: Cummins/Onan B48 →
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.