Cummins/Onan B43 / B48 — Air Cleaner Service
Maintenance
For the Cummins/Onan B43 / B48, from the Cummins/Onan service manual.
Applies to: Cummins/Onan B48
Before you start
- A dirty air cleaner element can cause engine damage.
- Running engine without air cleaner element will result in engine damage.
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
- Wash polyurethane precleaner in water and detergent.
- Remove excess water by squeezing like a sponge and allow to dry thoroughly.
- Distribute two tablespoons of SAE 30 engine oil evenly around the precleaner.
- Knead into the precleaner to distribute oil evenly and wring out excess oil.
- Install precleaner over paper element.
- Replace inner paper element whenever it becomes excessively dirty or oily.
Specs & values
- Precleaner serviced every 25 hours of operation; more often under extremely dusty conditions
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.