Cummins/Onan B48 — Air Cleaner Maintenance
Maintenance · Fuel System
For the Cummins/Onan B48, from the Cummins/Onan service manual.
Applies to: Cummins/Onan B48, Cummins/Onan B48M engine
Before you start
- Failure to wring out excess oil may reduce engine horsepower
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
- Check and clean air cleaner element every 25 hours
- Clean by gently tapping element on flat surface
- Replace element every 200 hours
- For pre-cleaner: wash in water and detergent, squeeze dry
- Allow to dry, then coat evenly with two tablespoons (28 grams) of SAE 30 engine oil
- Knead into and wring excess oil from pre-cleaner
- Reinstall over cartridge
Specs & values
- Clean interval: 25 hours
- Replace interval: 200 hours
- Use SAE 30 oil for pre-cleaner coating
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.