Cummins/Onan B48 — Break-In Procedure
Maintenance · Engine
For the Cummins/Onan B48, from the Cummins/Onan service manual.
Applies to: Cummins/Onan B48, Cummins/Onan B48M engine
Before you start
- Using wrong grade or weight of oil during break-in can cause engine damage
- High engine operating temperatures during break-in can cause damage
Procedure
- Run engine at half load for first three hours
- Intermittently apply full load to control engine break-in
- Check oil level at least every five operating hours
- Add oil to keep at proper level but do not overfill
- Maintain proper cooling and lubrication throughout break-in
Specs & values
- Use proper grade and weight oil for break-in
- Avoid high engine operating temperatures
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.