Cummins/Onan — Cooling System Maintenance (Air-Cooled)
Maintenance
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Before you start
- Overheating and permanent damage can result from as little as one minute of operation without the air housing.
Procedure
- See that nothing obstructs airflow to and from the engine.
- Keep cooling fins (cylinder block and cylinder heads) clean.
- Verify air housing is properly installed and undamaged.
Specs & values
- Clean cooling area normally every 1000 hours, more often under dirty conditions
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.