Cummins/Onan — Testing and Adjusting Engines (Preparation and Operation)
Testing & diagnosis
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Procedure
- Put proper oil in crankcase.
- Service air cleaner.
- Connect fuel line, load and a fully charged battery.
- Check ventilation for proper cooling.
- Start engine and check oil pressure.
- Run unit 15 minutes to bring up to operating temperature.
- Check for oil leaks, loose electrical connections, tight fuel lines and tight exhaust connections.
- Adjust governor for speed and sensitivity.
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.