Cummins/Onan — Warm Up Engine Before Applying Load
Operation
From a Cummins/Onan service manual covering: GNH-250, GNH-XI0, GNHC4, GNVH450, GV12, GV12 series, GV12-525. Check it applies to your exact model before use.
Applies to: Cummins/Onan GV12
Procedure
- Run at 800 to 1000 rpm for 4 to 5 minutes or until water reaches 140°F.
- Operate at partial load at approximately 75% governed rpm until water reaches 160°F to 165°F.
- Apply load gradually until oil temperature reaches 140°F.
Specs & values
- oil temperature 140°F
- water temperature 160°F to 165°F
Full service-parts list: Cummins/Onan GV12 →
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.