Cummins/Onan — Water Flow Adjustment
Adjustments · City Water Cooling
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Procedure
- With key provided, adjust valve to provide flow sufficient to keep water temperature gauge within 165°F to 185°F.
- Excessive water flow is wasteful; too little flow causes high temperature and automatic shutdown.
- Remove and store adjusting key to avoid unauthorized tampering.
Tools required
- key Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 165°F to 185°F
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.