Cummins/Onan — Thermostat - Replace
Repair & overhaul · Cooling System
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Procedure
- Disconnect battery cables, engine wiring harness, fuel lines, exhaust hose, coolant hoses
- Drain and refill engine fluids
- Remove soundshield
- Remove coolant hoses
- Remove thermostat cover and gasket
- Remove thermostat
- Install thermostat, cover and gasket
- Test run unit
Specs & values
- SRT 08-104: 1.5 hours at Accessibility Code B
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.