timgc78
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Anyone have an explanation on how the thermostat seal works in the 250 cummins?
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5 ton cummins thermostat seal
- Thread starter timgc78
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It's a rubber o ring that rides in the grave around the thermostat
timgc78
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That's interesting. The seal with the 201737 thermostat is a metal clad lip seal. The parts book shows it going in the housing before the thermostat.
Its a spacer depending on the thermostat type
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The rubber seal at the bottom of the stat, the bulb end, seals outside leaks. The thermostat seal, the lip seal down in the housing, prevents leakage form the block loop to the cooling loop. If the seal wasn't there, there would be a slow steady overheat condition because the path of least resistance in the cooling system is back to the water pump inlet. The seal forces the coolant into the outlet of the engine and into the radiator. Coolant flow after the head gaskets is mostly flow, no pressure, other than the pressure the cap creates to raise to air to boil point. Without the stat or seal, the coolant will follow the suction back to the water pump.