Reply To: Making a test plate for a Johnson RD-24 and others

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July 6, 2019 at 11:14 am #178492
frankr
Participant

    Yes, a non-rotating impeller will block the flow. As for the other tests you have invented, I’d have to ponder on those a bit. Are you aware that that is a re-circulating system? Water returns to the pump INLET side, through the second water tube when the thermostat is closed. I guess that is what is happening when you are dumping water into the head. BTW, that plastic thermostat housing and check valve must be in place for the system to operate properly. Without those parts, exhaust can travel down through the second water tube and enter the pump.