My Power Major antifreeze foams when the engine gets warmed up. I feared another blown head gasket, but thought that maybe the thermostat was not opening properly or the radiator was partially plugged or the water pump wasn't working. Here's what I've done so far.1. Tightened the fan belt. Thought maybe it was slipping under load. No help. 2. Checked thermostat. Seems to work fine. Would have installed a new one, but the local Ford dealer didn't have one in stock. The old one had some "gunk" on it. Thought that maybe the "gunk" kept it from operating properly. Cleaning the t-stat didn't seem to help. 3. Checked that the water pump shaft is turning, but didn't pull it out of the tractor. Still suspect that cooling fluid is not circulating correctly, but can't tell for sure. 4. Removed the radiator and flushed it with water. It seems to be clear. It was rebuilt several years ago. 5. Reassembled tractor without the t-stat and the O-ring that makes the old radiator pressure cap seal properly. It runs for a bit , then antifreeze foams when it gets warned up. Suspect that low pressure might cause antifreeze to boil, not sure. I could use some suggestions. I don't really want to hear "replace the head gasket again". Been there. But, I need to get the ole girl running well again. She's my main work horse. My real work horse, a black Percheron thinks he's in retirement, fat and lazy (my fault).
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