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Looking at the parts diagram I don’t see a seal there unless it was built into the Gear Housing Cap Cover #22
I will check again but I believe I have all the parts and in the correct order for the water seal on the back side. It doesn’t look like I’m getting much leaking into the gear case.
I’ll investigate tonight. I just don’t have the volume and pressure it needs. I was going to try to run it without the prop tonight just to see if it improves in some way. I have disassembled the prop and checked the holes and passage are clear from the prop to the hub.
Like I said, I think it’s a problem somewhere from the pump to The 90 transition and attachment to the upper portion of the motor. When I put the hose to the next section (the small hole in the tube going up the head) the head stays cool.
I wish, I could examine one of these motors in action. It seems almost impossible that this small eccentric pump could pump water all the way up through that head. I know it does but it’s hard to imagine.