Re: 1958 Lark 35

[chris-p]

there is a seal on top of the impeller housing. A view of the hole is blocked by this seal. if you look up from inside the impeller housing, you will see it. It is a vent.

I have to ask, and don’t meant to be rude, but why would you drop the gearcase 4 or 5 times and not just install a new OEM impeller? Any new motor to me gets a new impeller, I don’t even try running them until I do that. After you have to pick chunks of rubber out of the cooling system when the blades break, you don’t want to do it again.

I would drop the gearcase, install a new OEM impeller, ensure the vent hole is clear. inspect the impeller housing, inspect the grommets too! They swell and reduce water flow. I like to buy them in bulk and change them as well too. Grease the water lines and the grommets before installing gearcase. This ensures that they don’t get pinched in there, restricting flow, and they slide up smoothly. Before installing gearcase, run compressed air up the water line, with the t stat and assembly out, and ensure good flow. Then back flush from the t stat housing down to the water line. If you are happy there are no restrictions, bolt her up.

Perhaps your t stat is failing? They usually stick open, but maybe yours is stuck closed, hence the overheat.

Again, make sure that white valve and spring are installed under the t stat, or the pump wont function right!