Thor Water Pump

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What sort of water pump is used in this ’37 Thor single? I’ve gone through the ignition and carb and I’m ready to fire it up. I don’t want to open the pump if it’s not necessary.

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[PM T2]

Its a simple piston-type with a check valve over top of the piston. The piston rides on an eccentric that is part of the propshaft.

I’d advise you to take it apart, if for no other reason than to make sure the check valve ball is free and moving around and that its seat is clean and free of corrosion. You can also verify that the return spring is not weak or broken at the same time, and also look to see if the piston is getting worn thin at the bottom where it rides on the eccentric.

Hope this helps.

best,
PM T2

He's livin' in his own private Idaho..... I hope to go out quietly in my sleep, like my grand-dad did..... and not screaming, like the passengers in his car...

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Thanks, T2. I guess that check valve rides on a cam on the propshaft. Looks easy. I’ll do it!

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