Water thermostat seal

I put a new thermostat in my M1008 CUCV and cant get it to seal. I put gasket seal on both sides of the seal thumb tight; waited 1 hr.; torqued it to 30 psi and it dripped. Put seal in with out gasket sealant and it leaked worse. Bought new part the radiator hose attaches to; sealant on the radiator side of the gasket; torqued to 30 lbs.; still leaks. It leaks from the bottom of the seal. The radiator hose is tighten properly. Looked at the bolt holes on the engine and radiator side for cracks with a magnifying glass. Did not see any cracks. This should be a no-brainer; but. Any ideas?

Moved to the CUCV forum. Doesn't belong in the Forum Tips and Tricks.

Welcome to the site.

It is possible the the mounting surface is warped. Also which thermostat did you use? Possibly the wrong one and won't allow the housing to seal?

I recently had same thing happen with my 1009,even though hose clamp was tight the hose wouldn't tighten down,added a second clamp and no leak.Ordered a new hose next day,single clamp no leak.I couldn't see leak hot or cold but when I squeezed hose near housing it would shoot coolant out toward housing making it look like housing was leaking when it was hose all along.

Warthog said:

Moved to the CUCV forum. Doesn't belong in the Forum Tips and Tricks.

Click to expand...

But... but... but.... why not?


You want CUCV stuff in the CUCV forum????? That's just crazy talk!