"Vito" wrote in message ...
"Joe" wrote

Do you have a thermostat?

Yes, but it's working.

OK thats great. That is the close loop system.

Now here below what your talking about is your raw water system right?


The blockage is downstream after the water comes out
of the jacket around the exhaust manifold - probably in the cast iron
inverted U where it gets injected into the actual exhaust pipeing.

Diffrent pumps... different system.

The inverted U is called a rise. It is put there to keep water from
coming back on top of your pistons. Now unless you have the system
sealed you will not have enough pressure to overcome the standing
water in the rise. Seal it up, start it up, go outside and look. If
you can see it, not sure how your exhaust is ran it may be under
water. If your winterizing your raw water system that is the wrong way
to do it. What you wanna do is close your seasuction, open your
strainer start the engine as you pour antifreeze into the strainer,
That is if your strainer is properly mounted. This will fill the raw
loop to the riser.

Seldom will any exhaust pipe get clogged before the walls go.

Joe




Thanks for the suggestion.