You don't need, in fact you shouldn't open the valve all the way open when
running it from a hose.

--
Bill
Chesapeake, Va


"Jim and Becky" wrote in message
...
I've got a 350 Mercruiser inboard with a closed cooling system.
We have such high municipal water pressure that the garden hose blew out
the
gasket of my raw water flow sensor.
Next time I'll install a shut off valve near the end of the garden hose so
I
can stop the water flow when the engine isn't running.
Anyone seen this problem? It also made one of the raw water filter
connections leak. Double clamped too.
I don't think you ever get that much pressure on the cooling system with
normal use.

Also, I used 1 part anti freeze to 3 parts water for the closed cooling
system. This was based on advice from a guy at Holt heat exchangers. I
trust him completely. Any opinons on this anti freeze ratio?

Other wise it started right up as soon as I remembered to open the fuel
shut
off valve....

"WRH" wrote
You don't need, in fact you shouldn't open the
valve all the way open when running it from a hose.

Which brings up the question, "how much is enough?" I test ran my boat a
week ago and noticed the temp was a few degrees higher than expected. I
opened the valve a little more and the temp gauge settled down to it's
accustomed place. (I use a cheesy little plastic in-line ball valve between
the end of the hose and the earmuff to fine tune.)