Join Date: Jun 2011
Location: somewhere south of civilization
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Re: Depression and thermostats
Blockage will / may / can mess up your cooling. Was there the correct amount of water being expelled with the engine running... that is a tell.
It could be a messed up pump impeller
clog at inside or outside the intake
could be junk in the strainer
corroded exhaust elbow
crude and clogged hose
whacked out t stat
I had similar and ruled out everything until it was the spendy elbow.
Not to be argumentative, but I don't think any of those would cause the temp to fluctuate wildly;
"Now my challenge is to figure out the overheating issue. That has me completely stumped. It’s erratic at best. Clearly the t-stat is working, I can see it going up and down. But from 100 to 190°f? It’s a raw water cooled engine and should run at 150°f. In the past few days I’ve seen it run at 100° hours, fast idle at 140 for 1& hours, run perfectly at high idle for a while, run from 120 to 170 and back about every 30 seconds for hours, and run from 100 to 190 and back about once a minute." which was one of his concerns, I believe.
"Any idiot can make a boat go; it takes a sailor to stop one." Spike Africa aboard the schooner Wanderer in Sausalito, Ca. 1964.
“Believe me, my young friend, there is nothing - absolutely nothing - half so much worth doing as simply messing about in boats.” ― Kenneth Grahame, The Wind in the Willows
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