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Old 04-22-2013, 08:55 PM   #433
Capthead
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City: Long Beach, CA
Country: USA
Vessel Name: Heads Up
Vessel Model: Grand Banks 42 Classic
Join Date: Mar 2013
Posts: 950
Thanks for explaining the concern. I have always seen the temps at 180 almost the entire time I had it except when it started overheating which was a very slow process. This, of course before the change over to synthetic. I never found out what exactly caused the overheating and I had the old heat exchangers flushed and pressure tested, changed the impellers in my raw water pump and even flushed the fresh water system once before changing everything out. I bought four thermostats and changed then twice.

I didn't want overheating because I knew that would kill those diesels. When I saw the drop to 175 I was rejoicing actually. That was 1994 or 95. I've put thousands of miles on the boat since then and fished from Santa Barbara to Dana Point. I'm not going to worry about it and I still have the two extra thermostats. They just don't have a hole in them for bleeding the air.

Thanks again.
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