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post #10 of Old 07-20-2007
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I just had this problem. It was a slowly leaking "rad" cap atop the heat exchanger. It was rated at 14 PSI: I got the same sized one for nine bucks at an auto parts store rated at 16 PSI. I'm glad I did (see below).

I use green "diesel coolant" at 100% strength. I must be doing something right, because my V-belt snapped when I was puttering to and from the poop dock, I didn't notice and the non-circulating coolant got to 230 F without boiling over or otherwise exploding.

But I sure as hell now know why they call it an "expansion" tank.

There are drain plugs usually on the front of the heat exchanger and/or at low points on the block in the cooling circuit. I have the shop manual for my engine (Westerbeke W-52) and I must say I refer to the thing about twice a month just to get used to all the extra crap on a bigger diesel when compared to an Atomic's a hell of a lot more engine.
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