Finally got all the parts rounded up and started working on the engine. Disassembly went well.
When I was cleaning the coke/carbon out of the heat exchanger I found a hole through the casting into the water jacket from the exhaust area. Yanmar is pretty proud of their heat exchanger tanks.
Once the head was off I found water in the #1 and #2 cylinders and rusty water around the stud next to the #1 cylinder. The gasket appeared intact, but it looks to me like water has been migrating around the gasket. Here's a couple of pics:
This first one is of the cylinder head --
This is looking down into the cylinders --
And this last one is a closer look at the #1 cylinder --
I took the pics right after removing the head without doing any cleanup, etc.
Is this what a bad head gasket looks like?
Pacific Seacraft "Crealock" 37 #312
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Last edited by sailak; 08-06-2010 at 01:15 PM.