It's a tough little 3GM30F which ran pretty well for many many hours with
an unrevealed slightly leaky gasket which finally got worse enough to
overheat while motorsailing into a headwind off Canaveral last January. The
increasingly leaky head gasket (between cylinders 2&3 & the pushrod gallery)
started venting into the freshwater cooling side and blowing water out and
also deposited unburnt fuel or lube oil into the remaining coolant.
Messy -- and the low water level resulted in loss of cooling efficiency.
Sailed the rest of the way to Ft. Pierce, planed the head, ground the
valves, put her back together with a new gasket and now she starts
*instantly* and runs like a charm. The only prior symptom was slow starting
when cold. More of the gory details plus some photos are probably still in
the archives at that www.yanmarhelp.com site.

Scott
S/V Itchen


"Larry" wrote in message
...
"scott" jsodellatgmail.com wrote in news:12a2nvl97ipjtc6
@corp.supernews.com:

trouble figuring out an overheating problem with my 3GM30.

Good luck,
Scott



What was the cause of your overheating, Scott?