"Denny" wrote in message
oups.com...
If it ain't broke don't fix it!
Make sure there is a new anode on the engine and then run it until it
fails - or until you trade the boat off for a new one (which is far
more likely scenario)....

denny


Change BOTH anodes. Our engine 2-cyl has one in front where water enters
block and one at rear on cylinder head. The front one is easy to get at -
located on a splitter pipe where water from pump enters block. Rear one not
so easy to get at - located on cylinder head!

Not sure about the 3-cyl diesel, but our 2-cyl has a front plate on head
that serves as the alternator support and another plate at the back that has
the second anode and the temperature sensor. These plates can be removed and
this exposes the inside flow cavity of the head. Our engine had some scale
and rust build up just inside these plates - I scraped it away, but the
metal below looked pretty solid. If the engine has been rebuilt, one would
think that these plates would have been removed - It may be worth having a
look (at least at the front one) and seeing if the passages are clean
inside.

GBM