Before you do any cutting of fiberglass check for the cause.
I do not know what type of boat you have and how old is your engine.
First you I would investigate more and try to minimize the vibration. The
vibration could be caused by all kind of things, engine tuning, mounts, head
casket, valves adjustment, air lock etc. If it does vibrates excessively
while turning the propeller your shaft alignment may be the cause.

"Reynaud" wrote in message
...

"Chris" wrote in message
oups.com...
Hi,

I noticed that during idling, my engine vibrates enough
to constantly hit the water pump on the fiberglass engine
foundation. The last two or three big jumps the diesel does
when stopped bang the water pump into the fiberglass really
hard.

So about about half an inch of the engine foundation has to go.
What is the best tool to cut really solid fiberglass, and how
do I do this? Any advice is appreciated.

Thanks a lot,

Chris


@#@ I use an sawzal Bosch, Milwakee and others make them.

Rey