"Radman" wrote in message
oups.com...
Hello again all,

I have a question that I'm hoping someone can answer for me.

I needed a new water pump for my boat, it has an OMC 3.8L V6 (GM 229
3.8L V6)so I did some pricing and a new (BOAT)water pump was around
60.00-160.00 depending on were you bought it. So I went to my local
Autoparts store and brought the old water pump with me and after some
searching found one that looked the exact same, bolt holes,
inlets/outlet, everything the same... It was actually for an 1970 307
Gm motor, got it for 25.00 new... What I'm now wondering is will it
mater if it (waterpump) was designed for a boat or car, are there any
differences, is the rotation differnt???? Just want to make sure before
installing it and running the motor.. Thanks for any info you guys can
give me....

Radman............



In regard to the cooling systems, one of the major differences is found in
the water-circulating pump. This is especially noticable when you have a
raw water cooled engine. Unlike their automotive counterpart, a marine pump
works in an open cooling system. This type of system is extremely corrosive
to the pump. Therefore, the pump must be altered for longevity. A marine
pump has a special ceramic seal, stainless steel backing plate, and a bronze
impeller to resist corrosion. An automotive style pump, with its stamped
steel impeller, would fail due to corrosion in a short time.

http://www.boatfix.com/how/marineeng.html