I have a 1982 2GM that is till raw water cooled. Have toyed with the idea of changing it to fresh water, but a few thing have kept me from doing it
1. cost. hate to spend $500 + on parts, when I may get a new engine in a few years, if anything big goes on this one.
2. Temperature - it has ran for 25 years at 130 degrees. Although diesels work better at 180 degrees, I am not sure it would like the change after all these years???
3. Not sure what pump
to use. I thought I read that the rubber impellers (in raw water pumps
) are damaged, or swell up, from antifreeze (when preparing for winter). Canm someone shed some light on whether it's best to get a new pump
for the raw water (and use the old one for antifeeze) or vice-versa. if so, what type / model pump
would be a good choice? I can't tell by pics which are shaft driven, and which can have a pulley on them!
4. where to find a heat exchanger. How to size one? Or, would an oil cooler work?