I'm mechanically challenged, but going to try the repair my self...
Don't worry, it's a very simple/straightforward task
...I cannot find a source for this part/Willing to go for used part. Any suggestions would be appreciated.
We have one - sorry, it's not for sale
- along with just about every other 3GM30F part, excluding the bottom-end and all we were looking for initially was a new starter-motor: The 3GM
engines are reaching an age when people have started to replace them, so why not ask around/post some 'wanted' notices at the local yacht clubs, marinas
and boat-yards for a complete engine
; it'll probably cost you less than a new heat-exchanger and you'll have all the other bits for future use. We bought a complete 30F engine
for $500 and spent a morning removing, cleaning
and stowing every bolt-on part from it - it was surprising how little locker/stowage space it required and the purchase
has already paid for itself twice-over. To be honest, the engine we bought was probably on the expensive side, as we were offered another for $350 with a promise that 'everything works' but the one we bought we could actually see running before handing over the cash, so we knew that all the bits were working.