Concerning the heat exchanger on the engine transmission, mine as well
had worn away. My Perkins has a Hurth transmission, and I contacted
Foley Engines (www.foleyengines.com or 800-23-FOLEY) and they sent out
an exact replacement. Ask to talk to Mr. Foley himself, he'll most
likely be able to tell you which model transmission you have if you
can describe it to him.
SM #5 "Spice"