I took the heat exchanger off with the intent of sending it to the radiator
shop but it was very clean and all tubes were clear so I gave it a quick
bath in some phosphoric (?) acid I had on hand. It came out very shiny. I
capped the ends and pumped in some air pressure let it sit over night for
each side to check for leaks. I would like to have a spare if you know of a
good used one.
-Allen