Found out heat exchanger
is shot. There was red area around salt intake and tube feeding salt. Obvious electrolytic corrosion
. Found posts online that said everything from 4 pencil zincs in cooling
system others said none. One plug
in old heat exchanger looked like could have been zinc. After checking Perkins marine diesel
shop manual, shop manual and boats manual still no mention of zincs. The aftermarket exchanger was made by champ and is copper, manual says original was aluminum
. Well zinc or no zinc that's the question. New one ordered from inet boatsman marine
. Will be curious to see if zinc is installed.