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Pulled the heat exchanger off my Kohler 5EOZ genny yesterday and pressure tested it last night.
I looped the seawater ports with one of the seawater hoses to close off the seawater side and I used the zinc port for pressure test. It takes a 1/4″ zinc so I used a 1/4″M to 1/8″F adapter bushing and then connected my 1/8″ fittings, gauge and schrader valve.
I put plastic bag material over the coolant ports this way if I did get a loss of pressure I would know if it was internal or if it was simply one of my test fittings. If internal, the loose plastic bag would tighten up.
It held 15psi for a several hours before I left the air out. Next I will acid clean (at 10:1) and then do the pressure test again. More to follow…..
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