I’ve got an interesting project going on…..actually a Mercury 2.5 EFI outboard engine that has suffered some salt-water incurred corrosion INTERNALLY….I’ve been fighting some water injestion into the block and believe there may be small pinholes or even a crack. I haven’t been able to locate it through pressure testing…may be heat induced. Running pressure is 15 lbs max. Rarely does the block get above 140 deg.
My thought was to heat the block with a heat gun, then pour in a sealant, swish it around then dump the excess.
Does this sound feasable? Recomendations for a sealant?
Do the classic restoration shops have to deal with aluminum corrosion in motors?