The Heat Exchanger (16/1)
utilizes cupro-nickel tubes. They should last for the life of the generator. However, the tubes can become clogged with silt and sea water contamination. To clean the tubes, remove the End Caps and gaskets on each end. Clear the tubes by pushing a stiff rod through them. Do not use a rod diameter greater than 11/64".
The Heat Exchanger contains a sacrificial Zinc Insert in a plug (16/2)
. Examine it when checking the valve clearance and replace, as necessary. The Zinc is a readily available Type 1A.