Just another Moderator
Join Date: Sep 2005
Location: New Westminster, BC
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The fact that it holds a zinc points to this being your coolant heat exchanger and, yes, the pencil zinc could well need replacement. The bigger question is why oil leaked out if this unit (if in fact that's where it came from)
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)