If I were to use some kind of epoxy to rebuild the missing metal, I would drill a number of shallow holes at an angle using a tiny drill bit to give the epoxy a good secure bite into the base metal. In addition, I would mix in some fine glass fibers with the epoxy to help keep smaller chunks from cracking apart and flowing through the cooling system. That said, I don't think that I'd bother messing with it. I think that the only way you'd see any significant loss in cooling capacity is if the gouging is continuous from the outer portion of the housing to the inner portion, which would allow pressure backflow into the input portion of the impeller.
-- Brett in Portland, OR "Albert" '82 VanaFox I4 Riviera |
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