I have a 96 Sanger. Way back when I changed mine for the first time, the shop asked if it had ever been changed before (didn't know because I'm second owner). They suggested pulling the housing because the boat was originally fitted with a plastic housing (or maybe it was a plastic cover....something was plastic) and the shop said they see a lot of original housings crack. When I pulled mine, sure enough it had a small crack. It didn't cause any problems because I got to in time. I took their recommendation and changed the housing (a better one was available), along with the impeller. Subsequent changes have been impeller only.
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