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That center shaft piece is pressed on. Take measurements on it before you drive it out of the impeller. There is a member who makes new impellers for this. He needs the old impeller core. Brian Wilcox is the name I believe. I wonder what fluid that gearcase needs. I put 30wt non detergent oil in mine. It doesn’t seem to slip as it should.
You are correct sir, upon closer examination I can see that the rubber impellor does indeed have a metal (steel ? ) hub that is pressed onto the shaft. We here in S-E Michigan know Brian Wilcox of Algonac well… a very talented and most helpful fellow. We were just together for a meet in nearby Marine City. You can meet us all in the next issue of the “Antique Outboarder”
“Membership surely has benefits”
Thanks for the tip,
Joe B