Re: 1953 Evinrude FastTwin 15hp
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Rollpins, by their very design, are made of hardened steel, and as such rust much faster than mild steel. I’ve had 3 of these engines, and all 3 showed signs of significant erosion of the pin. One engine had the pin completely gone, leaving the impeller to spin (or not) freely on the shaft.
At the very least, I would take a close & serious look at that pin and make sure it’s in great shape and is engaging the impeller as fully as possible. It’s the only thing standing between boating fun and an overheated block.
On one of mine, I went the extra step of having a machinist friend broach a keyslot into the shaft so I had a real key turning the impeller. Call me “type A”, but at least I could sleep at night!