Tom, I had the same symptoms on Cat’s Paw last fall. Turned out that the rubber bellows was probably quite old and was very stiff. You might consider a new bellows and SS rotor from PYI. They also sell an additional SS clamp which is attached just in front of the rotor and which clamps onto the shaft, like a zinc anode on the prop shaft. So it is a good safety that does not depend on the set screws. A pain to replace the bellows but it completely solved the problem. PYI recommends changing the bellows every few years.
Eric Frank Cat's Paw C&C 35 Mk II Mattapoisett, MA > 2 Dripping dripless bearing > > In March when I had her bottom painted I had the yard (Seaview West > in Seattle) install a brand new dripless bearing. As a result of the > bilge switch issue I decided to check the bilge on the 2 hour run > back yesterday. The bilge was substantially filled. I traced the > ingress to the dripless bearing which was spewing water > everywhere. Not enough to outpace the electric bilge pump or require > whalegusher intervention. After we docked I checked and the rotor > was loose enough for me to turn it on the shaft. I am getting the > documentation from the yard to make sure I get the right parts, but > as I understand it, I should not just tighten the set screws, but > replace them to be sure they bite, then use a 2nd set crew and lock > tight to lock them in place.
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