We have our 1976 Catalina 30 "Amici" hauled out to do a bunch of work, including replacing the cutlass bearing....which required cutting off the old prop shaft coupling and buying a new split coupling.
Engine is a Yanmar 2GM. The machinist squared the face of the coupling to the shaft, and when i went to install it yesterday the faces of the shaft coupling and the transmission output flange would not meet...there was a 6mm gap in between.
Looking closer, I could see that:
1) The tranmission output shaft sticks out proud of the flange
2) the prop shaft sits proud of the "inner" face of the shaft coupling (the coupling has a recessed area in the middle to mate with the transmission...and the shaft is proud of that recessed part, but not proud of the "outer" face of the coupling). I seemed to remember that previously, the shaft was flush with the inner face of the coupling...but im not sure.
It appears that i need to either:
1) move the shaft forward in the coupling, which is not possible bc of the location of the set screw
2) cut the shaft shorter
3) adjust the tranmission output flange so that it moves further aft and the shaft is no-longer proud of the output flange face.
Does anyone have any ideas about which of these is the natural state of things? Should the shaft be flush with the "inner" face of the flange? Should the tranmission output shaft be flush with the face of the output flange? Anyone have direct experience?
Thanks so much for your help! We are trying to splash her today