Rattles at 1900 rpm

[lgsailor19]

I recently had the cutlass bearing changed, and the prop reconditioned on my Catalina 30. Starting about 1900 rpm there is a rattle, which gets progressively more pronounced as I increase power. When I am in neutral, there is no rattle. Any experience or ideas here?

[paulk]

Do you have a fixed or folding prop? If it''s a folding prop, it sounds like one blade isn''t open all the way. To fix this on our boat we put the boat in reverse for a shot, to get the blades to open fully, and then quickly shift to forward. If you''ve got a fixed prop, it sounds like things may be out of alignment..... If it''s not the motor mounts (the first thing to check), it gets less and less fun after that.

[Denr]

I''m guessing its a fixed three blade on your boat. I would check the bolts on the transmission coupling flange and the key/keyway in the coupling itself. Make sure the square headed bolt holding the key in position is tightened and wired in position.