I have the same set up. Check the space between the shaft and the packing nut. It should be equal on all sided when you rotate it by hand. Sense you checked everything else that would be my next move. Also make sure that your packing is not packed too much or non existent.
In addition, I would recommend that you don't leave your transmit ion in neutral while sailing. Drop it in reverse. Just make sure to remind yourself before you start up again. I usually put a glove over the top to remind me. If you choose not to drop it in reverse, you are most likely not going to do damage, however, over the long haul you might. Plus who wants to hear that spinning as well as feel that vibration. Also if you mark your shaft, you can go below and line your prop up for less drag. Good Luck and Smooth Sailing Sent on the Sprint® Now Network from my BlackBerry® -----Original Message----- From: "mwnmlr" <[email protected]> Date: Thu, 25 Mar 2010 01:56:10 To: <[email protected]> Subject: [IC27A] Alignment I have a M-18 Universal diesel and standard 2 bladed prop. Every year I have been getting a little more vibration and I am trying to track down the source. I had the usual things check such as cutlass bearing, prop balance, and engine mounts. I have heard that I should also check the prop shaft alignment. When I am sailing and have it in neutral the prop spins freely. Could it be out of alignment and prop shaft still spin easily?
