Hey Spareparts

[Big Grouper]

Is one of your prop blades dinged or nicked? Trimmed all the way in is running the prop at an angle that will bring to life any imperfections.

[cfelton]

Im pretty sure its the coupler. It vibrates when running on the water hose in the yard, with the drive in neutral. I can shake the drive shaft inside the coupler. Does anybody know what the torque is suppose ta be on the rear motor mount bolts and the torque on the single nut on the front motor mount ? I cant find the torque settings for these mount bolts in any of my manuals.Thanks!

[spareparts]

I can't remember what the torque spec was on those bolts, we rarely used a tourqe wrench on the rear bolts as most engien compartments didn't allow room for a straight extension and a torque wrench. I ususally had to settle for a swivell socket and my 3/8 impact. If I had to guess, arond 45-55 ft/lbs.
you kind of lost me on your description of whats going on here. You say you can reach in and move the drive shaft? Meaning you can reach behind the motor, between the transom and the engine bell housing and move the drive shaft? If you can do that, yeah sounds like you found your problem. You should also be able to look into the coupling hub with a flash light(drive removed) and inspect the splines in the coupler, they should be uniform with square peaks, if they look sharp on the peaks, the coupler is worn out, don't forget to check the input shaft for wear as well. The splines should bear square in shape as well, if they look sharp on the peaks, its worn. When r[placing the coupling, or any time the drive is removed, use specified drive coupler grease on the splined shaft