speaking of Betas; length of shaft between prop and cutlass bearing

When we mounted my Beta Marine last year we had to push the prop shaft out some. I remember Joe saying that the distance must be no more than the diameter of the shaft between the cutlass bearing and the prop. Unfortunately I have a 1 inch shaft and about 1 3/4 of shaft before the prop that I didn't notice until the engine was muscled in and attached. I get a rumble at 2200-2400 RPMs and cannot tell if it is a muffler rattle or something else. After putting about 45 hours on the engine last year (trips to Canada with little wind) I have no play (wear) in my cutlass bearing, but I also back off the throttle when I get that rumble. Could that extra shaft length be the noise, and ultimately a big problem? Thanks for you expertise as always. Bob Connell "Jollygood!", Cal 31, #59 Shilshole Bay, WA

On 5/10/2012 5:17 PM, Bob Connell wrote: > > > When we mounted my Beta Marine last year we had to push the prop shaft > out some. I remember Joe saying that the distance must be no more > than the diameter of the shaft between the cutlass bearing and the > prop. Unfortunately I have a 1 inch shaft and about 1 3/4 of shaft > before the prop that I didn't notice until the engine was muscled in > and attached. I get a rumble at 2200-2400 RPMs and cannot tell if it > is a muffler rattle or something else. ******** Recheck engine alignment. Also ensure the engine is not contacting the hull or engine bed, except by the 4 flexible engine mounts. Use a wood ruler [ or similar shaped wood piece ] and pass it between the engine and hull. There should be no binding or contact. > After putting about 45 hours on the engine last year (trips to Canada > with little wind) I have no play (wear) in my cutlass bearing, but I > also back off the throttle when I get that rumble. Could that extra > shaft length be the noise, and ultimately a big problem? ******* It is possible, as the shaft "overhang" is more than 1 shaft diameter. *Joe DeMers - owner* Sound Marine Diesel LLC SoundMarineDiesel.com <http://www.soundmarinediesel.com/> *phone & fax (860) 666-2184* > Thanks for you expertise as always. > Bob Connell > "Jollygood!", Cal 31, #59 > Shilshole Bay, WA > > > > > No virus found in this message. > Checked by AVG - www.avg.com <http://www.avg.com> > Version: 2012.0.2171 / Virus Database: 2425/4989 - Release Date: 05/10/12 > -- *Joe DeMers - owner* Sound Marine Diesel LLC SoundMarineDiesel.com <http://www.soundmarinediesel.com/> *phone & fax (860) 666-2184*