KBW Transmisson Whining

[defiant1]

hi, have a C&C44 with 44hp yanmar and kbw 20 transmission. THe trans shifts fine and is quiet in reverse. When shifted to foward the trans whines and gets louder with rpms. Removed the trans and had new bearings installed, reinstalled trans and still whining in foward! ideas?

[GordMay]

Greetings and welcome aboard the CF, defiant1.

[delmarrey]

Are you sure it's the tranny?
Did you check the flex plate while the tranny was out?
Since it's only in forward, how far is the prop from the cutless/strut?
What type of shaft packing do you have?
Does it whine when tied to the dock and under power?
And when did you first notice the whining?

If it is the tranny, you can use a touch stethoscope to listen to which part of the tranny it's coming from.

[perchance]

Whining or howling can be the result of misaligned or improper gear lash. This is usually corrected by shimming under the bearings. This information should be in the shop manual for your transmission. Was the wear pattern on the gears checked when the tranny was apart?

[dial_amonkey]

Just wondering if gear lash noise would be heard if the engine has no load? Could I undo the coupling and put the engine into forward and rev to 2K - just to eliminate the cutlass bearing and the dripless seal bearing