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Old 02-06-2012, 03:14   #1
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KBW Transmisson Whining

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?

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Old 02-06-2012, 05:03   #2
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Re: KBW Transmisson Whining

Greetings and welcome aboard the CF, defiant1.

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Old 02-06-2012, 06:44   #3
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Re: KBW Transmisson Whining

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.
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Old 02-06-2012, 08:48   #4
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Re: KBW Transmisson Whining

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?
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