[Public-List] Vibration

[Winslow Ayer]

Thanks Gordon, I’ll check it out when we pull it out. Until then I’ll just go slow and keep the rpm’s down. Most times we don’t need it much.

Winslow

> On Jul 4, 2019, at 8:13 AM, Gordon Laco <mainstay at csolve.net> wrote:
> 
> Good morning - 
> 
> It could be alignment… it could also be cutless bearing wear.   The prop shaft goes through two bearings on it’s way out the stern.   
> 
> One, called ’the gland’ in the old days, is the semi-watertight seal that keeps the water out.  The other, the cutless bearing, holds the shaft in place.  It is the outer one and the one you can see just ahead of the prop when the boat is out of the water.   This bearing is made of hard rubber and is designed to be water lubricated… not a waterproof seal at all.
> 
> It eventually wears.   At lower rpm speeds your may still be doing it’s job… at higher speeds minute eccentricity in either the balance or alignment of your shaft and prop may be taking advantage of the wear and letting the shaft begin ‘chattering’ at those higher speeds.
> 
> 
> Gordon Laco
> 426 Surprise
> www.gordonlaco.com
> 
> 
> 
> 
>> On Jul 4, 2019, at 8:07 AM, Winslow Ayer via Public-List <public-list at lists.alberg30.org> wrote:
>> 
>> Does anyone have thoughts on why I get a vibration above 1200-1300 rpm’s when motoring? I have a feeling that it may be in the alignment of the shaft but I don’t know.
>> It’s not unbearable but it is annoying (and loud).
>> 
>> Thanks for any advice,
>> 
>> Winslow Ayer 
>> Tinkers Damn #283
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