[Public-List] Cutlass bearing clearance, minor Gray Marine vibration normal?

[rbrtschindler at netscape.net]

Hi Micheal,

Thought I might jump in.? If there is no play from side to side but only up and down there may be a problem with the engine alignment.
Over time the weight of the engine can settle to the point where a shim may be necessary.? If the stress on the shaft is great enough
it can actually bend?depending on temperature change(winter haul out)?causing vibration at higher rpm's.?I'd suggest staying in and running
at reduced rpm and tackling this on the off season.? My cutlass bearing has needed replacement for at least a year but still pushed me?
from Hamilton to Kingston(Lake Ontario) and back with no problems.??

Rob?



-----Original Message-----
From: George Dinwiddie <gdinwiddie at alberg30.org>
To: Alberg 30 Public List -- open to all <public-list at lists.alberg30.org>
Sent: Tue, Jul 14, 2009 1:21 am
Subject: Re: [Public-List] Cutlass bearing clearance, minor Gray Marine vibration normal?


Michael,?
?
I was hoping someone more knowledgeable would jump in.?
?
crufone at comcast.net wrote:?
> > What is the acceptable clearance between the shaft and the cutlass?
> bearing at the prop end? I can see that there is rubber all the way?
> around the bearing surface. I have almost no clearance port to?
> starboard and about 1/32" to 3/64" top to bottom. I checked by?
> holding the prop and trying to wiggle the shaft in the bearing.?
?
That doesn't sound too bad to me, but it does indicate wear. How often do you haul? Is there any advantage to waiting? Otherwise, you might want to do it now for peace of mind.?
?
BTW, you don't generally have to pull the shaft to put in a new cutless bearing, but you do need to pull the prop. And don't forget to drill the holes on the sides of the bearing to let the water in.?
?
> I do remember some slight vibration at certain engine rpm's, but it?
> was minor. I assume that the Gray Marine is not a well balanced?
> engine and would vibrate some during normal operation??
?
I would guess that growth on the prop is more likely to cause vibration than the balance of the engine. Alignment is a more important consideration.?
?
?- George?
?
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