Question on Bearing change out

[Nat Penton]

Michael, I have about 700 flts on one 91FX and in excess of 500 on another 
with the seals left in place. They are both very smoothe right now, even 
after a few weeks sitting on the shelf. I never run under a 15 in prop 
except for the 14.5 in four blade.                Nat
----- Original Message ----- 
From: "Michael Laggis" <fishgod at pobox.mtaonline.net>
To: <discussion at nsrca.org>
Sent: Monday, February 21, 2005 1:39 PM
Subject: RE: Question on Bearing change out


>I found the shields extremely easy to remove.  They look to be
> rubber/plastic coated brass.  I took an exacto knife and slid it up into 
> the
> outer race and the shield popped right out.  There was no damage to the
> shield or the bearing.  I believe that if I wanted to I could put the
> shields back in.
>
> Michael Laggis
>
>
> -----Original Message-----
> From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org] 
> On
> Behalf Of Tom Simes
> Sent: Monday, February 21, 2005 10:02 AM
> To: discussion at nsrca.org
> Subject: Re: Question on Bearing change out
>
> On Mon, 21 Feb 2005 10:28:19 -0800 (PST) Bob Richards <bob at toprudder.com>
> wrote:
>
>> I had heard that the "shields" were really dust covers, and would not
>> impede the lubrication from getting to the bearings during normal use.
>> IMHO, in the event of a bearing failure, having the shields in place
>> might prevent parts of the bearing from damaging the rest of the
>> engine.
>>
>> Having said that, I have never installed shielded bearings, so I don't
>> have any experience with my theory. Any comments?
>
> I was just going by Boca's documentation which points out that removing 
> the
> shields on the main bearing increases the flow through that bearing to the
> rear of the engine where the connecting rod and piston pins live.  Also by
> example the originals in my engines haven't had shields and further the
> things take relatively little force to remove once you get a good hold on
> them.  I would imagine that in a really catastrophic failure the shields 
> are
> just going to become part of the high speed metal soup anyway.
>
> --
> Tom
>
> _____________________________________________________________________
>
>       |  ,  |               Tom Simes
> ---------(@)---------        AMA 230068
>        --|--                NSRCA 3830
>          '                  nsrca at shinymetalass.com
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