Question on Bearing change out

[Wayne Galligan]

I use the Purvis bearings and leave the rubber seals in them and have had
good service with that setup.  OS 1.40  has over 130 flights and still
running strong.

Wayne G.

----- Original Message ----- 
From: "Tom Simes" <nsrca at shinymetalass.com>
To: <discussion at nsrca.org>
Sent: Monday, February 21, 2005 1:01 PM
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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