Question on Bearing change out

[Bob Richards]

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?
 
Bob R.


Tom Simes <nsrca at shinymetalass.com> wrote:
On Sun, 20 Feb 2005 11:42:17 -0900
"Michael Laggis" wrote:

> Thanks Dave, Bob. After I asked the question I went to
> bocabearing.com and they said basically do them like the factory. 
> Thanks for your input. 
> 
> Michael Laggis
> AKA Moose Boy
> NSRCA 3618 
> http://www.alaskarc.org

When I did my first set of bearings, I took a close look at edges of the
shield material and thought it looked too thick to be pierced with an
awl and removed per Boca's instructions. I was pretty worried about
damaging the bearings or races but in the end I sharpened the awl to a
fine point, took a deep breath and it worked like a charm. I didn't try
to measure it afterwards, but I believe the shields may be thicker on
the retaining edge than in the area actually covering the bearings. By
the way, I'm running Boca's stainless rears with both shields removed
and leak stop stainless fronts with both seals intact.

Which reminds me - I need to get an order off for the combat plane and
my ST .75...

At the time I suggested to Boca that a few pictures of the procedure
would definately ease the pucker factor the first time folks do this.


-- 
Tom

_____________________________________________________________________

| , | Tom Simes
---------(@)--------- AMA 230068
--|-- NSRCA 3830
' nsrca at shinymetalass.com
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