OS-140 bearing question

[Bob Kane]

Wiggling the prop is my standard bearing health check.
If you can detect any play (fore and aft) in the prop
tips of a cold motor, it is time to order a new
bearing. I can usually detect play in the bearing
before any symptoms show up in performance. Most
pilots are skeptical of the test because "it still
runs ok". By the time the performance starts to
suffer, the bearing is pretty well shot, and you are
risking damage to the conrod, the crank is now moving
in a conical path instead of pure rotation. If you let
it go further, the bearing can throw a rivet
(depending on construction of the race) or spin in the
case, at which point you have much more expensive
problems.

--- Wayne Galligan <wgalligan at goodsonacura.com> wrote:
> I will have to agree with Chris.  All the bearings
> in both pf my OS 1.40 RX
> gave the same warning.  Loads up in midranges and
> will quit running or stall
> out on throttle up, or the idle starts getting bad. 
> They never really felt
> rough but I did notice if  wiggle the prop from the
> tips you can feel the
> looseness or end play from the bearings being worn. 
> When replacing the
> bearing leave the seals in the bearings.  They will
> last 2-3x longer.
> 
> Wayne Galligan
> 
> ----- Original Message ----- 
> From: "chris moon" <cjm767driver at hotmail.com>
> To: <discussion at nsrca.org>
> Sent: Tuesday, March 15, 2005 10:45 PM
> Subject: RE: OS-140 bearing question
> 
> 
> > Jason:
> >   What I noticed most is that it will start to
> load up in the midrange for
> > no reason. Mine did not feel rough or have any
> play, it just got really
> bad
> > in the midrange.  I took it apart and the bearing
> looked terrible.
> Replaced
> > it, and it went back to running great.  By the
> way, the best bearing is
> the
> > OS bearing for the EFI version of the 140.  Tower
> has them for maybe $25
> and
> > it is a sealed bearing.  I have 200+ flights on
> one now, and it shows no
> > signs yet of going bad.
> >
> > Chris
> >
> >
> > >From: "Jason" <jasonshulman at cox.net>
> > >Reply-To: discussion at nsrca.org
> > >To: "NSRCA" <discussion at nsrca.org>
> > >Subject: OS-140 bearing question
> > >Date: Tue, 15 Mar 2005 21:01:45 -0700
> > >
> > >Hi guys,
> > >
> > >My friend (not on the list) is curious what
> happens when the bearings
> start
> > >to go? Does it make noises? Feel rough (his is a
> little, but not bad)?
> > >
> > >Also, what is the Boca part # for a bearing set
> for the OS-140?
> > >
> > >Thanks,
> > >Jason
> > >www.jasonshulman.com
> > >
> > >
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> 
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> 

Bob Kane
getterflash at yahoo.com


		
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