OS 140 Bearings

[Rodney Tanner]

Steve,
Where do you get your replacement bearings?
How often do you change rings and pistons?
Rodney
NSCRA 2906





--- flyboy422 at juno.com wrote:
> Verne,
> 
>      If you can stand one more take on the OS piston
> I'll share my
> experience.  I have been flying OS 140's for 3 years
> which means I have
> been changing bearings at least twice a year. 
> Everything that has been
> written on the list regarding the wrist pin is
> correct.  The method I use
> for the bearing is as follows:  Perheat your oven to
> 500 degrees.  Clean
> as much fuel off the case as you can.  Put the case
> in the oven for 30
> minutes.  When you open the oven door, the bearing
> will be out of the
> case.  If  you are not this lucky, it will only take
> a slight rap to
> finish the job.  Put the new bearing(stainless) in
> the freezer for the
> same 30 minutes.  I remove any shields from the
> bearing.  They only will
> restrict lubrication.  Put the bearing onto the
> crankshaft and insert
> into the case.  I know you'll know what to do next.
> 
>        I suggest you use only stainless bearings and
> expect to get about
> 100 runs out of it.  The early warning sign of wear
> will be a slight
> rocking of the prop when the engine is hot.    Once
> that starts you have
> about 10 flights left.  I use after run oil
> religiously.  Good luck and
> I'll see you at the Nats.
> 
> Steve Miller
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