OS Piston Pin

[Verne Koester]

Thanks Steve.

Verne


----- Original Message ----- 
From: <flyboy422 at juno.com>
To: <discussion at nsrca.org>
Sent: Friday, July 04, 2003 12:09 PM
Subject: Re: OS Piston Pin


> 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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