OS Piston Pin

[JOddino]

You folks are sure making a case for gas engines with enough displacement to
get the job done.  My DA50 is barely broken in at 100 flights.  I recently
got an e-mail from a guy who put one in a Gator Giles 202.  It went to 14
pounds but I bet it does exactly what pattern pilots are looking for.  Super
thrust and good braking.  Get rid of the weight limit and you'd see whole
new breed of two meter pattern planes.
My 202 with the OS 1.40 EFI is sitting collecting dust since the bearing
went out at, you got it, 100 flights.  I'd rather fly than rebuild engines.
Jim
----- Original Message ----- 
From: <flyboy422 at juno.com>
To: <discussion at nsrca.org>
Sent: Friday, July 04, 2003 9:09 AM
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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