OS Piston Pin

[flyboy422 at juno.com]

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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