OS 140 RX Bearing care

[Earl Vincent]

When I was running my EFI I tried to leave both shields (rubber) in and on a
95 degree day the engine started
sagging on uplines and then would stall at idle, I took the bearing out and
found the rear shield was rubbing the face of the
crankshaft, after removing the shield the problem went away, I also use
mobil 1 for after run or Cool Power synth oil. Have
always taken the shields out since, and have never had the problem again. I
have tried leaving the fuel in the engine like Bryan
suggested, the plain steel bearing went bad in ten flights at our last
contest, maybe this stainless bearing will last longer.Other than the
bearing, I am very happy with the engine running the Greve pipe, but the
HOT+HUMID=more nitro in my YS days
are still ahead, when it is this hot do you shorten the pipe or lengthen to
keep it coming on in the same spot on the two stroke?
Earl
----- Original Message ----- 
From: "David Lockhart" <DaveL322 at comcast.net>
To: <discussion at nsrca.org>
Sent: Thursday, May 15, 2003 11:01 PM
Subject: Re: OS 140 RX Bearing care


> Agree.  The bearing is the key - I've run the stainless steel bearing
> with shields in 2 different engines since the NATs last year and both
> have over 200 flights and are still smooth.
>
> I do like to do something for after run - burn out all the fuel and
> then use either Amsoil MP or Mobil Synthetic 5-30 for after run.  This
> process didn't seem to help the non-stainless bearings - but the rest
> of the engine stays very clean.
>
> Dave Lockhart
>
>
> ----- Original Message -----
> From: bryan <patriot at eatel.net>
> Date: Wednesday, May 14, 2003 7:37 pm
> Subject: Re: OS 140 RX Bearing care
>
> > Earl I have been running the EFI 1.40 O.S. for almost 1600 flights
> > going on three years
> > I can predict Failer of every part on the motor within about 25
> > flights,I never use after run oil, I leave the fuel in the tank
> > ,don`t run the motor out ,,,I don`t do a thing but put it in the
> > car
> > I fly about 700 flights a season and go through 2 rear bearings,
> > never change the front bearing, save once, I Use Coolpower 25%
> > with a 17-3/4+12 APC prop
> > the Stainless might  last about 150 flights
> > you have to leave the sheilds in the bearing, if they come with
> > them
> > Boca Will not last they will rust no mater what you do
> > the first few runs  with the sheilded bearings are about 200r`s
> > down but after that
> > no problems
> > I think Dave started using these bearing last year and he is
> > having the same run times
> > you can get these Bearings from Hobbico, Radio South, get hold Of
> > Mike Stokes or Tony Stillman if you run into problems finding them.
> > Bryan
> > WWW.EXECUTIVEAIRFRAMES.COM
> >  ----- Original Message ----- 
> >  From: Earl Vincent
> >  To: nsrca
> >  Sent: Thursday, May 15, 2003 12:43 AM
> >  Subject: OS 140 RX Bearing care
> >
> >
> >  FYI
> >  Anyone running OS 140 RX, I have hooked up, thanks to a spare
> > part from Eric Henderson, an FI pressure tap in the top
> >  left bolt hole of the rear cover looking at the back of the
> > motor, am running a fuel line to a fuel dot which allows injection
> > of after run
> >  directly into crankcase using a Sig glue seringe, have to open
> > the throttle barrel or move piston to bottom of travel to allow oil
> >  to enter case. OS part # 29407300, after 35+ flights using
> > stainless bearing, I disassembled and bearing is as clean as the day
> >  I put it in, I will let you know if this helps the bearing issue
> > with this engine. I feel by not having to turn engine through
> > compression  to distribute, the oil stays in the bearing area and
> > not in the cylinder or pipe.
> >  Earl Vincent
> >
>
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