OS 140 RX Bearing care

[David Lockhart]

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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