O.S. 1.4 RX bearings

[Bob Pastorello]

Those of us who ran the old OS 61 RF's, pumped or not, remember when bearings lasted forever....UNTIL we started putting high pitch, high diameter props on the beasts.
    Now, we've just added more pitch and diameter over the years, and my experience has been that bearing life relates directly to those factors.  Of course lubrication, and moisture, certainly contribute, but most bearings I've dissassembled have had the balls and races brinnelled and beaten to death.  
    That starts plating flaking, and eats things...it could just be coincidence that they rust, too....

Bob Pastorello, Oklahoma
NSRCA 199, IMAC 1320, AMA 46373
rcaerobob at cox.net
www.rcaerobats.net


  ----- Original Message ----- 
  From: mdarr00 at comcast.net 
  To: discussion at nsrca.org 
  Sent: Friday, July 04, 2003 2:43 PM
  Subject: Re: O.S. 1.4 RX bearings


      Dave, I could not agree with you more!

  Mike Darr
    ----- Original Message ----- 
    From: Dave Smith 
    To: discussion at nsrca.org 
    Sent: Friday, July 04, 2003 3:22 PM
    Subject: Re: O.S. 1.4 RX bearings


    Verne:   Based on my experience with the YS .60 & .61 two strokes,the grease will disappear very soon,even with two seals intact. 
    I don't think lubrication is the problem,or the cure.  The rear bearing is just too small.

    It seems this size bearing started out in life as the bearing for the 1.08.   It makes no sense to me that a bearing for a rather mild 1.08 would stand up to the rigors of a 1.40.

    Good luck,,,,,,,,,,,,,Dave
      ----- Original Message ----- 
      From: Verne Koester 
      To: NSRCA 
      Sent: Friday, July 04, 2003 4:03 PM
      Subject: O.S. 1.4 RX bearings


      Anybody out there try running the O.S. 1.4RX rear bearing with the shields intact? It seems to me that the design doesn't allow enough oil to get to the bearing. Keeping the case cool would help matters but I'm not sure it's the total or only solution to the bearing life problems. Seems like I read where the EFI version uses a stainless bearing with seals. If so, they'd obviously have to be packed with grease like the front bearing and from what I've read on this list, the front bearing never seems to wear out. Granted, it doesn't take the pounding experienced by the rear bearing, but it should be getting very nearly as hot. Maybe the trick is using a sealed bearing packed with grease? I'm going to give it a try and I'll keep ya posted.

      Verne
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