[NSRCA-discussion] OS 120 Ax bearing replacement

[John Pavlick]

Got it. You are correct on all accounts. This engine only has about 30 flights on it. The bearaing is OK but a friend of mine had to replace his recently so I figured I do this before it's too late. I normally do this on a brand new motor so the crud on the wristpin surprised me. The sealed bearings are the way to go. They've been running in my OS 160's for a while now.

John Pavlick
http://www.idseng.com
  ----- Original Message ----- 
  From: JonLowe at aol.com 
  To: nsrca-discussion at lists.nsrca.org 
  Sent: Wednesday, May 30, 2007 9:53 PM
  Subject: Re: [NSRCA-discussion] OS 120 Ax bearing replacement


  In a message dated 5/30/2007 8:35:05 PM Central Daylight Time, jpavlick at idseng.com writes:
    Has anyone replaced the bearings in their OS 120 Ax? What's the trick? I've done plenty of bearings but this one is different. After removing everything, including the sleeve, I can't slide the rod far enough back to get it off the crankpin. The pin boss in the piston is too narrow to allow the rod to slide far enough. If anyone has done this already I'd appreciate any insight. Thanks!

  John,
  I've done it.  The rod will slide far enough on the pin, but often sticks on baked on stuff that gets on the pin.  You have to work it back and forth until it frees up.  Try some WD-40 or something like that to try to melt away the crud.

  Use the 1.40  fuel injected rear bearing from Tower.  Cheaper than Boca, and it is much better than the original.  I only got about 30-40 flights on my 1.20 before I had to change the bearing.

  Jon Lowe






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