YS cam bearings

[Verne Koester]

Bob,
If you've never replaced them, it's pretty much guaranteed you'll need to. Should be able to feel the grit from corrosion by rotating them with your little finger. I've gotten them out two ways and both involve heating the case with a torch in the area around the bearing. Likewise for the one encased in the removable housing. I've used a piece of dowel that just fits the i.d.. A little side to side wiggling will get it out. The better way is to fashion a little hook (90 degree bend) in some music wire. Get the hook in behind the bearing and yank it out (after it's heated). 

Verne



---- Original Message ----- 
  From: Bob Kane 
  To: nsrca 
  Sent: Friday, May 09, 2003 11:03 AM
  Subject: YS cam bearings


  Has anyone changed the cam bearings on a YS140FZ? How do you get them out? I may need to replace mine but I will not know for sure until I have a chance to inspect the inside of the motor. My Star was totaled last Sunday when I lost all control during the landing approach. (I suspect the power lead pulled out of the receiver). The nose of the plane was buried 18" in very wet clay, I had to use a shovel to get it out. The hole partially filled with water before I was able to extract the engine, so I'm sure some water got inside. I cleaned it and rinsed it out with fresh fuel, followed with synthetic Klotz oil. The wet ground was a mixed blessing, the only physical damage to the engine was a broken throttle arm, the needle valve and extension wire were unscathed. I have since run the engine and it seems ok, but it ate a new OS F plug on the first run. The plug failure may be a fluke, but I'm afraid there may be corrosion inside the motor fouling the plug. Tha! nks in advance for any help.





  Bob Kane
  getterflash at yahoo.com


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