[NSRCA-discussion] 120 AC issues

[Jerry Stebbins]

Stu, when the engine is running, and well warmed up, run it up and get it at a higher RPM, and watch for any sign of bubbles in the fuel lines.That is an indication of the extra heat Ron mentioned from a bad bearing/tight bearing/shaft. Some AC's really suffered from that problem. Also had a slightly bent shaft cause heat in the front end. Might also check valve cover gasket/seal ( sand the cover flat) since that could give similar symptoms after everything gets warmed up. I assume you have already checked the box cover and gaskets.
Jerry
  ----- Original Message ----- 
  From: Stuart Chale 
  To: General pattern discussion 
  Sent: Sunday, July 13, 2008 9:53 AM
  Subject: Re: [NSRCA-discussion] 120 AC issues


  Sure I just get upstairs after pulling the motor apart again and swapping out the cylinder liner for one from another motor.  Looked almost new no burn marks but my son is getting frustrated with little flying time each time at the field so I changed it just in case.  Put both motors back together reinstalled the motor in the plane.  Found a new muffler in the box, put that on.  Only to find that I should have changed the front bearing as well :)
  Can you be a little quicker next time Ron?  :)
  If this doesn't work next time the bearing and anything else suggested.  Bearings feel fine though.  Engine was really almost new.  Not even much carbon or varnish at the valves.
  Thanks,
  Stu

  ronclark51 at comcast.net wrote: 
    Stuart,
    I've had the same problem before. It was the front bearing. The bearing heats up the front of the motor, then the regulator, vaporizing the fuel. Better known as vapor lock.

    Ron.....................

      -------------- Original message -------------- 
      From: Stuart Chale <schale at optonline.net> 
      I wouldn't have thought about the pipe.  I should have another.
      Thanks,
      Stuart

      RUDDERCABL at aol.com wrote: 
        In a message dated 7/12/2008 11:33:24 PM Eastern Daylight Time, schale at optonline.net writes:
          I'll have to pull it a part again and see if I see anything with the sleeve.
          Anyone else have any thoughts?
          Thanks,
          Stu

        Sure do.

        Try a different pipe. I know a flyer who had this same problem some years ago, not with an AC though. He tried everything and the problem kept hounding him. Turned out that the pipe was plugging up when it heated up and restricting the exhuast flow. 

        Robert





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          Subject: Re: [NSRCA-discussion] 120 AC issues 
          From: Stuart Chale <schale at optonline.net> 
          Date: Sun, 13 Jul 2008 12:51:04 +0000 
          To: General pattern discussion <nsrca-discussion at lists.nsrca.org> 
          To: General pattern discussion <nsrca-discussion at lists.nsrca.org> 


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