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503 low CHT dilemma

 
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williamtsullivan(at)att.n
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PostPosted: Fri Apr 24, 2009 5:08 am    Post subject: 503 low CHT dilemma Reply with quote

Mike- You mentioned an "O" ring on top of the clip. I just had mine apart, and didn't see that "O" ring. The parts book does show it, but does not indicate where it goes. Does it go in the top #1 slot of the needle? This is part #831-715.

      Bill Sullivan
      Windsor Locks, Ct.
      FS 447
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aslsa.rng(at)gmail.com
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PostPosted: Fri Apr 24, 2009 7:24 am    Post subject: 503 low CHT dilemma Reply with quote

Bill, There is a Service Bulletin (or instruction) that covers the o-ring installation on the jet needle. It's there to inhibit the needle from spinning if the clip is a little loose. I have found needles almost worn in two by this rotation. Of course if that happens the needle will drop into the jet and really ruin your day if you happen to be in the air at that moment, i.e. engine quits. Look on the ROAN site for the bulletin. The gist of it is to inspect the needle and see if it will rotate in the clip. If it does, replace the needle and the clip. The o-ring just sits on top of the clip and is compressed by the spring cup.


Rick

On Fri, Apr 24, 2009 at 8:06 AM, william sullivan <williamtsullivan(at)att.net (williamtsullivan(at)att.net)> wrote:
Quote:
  Mike- You mentioned an "O" ring on top of the clip.  I just had mine apart, andthat "O" ring.  The parts book does show it, but does not indicate where it goes.  Does it go in the top #1 slot of the needle?  This is part #831-715.
 
                                          Bill Sullivan
                                          Windsor Locks, Ct.
                                          FS 447
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ropermike



Joined: 28 Aug 2006
Posts: 40
Location: West Texas, South Mississippi

PostPosted: Fri Apr 24, 2009 9:48 am    Post subject: Re: 503 low CHT dilemma Reply with quote

My jet needle has 4 slots. The o-ring goes in the top slot.

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