[NSRCA-discussion] Engine problem

[Grow Pattern]

John,
          The clue is that it already has a heli-coil in place.

"History: Bought engine at deep discount with damaged threads and had 
Clarence Lee install heli-coil insert."



Once in a while the top of the coil will not seal properly. If you try the theory of using an end-mill it will not handle the steel coil and the ali-head material and will screw up the head completely.



Clarence is very helpful if you have any problems.  If you call him I'll wager he will solve your problem.



Eric.

  ----- Original Message ----- 
  From: Rcmaster199 at aol.com 
  To: nsrca-discussion at lists.nsrca.org 
  Sent: Saturday, August 26, 2006 3:05 PM
  Subject: Re: [NSRCA-discussion] Engine problem


  Are there end mill bits available with a square central locating shoulder built in? Seems that may be the easiet way to get what Earl suggests. Another two step approach might be to use drill rod that just fits the hole as the locator first, locking the head down in the fixture, then switching to the bit and touching the surface to square.

  MattK

  In a message dated 8/26/2006 1:49:06 PM Eastern Standard Time, johnferrell at earthlink.net writes:
    I hate to bug Clarence with the problem. Since the engine runs well the only real problem is it slobbers on the airplane. 

    I have a Lathe and Mill in the shop. Set up will be tricky, the plug is pretty deeply recessed. The risk to the threads by using a pilot rod in the hole is high.

    I believe I will anneal a plug washer and try a little of the liquid gasket goo. If that don't solve the problem I will just accept the mess. 

    John Ferrell    W8CCW
    "My Competition is not my enemy"
    http://dixienc.us/

      ----- Original Message ----- 
      From: Earl Haury 
      To: NSRCA Mailing List 
      Sent: Saturday, August 26, 2006 11:44 AM
      Subject: Re: [NSRCA-discussion] Engine problem


      John

      Assuming that the problem is lack of perpendicularity between the threaded hole and the gasket surface - find a "friend" that will set the thing up in a mill aligned on the threaded hole, then touch the gasket surface with a mill to square. (You might give Clarence a call also - unusual that he would not catch this.)

      Earl


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