[NSRCA-discussion] Engine problem

[Fred Huber]

If all else fails... step back and punt:

This will take a while...  valve lapping compound thick brass tube.  Thread a long bolt in from the bottom as a guide for the tube.  Apply the lapping compound and spin the tube against the seating surface.  Basicly hand lapping the seat true to the hole.

The end of the tube doesn't even have to be square at the start... the brass is used because its soft enough that it will mill BOTH surfaces flat.  Steel tube would have to have the end milled true first.

Might get some visible concentric rings.. but they will actually help the seal with the plug's brass washer.

  ----- Original Message ----- 
  From: John Ferrell 
  To: NSRCA Mailing List 
  Sent: Saturday, August 26, 2006 9:44 AM
  Subject: [NSRCA-discussion] Engine problem


  General engine problem

  I have a YS91AC that runs fine but leaks fuel around the glow plug.

  It appears that the plug is not square to the head casting so the 

  copper gasket does not completely seal the joint. 

   

  Before I take the problem to my machinist son-in-law are there 

  any suggestions as to how I might resolve the problem?

   

  History:

  Bought engine at deep discount with damaged threads and had 

  Clarence Lee install helicoil insert. The first owner was full scale 

  engine mechanic so I expect the problem was from the factory.

   

  New YS110 is listed at $329, new head-cylinder/sleeve about $150.

  My personal threshold is not to spend more than 1/3 the price of a 

  new replacement in repair parts. 

  Ideas?

   

  John Ferrell    W8CCW
  "My Competition is not my enemy"
  http://DixieNC.US



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