[NSRCA-discussion] Engine problem

[John Ferrell]

Closure for this problem:
It does not appear likely that the glow plug washer cannot seal any misalignment of the threads in the head. The seal is between the plug/washer/head mating. 

I took an appropriately sized mill bit in my fingers and cleaned the head surface lightly. This revealed a rough spot on the mating surface of the head. Being leery of removing material from the head I opted to try burnishing the surface. I did this by dropping a 10-32 steel screw in the recess. The threads are small enough to not engage. I spun the screw with light pressure until the surface was nice and shiny. No lubricant or abrasive was used. 
The leak around the plug seems to be fixed!

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

  ----- Original Message ----- 
  From: John Ferrell 
  To: NSRCA Mailing List 
  Sent: Saturday, August 26, 2006 10:44 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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