Posted for "Bruce Gray" <Bruce@glasair.org>:

 What you're seeing is piston pin CAP ware. Lycoming has known about this
 issue for almost 10 years and has yet to do anything about it. Both Superior
 and ECI make piston caps that have a better longevity than Lycoming.
 
 
 
 Bruce
 www.glasair.org
  
 
 -----Original Message-----
From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Clark
 Baker
"""
 Last week, at 370hrs SMOH (the second one) I discovered material amounts of
 aluminum material in the filter.  I discovered that I had excessive piston
 pin plug wear.  It turns out Lycoming issued Service Instruction 1492C,
 which addressed problems with excessive piston pin plug wear.  Lycoming
 addressed this by extending the warranty for Lycoming new or Lycoming
 factory rebuilt engines from 1year to 3.
 
 I spoke to my Engine shop manager and they said "it is just one of those
 things" and they don't have a good answer.  I spoke to Lycoming and the
 technician could not offer any advice other than replace the parts and try
 again.
"""