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<DIV><FONT size=2>If all else fails... step back and punt:</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>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.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>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.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Might get some visible concentric rings.. but they will
actually help the seal with the plug's brass washer.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=johnferrell@earthlink.net
href="mailto:johnferrell@earthlink.net">John Ferrell</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">NSRCA Mailing List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Saturday, August 26, 2006 9:44
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [NSRCA-discussion] Engine
problem</DIV>
<DIV><BR></DIV>
<DIV>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT
face=Arial><STRONG>General engine problem</STRONG></FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=Arial>I have a
YS91AC that runs fine but leaks fuel around the glow plug.</FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=Arial>It appears
that the plug is not square to the head casting so the </FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=Arial>copper gasket
does not completely seal the joint. </FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT
face=Arial> <o:p></o:p></FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=Arial>Before I take
the problem to my machinist son-in-law are there </FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=Arial>any
suggestions as to how I might resolve the problem?</FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT
face=Arial> <o:p></o:p></FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT
face=Arial><STRONG>History:</STRONG></FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=Arial>Bought engine
at deep discount with damaged threads and had </FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=Arial>Clarence Lee
install helicoil insert. The first owner was full scale </FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=Arial>engine
mechanic so I expect the problem was from the factory.</FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT
face=Arial> <o:p></o:p></FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=Arial>New YS110 is
listed at $329, new head-cylinder/sleeve about $150.</FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=Arial>My personal
threshold is not to spend more than 1/3 the price of a </FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=Arial>new
replacement in repair parts. </FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT
face=Arial>Ideas?</FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT
face=Arial> <o:p></o:p></FONT></P></DIV>
<DIV><FONT face=Arial>John Ferrell W8CCW<BR>"My Competition
is not my enemy"<BR><A
href="http://DixieNC.US">http://DixieNC.US</A><BR></FONT></DIV>
<P>
<HR>
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