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Also, be sure that you haven't lost a rocker arm retaining clip on the
end of the rocker shaft. I had that happen once, and it had similar
symptoms to those you describe. Bill Glaze<br>
<br>
William C. Harden wrote:
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<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;">Ken,<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;">Do you know
how to check the valve
gap?<span style=""> </span>Your problem could be that one
of the valves is not completely closing. <span style=""> </span>If
this is the case, then it could be either
carbon build up on the underside of the valve, or that the valve gap is
too
small (maybe none at all) and the valve never completely closes. <o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;">Also, I have
seen glow plugs blow apart and
there is hole in the plug itself. <span style=""> </span><o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;">Hope you
solve the problem.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;">Bill<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;"><o:p> </o:p></span></font></p>
<p class="MsoNormal" style="margin-left: 0.5in;"><font face="Tahoma"
size="2"><span style="font-size: 10pt; font-family: Tahoma;">-----Original
Message-----<br>
<b><span style="font-weight: bold;">From:</span></b>
<a class="moz-txt-link-abbreviated" href="mailto:discussion-request@nsrca.org">discussion-request@nsrca.org</a>
[<a class="moz-txt-link-freetext" href="mailto:discussion-request@nsrca.org">mailto:discussion-request@nsrca.org</a>] <b><span
style="font-weight: bold;">On
Behalf Of </span></b>Ken Thompson<br>
<b><span style="font-weight: bold;">Sent:</span></b> Wednesday, June
01, 2005 7:05
PM<br>
<b><span style="font-weight: bold;">To:</span></b>
<a class="moz-txt-link-abbreviated" href="mailto:discussion@nsrca.org">discussion@nsrca.org</a><br>
<b><span style="font-weight: bold;">Subject:</span></b> YS 91AC</span></font></p>
<p class="MsoNormal" style="margin-left: 0.5in;"><font
face="Times New Roman" size="3"><span style="font-size: 12pt;"><o:p> </o:p></span></font></p>
<div>
<p class="MsoNormal" style="margin-left: 0.5in;"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family: Arial;">Hi all,</span></font><o:p></o:p></p>
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<div>
<p class="MsoNormal" style="margin-left: 0.5in;"><font
face="Times New Roman" size="3"><span style="font-size: 12pt;"> <o:p></o:p></span></font></p>
</div>
<div>
<p class="MsoNormal" style="margin-left: 0.5in;"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family: Arial;">I have a
YS-91AC that came in a
plane I aquired last weekend. On the 16th flight I lost the motor
about 2
minutes into my routine. After a safe, and pretty nice landing, I
might
add, I brought it back to the pits to see what happened. I could turn
the
prop by hand with almost no back-pressure. </span></font><o:p></o:p></p>
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<p class="MsoNormal" style="margin-left: 0.5in;"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family: Arial;">I pulled
the motor out when I got
home and checked it out the best I know how. Pulling off the backplate
I
see the connecting rod and piston seem to be OK and the valves seem to
be
moving like they're supposed to. I don't know a lot about these
engines,
as this is the first YS I've run in a plane. </span></font><o:p></o:p></p>
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<p class="MsoNormal" style="margin-left: 0.5in;"><font
face="Times New Roman" size="3"><span style="font-size: 12pt;"> <o:p></o:p></span></font></p>
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<div>
<p class="MsoNormal" style="margin-left: 0.5in;"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family: Arial;">What I
need to know is where is the
best place to send the motor to be checked out and re-built. I don't
want it just patched up, I would like it done right, but a quick turn
around.</span></font><o:p></o:p></p>
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<div>
<p class="MsoNormal" style="margin-left: 0.5in;"><font
face="Times New Roman" size="3"><span style="font-size: 12pt;"> <o:p></o:p></span></font></p>
</div>
<div>
<p class="MsoNormal" style="margin-left: 0.5in;"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family: Arial;">Asking too
much?</span></font><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left: 0.5in;"><font
face="Times New Roman" size="3"><span style="font-size: 12pt;"> <o:p></o:p></span></font></p>
</div>
<div>
<p class="MsoNormal" style="margin-left: 0.5in;"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family: Arial;">Thanks in
advance,</span></font><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left: 0.5in;"><font
face="Times New Roman" size="3"><span style="font-size: 12pt;"> <o:p></o:p></span></font></p>
</div>
<div>
<p class="MsoNormal" style="margin-left: 0.5in;"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family: Arial;">Ken
Thompson</span></font><o:p></o:p></p>
</div>
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<p class="MsoNormal" style="margin-left: 0.5in;"><font
face="Times New Roman" size="3"><span style="font-size: 12pt;"> <o:p></o:p></span></font></p>
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