<div>Jim,</div>
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<div>I spoke to Rich at length about this... he said to take the motor apart and to clean the o-rings (make sure they are dry and not oiled when you put them back) and also to replace the gaskets. The simplest is to just replace all o-rings and gaskets.
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<div>I've got the same problem on my one motor - the residue isn't black so I know it isn't exhaust residue - it is clean fuel. There is no leakage - all bolts are tight and the header is tight as well.</div>
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<div>Rich sent me replacement o-rings/gaskets and I intend to do that soon and then run the motor to see if it still leaks.</div>
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<div>-Derek<br><br></div>
<div class="gmail_quote">On Dec 11, 2007 10:49 AM, Woodward, Jim <<a href="mailto:jim.woodward@baesystems.com">jim.woodward@baesystems.com</a>> wrote:<br>
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<p><font face="Arial" size="2"><span style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Hi Guys,</span></font></p>
<p><font face="Arial" size="2"><span style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> </span></font></p>
<p><font face="Arial" size="2"><span style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">What is the final verdict on these O-rings? Will a warm run "melt" the O-ring? Does the viton replacement fit tight enough over the header? Recently my plane is getting really messy, where as before there wasn't a drop of burnt fuel ahead of the exhaust stinger. I replaced the o-ring but still had the mess. I pull the motor last night and checked out everything and the motor looks great, bolts were tight, with no indication of any leakage from the motor or header to motor/flange attachment.
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<p><font face="Arial" size="2"><span style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">I am using the Nishioka spring clamp mount. All things considered and experienced, I think I prefer the stock Hatori mount that comes with the pipe. The Nishioka seems to allow for more fore and aft pipe slippage during running due to the thin vertical white plastic supports (checked while running the plane upside down to try and determine spray pattern and such - in which I didn't find one, which leads me to believe that it starts to happen maybe later in the flight or heat cycle, versus the small amount of running I did as a cursory check.
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<p><font face="Arial" size="2"><span style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Thanks,</span></font></p>
<p><font face="Arial" size="2"><span style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Jim</span></font></p>
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