The place you later find oil often has only a slight correlation with where the oil is coming from. Two common areas are from the vacuum pump seal (if you have a pump) and from crankcase through-bolts and cylinder hold-down bolts. At the front of the engine, high pressure oil is directed to the main bearing. The only seal preventing this oil from exiting the crankcase halves is the silk thread and whatever sealant the builder has used. A thread is supposed to be wrapped around the area where the front through-bolts pass, but it is sometimes breached by the hot high temperature oil.
I agree with the methods described by others to find oil. In my case, just a thorough solvent cleaning and compressed-air drying, followed by 1/2 hour of flight, uncowling, and a bright light showed the bolt threads and nuts to be wet with oil. I then made my repair and repeated the procedure because I didn't want to loosen any more bolts than I had to and the sealing took a lot of labor. It took several rounds of this procedure before we were done. If through-bolt leaks are your problem, I'll be glad to relate how I stopped the leaks. David N6359V --------------------------------- to unsubscribe send mailto:[EMAIL PROTECTED] _________________________________________________________ Enlighten your in-box. http://www.topica.com/t/15
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