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KingCJ6(at)aol.com
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 Posted: Sun Aug 06, 2006 5:27 pm Post subject: Oil leak |
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We have had an increasing, sizable oil leak somewhere forward of the cylinders and were not able to locate the source. While enroute to0the shop, #4 cylinder finally blew the paper gasket and produced an immediate, very sizable oil loss in flight down the right side of the a/c; landed 3 minutes later at the repair facility. Cylinder was resealed and secured, others checked, heat/run-up tested, then all re-torqued. No present oil leaks.
Thinking the cylinder was the original culprit, flew back only to discover that the original oil leak was still present. Observations by the0A&E and other seems to point to blow-by out of the upper nose vase vent. Phone consensus by the talented Sapp/Selby duo is that the case is being internally pressurized by either a bad blower seal or bad ring(s) causing the oil to port out of the vent. We plan to bag the vent to test, but it only seems to occur in flight.
So...any knowledge on the list as to other possible causes, trouble shooting tips, suggested fixes etc.
Thanks, Dave
P.S. - John Z. was flying on my right wing to ferry me back. Were it not for his noticing the visible signs of the failure, probably would have motored for some time, likely loosing the cylinder or more - another significant benefit of form!
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cjpilot710(at)aol.com
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| Posted: Sun Aug 06, 2006 7:14 pm Post subject: Oil leak |
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Try checking the studs that the exhaust collars are safety wired to. These studs go all the way into the rocker galleys and will sometimes leak. Evidence is corking on the exhaust collars.
You can thank Dennis for that one.
Jim "Pappy" Goolsby
| Quote: | We have had an increasing,0sizable oil leak somewhere forward of the cylinders and were not able to locate the source. While enroute to the shop, #4 cylinder finally blew the paper gasket and produced an immediate, very sizable oil loss in flight down the right side of the a/c; landed 3 minutes later at the repair facility. Cylinder was resealed and secured, others checked, heat/run-up tested, then all re-torqued. No present oil leaks.
0
Thinking the cylinder was the original culprit, flew back only to discover that the original oil leak was still present. Observations by the A&E and other seems to point to blow-by out of the upper nose vase vent.0 Phone consensus by the talented Sapp/Selby duo is that the case is being internally pressurized by either a bad blower seal or bad ring(s) causing the oil to port out of the vent. We plan to bag the vent to test, but it only seems to occur in flight.
0
So...any knowledge on the list as to other possible causes, trouble shooting tips, suggested fixes etc.
0
Thanks, Dave0
0
P.S. - John Z. was flying on my right wing to ferry me back. Were0it not for his noticing the visible signs of the failure, probably would have motored for some time, likely loosing the cylinder or more - another significant benefit of form!
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n13472(at)aol.com
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| Posted: Sun Aug 06, 2006 7:48 pm Post subject: Oil leak |
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Also the stud / pin that the rocker cover cable hold down loops over on the rear of the rocker box.
That also goes into the rocker galleys.
Tom Elliott
CJ-6A
NX63727
SANDY VALLEY NV
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