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03-06-2016, 05:00 AM
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Join Date: Nov 2008
Location: Gloversville, NY
Posts: 1,587
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Thank all contributors ........
.... for posting this saga for all to read. VERY intersting and educational! Sorry it has to be at someone's (considerable) expense.
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John Peck, CFII, A&P, EAA Tech Counselor, Flight Advisor.
?Master Pilot? Award, UFO Member.
RV-12 N37JP 120176 Flying since 2012.
One Week Wonder Build Team, OSH 2018.
VAF paid through 10/2019.
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03-06-2016, 06:04 AM
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Join Date: Aug 2006
Location: santa barbara, CA
Posts: 1,682
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Quote:
Originally Posted by F1R
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Interesting. Especially after skimming through this long winded article
http://occonline.occ.cccd.edu/online...%20Tappets.PDF
It's scary what you find googling lycoming tappet failure
Erich
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03-06-2016, 07:02 AM
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Join Date: Feb 2005
Location: Chesterfield, Missouri
Posts: 4,514
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Quote:
Originally Posted by erich weaver
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Superior system seems to be working well. 
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03-06-2016, 07:10 AM
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Join Date: Jan 2005
Location: Ottawa, Canada
Posts: 2,357
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Quote:
Originally Posted by DanH
Kevin, when you get those tappets out, check the part numbers for 15B26064.
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Dan,
What's the story on the 15B26064 tappets? I see that Lycoming SI-1543 calls for their replacement, which certainly hints at a significant number of in-service issues. Assuming that Aerosport complied with this SI after my first cam/tappet issue, I shouldn't have any of those in my engine.
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03-06-2016, 09:41 AM
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Join Date: Oct 2005
Location: 08A
Posts: 9,500
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Quote:
Originally Posted by Kevin Horton
Dan,
What's the story on the 15B26064 tappets? I see that Lycoming SI-1543 calls for their replacement, which certainly hints at a significant number of in-service issues. Assuming that Aerosport complied with this SI after my first cam/tappet issue, I shouldn't have any of those in my engine.
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I have nothing specific, just the same suspicion you have...that they were found to be a problem. The SI is all we're likely to get from Lycoming. The overhaul shops will no doubt have anecdotal information.
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Dan Horton
RV-8 SS
Barrett IO-390
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03-06-2016, 11:02 AM
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Join Date: Dec 2014
Location: Just Minutes from KBVI!
Posts: 1,039
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Quote:
Originally Posted by erich weaver
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That is a very interesting article. Can anyone point to a follow-up that may have been published? Looks like that article was originally printed in or before 2004. Any further information generated in the subsequent twelve years should be of great interest.
Also, it would be interesting to see if the Service Instruction for external oil lines mentioned would be applicable on more engines than just the Mooney application.
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03-06-2016, 02:51 PM
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Join Date: Oct 2012
Location: LA, California
Posts: 323
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More recent writings of Marvel/Scott
Quote:
Originally Posted by 1001001
That is a very interesting article. Can anyone point to a follow-up that may have been published? Looks like that article was originally printed in or before 2004. Any further information generated in the subsequent twelve years should be of great interest.
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Try this:
http://www.secure4host.net/.../Lycom...ion2013-08.pdf
Google the two names to find more references.
Ed
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03-06-2016, 02:53 PM
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Join Date: Dec 2014
Location: Just Minutes from KBVI!
Posts: 1,039
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Quote:
Originally Posted by Bicyclops
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Thanks. That link shows up as a 404 Not Found.
I'll try googling their names too.
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03-06-2016, 03:48 PM
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Join Date: Oct 2012
Location: LA, California
Posts: 323
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Google should do it
Try googling: Bill Marvel and Bill Scott
It comes up for me the 5th link down. Subject: Lycoming Valve Guide Distress ? Next Steps Folk...
Ed
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03-06-2016, 06:39 PM
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VAF Moderator / Line Boy
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Join Date: Jan 2005
Location: Dayton, NV
Posts: 12,256
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Quote:
Originally Posted by Kevin Horton
I saw some old info from Lycoming when they first started offering roller lifters that said that they could mod cases to add these to engines in the field, but I don't know if that panned out or not.
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The answer is yes...maybe. Some cases can be modified, some can't - depends on how much meat there is in the casting. So definitely worth checking, but beware, the camshaft also has to be changed when you change to rollers.
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RV-8 - N188PD - "Valkyrie"
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