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  #51  
Old 03-06-2016, 05:00 AM
BigJohn BigJohn is offline
 
Join Date: Nov 2008
Location: Gloversville, NY
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Default 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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  #52  
Old 03-06-2016, 06:04 AM
erich weaver's Avatar
erich weaver erich weaver is offline
 
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Default

Quote:
Originally Posted by F1R View Post
Here is a link to a drilled and pressure lubricated cam system that is STC'd for lycomings. (just in case the roller lifters are not an option for your cases.)

http://thenewfirewallforward.com/tnf...13_new_007.htm
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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  #53  
Old 03-06-2016, 07:02 AM
David-aviator David-aviator is offline
 
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Location: Chesterfield, Missouri
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Quote:
Originally Posted by erich weaver View Post
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
Superior system seems to be working well.
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  #54  
Old 03-06-2016, 07:10 AM
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Kevin Horton Kevin Horton is offline
 
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Quote:
Originally Posted by DanH View Post
Kevin, when you get those tappets out, check the part numbers for 15B26064.
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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  #55  
Old 03-06-2016, 09:41 AM
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DanH DanH is offline
 
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Quote:
Originally Posted by Kevin Horton View Post
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.
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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  #56  
Old 03-06-2016, 11:02 AM
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1001001 1001001 is offline
 
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Quote:
Originally Posted by erich weaver View Post
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
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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  #57  
Old 03-06-2016, 02:51 PM
Bicyclops Bicyclops is offline
 
Join Date: Oct 2012
Location: LA, California
Posts: 323
Default More recent writings of Marvel/Scott

Quote:
Originally Posted by 1001001 View Post
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.
Try this:
http://www.secure4host.net/.../Lycom...ion2013-08.pdf

Google the two names to find more references.

Ed
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  #58  
Old 03-06-2016, 02:53 PM
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1001001 1001001 is offline
 
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Quote:
Originally Posted by Bicyclops View Post
Try this:
http://www.secure4host.net/.../Lycom...ion2013-08.pdf

Google the two names to find more references.

Ed
Thanks. That link shows up as a 404 Not Found.

I'll try googling their names too.
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  #59  
Old 03-06-2016, 03:48 PM
Bicyclops Bicyclops is offline
 
Join Date: Oct 2012
Location: LA, California
Posts: 323
Default 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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  #60  
Old 03-06-2016, 06:39 PM
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Ironflight Ironflight is offline
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Join Date: Jan 2005
Location: Dayton, NV
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Default

Quote:
Originally Posted by Kevin Horton View Post
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.
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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