No
See this Lycoming Service Instruction
http://www.lycoming.com/Portals/0/t...rnator Crankcase Parting Surface Sealants.pdf
There is a lot of debate and plenty of discussion to be found in the archives on this subject.
We have found that Permatex 3H aviation sealer will crystalize after being subjected to heat and time. ALL of it has been removed from my shelf.
Yamabond #4 with silk???????
J
Hi, I just received a FAA service bulletin on RTV sealant it is NOT approved on Continental motors and I would think Lycoming would apply as well. NE-16-13.pdf
https://mail.google.com/mail/u/0/#inbox/15357d1c527182d4
Hope it work`s Russ Emick,Jr
I think we can all agree that this is not an approved method. It's fun to think about trying some other options though. That being said, mine is going together with OO silk thread per Lycoming...
Caleb
RTV-102 is approved for Lycoming per SI 1125D. I used Loctite 518 when I built my engine up the first time and had a few small leaks. After a rebuild a few years later I used RTV-102. It didn't leak after that...
I used Loctite 518 on mine 8 years and ~700 hours ago and it's still dry.
I own a Porsche repair shop and have been using Honda Bond on aluminum and magnesium cases for over 20 years. No issues. Product is similar to Yama Bond. Original Porsche engines were sealed with Permatex which would crystallize and leak.
Are you referring to Permatex #3? I built over 200 VW engines ('73-'75) with it and never had a leak. In the dealer shop I managed, never saw a case leak with it either. But - that is not a very highly loaded engine, but in South Alabama they got plenty hot driving down the interstate WOT. Other gaskets leaked but rarely the cases, and that was due to other factors, not sealant. Also, the engines seemed to be about a 40-50k engine (~1000hr), so they really were not that durable if driven hard.
Everything has its limits, what does the Lycoming engine school recommend now?
...but the skinning issue tends to make them less reliable unles you close the case quickly....
Paul