Engine case sealing

[skidookid]

Has any one used rtv 102 to seal lycoming engine case and how long ago . Thanks Roger t

[tim2542]

Sounds like nobody has! I know a guy who did his a year ago with no problem, but I'd stick with the tried and true silk thread and permatex.
The problem is two fold, one you need to be quick with the case assembly or the sealant will skin over, and this is is a good time to be slow and carefull. Two, some guys will use too much and you'll have RTV squeezed out and the traveling around the oil sump.
Tim Andres

[A2Jake]

No

See this Lycoming Service Instruction

http://www.lycoming.com/Portals/0/te...20Sealants.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 has changed their formula, I No longer recommend it +++

J

[Norcalrv7]

Interested for you to elaborate on the yamabond. I've used it for years on Honda, Subaru, and other aluminum engine sealing needs. Have you actually tried it? good results?

Caleb

Originally Posted by A2Jake

No

See this Lycoming Service Instruction

http://www.lycoming.com/Portals/0/te...20Sealants.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

[lr172]

I used an anaerobic sealant (Permatex brand) on my case with no thread. 80 hours and no leaks. I guess time will tell, but this is a common approach on sealing the aluminum case halves of Porsche air cooled engines. it's original purpose was pipe flange sealing without gaskets. The nice part is that it has an unlimited open time (cures via absence of oxygen) and the squeeze out inside the engine remains uncured and washes out with the oil.

Larry

[russ-e]

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/#in...357d1c527182d4

Hope it work`s Russ Emick,Jr

[Norcalrv7]

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

Originally Posted by russ-e

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/#in...357d1c527182d4

Hope it work`s Russ Emick,Jr

[Lionclaw]

Originally Posted by Norcalrv7

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...

[hgerhardt]

Originally Posted by Lionclaw

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.

[RV3Bob]

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.