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Posted by: Puebloswatcop Sep 11 2022, 05:45 PM

So, I have read several posts and watched several videos to do with engine rebuilds. I am wondering what people recommend for the engine case sealant. In Jake Raby's video, he used Aviation gasket sealer, which I have used on other applications with great success.

That being said, this is my first type IV build, so I am seeking input from those who have done their own builds. I would like to know what you used, why and pros and cons.

Thanks for any input......

Posted by: 914Sixer Sep 11 2022, 06:22 PM

Yes, good old fashion Permatex Aviation Gasket Sealer.


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Posted by: Geezer914 Sep 12 2022, 03:56 AM

Curel T-2 for the case and cylinder bases. Loctite 518 for the oil pump. My case is tight as a frogs ass and that's water proof.

Posted by: ClayPerrine Sep 12 2022, 05:44 AM

Drei Bond

Posted by: DennisV Sep 12 2022, 06:18 AM

Like 914Sixer, I used Permatex gasket sealer when I rebuilt our Super 90 engine. It seems to have worked fine, but it has only run on an engine stand.

Conventional wisdom seems to be leaning to Loctite 574. There is a really https://www.klassikats.com/2019/11/08/porsche-crankcase-sealant/ over at Klassik ATS.

Posted by: 930cabman Sep 12 2022, 04:42 PM

quick effective simple. no need to complicate things

Posted by: iankarr Sep 12 2022, 10:00 PM

I used curil K2 on the case and have no leaks. Check out Jake’s video on the sealants he uses on the type 4 Facebook group

Posted by: bbrock Sep 13 2022, 08:14 AM

I used Loctite 574 (or whichever is the orange stuff) on mine when I rebuilt the case in the late 80s. Not knowing what I was doing, I figured whatever Porsche was using would be a good choice. I remember it being spendy, but easy to apply. The engine sat sealed but unfinished for 30 years before first start and now has 6K miles with no leaks.

Posted by: Olympic 914 Sep 13 2022, 09:31 AM

I used Yamabond for the cases, (get at your local Yamaha dealer) Same as Hondabond.

But a local Indy, that was a Porsche tech recommended the Loctite 574

My case does not leak with the Yamabond

Posted by: bbrock Sep 13 2022, 09:39 AM

Looking at the article that @http://www.914world.com/bbs2/index.php?showuser=24575 linked, it seems the test isn't whether they seal the case so it doesn't leak (seems they all do that pretty well), but whether the residue can contaminate the engine and possibly clog an oil galley. Looks like the Loctite and Aviation Sealant are the winners there.

Posted by: Puebloswatcop Sep 14 2022, 03:55 PM

Thanks everyone for your input. Ireally appreciate it. Looks like a toss up between the 574 and Permatex Aviation. I have used the Permatex on other items and found it very user friendly and leak proof. So I guess it depends on availability of the 574.

Posted by: gereed75 Sep 14 2022, 06:30 PM

Double post

Posted by: gereed75 Sep 14 2022, 06:30 PM

There is a comprehensive thread over on Pelican that essentially ends with a definitive sealant kit assembled and sold by Henry Schmit proprietor ot Supertech. It is intended for 911 sixes but should work just fine. Henry knows his stuff

The thread is many pages long. Lots and lots of discussion.

I used the kit to seal my six 5 years ago. No leaks

Posted by: pek771 Sep 15 2022, 03:54 AM

Wurth. Orange stuff, I can't remember its name. Choice #2 is Gasgacinch.

Posted by: rgalla9146 Sep 15 2022, 07:44 AM

I used 574 many times with great results.
Permatex Aviation is the old standby.
'Gasgacinch' which looked and smelled like contact cement was once the 'go to'
My recent 3.2 short stroke has run on a stand but has not been put to work yet.
Dry as a bone so far....like Dennis
I'll know more in early October. Fingers crossed.

Posted by: Justinp71 Sep 15 2022, 10:22 PM

I was thinking the same thing, I think its made by threebond, 1184? That's what is in my toolbox from when I did my six about 9 years ago. The case has given me no issues.

Posted by: bbrock Sep 15 2022, 10:43 PM

https://www.pelicanparts.com/More_Info/SPTCSUPCSK001.htm?pn=SPTC-SUP-CSK-001. A variety of sealants for different uses. Looks like 574 for the case.

Posted by: rgalla9146 Sep 16 2022, 12:29 AM

What ?.......no one is using the FlexSeal family of fine home sealants ?
Now available at Walmart and Target.
Phil Smart