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......

Yes, good old fashion Permatex Aviation Gasket Sealer.

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.

Drei Bond

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 great read on Porsche Crankcase Sealant over at Klassik ATS.

quick effective simple. no need to complicate things

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

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.

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

Looking at the article that @DennisV 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.

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.

Double post

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

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

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.

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.

Here's the kit. A variety of sealants for different uses. Looks like 574 for the case.

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