Gaskets - what sealant to use?
 

My chain housings are a little rough where they mate with the block. I'm afraid if I install them dry I'm going to end up with a leak. What sealant would be used for this situation?

I don't know why you couldn't use the Loctite fay surface sealant used for the case halves. Wayne recommends using it if you have to remove the gasket if you have had extensive head work done etc a thin coat on each side of the gasket should work. Another option, and the one I used on a recent build is Permatex Hi tack sprayable sealant. Just spray on each side of the gasket. It really depends how pitted or rough your surfaces are.

I like Hylomar a lot. It seals really well but disassembles easily. F1 teams seem to like it too.
regards,
Phil

I would stay away from the Loctite 574 (cheese whiz) for gaskets. It is for sealing rigid gaps not for paper gaskets. Once it dries it's a pain to clean off also.

If you are worried about leaks (and everyone should be), see if you can clean up the chainbox surface i.e. make it clean and flat.

Also, I've noticed that the chain box to case gaskets come in different thicknesses, probably depending on who made them. I try to get the thickest ones. From my poor memory, I think the "thin" ones were something like .6mm thick and the "thick" ones were something like 1.2mm thick.

-Chris

P.S. If you really feel the need to use sealant, Curil T is non-hardening, easy to clean off and won't create "crumbs" to plug up your oil passages.

HI Lee I would use Curil-K2 or with the green Locktite 573,IF you use the 573 DO NOT touch it with your fingers, use rubber gloves or a brush to spread, the Curil-K2 is the original factory sealer you find round the cases of a engine that has not been apart, the 573 was brought in it 76-77 with the 3.0 Carrera to cure oil leaks, if you have the gray graphite gaskets(these are soft/flexible gasket OE, not like the one in the late after market sets) do not put any sealer on them as it will not seal.

regards mike

What's the difference between Curil K2 and Curil T?

After the time I've spent cleaning up everything I want to make sure that whatever I use won't leave a mess if this engine ever has to come apart again. However, the more I see of the mating surfaces the more I'm sure I need to use some sort of sealer... as did the person who last put this engine together.

I would propose Loctite 5900.
This is the new generation liquid seal which now the automobile industry used for attaching oil pans to block.
No seal needed.

There is nothing better on the market yet.
All other Porsche liquid seals are developed in the 70th & 80th. Henkel (Loctite) made a lot of improvements since then.

Greetings

Doesn't Porsche now recommend a silicone based case sealer? May be the 5900.

I do have also the old Loctite products and my case never was 100 % dry. That´s what the automobil industry uses fro sealing oil pan to block.

For the difference between Curil K2 and Curil T...
try this

http://www.ekag1.de/pdf/dm/Dichtmassen_EN_4.pdf