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Sat May 21, 2022 10:50 am

Has anyone tried Yamabond 4 Semi-drying Liquid Gasket to seal the case halves? I have had great success using it on motorcycle engines with a vertical case split, but have not tried it on an air-cooled VW engine yet.

I recently re-built a 1600 DP engine using Elring Curil K2 on the case split. I have read that this sealant was used in the factory. Much to my disappointment, I get a drop or two of oil forming on the case split line at the front casting boss directly under the flywheel. Ruled out the main bearing seal and cam plug because there is no leakage when the engine is running. The leakage only appears when the engine has sat cold iron for a few days.

I am interested in hearing about the experience of others dealing with case leaks along the split line, Thanks!

Sat May 21, 2022 11:56 am

I have used Gasgacinch for decades.

Here is a whole thread on the subject!
https://www.thesamba.com/vw/forum/viewtopic.php?t=...mp;start=0

Sat May 21, 2022 3:19 pm

Loctite 574 is made for Porsche/VW case splits. I think autohauseaz.com still sells it.

Mon May 23, 2022 4:44 am

Starbucket wrote: Loctite 574 is made for Porsche/VW case splits. I think autohauseaz.com still sells it. That's what I've used in recent years. No drips or seepage so far.

Mon May 23, 2022 10:32 am

Starbucket wrote: Loctite 574 is made for Porsche/VW case splits. I think autohauseaz.com still sells it.
I can get the Permatex version from my local autoparts: https://www.permatex.com/products/gasketing/anaero...ker-50-ml/

Mon May 23, 2022 10:52 am

https://www.amazon.com/Permatex-80019-Aviation-Gas...&psc=1

Permatex Aviation

Mon May 23, 2022 9:51 pm

+1 for Loctite. However take note of its setting time specifications. There's a belief that it "only dries when deprived of air" this is not correct and modern formulations react differently to different metals, the setting time curves show this.

Best thing about Loctite is that using there own removal spray, it just wipes off after 15 minutes.

Fri Jun 03, 2022 7:45 am

Had the same small oil leaks after using Curil K2 sealant on my recent 36hp rebuild. In the process of a 912 engine rebuild and would like to know what works. Looks like Loctite 574 may be the right stuff.

Fri Jun 03, 2022 10:25 am

rzepko6194 wrote: Had the same small oil leaks after using Curil K2 sealant on my recent 36hp rebuild. In the process of a 912 engine rebuild and would like to know what works. I had the same issue after trying the curil on a rebuild. So far nearly two years later the Loctite is working fantastic. As said above, make sure to read the instructions. Seeing as you're building a 912 engine I'm sure I don't have to tell you that haha

Sun Oct 30, 2022 1:46 pm

as a side note to this thread. I have used 574 and when split it is weird, like old paper falls apart. That said, VW and Porsche used it a long time. Some swear by it and some swear at it. On the Permatex site today I came across their top ten do not ever do list. Using an anaerobic sealer any place where it could be exposed to fuels is a big no-no. What's up with that if 574 is used on the crankcase?

Quote: 4. Using an RTV or anaerobic gasket maker on an application that is exposed to gasoline.

Only solvent-based gasket makers have the ability to stand up to repeated direct contact to gasoline. Powersports vehicles, antique cars, gas-powered tools, and equipment all tend to have their gaskets exposed to gasoline. Gas weakens RTV and anaerobic flange sealants. If your assembly will have direct exposure to gasoline, you should use a solvent-based gasket maker.

https://www.permatex.com/the-ten-most-common-gasketing-mistakes/

Sun Oct 30, 2022 3:11 pm

VW_Jimbo wrote: I have used Gasgacinch for decades.
Here is a whole thread on the subject!
https://www.thesamba.com/vw/forum/viewtopic.php?t=...mp;start=0
I've always been a Gasgacinch guy too. The only time I ever had a case leak was when I used Curil, once.

Sun Oct 30, 2022 3:58 pm

I used Gasgacinch on T1 motors in the 70's and 80's. Was a different formula than now. I bought some on my first T4 I was going to build in 2009 but it was too thin, and went off in the can quickly after being opened. Leaves a lot of white stuff in the bottom of the can too. Here in CA most of the formulas have changed due to environmental laws.

Sun Oct 30, 2022 4:20 pm

Permatex Aviation, dozens of engines, never a problem.

Sun Oct 30, 2022 5:13 pm

I've used both Curil K2 and loctite 518. Both lasted for more than a decade with no leaks, not even sweating. The K2 doesn't like deep scratches or gaps in the mating surfaces, so maybe that's why some people were having trouble with it.

Sun Oct 30, 2022 7:56 pm

SGKent wrote: I used Gasgacinch on T1 motors in the 70's and 80's. Was a different formula than now. I bought some on my first T4 I was going to build in 2009 but it was too thin, and went off in the can quickly after being opened. Leaves a lot of white stuff in the bottom of the can too. Here in CA most of the formulas have changed due to environmental laws.
Aww damn Steve, are you cereal? I don't wanna believe this. I may have to be the California guinea pig and try this newer formula on my next build, which is right around the corner. I may have to reseal it if things go awry down the road.

Mon Oct 31, 2022 12:06 am

574 was discontinued a long time ago and superseded with 518

It's BACK? When did it come back?

hmmm

IMO safest choice is the brown goop Permatex 300 (or permatex Aviation)
Make sure the surfaces are clean dead flat and free of any burrs or dings.

Mon Oct 31, 2022 1:06 am

574 Never went away. There are many different loctite rigid metal flange sealants out there. 518 is a high viscosity liquid(gel) so it needs to be evenly spread to avoid a gap between surfaces and sets a more softer seal . 510 is similar to 574 but for higher temperatures but less resistant to engine oil.

Note.: 574 is the only one specifically designed to resist against oil contamination or degradation over longer periods if time.

Mon Oct 31, 2022 2:49 am

+1

I use 574 on my triumph britbike head gaskets.but lately using 510 more.

Interesting how 518 gets stronger with oil but only at medium temperatures, but at high temperatures it strength almost disappears,

Interesting that 518 has no fuel resistance, while 510 does not state if good or bad for fuel...

Mon Oct 31, 2022 3:36 am

They all work, in place of Curil K2 you can use the Curil T, excellent sealer. Gasgacinch is thinner and doesn't have that aroma that would tickle the nose as it did in the past, what a shame, but it still works. 518 is the bomb, wonderfull stuff, used many a tube for the case halves then Curil T for the cylinders to case spigots, never a leak. Last but least is Permatex Avation been around longer than any of have been and still works.

It all comes down to personal choice and how much you want to sepnd and where you have to obtain the goo.

Just don't use RTV / Silicone

Mon Oct 31, 2022 3:57 am

BMFBMF wrote: +1

I use 574 on my triumph britbike head gaskets.but lately using 510 more.

Interesting how 518 gets stronger with oil but only at medium temperatures, but at high temperatures it strength almost disappears,

Interesting that 518 has no fuel resistance, while 510 does not state if good or bad for fuel...

That is why the 574 is best suited to air-cooled crankcases. Oil and heat means 574