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Fri Dec 29, 2006 9:45 pm

Yamabond/Hondabond...absolutely will not leak. goes on like elmer's school glue and sticks like a magnet. yes, it's a pita to remove, but well worth it. i tear my dragbike down every winter and other than head gasket, i cant remember the last gasket i bought. my .02

Mon Jan 08, 2007 8:40 pm

Never use silicone! Use Permatex aviation cement or Curil if the sealing surfaces are warped. Remember Vw used no sealant when they were new. I would use the Curil (used by Porchse) only if the case is questionable as it dries a lot like super glue. Use either spareingly as the excess is squeezed into the oil sump.

Tue Jan 09, 2007 12:36 am

perrib wrote: Remember Vw used no sealant when they were new.

I cannot speak of German production, but my new Mexican VW engines came with a bit of what looks to be Hylomar oozing out of the case seam. Several years with no leaks on those...

Sat Feb 17, 2007 4:12 pm

I have a friend who suggested "Indian Head" (I think that was it) Ever heard of this stuff?

Sat Feb 17, 2007 7:26 pm

Yes - I've never used it for a case though.

Permatex makes a compound called Inian Head.

Mon Feb 19, 2007 3:17 pm

I think it is time to get into the 21st century. Permatex Aviation Form-A-Gasket ruled in the 60s. Then came Gaskacinch. I heard it is no longer available in CA due to VOCs. Then came all the various RTV silicone sealers. I rebuilt a high mileage 1600 single port in a Bus using Permatex High Temp RTV and got 20,000 miles out of it before it started leaking oil. On Porsche 911 aluminum cases and VW Type 4 I have used the Wurth Flachendichtung Orange (same as Loctite 574) with good success until the last one I built last year, the sealer failed! I was so mad I sealed it with RTV and will never use 574 again. I am getting ready to build two 911 engines, one alu case and one mag case and after much research will try the Dirko silicone based sealer from Elring. It apparently is thinner than normal RTVs and takes longer to cure so you don't have that skim-over that the other RTVs have.

I am curious to read if anyone else has had success with Dirko.

Mon Feb 19, 2007 4:14 pm

I have never used anything as good as Curil K2.

Mon Feb 19, 2007 8:16 pm

Curil and Dirko are both manufactured by Elring. Elring also manufactures gaskets, o-rings, seals and complete gasket sets.

Sat Apr 07, 2007 6:36 am

Loctite 574 This the stuff Porsche used for years, but I have not been able to get it from them for months. Stupid expensive, but seals perfectly. One of our suppliers had to call Loctite in Germany to get me more. Loctite 5900 is great too.

Mon Apr 16, 2007 10:17 pm

Gasgacinch with a piece of 00 silk thread around one parting surface, 90 K on my 2180 and not a drop. And BTW, Gasgacinch can be found at almost any Harley performance shop worth it's salt... just my 02.

Tue May 22, 2007 6:19 am

Is it possible to seal the case with say Curil K2 or Permatex aviation sealer, after the motor is together? I did a top-end rebuild only :roll: since all the lower end bearings in the motor were good. Motor runs good but leaks a little oil from time to time. Rear main seal was changed along with all other gaskets including push rod tubes, oil cooler, oil pump, sump plate..etc. So if I put this stuff along the seam of the case will it help to stop the leak? thanks

Tue May 22, 2007 10:08 pm

Glenn wrote: Gaskacinch

25+ years never a leak......And its easy to find it ANYWHERE In So. Cal (so far) big can 'bout $8

Indian Head is more for all steel head gaskets on other makes. There's also a copper spray crap for steel head gaskets. Works good on those, dunno bout vw cases

Sat Aug 18, 2007 9:58 am

I know I'm saying the same thing as most of the guys here.. But... Aviation Permatex!!! Here's the trick though!!! Take a Silk String and run one string down above and one below the bolt holes!! Then, Torque the case within 5 minutes and you'll never leak!!!

It's a trick I learned in Aviation Maintenance School and used it on my race engines and never seen a problem!!!

Sun Sep 02, 2007 10:53 pm

if you can get your hands on the stuff, Catapillar makes a gasket sealer that is orange and comes in a small metal can that is awesome! Coat both halves with the stuff, let it dry and then bolt the halves together. you'll end up prying it apart the next time you rebuild. Holds up to heat better then anything that I've ever come across.

Mon Sep 03, 2007 12:07 am

I finally found a good local US source for Hylomar!

It is stocked by, of all places, Harley-Davidson motorcycle dealers.

Part number 99653 - 85, Hylomar Tube 3.0 oz

Ten bucks a tube at Glendale (CA) Harley-Davidson.

Mon Sep 03, 2007 11:30 am

squirmyman wrote: if you can get your hands on the stuff, Catapillar makes a gasket sealer that is orange and comes in a small metal can that is awesome! Coat both halves with the stuff, let it dry and then bolt the halves together. you'll end up prying it apart the next time you rebuild. Holds up to heat better then anything that I've ever come across.

Sounds like glue!

Wed Sep 12, 2007 1:28 pm

Spoke to an engineer at the airport I fly from and they use WELLSEAL on all their aero engines, and looking at it on the web so do Jaguar and bently. Can be bought from Ebay for about $15 (£8)

Thu Oct 04, 2007 8:23 pm

Indian Head is by far the best!!!!!!! I seal ed everything on my 2332 no leaks....

Sun Oct 21, 2007 5:31 pm

Rokkett33 wrote: Here's the trick though!!! Take a Silk String and run one string down above and one below the bolt holes!! Then, Torque the case within 5 minutes and you'll never leak!!!

It's a trick I learned in Aviation Maintenance School and used it on my race engines and never seen a problem!!!

I had a guy suggest this to me as well. He claimed to be an old porsche mechanic. I haven't personally tried this one yet, but plan to in my next build. 8)

The trick, as I understand, is to locate some real 100% silk thread. This guy said they used to do that with all their 911 engines.

Oh, and I've had good luck with permatex. Gasketsynch didn't work real well on one engine I built several years ago, so I haven't used it since.

Tue Oct 23, 2007 11:29 pm

wardvwracer wrote:
Oh, and I've had good luck with permatex.

Which one? Permatex makes dozens of different sealing substances.