The Complete Engine Sealant Thread...

[speedo]

A couple local builders like Permatex high tack especially for mag cases. Claim it stays more flexible than hardened 574, but was very messy. What kind of window of time does it provide before starting to harden, and just one or both case halves?

[x98boardwell]

It seems that much has changed from the 911 engine rebuilding book that was done by wayne at Walt's place (Competition Engineering) in Lake Isabella.

In that book it recommends loctite 574 for most but Henry Schmitts shows different solvents (which I purchased and have) and I'm trying to see what to do in the morning....

I have 574 and then I have the others options for all surfaces.. some which include 574 and others.

Does anyone have the most updated list or has it not changed?

Thank you,
Bryan

[gtc]

I'd suggest you start with this post, and scan forward through this thread.
FWIW, I have about 5 years on my motor now with these sealants, and the only leaks have been from the chain tensioner lines that I reused.

Originally Posted by CBRacerX

NEW LIST (I've lost the ability to Edit Post #1 since it is from 2008...)

Outer Case Halves: Threebond 1104 (now 1184)

Bearing Saddle Surfaces: Loctite 574

#8 Bearing (balancer end) O-Ring: Threebond 1211 (now 1215)

Case Thru Bolts: Dow Corning 111 on Green Viton O-Rings

Flywheel Seal: DRY

Balancer Seal: DRY

Intermediate Shaft Cover to Case: ThreeBond 1211 (now 1215)

Oil Breather Cover to Case: ThreeBond 1211 (now 1215)

Cylinders to Case: Curil K-2 or ThreeBond 1211 (now 1215)

Cam Towers to Cylinder Heads: Threebond 1104 (now 1184)

Cam Chain Housings to Case: Threebond 1104 (now 1184)

Cam Chain Housings to Cam Towers: Threebond 1104 (now 1184)

Cam Chain Housing Cover to Cam Chain Housing: Threebond 1104 (now 1184)

Gaskets: Thin coat of Loctite 574

Thanks a lot folks, I really appreciate the feedback!

EDIT: Most Popular solutions for sealing added to each item above to include superseded items.

[tea boy]

I have not seen it mentioned in the thread.
What, if anything, do we put on the metal gaskets with rubber bonded to the them, chain housings to case on 964 and 993 engines?
Thanks.

[speedo]

Originally Posted by gsxrken

Thanks Henry. I hope we’re saying the same thing or I’m explaining it properly. A picture may be worth a thousand words here - I applied it to the o-ring, not the bearing.

Did Henry respond to this?

[gsxrken]

Originally Posted by speedo

Did Henry respond to this?

Via phone call, yes. In a nutshell, The glueing of the case halves at the #8 and of the #8 perimeter itself is an optional insurance policy type of thing. I lubed the o-ring with the 1211 versus the bearing perimeter, so in my case I didn’t really glue the bearing, but he said I’ll be fine. I should know in a week or so when I install my engine.
I don’t want to misquote him here so I won’t elaborate. Perhaps he’ll chime in.

[mikedsilva]

Anyone else having doubts about 1104?

I'm thinking about switching back to using 574 for case halves and cam towers to heads.

The 1104 just seems to go off so quickly. I applied it to both case halves, but by the time I got to putting them together, (maybe 5 minutes) they were 'dry to touch'.. When clamped together, there was only a little squeeze out at certain areas, likely from where it was a little thicker. The sealant that did squeeze out, was soft and pliable for some time.. which leads me to think that my join 'should' be ok and leak free. But I will only find out after it's together and running..

Or should I just tear down the short block, clean it up, and use 574?

574 seems so user friendly in comparison...

[Jeff Alton]

1104 on the case halves (or its current iteration), your choice on the cam towers. We have had good success with both 1104 and 574 there. But never ever had a case leak with 1104 on the case.

To the previous poster that thinks Wayne's recommendations are gospel... Build a few engines, find what works for you. You MAY find some things in that book that you would never do.... As an example, we, like many pros in the industry, would never put RTV on a case bolt washer. Its a great book, we reference it often, but build a few motors and learn what it is right and what is.....

Read the thread. There is so many great recommendations. Pick your sealants, and go with it. There is not one solution, but pros (who have actually built many motors) have taken the time to give you their experiences.

[tea boy]

Originally Posted by tea boy

I have not seen it mentioned in the thread.
What, if anything, do we put on the metal gaskets with rubber bonded to the them, chain housings to case on 964 and 993 engines?
Thanks.

Does anyone know about this?
Thanks.

[safe]

Originally Posted by tea boy

Does anyone know about this?
Thanks.

Nothing works fine!

[tea boy]

Originally Posted by safe

Nothing works fine!

Brilliant, thanks.

[motogman]

Is ThreeBond 1104 aka 1184?

[gtc]

Originally Posted by motogman

Is ThreeBond 1104 aka 1184?

Yes, 1104 was replaced by 1184.

[gled49]

I was Rothsport’s engine and trans guy for 5 years, with another 40+ on each side. I’ll keep it simple, case 1/2’s and cam housings to heads: 574. Gaskets dry and Orings DC111. G

[lvporschepilot]

Originally Posted by gled49

I was Rothsport’s engine and trans guy for 5 years, with another 40+ on each side. I’ll keep it simple, case 1/2’s and cam housings to heads: 574. Gaskets dry and Orings DC111. G

thanks for posting!

I love 574, I think it's great stuff. That said, I really like 515 as well, it's the same consistency as 574 only it's purple, smells like grape jelly for some reason (not kidding) and has a higher tensile strength, and is more readily available not to mention cheaper.

[Privateer383]

Having looked through the entire 34 pages of this thread, I am still a little unsure of what sealant, if any, is used on the "Crankshaft seal -front/pulley end", part no. 999 113 290 41 in the PET. Did I overlook it, or was it referred to by a different name? Some guidance, please.

[OSC911]

As stated above - dry. They have called it a balancer seal. In saying that, I’ve been a mechanic for 30 years and I always use a very thin smear of Toyota Seal Packing on both the rear main and front seals. It is a fantastic product. Probably like the Threebond/Yamabond but black.

[Privateer383]

Much appreciated OSC911!

[Focker]

Can anyone comment on the Yamabond or Hondabond equivalent to Threebond 1104/1184/1194?

Threebond is difficult to find here in Canada. Both Yamabond and Hondabond are readily available and used to seal case halves for motorcycle engine rebuilds.

[Henry Schmidt]

Originally Posted by Focker

Can anyone comment on the Yamabond or Hondabond equivalent to Threebond 1104/1184/1194?

Threebond is difficult to find here in Canada. Both Yamabond and Hondabond are readily available and used to seal case halves for motorcycle engine rebuilds.

YamaBond and HondaBond are both made by ThreeBond. Check their data sheets for specifications.

Outer Case Halves: Threebond 1184 (apply to only one half)

Bearing Saddle Surfaces: Loctite 574 (only if you're confident of a quick assembly)

#8 Bearing (balancer end) O-Ring: Threebond 1211 in case saddle

Case Thru Bolts: Dow Corning 55 on Green Viton O-Rings

Flywheel Seal: DRY

Front pulley Seal: DRY

Intermediate Shaft Cover to Case: Thin coat 574 on gasket, Dow 55 on o-ring

Oil Breather Cover to Case: thin coat of 574

Cylinders to Case: Curil K-2

Cam Towers to Cylinder Heads: Threebond 1184

Cam Chain Housings to Case: thin coat 574

Cam Chain Housings to Cam Towers: Dow 55 on o-ring and thin coat 574 on gasket

Cam Chain Housing Cover to Cam Chain Housing: thin coat 574

Gaskets: Thin coat of Loctite 574

Galley plugs and chain box pins: Loctite 9340 Hysol epoxy

We've been building engines using this technique for over twenty years.
That's nearly 200 911 air-cooled engines with stellar success.
Have others been successful with varying technique? Of course. We just offer our experience so first timers can have the best shot at success.

Pelican Parts offers the Supertec Case Sealant Kit with everything you need in one place.