Help- Oil Leak between head and cam tower

[Kftca]

Good day all: I did a reseal on my 78 3.0 last year and after completion I had a small but annoying oil leak oncoming off the front edge of the cam tower. ( which of course drips on the exhaust).
I finally found the source- there is a drip off No 3 head to cam tower joint. It is right at the bottom , and is very small but it is there. This joint is sealed by the Locktite 574 and I am the one that did this job and obviously I did not get this 100% right.
The question: has anyone ever tried to seal this leak without disassembling the engine ?
Any advice appreciated . Thanks Karl

[john walker's workshop]

Could be a rocker shaft....

Did I ever say I hate 574?

[Trackrash]

Originally Posted by john walker's workshop

Could be a rocker shaft....

Did I ever say I hate 574?

What is your recommendation?

[Kftca]

Hi John: yes I checked the rocker shafts first. I redid these last year and added the rsr seals . They all look tight, and have not moved . I would appreciate your recommendation if you have any suggestions. Btw , have you had trouble with 574 before and what do you use instead ? Thanks Karl

[david.avrahami@]

Small leaks, sooner or later, become bigger leaks...
If you decide to disassemble the engine, do a top end overhaul while you are there...

[AndrewCologne]

Originally Posted by Trackrash

What is your recommendation?

https://nineelevenheaven-wordpress-com.translate.goog/abdichten-der-kipphebelschafte/?_x_tr_sl=de&_x_tr_tl=en&_x_tr_hl=de&_x_tr_pto=wapp
(Translated via Google)

[mikedsilva]

Originally Posted by AndrewCologne

https://nineelevenheaven-wordpress-com.translate.goog/abdichten-der-kipphebelschafte/?_x_tr_sl=de&_x_tr_tl=en&_x_tr_hl=de&_x_tr_pto=wapp
(Translated via Google)

Yep
I have done this on a couple of cars with less than perfect shaft sealing, and it has so far held up well. The fact it is curil T also means when it needs to come out, it can still be easily cleaned off too.

[Trackrash]

Originally Posted by mikedsilva

Yep
I have done this on a couple of cars with less than perfect shaft sealing, and it has so far held up well. The fact it is curil T also means when it needs to come out, it can still be easily cleaned off too.

John, in my post above, I was refereeing to what do you recommend instead of 574 in the head to cam-housing seal ?
Porsche, in it's manual says to use Teroson Atmosit, which sounds like Yamaha bond.

Bruce Anderson says use RTV, (yeah I know).

Wayne, in his book says use 574.

In the Complete Engine Sealant thread Threebond 1184 is recommended.

I have heard of mechanics using Curl t, btw.

From my research;
Yamaha bond = Threebond 1184 a synthetic rubber sealant?
Threebond 1211 = RTV a silicone based sealant?

What say the experts?

[john walker's workshop]

Gray Dirko for me. Case halves, heads to towers, 915 case sections.
574 is supposed to be applied very thin, like with a tiny roller, and the sections need to be tightened up quickly, before the stuff sets up when deprived of air, otherwise "shimming" can result, as described in the 574 PDF. That's when the stuff doesn't get squeezed out and sets up before tightening. Lots of folks tighten the case through bolts first, then do the perimeter nuts. Big mistake. Often the cause of the dreaded leak between the case and #8 main bearing, when shimming happened and the case halves didn't get pulled together properly before the stuff set up. Use it at your own risk. I just spent a lot of time scraping thick deposits of 574 off the case halves of a 3.0 I'm building now. My first personal experience with shimming was a 77 930 engine i did about 30 years ago. #8 bearing/case leak. Total teardown to fix and lots of wasted time. Done with that stuff.

[proporsche]

i never had a problem since i do the case as you said John...but there is always new stuff which can be use i`ll give it a try on my next 930 engine next week.I know you told me once but i cannot find exactly the Gray Dirko number....would you share
thanx
ivan
could it be this one?
https://eshop.svetluska.cz/fotografie/max/tesnici-tmel-dirko-70ml-seda-elring-el036-164-3018820.jpg

[john walker's workshop]

That's it, and also the 510-030, 575 degrees.

[2svnhvn]

I have had excellent results using Dow Corning 730 sealant. Either the added benefit of being easy to remove if you have to disassemble again

[john walker's workshop]

Gotta be fast with 730 as it skins over real quick, unlike dirko.

[pkabush]

This seems like a much better approach. I’ve never used 574 but I’ve done a lot of reading on it.
Seems like a total PITA due to the quick set time. I used Hondabond for the first time the other week and I was surprised at how quickly it skinned up. I ended up dismantling my CV joints and scraping it all off. It went better the second time around since I knew what I was up against. I couldn’t imagine trying to get the case halves buttoned up before the 574 starts to set. I know many people do it successfully but, given the above information I’ll use Dirko.

[proporsche]

[QUOTE=pkabush;11657088]This seems like a much better approach. I’ve never used 574 but I’ve done a lot of reading on it.
Seems like a total PITA due to the quick set time.
Yes, it is all about practice .I do the outside 1st, after the case bolts all done about 20-30...minutes..never had problem, this one is done at home in the kitchen .Also the 574 must be only used on one side of the engine case...i do not use roller just spatula for sorting pharmacy pills
here
https://www.youtube.com/watch?v=IandhtwG5no&t=377s
https://www.youtube.com/watch?v=2S0OuXyfIMU&t=5s

[pampadori]

is Dirko gray essentially RTV silicone?

[theiceman]

Originally Posted by Kftca

Hi John: yes I checked the rocker shafts first. I redid these last year and added the rsr seals . They all look tight, and have not moved . I would appreciate your recommendation if you have any suggestions. Btw , have you had trouble with 574 before and what do you use instead ? Thanks Karl

it might be tight but is it dry ??? i had your EXACT issue after a rebuild, you rev the engine and you see it literally start to run down the back of the chain case..
it did indeed turn out to be that rocker shaft end that faces the chain case..

[dannobee]

Originally Posted by pampadori

is Dirko gray essentially RTV silicone?

Yes. But don't be afraid of modern RTV's. They're successfully used on MILLIONS of vehicles that don't leak. Like John, I would never assemble a Porsche engine with 574. There are far too many better sealants available now.

Three bond product comparison.

https://threebond.com/wp-content/uploads/Products-Guide_ver6-LOCAL.pdf

[theiceman]

i actually used 3 bond on one side of my engine and 574 on the other. People seem to forget 574 was used successfully for decades. Just because there is better out there doesnt mean it is bad.

My car is dry.

[proporsche]

the only thing you need to watch for on 574 is the dates...if the orange is expired it will create inside sand like a stuff,that is totally PITA to use

Ivan