Oil cooler or engine case leak?
 

I'm chasing an oil leak from the oil cooler / triangle of death area. TOD seems dry but after removal of the engine oil cooler, I notice a lot of oil in there. (Oil cooler seals were replaced recently)
http://forums.pelicanparts.com/uploa...1591732089.jpg

I already found the TSB to JBWeld the engine case via this link and suppose this will fix the biggest leak.
https://forums.pelicanparts.com/porsche-911-technical-forum/1011282-leak-cooler-seals.html

However I'm also worried about the oil in the upper part/chamber, what's my best guess?
Also coming from the case leak below.?
Still seals although they were changed recently?
Oil cooler itself?
Any other thoughts?

your oil cooler lower o ring looks old and crushed..what color is it ,i see blue??let see the upper o rings..also you need to clean the case and apply JB weld on the drill trough spot outside and inside
Ivan

Thanks, all three seals are new + I'll do JBWeld as stated. Question was more if this will be sufficient considering oil in upper part

ok seals are new but what color ??not the one on picture..You should only use green o rings..it is called VITON material

Ivan

Pressure test your cooler before putting it back on.

To add to pressure testing, go ahead and send it to Pacific Oil Cooler for testing and cleaning. It will return looking brand new. During my rebuild they refurbished mine and found two micro cracks that were repaired with brazing. Great service!

When was the case last split? Could it be the o-rings under the acorn nuts?

you can always loose those case nuts and remove the washer and peek behind..it will not efect nything .Then get new Green o rings ,slide them on and make it tight..let me see if you do this the o ring before you remove them.....

Ivan

Don’t mean to hijack this thread. I’m chasing a similar oil leak right now. Where is the “drill trough“ you are referring to?
TIA
Johan

Uwon ..look here Mike went trought this not too long ago..there is the bulletin ttps://forums.pelicanparts.com/porsche-911-technical-forum/1011282-leak-cooler-seals.html

Ivan

fix this area according to tech bulltin

as one can see the thin casing is broken away and leaks. common failure.
that's why Porsche recommends fixing it.

http://forums.pelicanparts.com/uploa...1591796213.jpg

http://img.pccreation.net/photos/201810251956348536.JPG

flojo..there was never thin casing on earlier models of 911 it is always rubber-plastic tubing on the inside the case....plus the bulletin is wrong..the sealed cases are from 1984-5;-)
Ivan

............

His picture shows the exact problem area with failure.
so this should help him.

Fact is, the thin bit of casing in the dents (inside/outside) tends to fail.
Failed to me and many others, so why argue with the tech bulletin?
And myself know of at least two 87 cases we had to seal.

flojo i`m not arguing just from experience i know the earlier cases leaked and later (not from 1989) did not..then again it is possible us market and euro market was different;-)?For example my 911 never had plugs and is has solid casing...on both sides
believe me even bulletin can be wrong...again experience.....there was never casing just a rubber plug on each side---on earlier models...

Ivan

P.S. just think about this --the problem with this leak is there since ever and suddenly Porsche issues a bulletin in 1989;-) how about that.....;-))

So does this mean the case on my '88 is okay?

jlex, most likely ..it is an easy task, look under next to the oil cooler the engine casing will be solid closed.............
Ivan

But this would require taking off the oil cooler first, right?

no ...look under the car towards the oil cooler both sides are identical, what you see on bulletin on left is exposed to the outside..will be the same behind the oil cooler..
Ivan

Okay, thanks Ivan. It looked to me like the repair area was hidden behind the cooler.