Oil leak from engine... before I pull it again...

[Flojo]

Engine is clean and fresh and came back in with fresh trans in autumn 2017.
also new crankshaft seal (FEBI, German aftermarket supplier).

drove it and had to pull it a weak later again due to leaking trans shaft seal.
changed as well the crankshaft seal to KECO from PAD while I'm in there. guess I panicked.
snug fit, all clean, no issues.

(here's the post of the issue back in October 5)

since then just a few stints of spirited driving.

now it leaks again. it leaks in a way it hasn't done before.
its not trans oil (different smell), and as far as I can tell it is not the trinity.

thoug the seeping coms from inside the clutch bell... you gonna tell me it's the pulley seal?

anoying but obvious. but I cannot really believe it.
or am I missing something?
ever anybody having an issue with the leaking of the mating surfaces of the case halves in that area (behind flywheel) ?!

***
a picture from Septemer 2017, 1st seal change...

[tirwin]

I replaced the rear main seal a couple of years ago. I was advised by people here to get a particular seal. The only place I found it for sale was Patrick Motorsports. I was under the car recently and it looks like I have some weeping and I'm wondering if it's the same problem again. I have read that if you don't place the seal at the correct depth it will leak.

I haven't been brave enough to pull the motor again to have a look. I cleaned the bottom of the engine thoroughly. Next step is to run the engine while on the lift and see if I can tell for sure where it's coming from.

[juanbenae]

if there are any left over smudges of the case sealer on the block where the seal mates it can groove the seal and cause a leak. I had this occur and was pissed.

[boyt911sc]

Originally Posted by tirwin

I replaced the rear main seal a couple of years ago. I was advised by people here to get a particular seal. The only place I found it for sale was Patrick Motorsports. I was under the car recently and it looks like I have some weeping and I'm wondering if it's the same problem again. I have read that if you don't place the seal at the correct depth it will leak.

I haven't been brave enough to pull the motor again to have a look. I cleaned the bottom of the engine thoroughly. Next step is to run the engine while on the lift and see if I can tell for sure where it's coming from.

Tim,

Not everything you read in the Internet is correct. One of the misinformation was this crankseal installation. For 3.0 SC engine the crankshaft seal should be installed flush. I have shown and demonstrated this myth in my recent engine rebuilding classes. If you installed this seal indented, you are looking for trouble ahead.

Someone posted a technical bulletin in this forum. It does not apply to 3.0 or 3.2 engines. Anyone who wants to dispute this better prepare facts and know their measurements. You should include this subject in your “Dummy thread”.

Tony

[Trackrash]

My old '71 motor does seep at the case halves below the flywheel seal and below where the oil pump is. Only a drip every now and then. Just enough to make a mess. You may also want to check your sump plate, if you have one. That can look like the front of the motor due to the oil being blown.

[Flojo]

Sump plate (with the drain plug) is fine.

this is where it leaks out... it is that much, that even when clean wiped after driving and letting it sit it keeps leaking (engine pressure?) and stains the cardboard quite a bit. never had that before.
guess I'll only have peace of mind, when pulling the engine

[Trackrash]

Are you sure that isn't trans oil?

[Flojo]

yes. I know its smell. way different.

[pampadori]

Its a feature- Lets you know there is oil in the motor without having to actually pop the decklid.

Mine leaks a little bit too. I went with the orange seal if that matters to any viewers at home. doesn't leak bad enough to pull apart at the moment though.

DId you put a light schmear of Curil T on it prior to pressing in? I would do that next go.

[proporsche]

hi Flojo..you should only use crankshaft seal made by Elring...i only use this type and never had a problems like with other brands
this one

[deftom]

Hi,

Don't you have a groove on the crank shaft that my cause the leak?

[proporsche]

if you think engine oil ..then it must be the flywheel seal.But when you do not put on a guide tube the little o ring ,that being bad will leak exactly like this.The tube with the o ring is a tricky to install and i have seen mechanics brake while installing the tube to brake the o ring...

Ivan
the o ring goes here in the groove

[Flojo]

Originally Posted by proporsche

hi Flojo..you should only use crankshaft seal made by Elring...[/IMG]

As a third, I will order the Elring (after Reintz and KECO)

Originally Posted by pampadori

DId you put a light schmear of Curil T on it prior to pressing in?

regarding "gluing" it for install, I did not, as prior to trans refurbishing, I read a lot about NOT to curil-T any of the seals...

Originally Posted by deftom

Don't you have a groove on the crank shaft that my cause the leak?

I read about that as well, prior to trans refurbishing. I did not notice anything obvious of that kind after cleaning the seal area.

In all, I will over think all that... let's see.
Maybe when pulling the flywheel the leaking spot will come obvious.

I keep you informed.

[tirwin]

Originally Posted by proporsche

hi Flojo..you should only use crankshaft seal made by Elring...i only use this type and never had a problems like with other brands
this one

This is the one I used.

[Flojo]

Ordered

Elring Part No 311.989
OEM 999 113 264 40

Double layered seal ring. Exterior Fluor-Kautschuk/Interior Polyacryl-Kautschuk

Whish me luck!