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Help with oil leak

Recently took my car to the local air cooled Porsche mechanic for an oil leak, he replaced my oil cooler for lots of money.car went back to him a week later for the same oil leak, had the cracked case by the oil cooler seeping.the backside has been sealed up. Still have an oil leak.it does not seem as though it’s coming from the top . It seems as though it is something behind the oil cooler? Can’t really see.does the backside where that case crack is leak also?
Old 01-01-2018, 11:04 AM
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Old 01-01-2018, 11:07 AM
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Old 01-01-2018, 11:08 AM
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Hard to tell from the pictures
Old 01-01-2018, 11:12 AM
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2stroke,

Get some engine degreaser and spray the oily areas. Pressure wash and then look for origin or leak (s).

Best of luck,

Rahl
Old 01-01-2018, 12:53 PM
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Could be from the cooler seals. BTDT I'll find the thread that I posted.

As you are not doing you own mechanic this can get very costly. Like Rahl mentioned, clean as much as possible to see where its coming from.
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Hey, nice marmot.
 
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You didn’t say what year.

Behind the oil cooler is a case defect from the factory. Porsche issued a service bulletin on it. It has been covered here many times. Search for oil cooler defect TSB and you’ll find posts about it. When you take the oil cooler off you will see a little indention on the left side of the case where the cooler mounts. There will be oil seeping from that spot. Clean it good with a degreaser and then use some JB Weld to fill it in.

There has also been some debate about the type of orings to use on the high pressure tubes at the top of the oil cooler. The green type seem to fail. The reddish brown colored ones seem to be the preferred. I don’t think it matter on the lower low pressure opening.
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Old 01-01-2018, 01:12 PM
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Hi..the amount of oil leak you have ,looks like it was there for a while as we can see the burned oil on the EGR pipe.
Do your self a favor.Take a mirror and look your self on the top of the engine .It is called here the triangle of dead--look it up.
Also the oil could be leaking behind the oil cooler from the same spot as you have put the duck-tape on front. It is on every 911 from factory when manufacturing the engine cases.The earlier models had rubber plug later model did not leak.
look here on picture.To seal it use JB weld epoxy.
The replacement of the oil cooler is a good question.Did the mechanic gave the old cooler back?

Ivan
Old 01-01-2018, 01:13 PM
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I don’t think tape is the answer.
Run it from cold until the thermostat opens. Are you leaking while cold, or after the thermostat opens? Wrench should have changed the seals on the cooler when he had it off.
There is a natural leak potential behind the cooler opposite where you have tape.
Apply JB weld under the tape after cleaning and wire brushing area
Most important, when is it leaking
Bruce
Old 01-01-2018, 01:24 PM
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Yes... My best guess is that it’s probably leaking on the opposite side of where I have the duct tape, but that involves removing the motor again.can’t really see up in there.and it is not coming from the top of the motor
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The puddle on the ground formed after driving it for an hour and then parking it overnight
Old 01-01-2018, 01:29 PM
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Quote:
Originally Posted by tirwin View Post
... There has also been some debate about the type of orings to use on the high pressure tubes at the top of the oil cooler. The green type seem to fail. The reddish brown colored ones seem to be the preferred. I don’t think it matter on the lower low pressure opening.
Correct the reddish brown (Elring) fix my problem.

Quote:
Originally Posted by JJ 911SC View Post
Since I'm using caliper on flexible rubber, the measurements are not perfect (I/D + 2 thickness is not exactly the O/D) but close.

The one’s from Elring fall in between those that were in and the green one.

Measurements are the same between 2 set of Green and 4 set of Red/Brown.

The large Red/Brown got almost a glossy finish when compare to the small one.

The Elring ones fall in between the Red and Green.

The green ones are always Taller, smallest O/D, biggest I/D and the thinnest one.

So I put the Elring one in, torque to 25mm and its not leaking in a static condition like the green one was.

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Tirwin ,where the heck did you hear about the green o rings being bad.These types are the only o ring you should ever use on Porsche 911 engines.
If you click on his garage you would know what year is his 911 also being there EGR pipe for air injectors makes it either 1978 or 1979..

Ivan
Old 01-01-2018, 01:38 PM
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Quote:
Originally Posted by proporsche View Post
Tirwin ,where the heck did you hear about the green o rings being bad.These types are the only o ring you should ever use on Porsche 911 engines...
Not from my experience, start at post # 1 of Oil Cooler Seals Leekage with the Engine on the Wall
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Old 01-01-2018, 01:57 PM
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Hi JJ ,i do not do a lot reading i just go by my experience of over 30 years with these beasts...basically the brown rings suck...i have build maybe over 40 engines in my 911 live ,while doing the jobs these rings went strait to trash can..;-)..

Ivan
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check your thermostat o-ring and the breather gasket
Old 01-01-2018, 02:32 PM
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Quote:
Originally Posted by proporsche View Post
Hi JJ ,i do not do a lot reading i just go by my experience of over 30 years with these beasts...basically the brown rings suck...i have build maybe over 40 engines in my 911 live ,while doing the jobs these rings went strait to trash can..;-)..

Ivan
Pas de problème, just my experience, might be a fluke: fitted Red were good, Green were leaking and Brownish were good and still are.

Bonne Année
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Old 01-01-2018, 02:39 PM
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hi Brujo he keep saying he has no oil leak on top look above...it sure looks like the TOD..
Ivan,

2strokes..are you actually saying a Porsche mechanic was working on your 911??

On the oil cooler are wrong nuts...that is not normal to me..and why is the metal shroud on cyl.number 6 bend like this??
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Yes he is definitely a seasoned Porsche mechanic, that’s all he works on
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and he is the only one in my area, and I feel that he has done poor work for me and am looking for a new mechanic.
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