Oil leak guidance

[Simonjjb]

I now have 99.9% of the kinks out of my 71S which was a nuts and bolts restoration and full engine and gearbox build. However, I have what seems to be at least a couple of oil leaks. The engine and gearbox shop have offered to take the car and fix without cost. Before I do that, and in the interest of learning, I thought I would see if I could fix first. There seems to be at least two engine leaks and also a gearbox link - blue color. Attached below are some photos. Seems like I would need to remove the heat exchangers yo get a decent look. Any advice ?

[Simonjjb]

[Simonjjb]

A few photos

[Scott A]

I know a long long term Porsche mechanic, he sprays this transparent clear film on his seams.
He sprays it about 3 or more times, letting it dry and build up, and pretty heavy.

He usually does it after a rebuild, and turns his motor upside down on the engine stand.

He never has a leak.



He even does it with every oil change at the big nut.
(I’m just the messenger here).

[Richy]

It appears to be Swepco oil in the transaxle , in my experience this oil essentially dissolves Yamabond type sealants , I'm not a fan . The one leak at the bottom of the trans - engine may be coming from the oil thermostat , oil pressure sending unit area . There are probably a hundred places for oil to leak on a 911 engine so good luck .

[uai]

The best method for finding leaks:
Pressure wash (really thoroughly)
Let it completetly dry
Genreously powder with French Chalk (or similar e.g. baby powder)
Don't be shy (it washes off easily) I sometimes blow it with pressurized air to the hard to reach sports.
Prepare Endoscope / Mirror Lamp etc. and go for a short drive (1-2 miles).
You'll see where it leaks. Don't drive too far otherwise you won't see where it leaks.


If you drive too far you won't see where it leaks

[RSTarga]

Some times our cars leak when not used much. Getting things nice and hot might help.

[Richy]

Getting things hot will absolutely not help , maybe some oil on the heat exchanger will burn away .

[Troos]

I find this stuff effective. Obviously a thorough engine clean is necessary prior to use. https://www.amazon.com/dp/B002M4G24U...=auto+oil+leak
Tom

[edmayo]

Sometimes it isn't the mechanics fault. I once had to do a flywheel seal twice (964) . (Porsche dealer seal) When it leaked again a conversation with Wrightwood, Rosemary suggested using old style SC black/brown seal. Solved leak!