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Thread: Oil leak guidance

  1. #1
    Senior Member Simonjjb's Avatar
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    Oil leak guidance

    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 ?

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    1968 911L Coupe - Golden Green
    1971 911S Coupe - Gemini Blue
    1973 911S Targa - Signal Yellow
    1974 914 2.3 - Sunflower Yellow

  2. #2
    Senior Member Simonjjb's Avatar
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    Attached Images Attached Images  
    1968 911L Coupe - Golden Green
    1971 911S Coupe - Gemini Blue
    1973 911S Targa - Signal Yellow
    1974 914 2.3 - Sunflower Yellow

  3. #3
    Senior Member Simonjjb's Avatar
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    A few photos
    1968 911L Coupe - Golden Green
    1971 911S Coupe - Gemini Blue
    1973 911S Targa - Signal Yellow
    1974 914 2.3 - Sunflower Yellow

  4. #4
    Senior Member Scott A's Avatar
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    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.

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    He even does it with every oil change at the big nut.
    (I’m just the messenger here).
    Last edited by Scott A; 07-15-2023 at 05:41 AM.

    Current long term ownership: 63 Cab, 71 911, 74 914

  5. #5
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    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 .

  6. #6
    Senior Member uai's Avatar
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    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.
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    If you drive too far you won't see where it leaks
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    Last edited by uai; 07-17-2023 at 04:29 AM.

  7. #7
    member #1515
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    Some times our cars leak when not used much. Getting things nice and hot might help.
    David

    '73 S Targa #0830 2.7 MFI rebuilt to RS specs

  8. #8
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    Getting things hot will absolutely not help , maybe some oil on the heat exchanger will burn away .

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