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Join Date: Jul 2015
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Question NOW what??? 915 leaking oil

Dear Friends,

I have this 1976 911 with a 915 tranny, and the car was working fine, then I disassemble the whole car to restore it (took 1 year) and now the transmission is leaking oil

I changed the old oil for a new SAE 90 mineral regular oil ( I canīt get Swepco where I live )

And now, the once non leaking transmission, is leaking a lot.

First I thought that I put to much oil when I refilled it and this excess was coming out from to top breather but now I think that the leaking came from the (Transmission Differential Output Shaft Seal 999 113 183 40) because the whole transmission seems washed with oil and there is a oil spray pattern on the superior part of the chassis ( just like centrifugal force spray the oil )

Now I have a few questions:

1-) does it seem plausible? to leak oil from the seal and get sprayed
2-) did I put a too thin oil?
3-) Can I change the (Transmission Differential Output Shaft Seal 999 113 183 40) with the engine and the tranny in place?
4-) How do I remove #14 Joint flange? Just unbolt and tap it out?
5-) I notice that the bolt #16 is a elastic bolt. What does that mean? That mean that I must install a new one since once this bolt is tightened it loose itsshape?
6-) Why in this PET file (74 77 katalog, page 147 I donīt see the Shaft seal ? Just the flange and the bolt
7-)What is the torque on this elastic bolt #16
8-) Should I replace the big "o" ring (999 701 392 40) that seal the transmission cover as well?

Thanks for the help

Ricardo







Old 09-12-2017, 04:34 PM
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I would check the orientation of the hole in the vent on the top of the 915. It needs to face the front of the car. I had mine turned slightly to the side with freshly installed seals and had so much oil coming out of the vent hole it was dripping from everywhere. Rotated the vent hole forward facing and all was good.
Old 09-12-2017, 05:16 PM
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Is this a seal ? Yes that is the seal #10 in your second pic. I doubt it could be leaking the amount we see in your other pic. Easy enough to replace that seal however.
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Old 09-12-2017, 08:51 PM
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Quote:
Originally Posted by Trackrash View Post
Is this a seal ? Yes that is the seal #10 in your second pic.
think so too. I'd clean it and apply some talcum to sure localize theis area/seal as the culprit.

re/ SAE90 and restauration...: I'd not blame SAE90 as ist the right stuff for a 915. I'd rather accept, that a full restauration ist NOT a guarantee to not worry anymore.
Ask yourself: was this seal touched during resto? If yes, maybe it just got bad (aftermarket part?). If not, well, then it should have.

change it.
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Old 09-13-2017, 03:02 AM
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Dear Friends,

Thanks for the help Iīll follow the advises to try to solve the problem

Regards
Old 09-13-2017, 03:14 PM
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Dear clarkd,

You are a genius! My vent orientation was about 20 degrees out of alignment and all that oils spelt out
Neve in a million years I'll think in something about it !

Thank you so much and all Pelicans members that chime in
Old 09-23-2017, 12:16 PM
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