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Oil Leak
I know there have been many posts regarding this subject. Here is my problem:
My oil leak appears to be coming from between cyls 4&5. It seems to be more prominent when oil is at correct level on dip stick. It usually happens after care is warmed up. No oil dripping on exchanger so I dont think it is a return tube. It runs down the case and then runs the length of the case toward the trans where it drips. The funny part is that it does not always leak. Anyone have any ideas on what I should check. 1983 911SC 3.0L Thanks Bill |
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09-24-2001, 11:05 AM
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Join Date: Jun 2001
Location: Sweden
Posts: 5,911
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Ahhhh....my favorite....let me guess, you also have tell-tale dual oil puddles on the floor?
It's most probably oil-pressure sensor, located behind airbox. It's sealed with plastic and usualy leaking over clutch-case. It's common and cheap problem (if you recoginize it  Sensor costs 10$ in the shop. When you're done with that, check out return-tubes, then valve-gaskets (in that order). Cheers! |
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09-24-2001, 11:56 AM
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Anyone replace the oil-pressure sensor while engine in car? 83 911 SC with CIS
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09-24-2001, 02:03 PM
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Join Date: Mar 2000
Location: Irvine, CA
Posts: 1,200
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Its very easy to do.
Just remove the top of the air cleaner (10 seconds) and the CIS boot (2 minutes). You can then reach back there and feel it. With a mirror back there (and a flashlight) you can see it. With a deep socket and an extension, its easy to get to. Once you've done it once, its a 10 minute job, because you can do it all by feel. For a first timer, it may take 3-4 times as long, but its still an easy job. And, BTW, they leak ALL THE TIME! |
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09-24-2001, 02:22 PM
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Irrationally exuberant
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If you haven't already, clean the bottom of the engine off. I use one of those car washes that have the sprayer. Try to be sure about the source of the leak. Any oil under there gets blown all around making diagnosis more difficult. I'm not convinced it is the oil pressure switch but since they tend to leak soon enough there is no harm in changing it. Right beside it is the the oil thermostat. It has an O-ring that like to leak also. These twos will cause a leak in the area of #6/the oil cooler/flywheel.
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09-24-2001, 03:13 PM
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Join Date: Jul 2001
Location: Denver Area
Posts: 1,017
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My 78 leaks in the same general area, but I thought you had to drop the engine to get at the oil pressure sender???? Or am I thinking of the oil temp sender????? Thanks
------------------ plain fan |
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09-24-2001, 05:44 PM
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Ok... how about this one. I found it the other day. The leak is at Cyl #6. I'm not sure where it's coming from... any ideas? There is some plug fouling on #6.
 Ps. The car is an '87 911 w/ 59k miles ------------------ Dan Tolley 1987 911 Coupe http://www.cheaterswayside.com/911/gallery.asp?sort=0&userid=294 |
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09-24-2001, 10:37 PM
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Join Date: Jun 2000
Location: Holland
Posts: 85
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Looks like you have perhaps a broken head stud and that the oil is leaking on the base of your cylinder.
------------------ Joris 75 911S http://members.xoom.com/joogie/Joogie.htm |
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09-25-2001, 01:10 AM
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I was thinking head stud, but there is no noise, and all the studs appear tight.
------------------ Dan Tolley 1987 911 Coupe http://www.cheaterswayside.com/911/gallery.asp?sort=0&userid=294 |
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09-25-2001, 07:47 AM
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1983 Porsche 911SC Targa 3.0L 
The Blue Pheonix
1987 Porsche 911 3.2 
