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Join Date: May 2012
Posts: 40
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911 2.4 1973 oil leaks
Hello all
Very bad surprise when I've dismantle the exhaust exchanger... To your opinion what is the best way to "repair" this oïl leak??? The engine is 2.4 T (carb) 1973 Thank you for your help... 
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06-04-2017, 10:32 AM
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Join Date: May 2004
Location: Lake Cle Elum - Eastern WA.
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Next step: Check for broken studs/head bolts. If that's the case, top end job. Not good news.
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Bob S. 73.5 911T 1969 911T Coo' pay (one owner) 1960 Mercedes 190SL 1962 XKE Roadster (sold) - 13 motorcycles |
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06-04-2017, 11:22 AM
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Join Date: Oct 2014
Location: Bordeaux, France
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No easy repair as it appear to be leaking from the cylinder base gasket. You can remove the valve covers and check the head studs as Bob suggested. In the (unlikely) event that those are simply loose, you could try to re-torque them. If the studs are stripped, they won't torque and you'll be thinking about dropping the engine and at the very least removing the heads and cylinders.
If you have some time and energy, I would consider getting Wayne's book and doing it yourself. I just did my engine (also a 2.4) and it was easy with the book and help from this forum. Good luck
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___oOo___ 1972 S 911 Targa kit http://forums.pelicanparts.com/porsche-911-technical-forum/863768-thats-my-first-911-restoration-thread-72-911-s-back-grave-maybe.html |
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06-04-2017, 11:32 AM
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Hi Alex..first have a look at the top of you engine.There is a thermostat o ring , oil pressure switch for an idiot light on dash...also breather hose attached to the breather cover on top could be the culprit.Since you have cars it should be easy to see.
here is old pic..  thermostat o ring example  Ivan |
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06-04-2017, 11:35 AM
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Under the radar
Join Date: May 2007
Location: Fortuna, CA. On the Lost Coast near the Emerald Triangle
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^ +1
Definitely check for leaks on top as mentioned above. If that leak is not dripping on your exhaust, I would not be too concerned. Do NOT try re-torquing the head studs, unless you are very brave. Mag case motors do not have broken head studs, usually. They are known for pulling the studs out of the case threads, particularly on the 2,7s. Unless you suspect the heads are leaking at the tops of the cylinders, I would not mess with the studs. If you suspect loose head studs put a hex wrench on the head nut and test for tightness with your fingers, not with a ratchet wrench. Now if you find studs finger tight, probably time for case savers.
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Gordon ___________________________________ '71 911 Coupe 3,0L outlawed #56 PCA Redwood Region, GGR, NASA, Speed SF Trackrash's Garage :: My Garage |
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06-04-2017, 05:32 PM
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Thank you all for your help!
I hope Proporsche and Trackrash are right!!!! The engine has in theory 110 000 km (68 350 miles) To your opinion is it an important mileage???? Obviously I'm confident in Porsche "Deutsch qualitat"!!!! If I have to "save case" I'll ask help of a mecanic... He has already worked on 2.7 engine and has met this problem! His cat is a local legend and used to sleep in Engine bay!!!!!!! Judge yourself! 
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06-05-2017, 09:30 AM
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I've seen many oil breather hoses leak and run down the engine like that. Especially the woven fabric covered type.
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06-05-2017, 09:53 AM
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Location: Portland, Oregon
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The 2.4 L T motor is relatively unstressed. At a rated 140 hp and 6500 max rpm, it has an easy life.
My 1973 has 165,000 miles as I write. The heads were done at 116,000 for worn valve guides and the top end at 157,000 when I blew the air box and dropped a nut into Cylinder 3. The studs are fine and are still in service. I would remove the fan and alternator and look at the top of the motor. I suspect you will find the external leak.
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Harry 1970 VW Sunroof Bus - "The Magic Bus" 1971 Jaguar XKE 2+2 V12 Coupe - {insert name here} 1973.5 911T Targa - "Smokey" 2020 MB E350 4Matic |
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06-05-2017, 08:42 PM
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Under the radar
Join Date: May 2007
Location: Fortuna, CA. On the Lost Coast near the Emerald Triangle
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Quote:
You might want to buy Wayne's How to Rebuild 911 Motors book. Everything you want to know there.
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Gordon ___________________________________ '71 911 Coupe 3,0L outlawed #56 PCA Redwood Region, GGR, NASA, Speed SF Trackrash's Garage :: My Garage |
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06-05-2017, 08:46 PM
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Hi Alex..no need to remove the alternator to see the oil leak.You have carbs ,so you will see it on top of the engine.Just take off the air filter housing....
Ivan |
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06-05-2017, 11:40 PM
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Location: Portland, Oregon
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Quote:
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Harry 1970 VW Sunroof Bus - "The Magic Bus" 1971 Jaguar XKE 2+2 V12 Coupe - {insert name here} 1973.5 911T Targa - "Smokey" 2020 MB E350 4Matic |
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06-06-2017, 07:55 AM
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hm... if it was the ToD, the the oilcooler would be filthy too.
Looks rather like a failed cylinder seal(?)
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Regards, Flo / 79 SC streetrod - Frankfurt, Germany Instagram: @elvnmisfit |
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06-06-2017, 08:30 AM
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Hello all...
After several weeks of engine works, we have found that the TOD was effectively the problem... Thank you again for your help! I received yesterday Wayne's How to Rebuild 911 Motors book. Superb!!!!! The Author recommends to change and buy a new oïl sensor to avoid leaks. (cheap part) I ll be very happy if you've others books recommendations!!! |
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06-25-2017, 09:31 AM
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Alex good job done....;-) u r welcome
Ivan |
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06-25-2017, 09:45 AM
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My Garage
1971 Porsche 911
Baja Bug
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