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Drmc911
 
Join Date: Jan 2012
Location: Lexington park, MD
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928 Engine oil leak....

I just picked up a 1978, 928 and upon cleaning the engine, then letting it run for a couple of minutes to dry off, I found that it has an oil leak somewhere on the top of the engine, if you look down it what could be considered the valley you can see the oil, I also had oil in the air cleaner, does anyone have an idea of where it could be coming from???

Old 09-12-2013, 01:59 PM
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You actually were able to clean the valley without removing the intake spider? Your 78 is due for an Intake Refesh which includes replacing "all" the rubber hoses.
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Old 09-12-2013, 02:34 PM
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My 84 had a similar leak..... Check the oil filler gasket, mine was torn
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Old 09-12-2013, 03:19 PM
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Drmc911
 
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oil leak

Does anyone have a kit for this?? sorry for the questions just new to this type of engine
Old 09-12-2013, 03:47 PM
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can you confirm you have a leak - or just 30 yrs of the oil spillage from oil fills? This oil spillage will end up in the valley and this oil is very difficult to get out without some disassembly. Obvious leak point is as mentioned - bottom of the oil filler neck. I do not know about 78, but my 86 has no gasket - has a steel plate with rubber ring. you can try tightening it first?
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Old 09-12-2013, 03:56 PM
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Drmc911
 
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Oil Leak

I was able to confirm there was a leak, I cleaned it all up with oil adsorbent matt and found water and oil. I then started the car ran it for about 30 min, checked it again and it was covered in oil again, no water.
Old 09-12-2013, 04:00 PM
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Petie3rd
 
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you could tighten the oil fill mounting bolts ,


remove the oil fill cover and screen look down the tube and you will see a bolt 10mm,
tighten this one ,
and the one on the other edge of the fill tube,
this is closer to the right side of the car
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Old 09-12-2013, 04:58 PM
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If tightening the bolts don't fix the leak, you will need to replace the paper gasket between the Filler and the block... like I said previously I just replaced mine and in order to remove the filler neck you first need to remove the waterbridge....
While you have these parts off, I would recommend you do a complete top end refresh...
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Old 09-12-2013, 05:26 PM
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Quote:
Originally Posted by Bills928 View Post
If tightening the bolts don't fix the leak, you will need to replace the paper gasket between the Filler and the block... like I said previously I just replaced mine and in order to remove the filler neck you first need to remove the waterbridge....
While you have these parts off, I would recommend you do a complete top end refresh...
Needless to say, but I'm gonna say it anyway: It's a slippery slope!
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Old 09-12-2013, 09:39 PM
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Quote:
Originally Posted by stepson View Post
Needless to say, but I'm gonna say it anyway: It's a slippery slope!
Agreed..... After I bought my shark, I just wanted to change my fuel lines to be safe.... Well before I knew it I had the whole top half of the engine apart...
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Old 09-13-2013, 04:53 AM
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Petie3rd
 
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the upside to making an intake refresh out of an oil leak,
is that the car will be good for another 25 years,
so all you have to do is drive it
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Old 09-13-2013, 09:58 AM
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See Post #2 ^^

The only kit you'll find is the vacuum hoses kit made by Carl at 928 Motorsports, but there is much more than that involved. "ALL" Rubber needs to be replaced, O-Rings, etc. Don't remember any gaskets, but it's been awhile. Plus I like Red RTV as nothing get's past that, even oil

...then while you got the Intake apart, get to all your rubber fuel hoses as well. There's a write up in the "Common Fixes" Thread.
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Old 09-13-2013, 10:14 AM
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1985 Porsche 928s
 
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Quote:
Originally Posted by Bills928 View Post
My 84 had a similar leak..... Check the oil filler gasket, mine was torn
The "valley" on my '85 was pretty full of oil when I tore my engine down. I suspect the filler neck gasket as well.

I think the thing with 928's is knowing when to stop. The phrase "I might as well do this too while I'm at it" will get you in pretty deep before you know it. Take notes & pictures as you go.
Old 09-16-2013, 11:28 AM
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WYAIT, while your already in there.

928srus and 928intl both with www and .com are good about putting together complete kits, and even better extra complete kits with more stuff than you are likely to use, but all the stuff you might use, and then accepting anything back you don't use.
Old 09-16-2013, 10:36 PM
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Petie3rd
 
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to reseal the oil fill tube to the block,
I would suggest to use Hondabond 4 its better than the red RTV ,
use a generous amount and it should never leak

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Old 09-17-2013, 05:51 AM
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