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1986 928: Oil in engine valley?

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Old 05-07-2019, 11:43 AM
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Fox_
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Default 1986 928: Oil in engine valley?
I noticed the valley of the engine was full of oil, puddling across the bottom under the intake manifold.

Throttle body was covered in oil.

Thoughts?
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Old 05-07-2019, 11:48 AM
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FredR
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The usual primary suspect is the seal on the bottom of the filler neck
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Old 05-07-2019, 12:40 PM
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WYAIT rabbit hole alert...😉
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Old 05-07-2019, 12:48 PM
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Big time deep dive down the hole.
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Old 05-07-2019, 12:50 PM
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Bertrand Daoust
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Originally Posted by FredR
The usual primary suspect is the seal on the bottom of the filler neck
+1.
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Old 05-07-2019, 01:01 PM
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Originally Posted by FredR
The usual primary suspect is the seal on the bottom of the filler neck
Thanks.

Will look into it.
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Old 05-07-2019, 07:36 PM
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Please post a picture of what your seeing
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Old 05-08-2019, 09:40 AM
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Petza914
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Speaking of the valley, anyone know where to purchase the plugs that go in the holes in the valley, specifically a center one if it's different. They're not by chance the same size and thread as the cam tower plugs are they?
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Old 05-08-2019, 02:36 PM
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Originally Posted by Mrmerlin
Please post a picture of what your seeing
Not the easiest thing in the world to get a picture of, but I tried.




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Old 05-09-2019, 12:39 PM
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I found this thread, which seems to have more information.

https://rennlist.com/forums/928-foru...-manifold.html

This post:

Originally Posted by Landseer
The two crankcase breather hoses on the early 32V cars that run to the passenger cam cover get sticky soft, break down and get holes in them. Check at the base of the oil filler area. Will spray engine compartment with oil and fill below the throttle body and the cavities closer to the water pump / front of engine. I've got an 85 and an 86 that both had this happen. Could be something else, but that's what fixed mine.





So we have oil filler tube or crankcase breather hoses. Now the question is how much of a PITA are these items to get to?

I've been under the intake runners on a 4.5 car, but not a 5.0.
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Old 05-09-2019, 01:20 PM
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when i did the intake refresh on that engine all of the hoses were replaced maybe 4 years ago
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Old 05-09-2019, 02:23 PM
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Originally Posted by Mrmerlin
when i did the intake refresh on that engine all of the hoses were replaced maybe 4 years ago
How would you suggest to proceed?
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Old 05-09-2019, 10:41 PM
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Shawn Stanford
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I found a lot of oil in the valley when I did the timing belt on my '82. It turned out that the bolts holding the filler neck to the block had loosened over time and weren't even hand tight. I tightened them back down and that solved it.
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Old 05-11-2019, 08:32 AM
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Originally Posted by Fox_
How would you suggest to proceed?
there are so many variables; you should pull the intake and go from there.
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Old 05-11-2019, 09:42 AM
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check the oil fill bolts first
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