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Old 04-20-2002, 10:31 PM   #1 (permalink)
Chris Taylor
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Post Strange oil leak!

I just rebuilt the motor in my daily driver T and noticed a strange oil leak. I have drove the car 20 miles now and noticed a drop of oil under the car. It is dripping from the deck above the starter heat shield.

This is what is strange. The valve covers are not leaking. I can see all around them. So I thought it may be the back of the intake where the intake meets the head. I is dry as a bone. I have built over eight of these motors and never had an oil leak. My GN motor has been together for eight years now and no leak. I am baffled over this leak. It looks like the oil is weeping from the head and deck of the block at the corner of the block. I know there is not oil around this area. I thought there may be some porosity in the block behind the bolt hole where the heat shield bolts above the starter. It is dry and OK. I decked the heads and the block as always when building a motor.

There is no oil leaking down the back of the heads or block every thing is dry except for the one small area. I have looked under the car while it is running and the oil will not start leaking until the car is driven. This means this is a windage problem. Anyone ever ran into this problem before?

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[This message has been edited by Chris Taylor (edited April 21, 2002).]
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Old 04-20-2002, 11:26 PM   #2 (permalink)
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Any ideas???
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Old 04-21-2002, 12:07 AM   #3 (permalink)
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Rear main seal.
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Old 04-21-2002, 09:45 AM   #4 (permalink)
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The rear main is dry as a bone. The oil is only in this one small area. Thanks for the ideas.
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Old 04-21-2002, 10:00 AM   #5 (permalink)
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Head gasket, rear main or rear intake seal?

Remember, the rear main will sling oil around and make it appear like it's coming out of the starter. This sounds close to what you are describing.

How about adding some phosphorus oil treatment and then looking around with a black light?

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Old 04-21-2002, 10:19 AM   #6 (permalink)
Chris Taylor
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It is not the rear main. I can see all around it. I don't know how it can be a head gasket when there are no oil galleries around the oil leak area. The only place oil is near the head gasket is where it returns into the lifter valley. The intake is not leaking in the front or back. This is strange.

------------------
86 GN 11.0's
87 T Daily driver
87 T Drag Car under
construction

[This message has been edited by Chris Taylor (edited April 21, 2002).]
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Old 04-22-2002, 09:18 PM   #7 (permalink)
Chris Taylor
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I found the oil leak. It was leaking at the back of the intake where it joins the head.

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