Question about 1995 Chevrolet Lumina

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My lumina 3.4 has been leaking oil. Ive had a mechanic tell me that it was coming from the area of the intake gasket. I researched and found out that gm motors 3.1 and 3.4 are prone to this and not even a lil. But all of the blogs i read consisted of coolant leaking. I dont seem to have that problem, just oil. Could this really be my problem?

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  • Tyrell Anderson Jul 16, 2009

    ok are you certain? and i think you may be right because when i had the car siting with it running at the shop i noticed that oil was kinda gushing out the bottom, maybe caused by pressure from the pump or something? doesnt happen like that often if ever.

  • Tyrell Anderson Jul 20, 2009

    ok soo i was hoping that was the case. I just left aamaco and they say there is oil everywhere under there. They say rear main seal, and oil pan right now. Didnt do a complete inspection yet. Could they be wrong?



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The o-ring on your oil pump drive has failed. any mechanic who knows ANYTHING about the 3.1 and 3.4 liter engine could have told you this

Posted on Jul 14, 2009

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The "O"-rings on the dummy distributor fail and allow oil to gush out the topside. It's the 30mm plug you see in the top of the block under the intake throttle body. Removing it (it is retained with a bolt and a fork)and replacing the o-rings will stop the leak. Since it drives the oil pump, it is keyed therefore you may need to bump the starter to get it to fall back in when you replace it.

Posted on Jul 19, 2009

  • Bruce Volkers
    Bruce Volkers Jul 20, 2009

    I suspect they have missed the mark.

    If the "O" rings aren't the leak now they soon will be. When they leak
    the oil runs down the block/bellhousing and drips from the same place
    that the rear main seal would drip. And of course the oil gets
    everywhere on the way down.

    You should be able to do the job yourself with only some basic tools.
    Remove the oil pump drive, it's round and made of aluminum and right
    where a distributor would be if it had one. Take the drive to the parts
    store and match up new "O"rings. The "O" rings should be less than
    $5.00 which is about 1% of what Aamco wants not to fix it.

    Let us know how it turns out.



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On the 3.4 dual overhead cam motor, you can't remove the plug. instead you get the plug up a 1/4 inch, which is all it will move without pulling the rear cylinder head, and stretch an o ring over it

Posted on Dec 07, 2013

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