The InFamous N* Oil Leak - Oil Manifold
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Northstar Engines and System Technical Discussion Discussion, The InFamous N* Oil Leak - Oil Manifold in Cadillac Engine Technical Discussion; What did the factory do to solve this? When did they do this? What is then difference of factory solving ...
  1. #1
    MachoDemon is offline Cadillac Owners Member
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    The InFamous N* Oil Leak - Oil Manifold

    What did the factory do to solve this?

    When did they do this?

    What is then difference of factory solving
    compared to early warranty repairrings
    on 1993-1994s

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    MoistCabbage's Avatar
    MoistCabbage is online now Cadillac Owners 10000+ Posts
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    What infamous oil leak? Oil manifold?

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    Submariner409's Avatar
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    Re: The InFamous N* Oil Leak - Oil Manifold

    Sweden - Something lost in the translation here .............. Are we talking about the oil filter adapter, the lower halfcase, or the internal oil distribution plate (manifold).

    Oil distribution plate - and it requires complete engine removal and disassembly.......... AND GM says "Use a new one every time.".

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    MachoDemon is offline Cadillac Owners Member
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    Re: The InFamous N* Oil Leak - Oil Manifold

    The InFamous N* oil leak in the oil manifold is in the upper part of
    the plate between oil pan and the crankcase - thought everyone here
    knew this. And the leak is on the upper part of this plate - why this
    is a bad contruction from the beginning I don't know.

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    Re: The InFamous N* Oil Leak - Oil Manifold

    There is a revised procedure to reseal with current distribution plate........

    ----------

    http://www.cadillacforums.com/forums...northstar.html

    Post #23 on.....

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    MachoDemon is offline Cadillac Owners Member
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    Re: The InFamous N* Oil Leak - Oil Manifold

    But how did the factory solve this in the production and when?

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    Submariner409's Avatar
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    Re: The InFamous N* Oil Leak - Oil Manifold

    I don't believe that GM "solved" the potential problem during the production run - up to at least ? 2004 ? - after that, a TSB (Technical Service Bulletin) was issued outlining new oil pan and halfcase re-seal procedures using the then-new GM Gray RTV sealant - Permatex UltraGray.

    I think that Jake or Evrett at NorthstarPerformance have quite a bit of insight here - they were involved in remaining stock purchase at the closing of the Livonia engine assembly plant. Many posts and pictures on this a few years ago.

    Very specific seal procedures without using the original silicone seals. The new oil distribution manifold incorporates a new seal.

    ........... and it's not an infamous leak because many - the majority - Northstars do not have halfcase or oil pan seam leaks.

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    Re: The InFamous N* Oil Leak - Oil Manifold

    All Northstars will have oil leaks at a certain point in time. It's inevitable. In 04 they really screwed up and stopped machining the half case seal groove right up to the rear main seal area... there's about 3/8" of area without any seal. I'm surprised they don't leak more.

    Essentially there are certain things you can do to extend the time before seepage will occur from a total re-seal. It involves careful surface preparation and the use of both rubber seals and RTV.

    Sub you're close, but it's not Permatex Ultra Grey to my knowledge. the GM sealant is quite a bit thicker (if you don't have a pneumatic/electric sealant gun it sure gives your arm muslces a workout squeezing the trigger).

    I will catch up a bit more tomorrow with all of this.

  10. #9
    MachoDemon is offline Cadillac Owners Member
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    Re: The InFamous N* Oil Leak - Oil Manifold

    I had my (allante 1993 which leaked when I bought it with 67,000 milage
    and 6 years of age) Engine out and resealed (and heads done) at slightly
    more than 100,000 milage - I didn't have the manifold plate changed but
    resealed with black loctite Quick gasket - the original o-ring gasket was
    not broken or something - leak was because of flatness - so it was kept
    and resealing was made all around and outside this o-ring gasket.

    http://www.ebay.co.uk/itm/Loctite-Qu...-/261069311104

    I Think it is this one - hope it will solve the oil leak for the rest of my car's Life.

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