STS now in for...sigh...headgaskets...
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Cadillac Seville / Cadillac Eldorado Forum Discussion, STS now in for...sigh...headgaskets... in Past Cadillac Vehicle Discussion; With all the work I had done to this car before, now the head gaskets go after another 18k miles....I ...
  1. #1
    the recluse is offline Cadillac Owners Connoisseur
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    STS now in for...sigh...headgaskets...

    With all the work I had done to this car before, now the head gaskets go after another 18k miles....I guess 176,000 miles isn't sooo bad...just aggravating.

    Found a replacement engine for the car....only has 6,000 miles on it. Yeah, you read that right, 6,000 miles on it.

    A guy I know had bought it out of a wrecked 2000 DTS back in like 2001 or 2002.

    He sealed every conceivable opening and wrapped it in shrink wrap.

    This is what it looked like when it showed up, unwrapped of course...



    I feared the block seal may have dried out (a little seeping at the seam) and didn't want to take the chance that it would leak in the car, so I split it and am resealing the block.

    Check out these pics:

    Overall:



    Bearing journals:





    Cylinder bores:



    I'm loving this find....not bad for an engine that has been sitting for over a decade...

    Next comes the rather tedious task of taking the motor out of the top because I 1) don't have a lift and 2) don't want to redo the front end work...

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  3. #2
    orconn's Avatar
    orconn is online now Cadillac Owners 10000+ Posts
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    Re: STS now in for...sigh...headgaskets...

    I wish you well! Keep us posted.

  4. #3
    maeng9981's Avatar
    maeng9981 is offline Cadillac Owners Connoisseur
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    Re: STS now in for...sigh...headgaskets...

    That engine looks really clean!

  5. #4
    Submariner409's Avatar
    Submariner409 is offline If it won't run, stick on fender vents
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    Re: STS now in for...sigh...headgaskets...

    You have your hands full, Chris. Good luck !!!

    DTS to STS = some cooling system piping work.

  6. #5
    the recluse is offline Cadillac Owners Connoisseur
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    Re: STS now in for...sigh...headgaskets...

    Jim, basically everything is coming off the STS and being bolted to this DTS block, the only cooling piping that I can see is maybe the water pump crossover, but that's being removed too...
    any other thoughts/surprises that I might be in for?

  7. #6
    the recluse is offline Cadillac Owners Connoisseur
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    Re: STS now in for...sigh...headgaskets...

    found the plumbing snafu...the EGR system isn't plugged into the DTS exhaust manifolds...odd, buit no big deal, just swapping manifolds...

  8. #7
    curtc's Avatar
    curtc is offline OCD - Obsessive Cadillac Disorder
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    Re: STS now in for...sigh...headgaskets...

    Are you planning on studding the head on this one to save you another HG surprise??? I would highly recommend it since it's already out of the car...
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  9. #8
    the recluse is offline Cadillac Owners Connoisseur
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    Re: STS now in for...sigh...headgaskets...

    don't have the cash for that right now, but I'll have another Northstar as soon as it comes out...

  10. #9
    stoveguyy is offline Cadillac Owners Connoisseur
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    Back in the day, northstar headgaskets never failed at 1yr/10k miles? We would need a time machine to go back to 1999 and take a poll of how common it was for 1yr old cars to have warranty issues on heads?

  11. #10
    vincentm's Avatar
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    Re: STS now in for...sigh...headgaskets...

    Quote Originally Posted by the recluse View Post
    don't have the cash for that right now, but I'll have another Northstar as soon as it comes out...

    Id really hate to see it leak or have a HG failure, id strongly recommend studding while it's out. If i could help you obtain a set of studs, i would.

  12. #11
    stoveguyy is offline Cadillac Owners Connoisseur
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    You have a very low miles motor which should be good but could be improved with studs

  13. #12
    the recluse is offline Cadillac Owners Connoisseur
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    Re: STS now in for...sigh...headgaskets...

    Quote Originally Posted by vincentm View Post
    Id really hate to see it leak or have a HG failure, id strongly recommend studding while it's out. If i could help you obtain a set of studs, i would.
    The problem I have is with a new motor, I'm afraid the trans is on the chopping block next....I'm trying to save up to get that gone through, otherwise I fear I won't have to worry about the HG's...

    My last motor went 175K+ before it let go. Even if this one only gets me to 130K, that's still about 4 1/2 years out at the rate I drive and when I get my wife's car done, this car will sit it out and hardly get any miles on it....

    ----------

    Now, for those who have pulled this motor out from the top, I bow to your abilities....I tried, but I failed and decided to pull the thing out the bottom...

  14. #13
    the recluse is offline Cadillac Owners Connoisseur
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    Re: STS now in for...sigh...headgaskets...

    Here is the difference between the two manifolds. You'll notice the EGR "bib" sprouting out past the manifold flange...


  15. #14
    the recluse is offline Cadillac Owners Connoisseur
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    Re: STS now in for...sigh...headgaskets...

    Now it's been awhile (don't ask why, it's depressing enough), but I finally got back to putting the Northstar back together...

    One thing I noticed, and was not particularly fond of, is the amount of restriction in these exhaust manifolds. They're welded together and where they started wraps around to the point where they ended and overlapped to this big blob of weld...



    Now they're hard to see through the carbon build up, but it's thick, tall, and bottle necks the flow, so I trimmed the weld a little with a dremel...



    I did them all. Don't know if it'll be of any real benefit, but...it's done anyway, lol

  16. #15
    Submariner409's Avatar
    Submariner409 is offline If it won't run, stick on fender vents
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    Re: STS now in for...sigh...headgaskets...

    Did you Dremel the collector Y ?? The left bank(front) pipe is usually stuck into the larger right bank(rear) pipe and welded - leaving a lot of pipe protruding into the Y. Pictures in the Northstar files a year or so back.

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