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Thread: 92 Eldorado water pump replacement

  1. #1
    Tdoriot is offline Cadillac Owners Member
    Automobile(s): 93 Eldorado ETC
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    92 Eldorado water pump replacement

    Hi Guys, I've read every posting I could find about the water pump. This is the first time I've yanked this type engine apart. Obviously the new pump comes with a perimeter gasket. The micheal mouse part of this assembly seems to be that the pump is a three piece affair. It seems that there is sub plate, and another plate behind that. Is there a gasket that goes between the second and third plate? And without yanking the harmonic balancer and taking that plate off, how is it effectively replaces to assure a leak free installation? This seems poorly engineered.
    I've owned the car 6 years or so and have encountered the low coolant/overheatin issue. The leak seemed to be coming between the second and third plate. Let's hope it isn't the head gasket fiasco !


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  3. #2
    basscatt's Avatar
    basscatt is offline Cadillac Owners 10000+ Posts
    Automobile(s): 2003 DHS - two-2002 DHS's, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
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    Re: 92 Eldorado water pump replacement

    my first suggestion would be to get the Factory Service Manual -

    chiltons and haynes just don't cut it - except for the very basics -

    here is one for less than $24 with shipping -
    http://www.ebay.com/itm/1992-CADILLA...3e299c&vxp=mtr

    if you need one that looks like brand new - $26 get you this one -
    http://www.ebay.com/itm/Cadillac-Ser...ef7817&vxp=mtr
    ---------------------------

    the 4.9 motor has iron heads -
    and does not suffer head gasket problems like the Northstar motor -

    there is a ton of information in the 4.9 engine forum - here -
    http://www.cadillacforums.com/forums/ht4100-4-1-4-5-4/

    also check out the TechTips forum - here -
    http://www.cadillacforums.com/forums...lac-tech-tips/

    and there were a lot more Devilles with the 4.9 motor than Eldos -
    you might find some useful information here -
    http://cadillacforums.com/forums/cad...ncluding-1985/

  4. #3
    amunderdog is offline Cadillac Owners Connoisseur
    Automobile(s): 1994 SLS x 2 ---- 1993 Eldorado Sport ----- 1994 Deville 4.9
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    Re: 92 Eldorado water pump replacement

    You are working on the 4.9
    They supply a paper gasket that fails.
    Get a good gasket and a water pump if you like.
    See if that fixes it.

    I did an outline of a write up with pictures.
    Then my PC died; so that is all lost.
    It is not a hard job.
    There are a lot of fasteners
    Can not find my notes now ether

  5. #4
    Tdoriot is offline Cadillac Owners Member
    Automobile(s): 93 Eldorado ETC
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    Re: 92 Eldorado water pump replacement

    Thanks for the encouraging info. Fortunately the pump came off with no bolt issues. Twice ! Tomorrow they are going to put it back together. I am having them put the pump in, hook up the hoses fill with water then pressure test and listen and look for leaks. If we have a leak in that goofy back plate, at least we don't have to rip everything else out. If it leaks, it's off with the harmonic balancer and removing that plate for cleaning and new gasket. I was under the impression that the 4.9 was as bad as the N*. I'm glad that although not impossible, the head gasket issue may not be an issue here. I'll report back when it's done.

  6. #5
    brougham is offline Cadillac Owners Master
    Automobile(s): 1991 Cadillac Brougham D'Elegance 5.7 Litre, 1994 DeVille
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    Re: 92 Eldorado water pump replacement

    The water pump is the black part that you can see on the outside of the engine. The plates behind it are something else. Usually the leak is at the water pump.

  7. #6
    drewsdeville is offline Cadillac Owners Master
    Automobile(s): 2011 Crown Vic LX, 2009 Chevy Malibu 2LT
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    Re: 92 Eldorado water pump replacement

    The "plates' behind the wp are the timing cover and water inlet. The water pump seals to the timing cover with a paper gasket, and the inlet seals to the back of the timing cover with the same paper type gasket. That said, at 20+ years old, I recommend that you replace all of the gaskets in this assembly whether they are all leaking or not... if the wp gasket has leaked, why would the inlet gasket be in any better shape???

  8. #7
    Join Date
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    A few years ago I owned an '88 eldo with the 4.5 engine. Couple years after replacing the water pump a leak developed at the timing cover plate. The chain also had a lot of slack after 95k miles, so I had that replaced too.

    I would recommend that you replaxe the timing chain and the timing gear cover gasket while you're in there. At a minimum check the timing chain over and replace the cover gasket.


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