Water Pump Tasks ahead

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HT4100 4.1, 4.5, 4.9 Discussion, Water Pump Tasks ahead in Cadillac Engine Discussion; Question all. How hard is it to replace a water pump on the 4.5 Engine (89 Coupe)? What steps are ...
  1. #1
    88_Deville_Executive is offline Cadillac Owners Member
    Automobile(s): 1988 Cadillac Deville Executive
    Join Date
    Sep 2007
    Fairview, OR

    Water Pump Tasks ahead

    Question all.

    How hard is it to replace a water pump on the 4.5 Engine (89 Coupe)? What steps are involved and about how long does it take? Is it a "B**ch for lack of a better word. :-)

    I have done replacement before on a good ol' Lincoln V8, but this seems alittle more buried.

    Any info appreciated


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  3. #2
    HUF's Avatar
    HUF is offline Cadillac Owners Connoisseur
    Automobile(s): 1995 FWB 100,*** miles CURRENT. 1991 Seville 175,000 SOLD
    Join Date
    Dec 2005

    Re: Water Pump Tasks ahead

    There is a torx bolt on the water pump. It is probably the most hated by the 4.* owners bolt. LOL

  4. #3
    brougham is offline Cadillac Owners Master
    Automobile(s): 1991 Cadillac Brougham D'Elegance 5.7 Litre
    Join Date
    Jun 2003

    Re: Water Pump Tasks ahead

    For some reason I think theres 2 of them. I had to buy sockets to take those stupid things out.

  5. #4
    rootercycles is offline Cadillac Owners Member
    Automobile(s): 1985 Deville with 4.1
    Join Date
    Feb 2008

    Re: Water Pump Tasks ahead

    I replaced my water pump in my 4.1 this weekend. toughest job I have ever done on an engine. Have plenty of patience and beer on hand!

  6. #5
    cadillac_al is offline Cadillac Owners Connoisseur
    Automobile(s): Cadillac 78 Seville, 78 Coupe de Ville, 92 Sedan de Ville
    Join Date
    Feb 2007

    Re: Water Pump Tasks ahead

    I had to jack my engine up one inch to get some clearance. Some tech posted here a couple weeks ago that they unhook one or two motor mounts on every 4.x that they do and jack it up a few inches. I think that might have saved me some time and I may look into that if I have to do another one. Make sure you have the correct torx bit. A lot of people seem to strip them, but I don't see how because the bolt head is pretty stout. I assume someone at sometime used the wrong bit. Beer and patience are essential because it is a frustrating tedious task but very doable for the average mechanic.

  7. #6
    forrest is offline Cadillac Owners Member
    Automobile(s): 92 Seville
    Join Date
    Aug 2006
    So. Cal.

    Re: Water Pump Tasks ahead

    I need to do my 92 Seville water pump and figure I'll do the chain at the same time. Does anybody know the size of that torx. I tried to tighten them down when my pump was leaking and couldn't find one in my collection. I ended up just inserting the closest one I had and tilted it to where it got a little bit of a bite. It stopped leaking. I'll go buy one, if I know the size. The book doesn't say ... only the torque value.

  8. #7
    Edahall's Avatar
    Edahall is offline Cadillac Owners Enthusiast
    Automobile(s): 93 & 88 Allante, 88 Eldorado
    Join Date
    Jan 2004

    Re: Water Pump Tasks ahead

    I did this job in a walmart parking lot on my 88 Eldorado. I was lucky that day since I had a spare water pump in the trunk. It took me about 2 hours start to finish and that included buying antifreeze and water to fill up the radiator. The hardest part is removing that torx screws and yes, space is very tight.

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