472 waterpump/serpentine belt problem
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500, 472, 425, 368 Discussion, 472 waterpump/serpentine belt problem in Cadillac Engine Technical Discussion; I went out today to finish up the belts/hoses and fan after changing the water pump when I realized that ...
  1. #1
    SpecialFX is offline Cadillac Owners Member
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    472 waterpump/serpentine belt problem

    I went out today to finish up the belts/hoses and fan after changing the water pump when I realized that the back serpentine belt is rubbing the housing on the water pump. It seems to not rub alot, but it's concerning me. Is there an adjustment on any of the pulleys (maybe AC condenser?) that can move this belt out at all? Or do I need to grind down the water pump housing? Or will it not really hurt anything? The housing on the old water pump seems a little darkened on that portion, too. So maybe it was hitting also? Please advise!

    Sorry for being blurry, but you get the point.

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    limousine rider's Avatar
    limousine rider is offline Cadillac Owners Member
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    Re: 472 waterpump/serpentine belt problem

    by the looks of things ied say the worst thing would be it wearing down the belt a bit other then that you should be fine, the best part about that pully system is there is 2 belts incase the one rubing snaps so you will always be safe.

  4. #3
    SpecialFX is offline Cadillac Owners Member
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    Re: 472 waterpump/serpentine belt problem

    anyone know if there is a non A/C belt? I have clearance if I don't go to the A/C compressor. The A/C doesn't work anyway. I dremeled the water pump housing as much as I feel comfortable with, so it will rub slightly less and it's now smooth instead of rough casting. I think I might just try it and see how it goes. Still interested in a non-A/C belt if there exists one though.

  5. #4
    JTraik is offline Cadillac Owners Enthusiast
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    Re: 472 waterpump/serpentine belt problem

    Quote Originally Posted by SpecialFX View Post
    anyone know if there is a non A/C belt? I have clearance if I don't go to the A/C compressor. The A/C doesn't work anyway. I dremeled the water pump housing as much as I feel comfortable with, so it will rub slightly less and it's now smooth instead of rough casting. I think I might just try it and see how it goes. Still interested in a non-A/C belt if there exists one though.
    Believe it or not these cars did NOT come standard with A/C however I have never seen one without it. The belts are out there but probably arent too popular. One of your best bets would go to www.usapartssupply.com and check out what belts they have, im not too sure but I am guessing the belt for non-A/C is some standard size they have down at the store, not certain on that thouhg.

    It is very odd that the belt is rubbing on the casting like that, it was probably just a bad mold or something at the factory... if it is a reman pump and was casted bad, it would have smooth rub marks from the previous engine, I would take a gander at your compressor to make sure the thing isnt all cockeyed in there... even if you dont use it. I do believe however that the compressor can be slid around

  6. #5
    SpecialFX is offline Cadillac Owners Member
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    Re: 472 waterpump/serpentine belt problem

    Quote Originally Posted by JTraik View Post
    Believe it or not these cars did NOT come standard with A/C however I have never seen one without it. The belts are out there but probably arent too popular. One of your best bets would go to www.usapartssupply.com and check out what belts they have, im not too sure but I am guessing the belt for non-A/C is some standard size they have down at the store, not certain on that thouhg.

    It is very odd that the belt is rubbing on the casting like that, it was probably just a bad mold or something at the factory... if it is a reman pump and was casted bad, it would have smooth rub marks from the previous engine, I would take a gander at your compressor to make sure the thing isnt all cockeyed in there... even if you dont use it. I do believe however that the compressor can be slid around

    I'll double check but the compressor already seems to be moved to the furthest it can go in the direction it would need to go. And the pump is new. It was only like $15 more for new.

    And as far as the belt USA Parts Supply doesn't show it in teh their caddy catalog they sent me.

  7. #6
    jk1000 is offline Cadillac Owners Member
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    Re: 472 waterpump/serpentine belt problem

    So I assume the old pump didn't rub. If I'm correct, then the problem must be the new pump, as already mentioned. I remember in the original stock setup, the belt was close, perhaps a quarter of an inch, but never touching.

  8. #7
    cadillacmike68's Avatar
    cadillacmike68 is offline Cadillac Owners Connoisseur
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    Re: 472 waterpump/serpentine belt problem

    These cars took 48 or 48.5" belts without Climate Control. I carry a set with my 68 DVC in case the compressor pulley seizes. This has happened more than once in my experience with these cars! Unless you live way up north, you'd be better off getting your Climate Control fixed. you'll enjoy your car a lot more.

    That's a loooong stretch up from the crank pulley to the compressor. If the belts aren't tight, they'll "wobble" and can touch the pump housing.

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