Power steering pulley
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HT4100 4.1, 4.5, 4.9 Discussion, Power steering pulley in Cadillac Engine Technical Discussion; Alright, a while ago, I replaced my power steering pump due to a leak at the shaft seal and air ...
  1. #1
    drewsdeville's Avatar
    drewsdeville is offline Cadillac Owners Master
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    Power steering pulley

    Alright, a while ago, I replaced my power steering pump due to a leak at the shaft seal and air intrusion. Everything works great and cured my fluid-foaming problem at cold temps.

    However, when I replaced the pump, I noticed some thin, hairline cracks near the center of the pulley near the steel sleeve that gets pressed on to the pump shaft.

    A little while later, the pulley is makong noise now. Even with the car off, I can try to wiggle the pulley and can hear the plastic "creak". Obviously, I plan to replace this.

    Remembering from the other cars I've owned, the plastic power steering pulley was a 4.9 thing introduced in the '90's. However, the 4.1 and 4.5 have all steel power steering pulleys (I've confirmed this with my '90 4.5 and dads '89 4.5. I could replace the pulley with the correct plastic one, but, for piece of mind, I'd rather replace it with a steel pulley if the diameters are the same. Does anyone have any available info that confirms the interchangeability?

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    Dave S Texas's Avatar
    Dave S Texas is offline Cadillac Owners Enthusiast
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    Re: Power steering pulley

    A new one costs $20-$25 and should last as long as the OEM part did.
    I'd be comparing at the local 'recycle' yard or parts store.

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    drewsdeville's Avatar
    drewsdeville is offline Cadillac Owners Master
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    Re: Power steering pulley

    Yeah, I'm planning on heading out to the junkyard for a replacement either way. I just figured I'd see if anyone has experimented here before doing so myself.

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    ehall's Avatar
    ehall is offline Cadillac Owners Connoisseur
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    Re: Power steering pulley

    You're lucky, Dorman sells a replacement for your model. Okay it's plastic, buy two.

    I have a 4.1 and my pulley is warbled a little. Nobody makes a replacement for the pump on the 4.1. I bought a junkyard replacement and it was also bent. So I've been looking at pulleys from other vehicles and while I can get pretty close there is always something just different enough. One of the Jeep pulleys was really close (they use the same pump) but the offset was backwards since they run the belt behind the face instead of on top of it. From what I recall the other 4.x pulleys had completely different shafts. If you want to go on a similar quest, go to dormanproducts.com and find the power steering pulley PDF catalog, look up your part and write down the dimensions, then look at all of the other parts to find similar dimensions.

    Let us know if you find anything

  6. #5
    drewsdeville's Avatar
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    Re: Power steering pulley

    well, they are easily available at local parts stores and the junkyards around here. Availability isn't the problem. Just a matter of being able to switch to the steel one if I wanted to.

    I guess I will be the pioneer with this question. I'll take a micrometer to the junkyard, pull some pulleys and measure the shaft diameters. I'll let you guys know once I go out there.

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    ehall's Avatar
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    Re: Power steering pulley

    The junkyards around here won't sell the pulleys, they sell the pumps with the pulleys still attached. I have four pumps...

    If you find a 4.1 with a pulley still on it grab it for me?

  8. #7
    behind-bars is offline Cadillac Owners Connoisseur
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    Re: Power steering pulley

    Just FYI 4.9s in 93 had all steel pulleys on them also so you don't necessarily have to go back to a 4.5. Both my 4.9s are steel so I am pretty sure they are OEM.

    Mine is wearing out though, I have had to replace the PS pump 4 times now so the pulley has been removed and installed several times. This last time I had to run a washer and bolt through the pulley into the pump to keep it pressed on, otherwise the pulley would slide off and misalign the belt making the car un-driveable, just something you may want to keep in mind if you are going to be pulling junk yard parts.

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