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  1. #1
    thompsdw's Avatar
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    Diagnose Pump Problem

    Have you guys ever seen a pump where the bearings are really tight (almost feel new), but the shaft appears to be off center in the pump. What I am seeing is wear on the bottom side of the wear ring and the top side looks fine. I haven't put feeler gauges to it yet, but the top still feels pretty tight. It almost looks like a manufacturing defect, but who knows.

    Has anyone seen anything like this before?


  2. #2
    Kiwi spanner handler
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    does the shaft look off centre of you just think it is due to the wear? its fairly common to have a spot that wears without touching anywhere else it can be due to manufacturing off centre slightly or can be the wear ring so a new ring may wear differently or not at all and sometimes poor alignment of the engine can cause it.

  3. #3
    thompsdw's Avatar
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    I can't tell if it is off center, but if it is you don't notice it. I put a new wear ring in the pump recently. The previous wear ring was worn the same way. I have seen a little rub, but never anything quite this significant. Here is a picture (I did try to sand the area smooth last night) ......
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  4. #4
    King_Of_Fun's Avatar
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    Is this a plastic or metal pump? Did you use screws to lock the wear ring? If so, the screws may have pushed the wear ring in towards the shaft slightly... Ron

  5. #5
    according to his years listed, they all should have plastic pumps, and that would be my first question, anti-spin screws?

  6. #6
    King_Of_Fun's Avatar
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    If it has the screws, they may not have seated the wear ring properly. I put a metal pump in my '03 and it doesn't have the screws like the plastic pump had... Ron

  7. #7
    thompsdw's Avatar
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    It is a plastic pump, however, the set screws are on the opposite site of the pump. The previous wear ring was worn the same way (actually more dramatically). I think it is a manufacturing defect, but looking to hear others opinion. The bearings are very tight ..........

  8. #8
    thompsdw's Avatar
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    Here is the set screw side. Note the point of minor impact. It was hell trying to get the screws to pin the ring without deflecting the wear ring. I don't think that is it though .............
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  9. #9
    King_Of_Fun's Avatar
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    If the wear ring is wearing at spots 180 degrees, it's definately flexing. That's how I got the aluminum pump under warranty. PPG did it where my local dealer had no clue... Ron

  10. #10
    thompsdw's Avatar
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    On the side near the rub the clearance is now 0.004" and on the opposite side the clearance is 0.010". 6 thousandths seems like a little much to be off. Any ideas on what to do?

    Could the shaft be somehow installed at an angle (bearing cocked)?

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