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Thread: G63B Oil Pump Sprocket and DNJ OP105-Part Numbers

  1. #1

    Array
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    03-26-2015
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    29
    Location

    Hawthorne, FL
    Vehicle

    1987 Dodge Ram 50
    Engine

    G63B

    G63B Oil Pump Sprocket and DNJ OP105-Part Numbers

    [top]DNJ OP 105 OPump and Stock Oil Pump Sprocket Oversize-Sprocket Replacement

    Have a new DNJ Oil Pump (OP105) for my 1987 G63b. When I fit the stock Oil Pump Sprocket I have two issues needing advise on.
    1) The key flat on the sprocket is only at the lip and does not extend the depth of the sprocket. Looked at new 4G63 sprockets and it does not appear to have a flat inside the inside the bore to engage the shaft. Recommendations? No flat? Then what engages and turns the shaft? Do I need a replacement?

    2) the OD of the Oil Pump Shaft and ID of the old Oil Pump Sprocket is a few hundreth off, so much that the sprocket can off center and spin freely without engaging the shaft? What are the tolerances between shaft and ID of the sprocket?

    Seems to me both issues rule out using the original Oil Pump Sprocket? Anyone run into DNJ Oil Pump Shaft not being to specs? Is there a DNJ Oil Pump Sprocket? Is is mine just shot and a replacement will mate up with the DNJ Pump Shaft?


    Part Number for Oil Pump Sprocket? G63b? 4G63?

    I hear the 4g63 sprockets and the G63b sprockets (with the exeption of the the Cam Sprocket) are interchangeable? Can anyone confirm?


  2. #2

    Array
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    Offline
    Join Date
    11-08-2015
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    9
    Location

    United States
    Vehicle

    1988 Mitsubishi Mighty Max
    Engine

    G63B
    Did you ever figure this out? Just got my dnj oil pump from the machine shop today. Trying to make sure its a good part to use on my engine.

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