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Oil pump install.

Discussion in '"Stock" Alpine' started by Jimjordan2, Nov 12, 2015.

  1. Jimjordan2

    Jimjordan2 Gold Level Sponsor

    Just checking in before I screw this up. Installing my new oil pump, know it's supposed to be positioned at about a 45 deg angle, but tdc for #1 piston, should this be just after the [intake valve closes and piston is at top? I think that's right. Gears are lined up point to point. I know, simple question, probably a simple answer.
  2. RootesRacer

    RootesRacer Donation Time

    #1 TDC occurs when both valves are and have been fully closed for some time.

    If you find TDC when the exhaust is about closed and the intake is just opening, turn the engine 1 more turn becuase #1 TDC is at the end of the compression and beginning of the power stroke.

    Hope that makes sense.
  3. Tom H

    Tom H Platinum Level Sponsor

    Jim, Very common confusion. Rootes is correct. When the dots on the cam gears are lined up you are one crank rotation off for oil pump install.

    And it's not just 45 deg, but 45 deg with the "HEAVY SIDE of the shaft" toward the block. The slot in the shaft for the dizzy drive is slightly off center. Almost impossible to see. Some have found it helpful to paint the end of the shaft white. Also helpful may be to put a Q-tip shaft across the slot as a visual aid.

    Se pic in post #1 here:


    This is in WRONG!. YOU can see that the segment of the shaft in the upper left area is slightly smaller than the portion in the lower right, That is 180 out of position (assuming the crank is at the correct position!)

    Last edited: Nov 12, 2015
  4. jumpinjan

    jumpinjan Gold Level Sponsor

    I always double check the oil pump's slot offset by fitting a distributor to it. And checking the rotor is pointing to #1 firing, just like in the WSM.
  5. Jimjordan2

    Jimjordan2 Gold Level Sponsor

    Excellent information, and that older thread really helps. Guess I could have searched for that thread, but didn't even think about it. Duh......
    Thanks to all. Painting the "heavy" side is a great idea.

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