Oil pump shaft radial play

Discussion in 'Street/strip 400/430/455' started by Electra Sweden, Mar 18, 2023 at 3:33 PM.

  1. Electra Sweden

    Electra Sweden Well-Known Member

    There is a lot of information on the axial clearance on the oil pump gears. However, I have found none on the radial shaft clearance ("side-to-side"). Nothing in the Chassis Service Manual. Reason I am asking is because I can clearly feel the shaft moving side to side, even now when oiled. Considering how bushings this size usually are setup, I see no reason why this shaft should have more than 0.001"-0015" radial play?

    Seems like a tricky machining operation to drill the passage out and install bushings. I suppose running a reamer in reverse like some people do with throttle shaft bushings might be an idea but.... A bit disappointed Buick didn't put bushings in it. Guess I am reaching out as a last resort for input before ordering a timing chain covers.
  2. Mart

    Mart Gold level member

    I would think too much slop or play would result in wear all down the line, gears, oil pump pocket & cover. Set clearances tight on pump cover and that unwanted shaft play will allow gear to score cover surface.
  3. Stevem

    Stevem Well-Known Member

    How much play are we talking about?
    A sheet of note book paper is like .004”, can you rap a strip of that around the shaft and get it to drop into the pump?
  4. Schurkey

    Schurkey Silver Level contributor

    HOW are you measuring shaft radial play? Photos would be welcome.
  5. Bigpig455

    Bigpig455 Fastest of the slow....

    Off the cuff, I wouldnt expect more than .002-.004 - maybe toward the latter given the disparate heat expansion rates of steel and aluminum.

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