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    Main Crankshaft Bearings - Use Oversized or Undersized Bearing

    Uploaded by

    Kiky Ichanafi
    bearing

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    Main Crankshaft Bearings - Use Oversized or Undersized Bearing

    Uploaded by

    Kiky Ichanafi
    120 views2 pages
    bearing

    Original Title

    Main Crankshaft Bearings_ Use Oversized or Undersized Bearing

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    © © All Rights Reserved

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    bearing

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    120 views2 pages

    Main Crankshaft Bearings - Use Oversized or Undersized Bearing

    Uploaded by

    Kiky Ichanafi
    bearing

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 2

    Main Crankshaft Bearings: Use Oversized or Undersized Bearing

    http://www.freeasestudyguides.com/crankshaft-bearing-inspection.html

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    Crankshaft Bearings
    Crankshaft bearings are made of a softer material than the crankshaft journal or cap
    they sit in. This insures that the bearing material wears before the journal. The
    crankshafts journal doesn't actually ride on the bearing surface, instead it rides on a thin
    film of oil between the journal and the bearings.
    If the crankshaft journals are worn, scored, or out of round, the gap between the two are
    affected. Whenever there is contact between the journal and the bearing there will be
    excessive wear.
    Check the bearing for metal particles embedded into its surface. This indicates that two
    metal parts are in contact with each other creating metal shavings. It's important to find
    and repair this problem before proceeding. Whenever you find metal shavings in the oil
    pan or bearings, the oil pump must also be inspected. Look at the backside of the bearing
    insert for wear indicting that it has spun in its saddle.
    Check the main bearing bore for misalignment. There are several methods to do so. Its
    easiest to use a straight edge and a feeler gauge. Use a blade half the thickness of the
    maximum clearance. The feeler gauge must not fit between the straightedge and the
    bores surface. Warpage can be corrected when it isn't too far out of specifications. The
    block can be line bored and oversized bearings installed.

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    31/08/2016 15:01

    Main Crankshaft Bearings: Use Oversized or Undersized Bearing

    http://www.freeasestudyguides.com/crankshaft-bearing-inspection.html

    Oversized or Undersized
    Bearings come standard, oversized, or undersized. This information is stamped on the back on the insert. An oversized bearing has the
    same material thickness on the inside of the bearing facing the crankshaft journal, and more material on the outside facing the bore. An
    oversized bearing is used after a block has been line bored. The opposite is true for an undersized bearing because it has more material on
    the inside facing the journal, and the same amount facing the bore it fits into. Undersized bearings are for a smaller diameter or machined
    crankshaft journal.

    2 dari 2

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    New or reconditioned slewing rings turning rings, slew pinions etc

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    31/08/2016 15:01

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