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Crankshaft Main Bearing Journal Diameter

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  1. Clean the crankshaft with a suitable solvent. Dry with compressed air.
  2. Use a stiff nylon brush to clean all internal oil passages of the crankshaft. Loosen all accumulated dirt, sludge and deposits. Flush oil passages with a suitable solvent.
  3. Inspect crankshaft journals for scratches, grooves and scoring.
  4. Inspect crankshaft main bearings for scratches, grooves, scoring, pitting and inconsistent coloring.
  5. Use a 75-100 mm (3-4 in) micrometer to measure the diameter of each journal. Measure each journal at 2 points, 90 degrees apart. Move the micrometer over the entire width of the journal. For additional information, refer to SPECIFICATIONS .
    Fig 1: Measuring Crankshaft Main Bearing Journal Diameter Using Micrometer
    G08593074Courtesy of FORD MOTOR CO.
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