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Cylinder Bore Taper

    NOTE: The main bearing caps or lower crankcase must be in place and tightened to the specified torque; however, the bearing shells should not be installed.
  1. Measure the cylinder bore with an internal micrometer.
    • Carry out the measurements in different directions and at different heights to determine if there is any out-of-roundness or tapering.
    • If the measurement is out of the specified range, install a new block or hone out the cylinder block (if aplicable/allowed).
      Fig 1: Measuring Cylinder Bore
      G03431590Courtesy of FORD MOTOR CO.
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