Engine Block and Piston Inspection
  1. Check the piston for distortion or cracks.
  1. Measure the piston diameter at a point 14 mm (0.55 in.) from the bottom of the skirt.
    Piston Skirt Diameter
    Standard (New):
    80.980−80.990 mm (3.1881−3.1886 in.)
    Service Limit:
    80.93 mm (3.186 in.)


    Oversize Piston Skirt Diameter
    0.25:
    81.230−81.240 mm (3.1980−3.1984 in.)

  1. Measure the wear and taper in direction Y at three levels inside each cylinder as shown. If the measurements in any cylinder are beyond the Oversize Bore Service Limit, replace the engine block. If the engine block is being rebored, refer to Step 7 after reboring.
    Cylinder Bore Size
    Standard (New):
    81.000−81.015 mm (3.1890−3.1896 in.)
    Service Limit:
    81.070 mm (3.1917 in.)

    Oversize
    0.25:
    81.250−81.265 mm (3.1988−3.1994 in.)

    Reboring limit:
    0.25 mm (0.01 in.) max.

    Bore Taper
    Limit (Difference between first and third measurement):
    0.05 mm (0.002 in.)

  1. Scored or scratched cylinder bores must be honed.
  1. Check the top of the engine block for warpage. Measure along the edges and across the center as shown.

    Engine Block Warpage

    Standard (New):
    0.07 mm (0.003 in.) max.
    Service Limit:
    0.10 mm (0.004 in.)

  1. Calculate the difference between the cylinder bore diameter and the piston diameter. If the clearance is near, or exceeds the service limit, inspect the piston and the engine block for excessive wear.

    Piston-to-Cylinder Bore Clearance

    Standard (New):
    0.010−0.035 mm (0.0004−0.0014 in.)
    Service Limit:
    0.05 mm (0.002 in.)