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Engine Block and Piston Inspection

  1. Check the piston for distortion or cracks.
  1. Measure the piston diameter (A) at a point 16 mm (0.6 in.) from the bottom of the skirt.
    Piston Diameter
    L15A8 engine:
    Standard (New):
    72.980−72.990 mm (2.8732−2.8736 in.)
    Service Limit:
    72.97 mm (2.8728 in.)
    L13Z3 engine:
    Standard (New):
    72.972−72.982 mm (2.8729−2.8733 in.)
    Service Limit:
    72.97 mm (2.8728 in.)

    Oversize Piston Diameter
    L15A8 engine:
    0.25:
    73.230−73.240 mm (2.88307−2.88346 in.)
    L13Z3 engine:
    0.25:
    73.222−73.232 mm (2.88275−2.88314 in.)


  1. Measure wear and taper in direction Y at three levels in each cylinder as shown. If measurements in any cylinder are beyond the Oversize Bore Service Limit, replace the engine block. If the engine block is to be rebored, refer to Step 7 after reboring.

    Cylinder Bore Size

    Standard (New):
    73.000−73.015 mm (2.8740−2.8746 in.)
    Service Limit:
    73.065 mm (2.8766 in.)

    Oversize
    0.25:
    73.250−73.265 mm (2.8839−2.8844 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 engine block for excessive wear.

    Piston-to-Cylinder Clearance

    L15A8 engine:
    Standard (New):
    0.010−0.035 mm (0.0004−0.0014 in.)
    Service Limit:
    0.05 mm (0.002 in.)
    L13Z3 engine:
    Standard (New):
    0.018−0.043 mm (0.0007−0.0017 in.)
    Service Limit:
    0.05 mm (0.002 in.)