Engine Block and Piston Inspection
  1. Remove the crankshaft and pistons.
  1. Check the piston for distortion or cracks.
  1. Measure the piston diameter at a point 14 mm (0.6 in.) from the bottom of the skirt. There are two standard-size pistons (A and B). The letter is stamped on the top of the piston. Letters are also stamped on the engine block as cylinder bore sizes.

    Piston Diameter

    Standard (New):
    A:
    84.950−84.980 mm (3.3445−3.3457 in.)
    B:
    84.940−84.970 mm (3.3441−3.3453 in.)
    Service Limit:
    A:
    84.920 mm (3.3433 in.)
    B:
    84.910 mm (3.3429 in.)


    Oversize Piston Diameter
    0.25:
    85.20−85.23 mm (3.354−3.356 in.)