Pistons

Inspection

1. Check the piston for distortion or cracks.

NOTE: If cylinder is bored, an oversized piston must be used.

2. Measure piston diameter at a point A from bottom of skirt.

A: 15 mm (0.6 in)

Piston Diameter:

Standard (New): 74.980-74.990 mm (2.9520-2.9524 in) Service Limit:   74.970 mm (2.9516 in)

3. Calculate difference between cylinder bore diameter (see page 7-12) and piston diameter.

Piston-to-Cylinder Clearance Standard (New): 0.010-0.040 mm 0.0004-0.0016 in) Service Limit: 0.05 mm (0.002 in)

If the clearance is near or exceeds the service limit, inspect the piston and cylinder block for excessive wear.

Oversize Piston Diameter

0.25: 75.23-75.24 mm (2.9618-2.9622 in) 0.50: 75.48-75.49 mm (2.9716-2.9720 in)