1. Examine the cylinder block for cracks. Replace, if damaged.
2. Examine the cylinder bores for scratches, scoring and pitting. Check the cylinder bores for out-of-round or taper. If out-of-round more than 0.013 mm (.0005 in), or tapered more than 0.025 mm (.0010 in) from top to bottom of bore, or scratched, scored, or pitted, the cylinder block must be re-bored or honed oversize, or replaced with a new cylinder block. Service pistons are available at 0.25 mm (.010 in) and 0.50 mm (.020 in) oversize.