Piston: Testing and Inspection
Block and Piston Inspection1. Remove the pistons from the engine block.
2. Check the pistons for distortion or cracks.
3. Measure the piston diameter at a point 16.0 mm (0.63 in.) from the bottom of the skirt.
4. Measure the wear and taper in direction X and 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 has to be rebored, refer to step 7 after reboring.
5. Hone any scored or scratched cylinder bores.
6. Check the top of the engine block for warpage. Measure along the edges and across the center as shown.
7. 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 cylinder bore for excessive wear.
