Piston: Testing and Inspection

Block and Piston Inspection
1. Remove the piston from the engine block.
2. Check the piston for distortion or cracks.





3. Measure the piston diameter at a point 16.0 mm (0.63 inch) from the bottom of the skirt.





4. Measure 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. Scored or scratched cylinder bores must be honed.





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