Piston: Testing and Inspection

Block and Piston Inspection
1. Remove the crankshaft and the pistons.
2. Check the piston for distortion or cracks.
3. Measure the piston diameter (A) at a point 13 mm (0.5 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 is 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 engine block for excessive wear.