Block and Piston 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 16 mm (0.6 in.) 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. 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 the cylinder bore diameter and the piston diameter. If the clearance is near or exceeds the service limit, inspect the piston and engine block for excessive wear.