Block and Piston Inspection

Block and Piston Inspection
1. Remove the piston from the cylinder 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 directions X and Y at three levels in each cylinder as shown.
If the measurements in any cylinder are beyond the oversize bore service limit, replace the cylinder block. If the block is to be rebored, refer to Piston Clearance Inspection (Go to step 6) after reboring.
Oversize
0.25: 89.250 - 89.265 mm (3.5138 - 3.5144 inch)
0.50: 89.500 - 89.515 mm (3.5236 - 3.5242 inch)
Reboring Limit: 0.5 mm (0.02 inch)
Bore Taper Limit: (Difference between first and third measurement) 0.05 mm (0.002 inch)
5. Scored or scratched cylinder bores must be honed.





6. Check the top of the cylinder block for warpage. Measure along the edges and across the center as shown.





7. Calculate the difference between cylinder bore diameter and piston diameter.