Block and Piston Inspection
Inspection1. Remove the crankshaft and 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.
Oversize Piston Diameter:
0.25: 73.23 - 73.24 mm (2.8831 - 2.8835 inch)
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 block. If the block is to be rebored, refer to step 7 after reboring.
Cylinder Bore Size:
Standard (New): 73.00 - 73.02 mm (2.8740 - 2.8748 inch)
Service Limit: 73.07 mm (2.8767 inch)
Oversize:
0.25: 73.25 - 73.27 mm (2.8839 - 2.8846 inch)
Reboring limit: 0.25 mm (0.01 inch) max.
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 block for warpage. Measure along the edges and across the center as shown.
Engine Block Warpage:
Standard (New): 0.07 mm (0.003 inch) max.
Service Limit: 0.10 mm (0.004 inch)
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 cylinder block for excessive wear.