Block and Piston Inspection

Block and Piston Inspection

1. Remove the pistons from the engine block Crankshaft and Piston Removal.

2. Check the piston for distortion or cracks.

3. Measure the piston skirt diameter (A) at a point 10 mm (0.39 in) from the bottom of the skirt. There are two standard-size pistons (/ (slash) and B). The letter is stamped on the top of the piston. Letters are also stamped on the engine block as cylinder bore sizes.






















4. Measure the wear and taper in direction 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 engine block. If the engine block has to be rebored, refer to step 7 after reboring.






















5. Hone any scored or scratched cylinder bores Cylinder Bore Honing.

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 cylinder bore for excessive wear.