Measure the piston diameter at a point 10 mm (0.39 in) from the bottom of the skirt. There are two standard-size pistons (No Letter (A), and B). The letter is stamped on the top of the piston. Letters are also stamped on the engine block as the cylinder bore sizes.
Piston Skirt Diameter
Standard (New):
No Letter (A):
86.980?86.990 mm (3.42440?3.42480 in)
B:
86.970?86.980 mm (3.42401?3.42440 in)
Service Limit:
No Letter (A):
86.930 mm (3.42243 in)
B:
86.920 mm (3.42204 in)
3.
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 is being rebored, check the piston-to-cylinder bore clearance.
Cylinder Bore Size
Standard (New):
A or I:
87.010?87.020 mm (3.42558?3.42598 in)
B or II:
87.000?87.010 mm (3.42519?3.42558 in)
Service Limit:
87.070 mm (3.42795 in)
Oversize
0.25:
87.250?87.260 mm (3.43503?3.43543 in)
Reboring Limit:
0.25 mm (0.0098 in) max.
Bore Taper
0.25:
(Difference between first and third measurement) 0.05 mm (0.0020 in)
4.
Hone any cored or scratched cylinder bores if needed.
5.
Check the top of the engine block for warpage. Measure along the edges and across the center as shown.
Engine Block Warpage
Standard (New):
0.07 mm (0.0028 in) max.
6.
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.
