- Check the cylinder block upper face distortion. Use a straight edge and a feeler gauge to measure the four sides and the two diagonals of the cylinder block upper face.
Cylinder block upper face distortion:
Standard (New):
0.05 mm (0.002 in.) or less
Service limit:
0.1 mm (0.004 in.)
- Check the cylinder block height.
Standard (New):
272 mm (10.71 in.)
- Measure the cylinder block bore.
- Take measurements at measuring point (A) across positions (''W – W''), (''X – X''), (''Y – Y'') and (''Z – Z'').
Measuring point (A):
12, 55 and 95 mm
- Calculate the average value of the four measurements to determine the correct cylinder grade.
NOTE: It is most important that the correct piston grade be used. Failure to select the incorrect piston grade will result in engine failure.
Cylinder block bore grade:
Grade A:
79.001 – 79.010 mm
(3.1102 – 3.1106 in.)
Grade B:
79.011 – 79.020 mm
(3.1107 – 3.1110 in.)
Grade C:
79.021 – 79.030 mm
(3.1111 – 3.1114 in.)
