## Engine Block

#### Block and Piston Inspection

7-11

1. 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.)

1. Check the cylinder block height.

Standard (New):

272 mm (10.71 in.)

1. Measure the cylinder block bore.

1. 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

2. 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.)

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