4. DISASSEMBLY, INSPECTION AND REASSEMBLY OF ENGINES 4.4.5 Parts inspection and measurement (1) Cylinder block Especially clean head surface, cylinder bores and oil holes, and check after removing any car- bon deposit and bonding agent. (a) Appearance inspection Check if there is any discoloration or crack. If crack is suspected, perform color check. Sufficiently clean the oil holes and check they are not clogged. (b) Cylinder bore and distortion Measure at 20 mm below the crest of the liner, at 20 mm from the bottom end and at the center. Roundness: Roundness is found as follows though it is the simple method.
Measure cylinder diam- eters of the A direction and the B direction on each section of a , b and c . Roundness is the maximum value among those difference values. Cylindricity: Cylindricity is found as follows though it is the simple method. Measure cylinder diameters of a , b and c sections in the A direction, and calculate the difference in maximum value and minimum value of the measured diameters. In the same way measure and calculate the difference in the B direction. Cylindricity is the maximum value between those difference values.
mm 4-38 82E-5 – 98E-5 SERIES Item Model Standard Limit Cylinder inside diameter 3D82AE 82.000 – 82.030 82.200 (S)3D84E, (S)4D84E 84.000 – 84.030 84.200 3D88E, 4D88E 88.000 – 88.030 88.200 4D94LE 94.000 – 94.030 94.130 (S)4D98E 98.000 – 98.030 98.130 Cylinder bore Roundness all models 0.01 or less 0.03 Cylindricity