4. Disassembly, Inspection and Reassembly of Engines954.4.5 Parts inspection and measurement(1) Cylinder blockEspecially clean head surface, cylinder bores and oilholes, and check after removing any carbon depositand bonding agent.(a) Appearance inspectionCheck if there is any discoloration or crack. If crackis suspected, perform color check. Sufficiently cleanthe oil holes and check they are not clogged.(b) Cylinder bore and distortionMeasure at 20 mm below the crest of the liner, at 20mm from the bottom end and at the center.Roundness:Roundness is found as follows though it is thesimple method. Measure cylinder diameters of theA direction and the B direction on each section of a,b and c.Roundness is the maximum value among thosedifference values.Cylindricity:Cylindricity is found as follows though it is thesimple method.Measure cylinder diameters of a, b and c sectionsin the A direction, and calculate the difference inmaximum value and minimum value of themeasured diameters.In the same way measure and calculate thedifference in the B direction.Cylindricity is the maximum value between thosedifference values.mmItem Model Standard Limit3TNV82A 82.000 82.030 82.200TNV84 84.000 84.030 84.200TNV88 88.000 88.030 88.2004TNV94L 94.000 94.030 94.1304TNV98 98.000 98.030 98.130Cylinder inside diameter4TNV106(T) 106.000 106.030 106.130RoundnessCylinder boreCylindricityall TNV 0.01 or less 0.03
