ENGINE 3-53 CYLINDER CRANKCASE SERVICING (3-56) CYLINDER DISTORTION • Check the gasketed surface of the cylinder for distortion with a straightedge and thickness gauge, taking a clearance read- ing at several places as indicated. • If the largest reading at any position of the straightedge exceeds the limit, replace the crankcase set. Cylinder distortion: Service Limit: 0.02 mm (0.008 in) 09900-20803: Thickness gauge CYLINDER BORE • Inspect the cylinder wall for any scratches, nicks or other damage. • Measure the cylinder bore diameter at six places. Cylinder bore: Standard: 73.400 – 73.415 mm (2.8900 – 2.8903 in) 09900-20508: Cylinder gauge set E L P M A S