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2-162 NOTE: Measure from PTO to MAG-side of the pis- Readings may vary from side to side. Make sure the smaller reading is within the specifications listed. CYLINDER TRUENESS 1. Measure each cylinder in the three locations from front to back and side to side for a total of six read- ings. FC044 2. The trueness (out-of-roundness) is the difference between the highest and lowest reading. Maxi- mum trueness (out-of-roundness) must not exceed specifications. 0725-586 PISTON SKIRT/CYLINDER 1. Measure each cylinder front to back about 2.5 cm (1 in.) from the bottom of each cylinder. 2. Measure the corresponding piston skirt diameter at a point 1 cm (0.394 in.) above the piston skirt at a right angle to the piston-pin bore. Subtract this mea- surement from the measurement in step 1. The dif- ference (clearance) must be within specifications. AC091 PISTON-RING END GAP 1. Place each piston ring in the wear portion above the exhaust port of its respective cylinder. Use the pis- ton to position each ring squarely in each cylinder. 2. Using a feeler gauge, measure each piston-ring end gap. Acceptable ring end gap must be within specifications. FC045 PISTON PIN AND PISTON-PIN BORE 1. Measure the piston pin diameter at each end and in the center. Acceptable piston pin measurement must be within specifications. If any measurement varies by more than 0.02 mm (0.001 in.), the pis- ton pin and bearing must be replaced as a set. AN056 |