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2-81 2 NOTE: Measure from PTO to MAG-side of the pis- Readings may vary from side to side. NOTE: Make sure the smaller reading is 1.5 mm 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 0.1 mm (0.004 in.). 0725-586 PISTON SKIRT/CYLINDER CLEARANCE 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 above the piston skirt at a right angle to the piston-pin bore. Subtract this measurement from the measurement in step 1. The difference (clearance) must be within 0.075-0.105 mm (0.0029-0.0041 in.). AC091 PISTON-RING END GAP 1. Place each piston ring in the wear portion above the exhaust port of its respective cylinder. Use the piston to position each ring squarely in each cylin- der. 2. Using a feeler gauge, measure each piston-ring end gap. Acceptable ring end gap must be within 0.30-0.50 mm (0.012-0.0196 in.). 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 21.995-22.000 mm (0.8659-0.8661 in.). If any measurement varies by more than 0.02 mm (0.001 in.), the piston pin and bearing must be replaced as a set. |