TM 10-4320-344-244.4.15 PistonandConnectingRodAssemblyMaintenance,Models609-CandUS636HCCD-1. (Continued)4.4.15.2 Repair.If piston does not meet inspection requirements, is defective or damaged, andneeds to be replaced, the piston pin, piston rings, and cylinder must also bereplaced.a .Inspect piston (1) and piston rings (9) for cracks, chips, and burrs. Ensurepiston (10) ring grooves are free of foreign matter.b.Using piston ring, insert pin on gauge into first ring groove of piston (1).If gauge body touches piston (1), piston (1) is defective.c .Using micrometer, inspect piston (1) to the dimensions listed in Table 4-9.The values in { } are for Model US636HCCD-1 when different from Model 609-C.Table 4-9. Piston Dimensions, Models 609-C and US636HCCD-1.DimensionMinimumMaximumDiameter3.9331 inches (99.901 mm)3.9338 inches (99.919 mm){4.0107 inches (101.872 mm)}(4.0121 inches (101.907 mm)}Number of oversizes2 {1}Distance between0.0394 inches (1.000 mm)0.0472 inches (1.200 mm)piston and cylinderheadBore for piston pin1.3780 inches (35.000 mm)1.3782 inches (35.006 mm){1.5748 inches (40.000 mm)}{1.5750 inches (40.006 mm)}2nd and 3rd ring0.0988 inches (2.509 mm)0.1028 inches (2.610 nun)groove height{0.1016 inches (2.580 mm)}{0.1024 inches (2.600 mm)}4th ring groove0.1980 inches (5.030 mm)0.1988 inches (5.050 mm)heightFigure 4-26. Piston Ring Gap Measurement, Models 609-C and US636HCCD-1.d.Insert ring into cylinder (Figure 4-26, 1). Use piston to push ring down to apoint 1.18 inches (30 mm) from top of cylinder (1). Measure and record ringend gap. Remove ring.4-52NOTENOTE
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