TM 10-4320-344-24e .f .g .Repeat step d until all rings (Figure 4-25, 9) have been checked. The correctgap dimensions should be as listed in Table 4-10.Table 4-10. Gap Dimensions.DimensionMinimumMaximum1st ring gap0.0177 inches (0.450 mm)0.0315 inches (0.800 mm)2nd ring gap0.0177 inches (0.450 mm)0.0315 inches (0.800 mm)3rd ring gap0.0197 inches (0.500 mm)0.0315 inches (0.800 mm)4th ring gap0.0157 inches (0.400 mm)0.0315 inches (0.800 mm)Inspect piston pin (3) for burrs, discolorations, wear, or damage. Inspectp i s t o n p i n ( 3 ) d i a m e t e r f o r t h e f o l l o w i n g d i m e n s i o n : 1 . 3 7 8 0 i n c h es(34.994-35.000 mm) on Model 609-C and 1.5746-1.5748 inches (39.994-40.000 mm)on Model US636HCCD-1.Inspect connecting rod (4) for straightness and visible damage.h.i .j .k.l .m.Figure 4-27. Piston Pin Measuring Locations, Models 609-C and US636HCCD-1.Inspect piston pin bushing (Figure 4-27, 1) for burrs, worn spots, anddiscoloration. Measure inside diameter of piston pin bushing (1) at points 1and 2 in planes a and b, as shown in Figure 4-27. ‘The correct measurement is1.3795-1.3813 inches (35.040-35.086 mm) for Model 609-C and 1.5764-1.6079inches (40.040-40.084 mm) for Model US636HCCD-1.Remove any worn piston pin bushing (1) and press in new piston pin bushing(1). Ensure oil holes are aligned between piston pin bushing (1) andconnecting rod (2).Position connecting rod cap (Figure 4-25, 6) on connecting rod (4) and securewith two cap screws (5). Torque cap screws to 22 ft-lbs (30 N•m).Using angle-of-turn indicator, tighten cap screws (5) 60° first stage, then30° second stage.Measure inside diameter of connecting rod bearing bore at points 1 and 2 inthe planes of a and b as shown in Figure 4-27. The correct measurement is2.5197-2.5204 inches (64.000-64.019 mm) for Model 609-C and 2.7559-2.7567inches (70.000-70.019 mm) for Model US636HCCD-1.Remove two cap screws (Figure 4-25, 5) and connecting rod cap (6) fromconnecting rod (4).4-53
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