TM 5-4320-302-146-17.CONNECTING ROD ASSEMBLY (CONT)Location/ItemActionRemarks2.Small-enda.Adjust inside micrometer to 1.3780 inchesbush (35.0 mm).b.Measure and record small-end bush bore or insidediameter. Measure bush at points 1 and 2 along axis Aand B. Measurements should be 1.3794 to 1.3811inches (35.036 to 35.080 mm). If any measurement isoutside these limits, replace small-end bush.3.Piston pinMeasure and record diameter of correspondingpiston pin with micrometer at several points alongthe length of the pin. The diameter should be1.3777 to 1.3780 inches (34.994 to 35.0 mm). If anymeasurement is outside these limits, replace pistonpin.4.Piston pinDetermine piston pin clearance in small-endclearance bush. Subtract piston pin diametermeasured in step 4 from small-end bush boremeasurement recorded in step 3. Clearance shouldbe 0.0014 to 0.0034 inch (0.036 to 0.086 mm) undernormal conditions. If it is greater than 0.0098 inch(0.25 mm), piston pin and small-end bush should beremeasured and clearance redetermined. Ifclearance is still greater than 0.0098 inch (0.25mm), replace piston pin or small-end bush, or both.Be sure to recheck measurements and clearancesto see that they fall within their respective tolerancelimits.6-125
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