ARMY TM 9-2815-260-24 AIR FORCE TO 38G1-126-2 MARINE CORPS TM 09244A/09245A-24 5-101 (12) Using inner diameter micrometer, measure idler gear (12) inner diameter.  Replace oil pump if idler gear inner diameter is not 0.4864 - 0.4867 in. (12.355 - 12.363 mm). (13) Using outer diameter micrometer, measure idler gear (12) thickness.  Replace oil pump if idler gear thickness is not 1.4163 - 1.4183 in. (35.975 - 36.025 mm) (14) Using outer diameter micrometer, measure outer diameter of shaft inside housing (11).  Replace oil pump if shaft outer diameter is not 0.4849 - 0.4855 in. (12.316 - 12.332 mm). (15) Remove drive gear (13). (16) Using outer diameter micrometer, measure drive gear (13) shaft outer diameter.  Replace oil pump if drive gear shaft outer diameter is not 0.6306 - 0.6314 in. (16.017 - 16.037 mm). (17) Using outer diameter micrometer, measure drive gear (13) thickness.  Replace oil pump if drive gear thickness is not 1.4163 - 1.4183 in. (35.975 - 36.025 mm) (18) Using inner diameter micrometer, measure bushing inner diameter inside housing (11).  Replace oil pump if bushing inner diameter is not 0.6320 - 0.6339 in. (16.052 - 16.102 mm). FIGURE 5-87.  OIL PUMP AXIAL CLEARANCE FIGURE 5-88.  OIL PUMP RADIAL CLEARANCE MEASUREMENT.