TM 10-3930-664-24 2. Measure  clearance  between  geroter planetary and body bore (dimension A). Maximum clearance shall be 0.015 in. (0.0381 mm). 3. Measure planetary drive tip clearance (dimension   B).      Maximum   clearance   shall   be 0.007 in.  (0.1778 mm). 4. Measure  clearance  between  geroter planetary (4),   pump   housing   (5),   and   geroter   drive   (6). Maximum  clearance  shall  be  0.005  in.    (0.127 mm). 5. Measure gear backlash (dimension C). Backlash shall be 0.003 TO 0.013 in.  (0.05 TO 0.33 mm). 6. Replace engine oil pump if the fit and clearance limits in steps 2 through 5 are not met. 7. Install  back  plate  (3)  onto  oil  pump  (1).    Fill  oil pump with clean engine oil. 8. Mate oil pump (1) to cylinder block, ensuring that idler  gear  pin  is  installed  into  locating  bore  in cylinder block. 9. Secure   oil   pump   (1)   to   cylinder   block   using screws (2).  Torque screws to 18 ft-lbs (24 Nm) following the sequence shown in figure. NOTE Pump    back    plate    (3)    seats    against bottom of  bore  in  cylinder  block.    When pump  is  correctly  installed.    the  flange on pump will not touch cylinder block. 3-59