TM  5-2815-241-34&P LUBRICATING OIL PUMP - CONTINUED ACTION LOCATION ITEM REMARKS ASSEMBLY 17. Oil  pump  body  (1) Drive  shaft  (2)  and Lubricate  with  clean  lubricating  oil  and drive gear (3) position  into  oil  pump  body. 18. Drive  shaft  (2)  and Key (4) and main a. Position key in drive shaft and aline with drive  gear  (3) drive gear (5) main  drive  gear. b. Support drive shaft on arbor press and press  drive  gear  on  drive  shaft. c. Using  thickness  gage,  leave  0.002  to 0.004 inch (0.05 to 0.10 mm) clear- ance  between  drive  gear  surface  and bottom of gear pocket in oil pump body. Also, clearance between main drive gear and oil pump body must not be greater  than  0.012  inch  (0.30  mm). 19. Idler gear (6) Lubricate  with  clean  lubricating  oil  and position on idler shaft (7). NOTE Before installing adapter housing to oil pump body, make sure all gears, shafts, and bushings  are  well  lubricated  with  clean  lubricating  oil. 2-270