TM  10-3930-638-24&P 4-2.   ENGINE   MAINTENANCE   (cont) i. Oil Pump (cont). STEP LOCATION ITEM ACTION REMARKS INSTALLATION  (cont) 16 Oil  pump assembly Oil pump drive gear Check  backlash Use dial indicator placed on drive gear as shown. Check backlash between oil pump drive gear and crankshaft gear. Backlash shall be between 0.002 and 0.008 inch. Add shims (5) to increase or remove shims to decrease backlash 4-74