TM 10-3930-659-34 4-19.  ENGINE OIL PUMP REPLACEMENT (Con’t). NOTE If any measurement in steps 3 through 10 does not meet specification, replace engine oil pump. 3. Using feeler gage and ruler, measure clearance between drive shaft spur gear (3) and engine oil pump   (2).      Maximum   allowable   clearance   is 0.0085 in.  (0.2159 mm). 4. Using  feeler  gage,  measure  clearance  between each   tooth   of   drive   shaft   spur   gear   (3)   and engine oil pump (2), and  between  each  tooth  of spur  gear  (12)  and  engine  oil  pump.    Maximum allowable clearance is 0.009 in.  (0.2286 mm). 5. Remove drive shaft spur gear (3) from engine oil pump (2). 4-77