(4) Remove the drive gear (16) and drive shaft (18) from the oil pump body(23).
(5) Remove the pin (17) and drive gear(16) from the drive shaft (18).
(6) Lift the idler gear shaft (22) and idler gear (24) from the oil pump body(23).
d. Cleaning, Inspection, and Repair.
(1) Clean all parts with an approved cleaning solvent and dry thoroughly with compressed air.
(2) Clean the screen in an approved cleaning solvent and dry thoroughly with compressed air.
(3) Inspect the gears for chipping, cracks, scoring or broken teeth. Replace defective gears.
(4) Inspect the shafts for cracks, chips and scoring. Repair as necessary.
(5) Test the fit of the idler gear on the idler gear shaft. The gear should turn freely, but should have no
perceptible wobble. If the gear wobbles, measure the gear bore diameter. If the gear bore diameter
exceeds 0.0015 of an inch replace the gear.
(6) Measure the drive shaft diameter and pump body bore. Replace either item if worn beyond 0.020 of
an inch.
(7) Check the keyway in the drive shaft and drive gear. Repair any burred keyways, or replace the shaft
as necessary.
(8) Inspect the screen for enlarged openings or tears. Replace as necessary.
(9) Inspect the check ball and check ball seat for smoothness and wear. Replace either ball or cover as
necessary.
(10) Inspect the valve spring for pitting or weakness and replace as necessary.
(11) Inspect the hardware for cracks, or damaged threads and replace as necessary.
(12) Inspect the cover for cracks, dents, or breaks. Repair or replace as necessary.
e. Reassembly.
(1) Install the idler gear shaft (22, fig. 39)and idler gear (24) in the oil pump body (23).
(2) Position the drive gear (16) on the drive gear shaft and install the pin (17).
(3) Slide the drive shaft (18) into the oil pump body (23).
(4) Install the machine screws (14) securing the gasket (15) and cover (13) to the oil pump body (23).
(5) Position the screen (12) on the cover (13) and install the lockwasher (11) and screw (10).
(6) Position the check ball (7) and spring (8) in the cover (13) and install the cotter pin (9) securing
them in the cover (13).
f. Installation.
(1) Position the oil pump in the engine crankcase.
(2) Insert the woodruff key in the drive shaft.
(3) Slide the oil pump gear (20, fig. 39) on the drive shaft and install the nut (21) securing the gear to
the shaft.
(4) Install the allen head setscrew (2) and slotted pipe plug (1) in the oil pump into position.
(5) Install the lockwashers (15, fig. 31) and capscrews (14) securing the gasket (6) and oil pan (7) to
the engine crankcase.
(6) Install the oil drain plug in the oil pan.
(7) Install the engine and water pump unit in the water distributor (para. 123).
(8) Install the timing gear cover (para. 131).
(9) Fill the engine crankcase (LO 5-3825-221-15).
(10) Install the engine flywheel housing and flywheel (para. 68).
(11) Install the canopy (para. 68).
134. Oil Pump Relief Valve
a. Removal.
(1) Remove the oil pan and remove the oil pump (para. 133).
(2) Remove the machine screw (10, fig. 39), lockwasher (11) and screen (12) from the cover (13).
(3) Remove the machine screws (14), cover (13), and gasket (15) from the oil pump body (23).
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