Figure 3-20. Crankcase cover (oil pan) and engine supports, Removal and installation.

Figure 3-20. Crankcase cover (oil pan) and engine supports, Removal and installation.

3-22. Oil Pump

d. Inspection.

(1) Inspect the gears for cracked, chipped, or

a. General. The engine lubrication oil pump is

worn teeth.

submerged in the lubrication oil and force feeds the

oil to spray nozzles, which spray oil to the con-

(2) Inspect body for cracks.

necting rod bearings and other operating parts of

(3) Test the fit of the idler gear on the idler

gear shaft. The gear should turn freely but should

the engine.

have no perceptible wobble. Replace a defective

b. Removal

gear or shaft.

(1) Remove the gear cover (para 3-20).

(4) Measure the oil pump drive shaft diameter

(2) Remove crankcase cover and engine

and body bore. If the drive shaft is worn less than

supports (para 3-21).

0.4993 inch or if the pump body bore is more than

(3) Remove oil pump and pump drive gear

0.5015 inch, replace the drive shaft and pump

(fig. 3-21 ) as follows:

body.

.(a) Remove slotted pipe plug and oil pump

(5) Inspect the strainer screen for tears or

lockscrew.

enlarged openings and replace if defective.

(b) Remove locknut holding oil pump

e. Reassembly. Refer to figure 3-22 and

driving gear to shaft.

reassemble the oil pump in the reverse order of

disassembly.

shaft through gear.

f. Installation.

(d) Withdraw oil pump toward center of

(1) Install the oil pump in the reverse

crankcase.

procedure of removal (fig. 3-21).

c. D i s a s s e m b l y . R e f e r t o f i g u r e 3 - 2 2 a n d

(2) Install the crankcase cover and engine

disassemble the oil pump in numerical sequence.

supports (para 3-21).

(3) Install the gear cover (para 3-20).

3-26