TM 5-3895-346-14
OIL PUMP
ENGINE OVERHAUL
Figure 4. Measuring Clearance from Face of Pump Body to Side of Rotor
2. Lubricate the oil pump inner rotor with engine oil and place it inside of the outer rotor.
3. Place the cover plate on the pump body and align the drive-screw and boltholes with the holes in the pump
body. Since the holes are offset, the cover plate can be installed in only one position.
4. Install two new drive screws to hold the assembly together.
Remove Pump Drive Gear From Crankshaft
With the lower engine front cover and the lubricating oil pump removed from the engine, the oil pump drive
gear may, if necessary, be removed from the end of the crankshaft as follows:
1. Thread the crankshaft pulley-retaining bolt in the end of the crankshaft (Fig. 7).
2. Attach the jaws of a suitable gear puller behind the gear and locate the end of the puller screw in the center
of the pulley-retaining bolt.
3. Turn the puller screw clockwise to remove the gear from the crankshaft.
Install Pump Drive Gear on Crankshaft
1. Lubricate the inside diameter of a new oil pump drive gear with engine oil. Then start the gear straight on
the crankshaft with the chamfered edge of the gear toward the butt end of the crankshaft. Reinstallation of a
used gear is not recommended.
2. Position the drive-gear installer J 8968-01 over the end of the crank- shaft and against the drive gear and
force the gear in place as shown in Fig. 8. When the end of the bore in the tool contacts the end of the crank-
shaft, the drive gear is correctly positioned (2.680 inches from the front end of the crankshaft to the forward
face of the gear).
3. It is important that the press fit of the drive gear to the crankshaft be checked to be sure that the gear does
not slip on the crankshaft. It is recommended that the -press fit (slip torque) be checked with tool J 23126. On
in-line engines, the drive gear should not slip on the crankshaft at 100 lb ft (136 Nm) torque.
CAUTION
Do not exceed this torque. If the gear slips on the shaft, it is suggested that another oil pump
drive gear be installed.
Install Oil Pump
1. The markings on the pump body indicate the installation as pertaining to left- or right-hand crankshaft
rotation. Be sure that the letters UP R.H. (right-hand rotation engine) on the pump body are at the top (Fig. 1).
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