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 Figure 3-71. Oil pump drive shaft and gear assembly.
(2) Place the idler gear support (25) in position against the forward end of the pump body and secure the support
to the body with bolt (24).
(3) Install the drive gear and shaft assembly in the pump body and slide the driven gear (36) onto the shaft (43).
(4) Secure the pump cover (41) to the oil pump body with four bolts (37) and lock washers.
(5) Support the drive gear end of the drive shaft (17) on the bed of an arbor press and insert the woodruff key (26)
in the keyway of the shaft. Position the drive-driven gear (23) on the end of the drive shaft with the extended hub side up
away from the pump body. Insert a .005 inch feeler ribbon between the driven gear and the pump body. Press the gear
along the shaft until the clearance between the gear and the body is .005 inches.
(6) If locating pin (19) was removed, install it in the idler gear support (25), then lubricate the bearing surface with
engine oil and place gear (18) in position on the support (25) with the flat side of the gear facing the support.
(7) Place the lock washer (20) on the bolt (21) and the special washer (22) next to the lock washer, then start the
bolt into the idler gear support. Rotate the special washer and lock washer so that the slot in each washer engages the
locating pin (19).
(8) Tighten the idler gear bolt so the bolt head is over the end of the locating pin, then bend the lock washer
against one flat of the bolt head.
(9) Screw the relief valve plug (8), with copper gasket (32), into place in the side of the pump body opposite the
inlet opening. Then place the valve (47) and spring (48) in the bore at the inlet side of the pump body. While compressing
the spring, start the second relief valve plug (8) with gasket (32), into the body. Tighten both plugs.
e. Replacement of Oil Pump Drive Gear on Crankshaft.
(1) Use gear puller J 3051 to remove this gear after removing crankshaft front cover and oil slinger.
(2) A new gear may be installed, after the woodruff key is placed in the crankshaft key slot, by tapping gear into
position against the shoulder on the crankshaft with a large sleeve and mallet. Then place the oil slinger on the crankshaft
with the dish side away from the gear and replace the front cover.
(1) Hold the pump assembly against the main bearing caps so the idler gear (18) meshes with the driving gear on
the crankshaft.
(2) Insert the four bolts (45) with lock washers through the mounting feet of the pump and into the main bearing
caps. Align the pump so that the teeth of the crankshaft gear and the idler gear are parallel; then tighten the bolts to 35-39
lb-ft and check clearance between the gear teeth with a feeler gage. Proper clearance between the crankshaft gear and
idler gear is .002 inch minimum, .012 inch maximum.
NOTE
If shims were used between the pump mounting feet and the bearing caps and new gears
are not installed, the same shims (cleaned) or the same number of new (identical) shims
should be installed and the number then adjusted to obtain the proper clearance between
gear teeth. However, if new gears have been installed, a larger number of shims will be
required under the mounting feet. In either event, the pump must be tightened on the
bearing cap before the clearance between the gear teeth is measured. When adjusting for
gear tooth clearance by installing or removing shims, the same number of shims must be
changed under each foot so that the pump will always be level on the main bearing caps.
The insertion or removal of one .005 inch shim will change the gear tooth clearance by
.0035 inch.
(3) Place a new gasket (16) between the outlet pipe and the pressure regulator and bolt the two parts together
loosely. Use a new gasket (34) and secure the outlet pipe (31) to the oil pump body (35) with the bolts (33). Attach the
pressure regulator (10) to the cylinder block using a new gasket (9).
3-98
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