Oil Pump Assembly - Jeep CJ-3A Owner's Manual

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FIG. 11—OIL PUMP
1—Cover Screw
2—Cover
3—Cover Gasket
4—Outer Rotor
5—Shaft and Rotor
6—Body
7—Driven Gear
8—Gasket
9—Gear Retaining Pin
10—Relief Valve Retainer
11—Relief Valve Retainer. Gasket
12—Relief Valve Spring
13—Relief Valve Plunger

OIL PUMP ASSEMBLY.

The oil pump assembly is provided with a pressure relief valve which controls the maximum oil pressure at all
speeds.
The standard controlled pressure is approximately 30 to 35 lbs. (5.355 to 6.247 Kg./cm.) at 30 mph (48 Km./h.)
and 5 to 10 lbs. (.892 to 1.785 Kg. /cm.) at the idle speed of 600 rpm as registered by the dash gauge. Pressure
may be adjusted by installing or removing shims between the relief plunger spring and the spring retainer. Add
shims to increase the pressure or remove to decrease.
The oil pump drive shaft drives both the pump and the distributor assembly. See Fig. 4. Should it be necessary to
remove the oil pump assembly, first remove the distributor cap and carefully note the position of the rotor to
allow reinstallation without disturbing the ignition timing. When the pump is installed, use care that the driving
key on the end of the distributor shaft is correctly meshed with the slot on the end of the pump shaft. To make the
installation without disturbing ignition timing, the