Oil Pump Cover; Oil Pump And Filter Assembly; Oil Pressure Relief Valve; Gear End Clearance Measurement - Jeep J-10 Series 1982 Technical & Service Manual

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OIL PUMP
CAVITY OIL
FILTER
ANTI-LOCK
RELEASE
PORT
(BYPASSES OIL
TO PUMP
INLET
PASSAGE)
PUMP
OUTLET
(TO OIL
FILTER)
PRESSURE
RELEASE
VALVE
INLET
ANTI-LOCK
RELEASE PORT
(BYPASSES OIL
THAT HAS BEEN
TRAPPED BEHIND
POPPET VALVE
TO BLEED OFF)
PRESSURE
RELEASE
VALVE
ASSEMBLY
60266
Fig. 1B-125 Oil Pump Cover
Oil Pump
The positive-displacement gear-type oil pump is
driven by the distributor shaft, which is driven by a gear
on the camshaft (fig. 1B-126). The pump is integral with
the timing case cover. A cavity in the cover forms the
body of the pump. A pressure relief valve regulates
maximum oil pressure.
Oil pump removal or replacement will not affect the
distributor timing because the distributor drive gear
will remain in mesh with the camshaft drive gear.
ODProtare Relief Valve
The oil pressure relief valve is not adjustable. The
spring tension is calibrated for 75 psi (517 kPa) max
imum pressure.
In the relief position, the valve permits oil to bypass
through a passage in the pump cover to the inlet side of
the pump (fig. 1B-126).
Removal
(1) Remove retaining screws and separate oil pump
cover, gasket and oil filter as an assembly from pump
body (timing case cover).
TIMING
CASE
COVER
IDLER SHAFT
IDLER GEAR
OIL PRESSURE RELEASE
VALVE ASSEMBLY
OIL FILTER BYPASS
VALVE ASSEMBLY
OIL FILTER
ENGINES 1B-85
DRIVE SHAFT
AND GEAR
GASKET
OIL PUMP COVER
OIL FILTER
ADAPTER
41923
Rg. 1B-126 .011 Pump end Filter Assenbfy
(2) Remove drive gear assembly and idler gear by
sliding them out of body.
(3) Remove oil pressure relief valve from pump
cover for cleaning by removing retaining cap and spring.
Clean cover thoroughly. Test operation of relief valve by
inserting poppet valve and determining if it slides back
and forth freely. If not, replace pump cover and poppet
valve.
fleer End Clearance Measurement
This measurement determines the distance between
the end of the pump gear and the pump cover. The ideal
clearance is as close as possible without binding gears.
The pump cover gasket is 0.009- to 0.011-inch (0.229 to
0.279 mm) thick. Symptoms of excessive pump clearance
are fair to good pressure when the oil is cold and low or
no pressure when the oil is hot.
Preferred Method:
(1) Place strip of Plastigage across full width of
each gear (fig. 1B-127).
(2) Install pump cover and gasket. Tighten screws
with 55 inch-pounds (6 N«m) torque.