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O I L PUMP
C A V I T Y
T I M I N G
CASE
COVER
I D L E R S H A F T
IDLER GEAR
ANTI-LOCK
RELIEF
PORT
(RELIEVES
TO PUMP
I N L E T
PASSAGE)
PRESSURE
RELIEF
V A L V E
I N L E T
O I L PRESSURE RELIEF
V A L V E ASSEMBLY
PUMP
O U T L E T
(TO OIL
FILTER)
ANTI-LOCK
RELIEF PORT
(ALLOWS O I L
WHICH HAS
BEEN TRAPPED
BEHIND POPPET
V A L V E TO
BLEED OFF)
D R I V E S H A F T
A N D G E A R
O I L FILTER BYPASS
V A L V E ASSEMBLY
PRESSURE
RELIEF
V A L V E
ASSEMBLY
6 0 2 6 6
O I L FILTER
GASKET
OIL PUMP COVER
Fig. 1B-83
Oil Pump Cover
OIL FILTER
ADAPTER
4 1 9 2 3
Gear End Clearance Measurement
This check indicates 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-inch to 0.011-inch (0.229 mm to
0.279 mm) thick. Symptoms of excessive pump clearance
are fair to good pressure when cold, low or no pressure
after starting a hot engine.
Preferred Method:
(1) Place strip of Plastigage across full width of
each gear (fig. 1B-85).
(2) Install pump cover and gasket. Tighten screws
to 55 inch-pounds (6 N»m) torque.
(3) Remove pump cover and determine amount of
clearance by measuring width of compressed Plastigage
with the scale on the Plastigage envelope. Correct clear-
ance by this method is 0.002 to 0.008 inch (0.002 pre-
ferred) [0.051 mm to 0.203 mm (0.051 mm preferred)].
Alternate Method:
(1) Place straightedge across gears and pump body.
(2) Select feeler gauge which will fit snugly but
freely between straightedge and pump body (fig. 1B-86).
Correct clearance by this method is 0.004 to 0.008 inch
Fig. 1B-84
Oil Pump and Filter Assembly
70298
Fig. 1B-85
Oil Pump Gear End Clearance Measurement—
Plastigage Method
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