Buick LeSabre 1965 Service Manual page 75

ENGINE
COOLING SYSTEM 2 - 5 3
CHECK FOR CLEARANCE
BETWEEN GEARS AND
STRAIGHT EDGE - NOT
MORE THAN .005"
Figure 2-54—Checking Clearance of
Gears at Cover
bolts are tightened. Torque bolts
to 30 ft. lbs.
2 - 2 5 OIL PUMP SERVICE
( 3 0 0 CU. IN.
ENGINE)
a. Removal of Oil Pump
Cover and Gears
1. Remove oil filter.
2. Disconnect w i r e from oil
pressure indicator switch in filter
by-pass valve cap.
3. Remove screws attaching oil
pump cover assembly to timing
chain cover. Remove cover as-
sembly and slide out oil pump
gears.
b. Inspection
1. Wash off gears and inspect for
wear, scoring, etc. Replace any
gears not found serviceable.
2. Remove the oil pressure relief
valve cap, spring and valve. See
Figure 2-55. Remove the oil filter
by-pass valve cap, spring, and
valve.
3. Wash the parts thoroughly and
inspect the relief valve for wear
or scoring. Check the relief valve
spring to see that it is not worn
on its side or collapsed. Replace
any relief valve spring that is
questionable. Thoroughly clean
the screen staked in the cover.
4. Check the relief valve in its
bore in the cover. The valve
should have no more clearance
than an easy slip fit. If any per-
ceptible side shake can be felt
the valve and/or the cover should
be replaced.
5. Check filter by-pass valve for
cracks, nicks, or warping.. The
valve should be flat and free of
nicks or scratches.
c. Assembly and Installation
1. Lubricate and install pressure
relief valve and spring in bore
of oil pump cover. See Figure
2-55. Install c a p and gasket.
Torque cap to 30-35 pounds with
a reliable torque wrench. Do not
over-tighten.
NOTE: Pressure relief valve
cap has no hole tapped for instal-
lation of oil pressure switch.
2. Install filter by-pass valve flat
in its seat in cover. Install
spring, cap and gasket. Torque
cap to 30-35 ft. lbs. using a reli-
able torque wrench.
3. Install oil pump gears and
shaft in oil pump body section
of timing chain cover to check
gear end clearance.
4. Place a straight edge over the
gears and measure the clearance
between the straight edge and the
gasket surface. Clearance should
be between .0023" and .0058". If
clearance is less than .0018"
check timing chain cover gear
pocket for evidence of wear.
SPRING
Figure 2-55—Oil Pump Cover
Exploded View
5. If gear end clearance is satis-
factory, remove gears and pack
gear pocket full of petroleum
jelly. Do not use chassis lube!!!
6. Reinstall gears so petroleum
jelly is forced into every cavity
of the gear pocket and between
the teeth of the gears. Place
new gasket in position.
NOTE: This step is very im-
portant. Unless the pump is
packed with petroleum jelly, it
may not prime itself when the
engine is started.
7. Install cover assembly screws.
Tighten alternately and evenly.
The torque specification is 10-15
ft. lbs.
8. Install filter on nipple.
CHECK CLEARANCE
BETWEEN STRAIGHT EDGE
& GASKET SURFACE
SHOULD BE BETWEEN
0 0 2 3 " & . 0 0 5 8 "
Figure 2-56—Checking Oil Pump
Gear End Clearance