OIL
SYSTEM
These
engines have
pressure
lubrication
to all
working
parts. The oil system includes oil intake cup,
gear
type oil
pump,
by-pass
valve, oil
pressure
gage,
full-flow
oil
filter,
and block
passages
and
drillings
to deliver oil throughout
the engine
(Fig.
8-
D.
Oil is held in the oil
base,
drawn by
the pump, and delivered through the
oil
filter.
Lines leading
to
the rocker housing,
drillings,
through the block to crank-
shaft bearings and to
front
camshaft bearing crankshaft
passages
to connecting rod bearings and connection rod
passages
to piston pin bushings complete the oil system
plumbing.
The crankcase breather is. included in this system
because
it
aids
oil
consumption
control.
Oil
pressure
should be 25-psi or higher when the engine is
at normal operating temperature. If
pressure
drops below 20-
psi
at govemed
speed,
inspect the
oil
system
for
faulty
com-
ponents
MAINTENANCE
Periodic
oil system maintenance should include changing
crankcase oil, cleaning the crankcase breather, cleaning
rocker
box oil lines, and replacing the oil
filter.
vJCcmsiilt
the periodic service chart for service periods.
CRANKCASE
F~
BREATHER^"^
BY-PASS
N
VALVE
A939
OIL
PUMP
FIG.
8-1
OIL
PUMP
The
oil pump is mounted on the front of the crankcase be-
hind
the gear cover and is driven by the crankshaft gear.
Removal:
1.
Remove the
gear
cover and oil
base.
(See Engine
Disassembly Section)
2.
Unscrew the intake cup
from
the pump.
3. Remove the crankshaft
lock
ring
and
gear
retaining
washer.
4.
Loosen
the
two
cap screws
holding
the pump and remove
pump.
Repair: Except
for
the
gaskets,
component parts of the pump
are not
individually
available. If the pump is defective or
excessively
worn,
replace it. Disassemble the pump by
removing
the two cap screws
holding
the pump cover to the
body.
Inspect for excessive wear in
gears
and shafts. To
improve
pump performance, adjust the
gear
end clearance
by
changing the gasket thickness between the pump body
and cover. Use the thinnest gasket that permits free move-
ment of the pump shaft. Oil all parts when assembling the
pump.
Installation:
Before
installing,
fill
the pump intake and
outlet
with
oil to be
sure
it is primed.
Mount
the pump on
the engine and adjust for .005" lash between the pump
gear
and crankshaft
gear.
Mount
the intake cup on the pump so
it
is parallel to the
bottom
of the crankcase..
21
REAR
BEARING
PLATE-
OIL
BY-PASS
SPRING
OIL
BY-PASS
VALVE
FIG.
8-2
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