OIL
PRESSURE GAUGE
The gauge is located on the lower front corner of the
cylinder block. If it is damaged, replace
it.
Before
replacing, check for a clogged oil passage behind the
gauge.
OIL
PUMP
The oil pump is mounted on the front of the crankcase
behind the gear cover and is driven by the crankshaft
gear.
Removal:
1.
Remove the gear cover and oil base (refer to
Engine
Repair
section). Unscrew the intake cup
from the pump.
2.
Remove the crankshaft lock ring and gear retain-
ing washer.
3. Loosen the two capscrews holding the pump to
the crankcase and remove the pump.
Repair:
Except for the gaskets, component parts of
the pump are not individually available. If the pump is
defective or worn, replace it. Disassemble the pump
by removing the two capscrews 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 using the thinnest gasket that
permits free movement of the pump shaft. Oil all parts
when reassembling the pump.
Installation:
Before installing, fill the pump intake and
outlet with oil. Mount the pump on the engine and
adjust for .005-inch lash between the pump gear and
the crankshaft gear. Mount the intake cup on the
pump
so
it
is parallel with the bottom of the
crankcase.
BY-PASS
VALVE
The by-pass valve (located on the outside of the rear
bearing plate) controls oil pressure by allowing
excess oil to flow directly back to the crankcase.
Normally the valve begins to open at about
25
psi. It is
non-adjustable and normally needs no maintenance.
To
determine
if
abnormal (high or low) oil pressure is
caused by a sticking plunger, clean and inspect the
valve.
To
remove the valve, unscrew the recessed plug in the
rear bearing plate and lift out the spring and plunger
assembly (Figure
52).
Determine proper valve opera-
tion by checking the spring and plunger according to
the following measurements.
Plunger Diameter.
. .
.
. . . .
.
. .
.
.
.
.
.
.3365" to .3380"
Spring
Free Length
,
. .
.
.
.
.
. .
.
.
. .
. . .
2-5/16"
-
1/16"
OIL
BYPASS
.i
FIGURE
52.
BY-PASS VALVE
W
FLUSH
ROCKER
BOX
OIL LINE.
WITH FUEL AND CLEAN HOLES
WITH FINE WIRE.
FIGURE
53.
CLEANING ROCKER BOX OIL LINE
OIL
FILTER
The full-flow filter is mounted on the filter plate at the
left front corner of the crankcase. Replace normally
after every
200
hours of operation. Remove the filter
by turning counterclockwise. Lubricate the gasket on
the new filter with engine oil. Install the filter until the
gasket touches the base and tighten
1/2
turn; do not
overtighten.
OIL
LINES
The rocker box oil line (Figure
53),
should be flushed
with solvent and thesmall holes cleaned with finewire
at regular intervals. Clean other oil lines and drillings
with compressed air whenever the engine is dis-
assembled or overhauled. Remove the oil mounting
plate to reach the oil gauge passage.
All external oil lines, the rocker box oil line and the
internal oil line to the rear bearing, are replaceable.
42
Redistribution or publication of this document,
by any means, is strictly prohibited.
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