3-33
OILING SYSTEM (COLOR FOLDOUT)
NOTE
The following paragraph numbers correspond with the num-
bered callouts in the INTERNAL ENGINE PASSAGES illus-
tration.
1. Oil is gravity-fed from the oil tank to the gerotor-style oil
pump through a
feed hose.
Oil enters the
feed section
and fills a cavity located under the feed pump.
NOTE
A complete explanation of the gerotor pump is given under
OIL PUMP.
2. The feed pump transfers oil from the inlet cavity through
the
feed hose
to the oil filter mount.
3. Oil flows through the
filter mount cavity
to the oil filter.
4. Oil enters the peripheral cavity of the
oil filter,
passes
through the filtering medium into the central cavity of the
oil filter, and flows into the filter adapter (fitting which con-
nects filter to filter mount).
5. Adequate oil pressure in the filter mount cavity activates
the
oil pressure signal light switch
and shuts off the oil
pressure signal light.
6. Oil flowing from the filter adapter opens the
check ball.
The check ball opens at 4-6 psi (28-41 kN/m
2
) oil pres-
sure.
7. With the check ball open, oil flows into the
crankcase
feed galley.
8. Oil flows through the feed galley in the crankcase to the
tappet blocks and hydraulic lifters.
Cross-drilled pas-
sages
intersect the main feed galley and carry oil to each
hydraulic lifter.
9. Oil also enters an
intersecting passage
in the gearcase
cover. Oil flow is then routed to the crankshaft area.
10. Oil enters a hole in the end of the
pinion gear shaft
and
travels to the right flywheel where it is routed through the
flywheel to the
crankpin.
Oil is forced through the crank-
pin to properly lubricate the rod bearing assembly.
11. Oil flows up passages in the
push rods
to the rocker arm
shafts and bushings.
12. The valve stems are lubricated by oil supplied through
drilled oil holes in the
rocker arms.
13. Oil collected in the push rod areas of the cylinder heads
flows down the
push rod covers, through drain holes in
the tappet blocks and into the gearcase.
14. Feed oil to the rocker area is returned to the crankcase
through a passage in the head and cylinder.
15. Oil collected in the sump is splash-fed to the pistons, cyl-
inder walls and flywheel components.
16. Oil collected in the sump area returns to the scavenge
section of the oil pump through a passage located in the
rear section of the sump. Oil flow to the pump is accom-
plished by the scavenging effect of the pump and by the
pressure created by the downward stroke of the pistons.
17. Return oil fills a cavity above the pump's return gears.
The return gears pump oil back to the oil tank.
18. A small amount of oil flows from the feed galley in the
right crankcase half through a restricted orifice, which
sprays the oil onto the rear intake cam gear in the gear-
case. Oil is transferred to the teeth of all the cam gears
through the gear meshing action.
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