Operating instructions

2-8 MAY 1980
d. Passageways from the left crankcase gallery
direct oil to the front, intermediate and rear main
bearings.
e. Four drilled passages radiating from the rear
main bearing conduct lubricating oil to the adapter
ports of the fuel pump drive, right and left magneto
and accessory drives and to starter shaftgear
bearing. An intersecting passage directs oil to the
idler gear support.
f. Oil is returned to the sump through a system of
oil transfer tubes and drain holes.
2-14. LUBRICATION SYSTEM FOR PERMOLD
CRANKCASE.
a. Oil is drawn from the sump through the suction tube
to the intake side of the engine driven, gear type, oil
pump. From the outlet side of the pump, oil is
directed to the full flow, replaceable oil filter. A by-
pass valve is incorporated in the filter in the event that
the element becomes clogged. Lubrication reaches the
tachometer drive gears through oil passages drilled in
the oil pump cover. An oil pressure relief valve is
incorporated in the oil pump housing.
b. From the filter discharge port, oil is directed
through a crankcase passage to the oil cooler. In
addition to facilities for temperature and oil pressure
connections, the oil cooler incorporates an oil
temperature control valve. Oil passing through the oil
temperature control valve cavity is directed either
through the oil cooler or directly to the crankcase
passage to the rear of the camshaft, depending on the
oil temperature. In this manner, engine oil
temperature is maintained at 170
°
F.
c. Oil entering the engine is directed to the hollow
camshaft, which serves as the engine main oil gallery.
Grooves and drilled holes in the camshaft are located
so as to afford proper lubrication through a system of
orifices to the main bearings, lifters, idler gear
bushing, accessory drive gear bushings and the starter
drive gear bearing.
d. Oil leaving the camshaft interior at the front of the
crankcase is directed to the left main crank- case
gallery. From there it is directed to the main thrust
bearing and the governor drive gear.
e. From the governor drive gear lubricating oil is
directed to the crankshaft oil transfer collar, which in
turn directs oil to the interior of the crankshaft.
f. Oil transfer tubes and drain holes are provided to
return oil to the sump.
2-15. VALVE MECHANISM. Oil fed to
hydraulic valve lifters, under pressure from the
hollow cam- shaft is divided between the overhead
system, the lifter guide surfaces and the reservoirs
inside the lifters. The oil which reaches the pushrod
ends is forced through the pushrods to the drilled
rockers and the groove between their bushings.
Each intake valve rocker directs a portion of its oil
through a squirt nozzle towards the exhaust valve
stem. The oil spray from the rockers lubricates the
valve stems and springs. Oil is returned to the
crankcase through the pushrod housings which are
sealed to cylinder heads and crankcase by rubber
packings. Drain holes in valve lifter guides direct
the returning oil to the sump.
1. Body
2. Spring, plunger
3. Housing, check valve
4. Spring, check valve
5. Plate, check valve
6. Plunger
7. Socket
8. Ring, retaining
9. Oil groove, exterior
10. Oil inlet, body
11. Oil groove, interior
12. Oil inlet, plunger
13. Oil reservoir plunger
14. Hole, oil discharge
15. Oil reservoir, body
16. Hole, oil outlet
FIGURE 2-6. CUT-AWAY VIEW OF HYDRAULIC
VALVE LIFTER.