CAC Gasoline Engine Maintenance And Servicing Manual
44
【13】. Engine oiling system:
1). The description of the oiling system:
Through oil collector (2), the rotary oil pump(1) which is
installed in the front end of crankshaft draws oil from oil pan (3)
and pressurizes. The pressure oil comes into the full flow type
oil filter through the assistant oil passage (4) on the left of
cylinder body (viewed from the front). The pressure relief valve
(6) is installed inside the oil pump case to control main oil
passage pressure . The pressure relief valve will be opened under
the pressure within 440kPa±20kPa. The filtered oil comes out
from the center hole of oil filter and comes into the main oil
passage of engine (5) through the center hole of filter connector.
From the main oil passage, oil lubricates the main bearing
through the bore in the cylinder body and lubricates the
connecting rod bearing through oil passage in the crankshaft.
There is a small oil port in the connecting rod bearing bore
near the exhaust side in the connecting rod body. The oil sprays
out from this small oil port to lubricate the piston pin and cylinder
bore.
Oil pressure sensor (8) is located near the oil filter. It is
connected with the main oil passage by a inner oil passage. Oil is
provided to the third journal of camshaft through this oil passage.
Other journals of camshaft are lubricated by the oil provided
by the middle oil passage of camshaft. Two sides of the middle
oil passage are sealed by steel ball.
Hydraulic lifter oil comes from oil gallery on cylinder head,
which is supplied from oil channel on camshaft neck
The oil provided by the oil port inside the hydraulic valve
lifting rod lubricates the contact face
of valve rocker and hydraulic valve lifting rod.
The oil to
lubricate the rocker carrier is provided by the oil passage of
cylinder head.
The
contact face of the tip end of valve and rocker is lubricated by
splashing.
1.
rotary oil pump assembly 6. oil pump pressure
relief valve
2. oil collector 7. fuel filter
3. oil pan 8. oil pressure sensor
4. assistant oil passage of cylinder 9. camshaft
5.
main oil passage of cylinder 10. Hydraulic valve
lifter
fig. 71
Fig. 72
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