Usage, repair and maintenance specification of CAC gasoline engine
【13】. Engine oiling system:
1). The description of the oiling system:
Fig. 72
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
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.
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