【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
64 psi ±3 psi. 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