Geely EC715 2009, Workshop Manual

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2.9.2 Description and Operation
2.9.2.1 Description and Operation
Oil Pan
The oil pan is installed at the bottom of the engine crankcase.
The engine oil pump draws engine oil from the oil pan. After
filtered by the oil filter, the engine oil passes through two oil
paths, lubricating cylinder block and cylinder head cover
respectively. In an oil path, the engine oil passes through the
crankshaft oil passage to the connecting rod, and then to the
piston and cylinder, finally, return to the oil pan. In the other oil
path, the engine oil passes through the engine oil passage to
the camshaft, through the oil path within the camshaft,
lubricating valve assembly, then finally return to the oil pan.
Oil Pump
Oil pump draws the engine oil from the oil pan and then pump
the engine oil with pressure to the various parts of the engine.
Oil pump inlet has an oil filter - set filter. Set filter blockage may
damage the oil pump and cause the pump oil inoperative, and
the lubricating system will be unable to establish a normal oil
pressure, which will cause the engine mechanical damage.
Oil pump is driven by the crankshaft concave. As long as the
crankshaft rotates, the oil pump will be working. The oil pump
displacement is fixed, so when the engine speed is high, the
oil pump output pressure will exceed the needs of the engine
lubrication system. There is a safety valve in the oil pump
assembly. The safety pressure relief valve cavity is connected
with the oil pump intake chamber. When the output pressure
exceeds 0.5 MPa (73 psi), the security valve is open, the
excess oil returns to the oil pump through the valve. With the
normal oil supply, the safety valve bypass is closed.
Lubrication Descriptions
The oil filter seat is integrated on the crankcase. Engine oil
passes through the oil filter seat bottom oil path to the oil filter.
After being filtered, engine oil passes through the oil filter seat
upper oil path to return to the cylinder block.
Engine oil passes through the oil path to the cylinder block
front. These oil paths will supply engine oil to the cylinder head,
main bearing oil path, VVT solenoid valves and camshaft
position actuators.
Each cylinder head oil path introduces engine oil into the
cylinder head cover and camshaft bearing journal. Engine oil
passes through the main oil path to the VVT solenoid valve,
VVT solenoid valve oil cavity, to the VVT actuator. VVT
solenoid valve is used to control the intake camshaft position
actuator. Engine Control Module (ECM) controls the VVT
solenoid valve. When the engine control module provides
power to the VVT solenoid valve, the solenoid valve guides the
engine oil to flow through the cylinder head cover camshaft
front bearing caps. Engine oil passes through the intake
camshaft bearing caps into the camshaft journal drilled hole
and flows to the intake camshaft front installation surface.
Then, the engine oil flows to the camshaft position actuator
corresponding oil path. VVT solenoid valve guides engine oil
into the system corresponding oil path, so that the engine oil
pressure acting on the intake camshaft position actuator
internal blades. The intake camshaft (installed on the camshaft
position actuator inner rotor) rotates relative to the sprocket
(mounted on the intake camshaft position actuator housing). At
idle, the internal pin will lock the rotor to the intake camshaft
actuator housing. When starting, the cam actuator position will
maintain the original position or the default position. VVT
solenoid valve guides engine oil hydraulic pressure to loose the
lock pin, so that the intake camshaft position actuator works.
Oil pump contains a small engine oil nozzle, which sprays the
engine oil to timing chain components.
Engine oil passes through the camshaft timing chain drive belt
area or cylinder head cover and cylinder block casting oil return
path and returns to the oil pan.
2-500 Lubricating System JL4G18-D Engine
EC718/EC718RV EC715/EC715RV 10/2009