Chery A11. Manual — part 26
CAC Gasoline Engine Maintenance And Servicing Manual
59
The intake manifold ‘s air may be preheated by the electrical heater as well as by coolant. As the coolant’s
temperature is lower than 60°, the electronic heater will be energized to facilitate the cold starting.
The electrical heater’s energizing or deenergizing is controlled by the intake preheating switch and relay.
The intake preheating switch is installed in the M22 bolt hole in the thermostat seat(with the hole
plugged by plug screw for carburetor engine).
The intake preheating switch’s operation parameters:
Switching off temperature: 63±4°
Switching on temperature: ≥52°
Operation voltage: 6—24V
Electrical heater parameters:…
Voltage: 15V
Initial current: ≤75A
Cold resistance: 0.2—0.4Ω
temperature after 12-second energizing: ＞60℃
temperature after 180-second energizing: ＞135℃
3.3 Removal and assembly for the intake manifold assembly and front lifting lug:
Removal:
——Loose and remove two M8 lock nuts from the right front
lifting lug.
——Remove the front lifting lug.
——Loose and remove the remaining four M8 lock nuts.
——Remove the intake manifold.
——Remove the intake manifold sealing gasket.
——Remove six studs with equal length using two M8 nuts.
Assembly:
——Apply lotite sealant 201 on the cylinder head bolt threads and
screw six studs into the cylinder head.
——Assemble
the
new sealing gasket onto the studs.
——Install the intake
manifold assembly.
——Install the front lifting lug onto the right two studs.
——Finger screw in nuts and tighten to16-20Nm.
Fig. 105
Front lug
CAC Gasoline Engine Maintenance And Servicing Manual
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4. The removal and assembly for the exhaust manifold, heat insulation cover and rear lifting lug:
Removal:
－Loose and remove the M12×25 allen screw, and remove
the rear lug .
－Loose and remove two M8×12 screw and remove the
heat insulation cover .
－Loose and remove 8 M8 lock nuts and washers.－remove
the exhaust manifold.
－Remove the exhaust manifold sealing gasket.－Remove
eight M8 studs of same length.
Assembly:
－screw in 8 M8 studs of same length and tighten them with
two nuts.
－Assemble the new exhaust manifold sealing gasket.
－Install the exhaust manifold.
－Put the washers onto the studs and tighten lock nuts with
hands, tightening torque is 14-17Nm .
－Assemble the heat insulation cover and tighten two bolts
with hands ,tightening torque is 14-19Nm .
－install the rear lug and tighten allen screw with hands ,
tightening torque is 50-60Nm.
5. for oxygen sensor and 3 way catalyst Converter, See
“CAC480M Engine’s single port injection system”
Bolt
insulating
cover
exhaust
manifold
Fig.106
Flat washer
hexagonal nut
Water temp.
sensor
Sealing gasket
CAC Gasoline Engine Maintenance And Servicing Manual
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【16】 Positive Crankcase Ventilation（PCV）system of engine.
1. Description for PCV system of the Carburetor engine:
PCV system is a closed system.
The leaking air of piston from the Crankcase goes to the
cylinder head cover through the PCV hose. The exhaust gas enters
the intake manifold passing the 3-way pipe after throttled by the
absolute pressure pipe connector. The gas in the crankcase enter
the 3 -way pipe through the guide cover to ventilate the crankcase.
The PCV system includes oil baffle assembly, PCV
pipe—cylinder block, absolute pressure transmission hose
connector, 3-way connector, valve chamber cover, connecting hose,
ventilation hose. See the above for Removal and Assembly of oil
baffle assembly and valve chamber cover assembly.
2. Description for PCV system of 480M engine
2.1 Description of
PCV system.
The
PCV
system is a closed
system.
The leaking air
of piston goes to the
rear cylinder head
cover
from
the
Crankcase through
the PCV hose. PCV
valve is connected
to
the
intake
manifold. Meantime,
a Ф15 hose in the
front of the valve
chamber
cover
assembly
is
connected to the
guide cover and PCV valve by the 3-way connector
through a hose.
The PCV system includes oil baffle
assembly, PCV pipe——cylinder block,
PCV hose, PCV valve, 3-way connector,
valve chamber cover, connecting hose,
and ventilation hose.
Connection
hose
3 way connector
Absolute pressure transmitting hose connector
in intake gas hose
PCV valve
3 way connector
C
o
n
n
e
c
t
to
g
u
id
e
c
o
v
e
r
Connect to cylinder cap
cover
C
o
n
n
e
c
t
to
in
ta
k
e
g
a
s
C
o
n
n
e
c
t
to
g
u
id
e
c
o
v
e
r
Connection hose
C
h
a
m
b
er
c
o
v
e
r
c
a
p
Clip
Fig. 107
CAC Gasoline Engine Maintenance And Servicing Manual
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2.2 PCV valve’s function:
under the low speed condition, the vacuum of intake manifold
is very high, which keep the valve closed, and only a small opening
exists to allow the gas pass through. Therefore it won’t change the
mixture rate. Under high speed condition, the vacuum of intake
manifold decreases, and the spring forces the valve to open to allow
more gas in the crankcase flow into intake manifold.
the PCV valve is designed to open fully enough to allow the
gas exhaust from the crankcase under high speed or low speed
conditions.
【17】. Fuel supply system of the carburetor engine.
1.
Fuel supply system of the carburetor engine.
1.1 Description
of
the
fuel
supply system.
The fuel in
the tank flows
into oil filter
pumped by the
fuel pump and
goes
into
carburetor after
being
filtered
through
fuel
pump
.
A
amount of fuel
returns to the
tank
through
return pipe .
1.2 Removal and assembly of the fuel pump:
——Remove two M8 lock nuts.
——Take out the fuel pump.
——Remove the fuel pump sealing gasket.
——pull out the push rod.
From crankbase
From crankbase
the operation condition of low speed-high vacuity
to intake manifold
the operation condition of high speed- low vacuity
Fig.109
to intake manifold
Engine
Fig.110 schematic drawing of fuel supply system for engine
gasoline filter 3. gasoline pump
Fig. 111
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