Chery SQR 7160 sedan. Manual — part 31
CAC Gasoline Engine Maintenance And Servicing Manual
42
—the size of crankshaft thrust, thrust washer and cylinder block
thrust： unit：mm
Installation：
——Before installation, use the second screw tap taps the threaded
hole in cylinder body, especially the threaded hole of cylinder head
bolt and main bearing bolt.
The threads of cylinder head bolt is M10×1.5—6H，the threaded
hole of main bearing bolt is M12×1.75—6H。
——The installation of crankshaft woodruff key
Drive the semicircular key into key groove lightly. The
magnitude of interference for key and key groove is 0.00—0.051mm。
After the semicircular key is installed, check the protrusion height.
It should be 1.392—1.739mm.
——Crankshaft thrust washers are two pieces. They are only installed
on the front and back thrust surface of cylinder block.
Before installation, apply the engine oil on the surface with oil
groove of thrust washer. position the surface with oil groove towards
the cylinder body and the surface with oil groove towards crankshaft.
——During installing crankshaft, engine oil should be applied main
journal, connecting rod journal, thrust surface and bearing half.
——The character like 1,2,3,4,5 are casted on the top of main bearing
cap and also an arrow. During assembling, install them from the front
according to the sequence. At the same time, have the arrow pointing
to the front end surface of cylinder block. The width of main bearing
cap 1,2,4,5 is same, but the width of main bearing cap 3 is larger than
others.
The main bearing cap is retained by rabbet. It is press fit between
rabbet and cylinder body. The press fit clearance is
0.025—0.145mm. After installation, the surface of the first and the
fifth main bearing caps should be even or lower than the front and
back end surface of cylinder body.
level
The size of
cylinder body
thrust
The
size
of
crankshaft thrust
The thickness of
thrust washer
standard
24±0.03
28.825—28.875
2.326±0.025
oversize
0.38
24±0.03
29.205—29.255
2.516±0.025
T
w
o
t
h
ru
st
p
ie
ce
s
Fig. 68
CAC Gasoline Engine Maintenance And Servicing Manual
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——Nine main bearing bolts are hex head flange side bolts, and one is stud.
For horizontal engine, the stud is mounted in the left threaded hole of the
second main bearing cap (see from the front) which is for installing the
carrier of oil collector. For the vertical engine, it should be mounted on the
left threaded hole of the forth main bearing cap (see from the front).
Before installing the main bearing bolt, engine oil should be applied on
the joint surface of head end.
The main bearing bolt and stud should be screwed by hand first and
tightened to 90—100Nm.
——The max rotating torque of the crankshaft (with piston rod assembly) is
16Nm.
【12】. The removal and installation of oil baffle assembly
Removal：
——Take out the oil baffle assembly
from the right of the back end of the
cylinder body.
Installation：
——Install the oil baffle assembly from
the right of the back end of the cylinder
body (viewed from the front). The oil
baffle assembly should be tensioned. The
spring should be lower than the flange
surface of cylinder block oil pan.
Fig. 69
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
CAC Gasoline Engine Maintenance And Servicing Manual
45
2) The removal and installation of oil pan：
removal：
——Loosen drain plug and drain oil
——Loosen eighteen M6×20 bolts
——Take out the sealing gasket of oil pan
——Check if the left and right reinforced plates are still clipped on the
back face of oil pan flange face
Installation：
——Apply locite 598 sealant
and G Y409 anaerobic sealant
on the joint place between
flange surface of oil pan of
cylinder body and oil pump case,
and carrier of real oil seal.
——Put the new rubber seal
gasket on the cylinder body and
have the two sides of sealing
gasket enter into the grooves of
carrier of real oil seal and oil
pump.
——Install the oil pan with the
two sides of sealing gasket in
the grooves of oil pan.
——Screw the bolt by hand (the bolt with washer indicated
in the left upper figure is precedent.)
——Tighten bolts to 5.0—8.0Nm according to the sequence of the left
figure.
——Replace the sealing gasket of drain plug. Screw in the drain plug
by hand and tighten to 21—25Nm.
Fig. 73
A. crankshaft to oil
pump shell
B. crankshaft to rear
oil seal carrier
fig. 74
Fig.75
forward
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