Chery A11. Manual — part 21
CAC Gasoline Engine Maintenance And Servicing Manual
39
2). The removal and installation of carrier assembly of the real oil
seal:
Removal：
——Remove 4 bolts (as arrow indicates).
——Take out carrier assembly of the real oil seal
——Remove carrier sealing gasket of the real oil seal
——Use chisel or screwdriver to pry the real oil seal from the
carrier of the real seal oil. Note: please don’t damage the carrier of
real oil seal.
Installation：
——Position the carrier on the vise which is equipped with wood
on the jaw.
——Align rear oil seal carrier hole with the part number side of oil
seal outward .press oil seal into rear oil seal carrier with vise.. The
magnitude of interference for real oil seal and carrier hole is
0.26—0.50mm.
——Install new sealing gasket of real oil seal carrier .
——Install real oil seal carrier assembly. Before assembling, wrap
a piece of plastic piece on the crankshaft to avoid damaging oil seal.
At the same time, apply engine oil on oil seal edge and journal for
oil seal .
——Measure the roughness of lower oil seal carrier surface and oil
pan flange surface of cylinder block. It should be adjusted to the
range of ±0.26mm.
Fig.58
Fig.59
Fig.60
Fig.61
CAC Gasoline Engine Maintenance And Servicing Manual
40
——Tighten four M6 bolts to
8.0 —11.0Nm。
——Remove the plastic piece.
【11】. Removal and installation
crankshaft, crankshaft thrust washer, halves and main bearing cap
Removal：
——Before removing, check the end play of crankshaft first.
Use the plunger of dial indicator to contact bearing face of the crankshaft
( lightly compressing).
Push the crankshaft away from the contacting tip. Adjust dial
indicator to zero and then use post to push the crankshaft towards
contacting tip as much as possible. Check dial indicator. The reading is
end play. The end play of the crankshaft should be 0.092—0.303mm.
If dial indicator is not available, the end play of the crankshaft
may be checked by feeler leaf. Between the third main bearing cap and
crankshaft, it should be checked by feeler leaf (push and pull
crankshaft)。
——Loosen main bearing bolt and stud，(start with the middle bearing
cap), take out the bolt and stud, remove main bearing cap and the other
shell of main bearing bushings. The other shell of main bearing bushing
is still kept in main bearing cap.
——Remove the crankshaft.
——Remove the thrust plates of crankshaft (two pieces) from the
cylinder block.
Check：
——Check main journal and main bearing bushing clearance .
Clean the main journal of crankshaft, inner bore of main bearing
cap and main bearing bushings with non-woven. Put plastic
clearance gauge on the main journal paralleling with the generatrix of
main journal. Its length should be a little shorter than the width of main
journal.
Note: Don’t rotate the crankshaft!
Mount the main bearing cap. Screw the bolt of main bearing cap
by hand. Tighten to 90—100Nm. Don't rotate the crankshaft.
Remove main bearing bolt. Take out the main bearing cap
Fig. 62
Fig.63
Fig. 64
Sealing plate
M6 bolt×20（4）
Tighten torque 8~11Nm
Fig.62
CAC Gasoline Engine Maintenance And Servicing Manual
41
carefully. Arrange them according to the sequence. Read the bearing clearance
according to the proportion stated in the cover of plastic clearance gauge.
Check the bearing clearance from the third main bearing and extending to the
two sides. The clearance of main bearing is 0.011—0.058m m.
——Check clearance of connecting rod bearing
Use the above method to check clearance of connecting rod bearing.
Clearance of connecting rod bearing is 0.006—0.06mm.
——The size of connecting rod journal and connecting rod
bushing： unit：mm
——The size of main journal and main bearing half：
unit：mm
Level
The diameter of connecting
rod journalφ
The thickness of
connecting rod
bushing
standard
47.89—47.91
1.480—1.487
u
ndersize 0.025
47.89—47.91
1.492—1.499
undersize 0.25
47.64—47.66
1.605—1.612
undersize 0.5
47.39—47.41
1.730—1.737
undersize 0.75
47.14—47.16
1.855—1.862
undersize 1.0
46.89—46.91
1.980—1.987
Level
The diameter.
of main
journal
The diameter of
main bearing bore
of cylinder body
The thickness
of main
bearing half
shell
Standard
57.98—58.00
62.2935±0.0065
2.131—2.138
oversize 0.4
57.98—58.00
62.6935±0.0065
2.331—2.338
undersize
0.002
57.98—58.00
62.2935±0.0065
2.141—2.148
undersize 0.25 57.73—57.75
62.2935±0.0065
2.256—2.263
undersize 0.50 57.48—57.50
62.2935±0.0065
2.381—2.388
undersize0.75
57.23—57.25
62.2935±0.0065
2.506—2.513
undersize 0.25
oversize 0.4
57.73—57.75
62.6935±0.0065
2.456—2.463
undersize 0.50
oversize 0.4
57.48—57.50
62.6935±0.0065
2.581—2.588
undersize 0.75
oversize 0.4
57.23—57.25
62.6935±0.0065
2.706—2.713
Fig.65
Fig. 66
Fig. 67
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
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