Chery SQR 7160 sedan. Manual — part 30
CAC Gasoline Engine Maintenance And Servicing Manual
38
Installation of the piston and rod assembly：
Apply engine oil on piston, piston ring and cylinder bore.
Stagger 120°among the first compression ring, the second ring
and oil ring cotter, then install piston rod into cylinder bore. push
the piston an rod assembly by hammer into the cylinder bore.
——Apply engine oil on the connecting rod bushing. Mount
connecting rod cap. Retain connecting rod body and cap with two
elastic retaining pins.
——Tighten connecting rod bolt to 30—36Nm. apply engine oil
on the bolt head and bolt threads before installation.
——The side play of big end is 0.092—0.268mm。
【10】The removal and installation of flywheel assembly and
carrier assembly of real
crankshaft oil seal
1). The removal and installation of flywheel assembly
removal：
——Remove six M10 bolts and replace bolts.
——Remove flywheel. Check if there is crack in the
surface of clutch plate. Check ring gear teeth for
crack ,wear, pitting .
Installation：
——The press fit clearance of gear ring and flywheel is
0.48—0.86mm. The gear ring should be pressed when
heated to 300℃.
——The retaining hole of flywheel and the retaining
journal of crankshaft is of clearance fit. clearance is
0.012—0.074mm. Try to push it lightly after centering.
Don’t strike the crankshaft by the hammer.
——During assembling, align the installation mark hole
and fabrication hole on the crankshaft. Screw in 6 new
bolts by hand. Bolts should have sealant on them.
Tightening torque is 82—92Nm.
Fig.56
Fig.57
gage hole
Install mark bore
Flywheel
assembly
Retaining
pin
CAC Gasoline Engine Maintenance And Servicing Manual
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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
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——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
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