Chery S11 / Chery QQ. Manual — part 225

SQR7080 维修手册 372 发动机机械部分

7-4-3 Check the clearance between the pistion and the
cylinder wall
1. The postions for measuring the inner diameter of the
cylinder and the piston skirt are as shown in the right
figure. Replace and repair the piston or the cylinder
body, or bore the cyliner if the measured results exceed
the limits
[Benchmark] 0.018～0.03
[Limit] 0.10
[Reference] The clearance between the piston and the
cylinder hole is subject to the innermost diameter of
cylinder in vertical direction minus the maximum
outer diameter of the piston.
2.After the replacement of the piston or the cylinder
body, it is needed to confirm the clearance of the
replaced cylinder once again.
Datum: 0.018～0.030

7-4-4 Crankshaft
1. Check the coaxiality of the main shaft diameter
(1) Use the centi-meter to measure the coaxiality.
Replace the crankshaft if the measurement result
exceeds t he limit.
[Limit] 0.03mm
[Attention]: The bending value should be 1/2 of the
fluctuation for one circle of turning the crankshaft.

2. Check the tears and wears of the crankshaft
（

1）Use a caliper to measure the shaft diameter , and

work out the circularity and cylindricity.
[Limit] 0.005mm
(2)Use a caliper to measure the connecting rod
diameter ,and work out the circularity and cylindricity.
[Limit] 0.004mm

the measuring position is shown as the figure,

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SQR7080 维修手册 372 发动机机械部分

Frontward mark

7-4-5Assmbling of the crankshaft connecting rod
mechanism
1. Assembly of the piston and connecting rod
（

1 ） Use special tools to assemble the piston,

connecting rod and piston pin in the following
specified procedures.
①

Smear lubricating oil to the connecting rod pin

hole, and make the assembly according to the marks
for the same unit and in the indicated direction.

SST

SST

②

Use SST to make the installation shown as the right

figure.

③

Make adjustments and installation of the piston and

the connecting rod shown as the right figure.
④

After smearing lubricating oil to the piston pin, use

pressurizing device to assemble the piston and the
connecting rod.
[Attention]
· Pay attention to the assembling direction when
pressing in the piston pin;

The small bit of connecting rod should be heated to

300℃ while pressing the piston pin in the piston.

Exert pressure in the process of pressing by

assuring the alignment of the pin.

（

2）Side face with marks should be upright,install

steel belt assembly oil ring (gasket ring,down scrapter
and upper scrapter),then install the secondary ring,then
install the primary ring
Open degree of every ring is shown as the illustration:

From up to
down：
No.1 ring
No.2 ring
Oil ring

下刮片

Ring open angle： Down scrapeing

No.1 ring

No.2 ring

Gasket

Up

Up scrapeing

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SQR7080 维修手册 372 发动机机械部分

3 The crankshaft main bearing cover. Assemble the
crankshaft, shaft bush, shaft body and thruster
according to the following instructions.
（

1）The protruding thrust block on the bush should

match the groove on the cylinder body for installation..
[Attention] Use the bush made by the same
manufacturer.

Outward

（

2）Smear lubricating oil on this side (upper side) of

the crankshaft before installing it.
The side thrust chip with oil sink should face
outward (crankshaft handle) for installation on the
cylinder body bearing stand.
[Attention] Smear lubricating oil on the side of the oil
sink.

Apply oil

（

3 ） Smear lubricating oil on the friction side

opposite to the contact of the bush lower parts. Install
the parts according to the forward indiction mark on
the crankshaft bearing cover.

（

4）After applying the lubricating oil, tighten the

bolts in the sequence shown as the right figure for
2—3 cycles with the specified torque.
[Tprque] 70±3.5N.m
（

5） Rotate the crankshaft after assembling, you

should rotate it with ease,the torque should be less
than 1Nm

Attention:· The torque of crankshaft rotating should

be less than 1Nm;(The torque is for installing the
crankshaft only,not for installing the piston connecting
rod)

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SQR7080 维修手册 372 发动机机械部分

4. Assemble the piston connecting rod Ay, connecting
rod bush and connecting rod bearing cover according
to the following instructions.
（

1）The openings of the air ring and oil ring should

match the specified direction.
（

2）Use nylon sleeves for the bolts of the connecting

rod to prevent from scraping the cyliner hole and axial
diameter
（

3 ） Apply lubricating oil to the piston I, the

connecting rod and the surfaces of the other related
moving parts.

Nylon bar
SST

（

4）Make sure the frontwards indication mark on the

piston. Should be frontwards and assemble the piston
connecting rod Ay with SST.
[Attention] The cylinder number on the piston
connecting rod Ay should be identical to the cylinder
number.

Frontward

（

5）Assemble the connecting rod bearing cover and

bush according to the following instructions.
①

Smear a little lubricating oil on the bolt and screw

nut stand before they are mounted according to the
indication mark.
②

Tighten the left and right screw nuts alternately for

a couple of times with the specified torque.
[Torque]： 40±2N.m
[Attention] The connecting rod and the rod bush
should be bought from the same supplier.

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