Chery S11 / Chery QQ. Manual — part 250

Chery QQ Maintenance Manual 465 Engine Mechanical System

Chapter 12 Replacement of Rear Oil Seal of Engine Flywheel and

Crankshaft

1 Steps of removal

1 Disconnect the transmission assembly,see the relevant explanation of Chapter7.
2 Start ring gear, lock-up flywheel.
3 Disconnect clutch,see the relevant explanation of Chapter 7
4 Take off bolt and flywheel.
5 Remove bracket bolt of crankshaft rear oil seal.
6 Take off oil seal, install new oil seal.
7 Notice: Smear the oil on the mouth of oil seal lip when installing the new oil seal,be
careful of installation.

2 Steps of installation

1 Install new rear oil seal of crankshaft.
Attention:
Smear Silicon oil on the sealing surface of new sealing washer,then fix it on the shield,in
order to prevent the sealing surface from being damaged,you should turn the sealing washer
into the shield,place the shield on the crankshaft jounal and press it to be flat,place the press
cover pipe on the shield and press the sealing washer until it is aligned with the cylinder
block side.
2 Clean the contact surface of crankshaft and flywheel
3 Install flywheel, tighten bolt
4 Install the cluth,see the relevant explanation of Chapter 7 for reference.
5 Install engine and transmission,see the relevant explanation of Chapter 7 for reference.

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Chery QQ Maintenance Manual 465 Engine Mechanical System

Chapter 13 Replacement of Crankshaft

1 Steps of removal

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Chery

1 Remove engine and transmission
assembly from vehicle
2 Remove transmission from engine , put it
on the bracket.
3 Remove oil drainage bolt of oil pan to
drain oil and collect the oil.
4 Remove engine oil pan.
5 Remove oil pump,see the accordingly
explanations.
6 Remove engine clutch.
7 Remove engine flywheel.
8 Make mark for main bearing and
connecting rod bearing.
9 Loosen connecting rod bolt and remove
connecting rod bearing cover.
10 Loosen main bearing bolt and take off
bearing cover.
11 Take off crankshaft.
12 Take off upper main being halfshell.
Attention:Don’t confuse the bearing
halfshell.

2 Clean and check
1 Clean the parts and dry the parts.
2 Check to see whether or not there are
some defects such as scoring,unevenness or
others in the journal.

3 Measurement
1 Check the flatness of crankshaft according
to the following methods.
2 Lift the crankshaft with 1 and 5 bearing
with halfshell of engine block.
3 Install a dial gauge with touching pin on
the place of 3 in the bearing,total reading is
µm ,the maximum is 0.03 mm
Maximum taper of observing journal can
be:0.005 mm,Maximum roundness of
observing jounal can be:0.004 mm
4 Observe journal and diameter of
crankshaft and check to see which is ok,if
the value of diameter is not in the scope of
the form,you should polish the crankshaft
once more or replace the crankshaft.
5 Please use plastic clearance torque,if you
want to check the distance between the
bearing and halfshell.
6 If there is no plastic clearance gauge,take
away the crankshaft, put on the bearing
cover with halfshell and diameter of
corresponding journal .Difference between
the two values is the distance between
journal and halfshell.

Chery QQ Maintenance Manual 465 Engine Mechanical System

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4 Steps of installation
1 Install upper shoe of main bearing to
engine cylinder,lubricate the side which
face the journal.
2 Install crankshaft to engine body
3 Install the main bearing cover with bottom
shoe,lubricate the side facing the journal.
Attention:Installation of bearing cover
should be in accordance with the mark made
when dismantling.

4 Install main bearing bolt,don’t fasten it
5 Knock the two ends of crankshaft with a
plastic rod,mainly in order to adjust the rear
surface of thrust bearing, then fasten the
bolts.

5 Measurement
1 Measure axial clearance of crankshaft as
the following method.
2 Install a dial gauge with sensing pin and
the sensing pin contact crankshaft end face.
3 Move the crankshaft along its direction
with a screwdriver,pay attention to the
readings of dial gauge,the regulated
clearance is :0.13-0.28mm.
4 Install connecting rod to crank
Notice:Use lubricant only on the side facing
the crankshaft handle when install the
halfshell of connecting rod bearing,push the
connecting rod until it is in the position of
crank.
5 Lubricate the surface of lower halfshell of
crank facing the crankshaft,when installing
the connecting rod bearing cover.
6 Install connecting rod bearing cover
bolt,but don’t fasten it.
7 Turn the crankshaft for several
circles ,make alignation.
8 Install engine flywheel and bolt,see the
relevant Chapters.
11 Install clutch.
12 Install the oil pump ,see the explanation.
13 Install the engine oil pan,see the
explanation.
14 Tighten oil drainage bolt,see the
explanation.
15 Install the transmission to the engine,see
Chapter 7.
16 Install engine and transmission to
vehicle,see the explanation.

Chery QQ Maintenance Manual 465 Engine Mechanical System

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Chapter 14 Replacement of

1 Steps of removal
1 Remove engine from vehicle accordingly.
2 Fix the engine assembly on the bracket.
3 Take off the piston and connecting rod
assembly of engine accordingly.
4 Take off crankshaft.
5 Clean the engine block thoroughly.
6 Check to see whether or not there are
some cracks or wear in the engine block.

2 Repair cylinder
If cylinder block of engine can be still used
while there are something wrong with the
cylinder after inspection,so you can repair
the cylinder by means of polishing the
inside .After performance of polishing the
cylinder,the cylinder shall be able to have a
capacity of larger piston.
Polishing of cylinder
Notice: Some of above-mentioned
procedures can be omitted ,judgement of
necessity depends on result of inspection
before repair.
You must use fine hone stones to polish the
cylinder after ginding,you use rough
particles stones first,then use fine particles
stones,it is not good to make the polishing
too smooth,it only needs slight smoothness
for helpful lubrication.
Put the hone stone in the cylinder and make
the hone stone close to the cylinder wall as
possible as you can,you totate the hone

Engine Block

stone around,connect a 19mm electric drill
to the stone,make the stone rotating inside
the cylinder,make the stone turning up and
down slowly to the full unitl it can rotate
freely.
Put appropriate amount of kerosene in the
cylinder in order to keep the hone stone and
cylinder wall clean and lubricated,continue
to polish it and repeat the procedures until
you get requested diameter.
Notice: Stop polishing frequently to put the
piston in the cylinder to check whether or
not the distance is appropriate,clean the
cylinder thoroughly before putting the
piston in.
The engine block should be cleaned
thoroughly after repair.

3 Steps of installation
1 Install the crankshaft accordingly.
2 Install transmission rod of piston
assembly accordingly.
3 Install engine assembly to the vehicle
accordingly.