Chery S11 / Chery QQ. Manual — part 249

Chery QQ Maintenance Manual 465 Engine Mechanical System

Chapter 10 Rplacement of

1 Steps of removal
See content of relevant chapters for
reference
1. Take off cylinder head accordingly.
2 Wipe residue and dust of cylinder head
away with rag.
3 Loosen the oil drainage bolt of oil pan to
let oil drop out.
4 Take off oil pan

- 29 –

5 Take off oil pan gasket.
6 Disconnect the connecting rod bearing
cover and bearing.
Notice: Ensure bearing and bearing cover of
every connecting rod being in
correspondence with each other.
7 Take the piston connecting rod assembly
off the cylinder.
8 Put the piston on SST, take off piston pin
from assembly with remover.
9 Remove connecting rod from piston.
10 Measure the distance between piston and
cylinder
standard:0.040-0.050 mm
Notice: It is necessary to prepare enlarged
standard sized piston of 0.25 mm and 0.50
mm.
2 Procedures of installation
1 Install connecting rod to piston
2 Install piston and piston pin according to
the following steps:
Heat the connecting rod in piston pin hole at
the temperature between 280℃ and 320℃,it
is best for you to put the rod in the oil to
carry out this procedure,cool the piston pin
in dry ice, tighten the heated connecting rod
with pincer pliers
3 Install one side of piston pin by means of

Piston

making the piston lean agaist the connecting
rod,then stuff the piston pin properly with
SST,you must make sure the installation of
piston pin ring is correct.
4 Connect connecting rod assembly to
cylinder body with SST, arrow head of
piston should face the front side of engine.

Chery QQ Maintenance Manual 465 Engine Mechanical System

Notice: Put oil to surface of piston ring and
cylinder hole,at the same time,install
connecting rod.
6 Install connecting rod upper bearing
halfshell, put oil only on the side which is
facing the crank, push the connecting rod
until it is in the right position of the crank.
7 Install connecting rod cap on the lower
bearing halfshell,put oil on the side which is
facing the crank for lubricating.

- 30 –

8 Put new bolt on the connecting rod ,it is
not necessary to screw the bolt
9 Rotate the crankshaft for several
circles,make alignment of the connecting
rod totally,then tighten the connecting rod
bolt and fix the connectingt rod bolt.
27.46-31.38 N.m
10 Install oil pan, you shall be sure to keep
in mind to use fixing glue for tightening the
oil pan bolt 10N.m
11 Install oil drainage bolt
12 Install cylinder head accordingly
Notice: Use oil of SAE 10W30 for the
engine.
3 Replacement of piston ring
Steps of removal
1 Take the connecting rod assembly of the
piston away accordingly
2 Take piston ring out.
3 Clean the smooth surface of piston, get rid
of the grease remained in pin hole and
fillisters with suitable knife.
Check and measure
1 Check stem of fillisters of the piston or
skirt of the piston to see whether or not
there are some fractures.
2 Check piston ring
3 Check piston crown to see whether or not
there are some deformation,damage or rust.

4. Put the clip spring in the cylinder and use
the piston to push it in cylinder wall at a
bank angle of 90 degree,in accordance with
corresponding measured distance between
piston ring ends.

Item

Standard Limit

No.1

0.03～

0.07 ㎜

0.12

㎜

Inside

Ring

gap

No.2

0.02～

0.06 ㎜

0.10

㎜

5 Install the piston ring on the piston
according to the sequence of location of
clearance,that is to say the split of every
ring should be staggered at a angle of 180
degrees.
6 Measure the distance between ring and
groove of ring to see whether or not the
following data is true:
upper comperession ring 0.05mm
lower comprssion ring 0.04mm
7 Measure the distance between piston ring
end,put the piston in the cylinder hole,push
it to the bottom of cylinder,it is necessary to
replace the piston ring if the measuring
value exceed the limit.
Procedures of installation
Install the piston accordingly

Item

Standard

(mm)

Limit

Air
ring

0.15-0.35 0.7mm

Piston ring
Open
gap

Oil
ring

0.30-0.90 1.8mm

Chery QQ Maintenance Manual 465 Engine Mechanical System

CHAPTER 11 Replacement

1 Steps of removal

- 31 –

1 Take off timing gear of camshaft, shown
as the illustration.
2 Take off crankshaft timing gear.
3 Take off set bolt of timing belt rear cover.
4 Take off rear cover of timing belt.
5 Take the oil drainage bolt of oil pan away
and let oil flow out.
6 Remove oil pressure indication switch.
7 Remove exhaust pipe.
8 Remove oil pan.
9 Take suction oil pipe of oil pump away.
10 Remove the oil pump by means of
loosening the bolt of oil pump.
11 Remove oil pump head.
12 Take off inside teeth gear.
13 Take off outside teeth gear.

2 Inspection of oil pump
Standard of radial clearance between inside
wheel gear and crescent caliper: 0.60～
0.80mm
Standard of radial clearance between ouside
wheel gear and crescent caliper: 0.25～
0.40mm
Outside wheel gear and pump body
clearance
limit：0.3mm

of Oil Pump

Chery QQ Maintenance Manual 465 Engine Mechanical System

Side clearance

- 32 –

Use thickness gauge,make sure the side
clearance,in accordance with data between
thickness gauge and gear,shown as blow:
limit：0.17mm

3 Installation of oil pump

Parts of resolution should be cleaned,

you should satisfy the following requests
when installing the oil pump:
1) There is a dot mark ① on the outside
wheel gear.The dot mark should face
outwards when installing the outside wheel
gear to the pump body.Shown as blow:
2) You should use new sealing gasket when
installing the oil pump to the
crankcase.You should smear the
HZ-1213,sealing agent.The surface should
be cleaned before you smear.
Notice: You should lubricate the oil seal
mouth before installation.

4 Steps of installation
1 Install oil pump and tighten bolt
2 Install oil pump suck oil pipe and make it
fastened.
3 Install oil pan and oil drainage bolt
4 Install exhaust pipe
5 Install oil pressure switch and tighten it.
6 Install timing belt rear cover
7 Install crankshaft timing gear
8 Install camshaft timing gear according to
the illustration.
Attention: Align the oil level,fill SAE 10 W
30 oil in the engine.