Chery S11 / Chery QQ. Manual — part 243

Chery QQ Maintenance Manual 465 Engine Mechanical System

Step Operation

Yes

No

Defination: Low and deep slapping noise may be resulted from malposition of driving belt.
This kind of noise happens while idling cold start.
One low-frequency noise can be heard when the driving belt rotate every one circle.

1

Check to see whether or not there is any severe hollowness.
Is there any severe hollowness exceeding 1/3 depth of the belt
rib?

To step2

System

normal

2

Clean pulley of driving belt.
Is the maintenance completed?

System

normal

To step3

3

Install new driving belt,see “replacement of driving belt” for
reference.
Is the maintenance completed?

System

normal

—

8 Diagnosis of driving belt vibration

Step Operation

Yes

No

Defination: Vibration has something to do with the engine speed,vibration may be sensitive
to the accessories load.

1

Check to see whether or not the driving belt is wear,damaged,
accumulated dusts or losing reinforcement.
Is there any damage or wear of the driving belt?

To step2 To step3

2

Replace the parts accordingly,see the replacement of
transmission belt” for reference,do you finish the
maintenance?

To step3

—

3

Check to see whether or not the fastener is loose or lost.
Is there any loose or lost fastener?

To step4 To step5

4

Fasten it or replace new parts according to the actual request.
Is the maintenance completed?

System

normal

—

5

Check to see whether or not the pulley is damaged or bent.
Is there any damage of driving belt?

To step6 To step7

6

Repair it or replace with new parts.
Is the maintenance completed?

System

normal

—

7

Check to see whether or not the tensioner works normally.
Does the tensioner work normally or not?

To step9 To step8

8

Replace it accordingly,see “Replacement of tensioner of
driving belt” for reference.
Is the maintenance completed?

System

normal

—

9

Check to see whether or not the bracket is loose,bent or
broken.
Is there any loose or bent or broken bracket?

To

step10

System

normal

10

Repair it or replace bracket if necessary.
Is the maintenance completed?

System

normal

—

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Chery QQ Maintenance Manual 465 Engine Mechanical System

9 Diagnosis of belt out of position

Step Operation

Yes

No

Defination:The following circumstances may result in driving belt out of position.

1

Check to see whether or not the pulley is
malposition or bent。
Check to see whether or not the pulley is
damage.

To step2

To step3

2

Replace pulley of malposition or being bent.
Is the driving belt out of position or not?

To step3

System normal

3

Check to see whether or not the bracket is bent
or broken。
Is there any bent or broken brackets?

To step4

To step5

4

Replace the damaged bracket.
Is the driving belt out of position or not?

To step5

System normal

5

Check to see whether or not the fastener is
loose or lost.
Is there any loose or lost fasteners?

To step6

To step7

6

Replace lost fastener , fasten it according to the
regulations.
See “Specification of fastener” for reference.
Is the driving belt still out of position or not?

To step7

System normal

7

Check to see whether or not the pulley of power
streering-wheel pump is malposition。
Is the pulley of power steering-wheel pump is
malposition or not?

To step8

To step9

8

Realign or replace pulley of power
streering-wheel pump，
See “Replacement of pulley of power
streering-wheel pump” for reference.
Is the driving belt still out of position or not?

To step9

System normal

9

Check to see whether or not the transmission
belt is damaged。
Is the driving belt damaged or not?

To step10

To step11

10

Replace driving belt
Is the driving belt still out of position?

To step11

System normal

11

Check to see whether or not the tensioner of
driving belt works normally.
Is the operation of tensioner of driving belt
normal or not?

– To

step12

12

Replace the tensioner of driving belt,see
“Replacement of tensioner of driving belt” for
reference.
Is the driving belt still out of position?

– System

normal

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Chery QQ Maintenance Manual 465 Engine Mechanical System

10 Diagnosis of driving belt severe damage and wear

Step Operation

Yes

No

Defination: Driving belt outside reinforcing rib wear results from installation of driving belt is
not correct.

1

Check to see whether or not the reinforcing
driving belt accord with the guide of pulley?

— To

step2

2

Replace the driving belt.
See “Replacement of driving belt” for
reference.
Is the maintenance completed?

System normal

—

11 Diagnosis of engine misfire

Check Operation

The following diagnosis touches upon the common problems or possible causes.
You can fix a breakdown through adjustment and maintenance or replacement according to the
request,after carrying out the correct diagonosis.
This malfunction diagonosis schedule wll be helpful for diagonosing engine misfire resulting
from machenism problems such as camshaft malfunction,bearing wear or being damage and
connecting rod being bent.

This schedule doesn’t include the driving elements malfunction such as injectior malfunction.
Check the motive system inside diagonosis system
You should check the initial information first,then contrast the specified classification while
carrying out the basic diagonosis of engine misfire according to this schedule.

Initial check

Check the following conditions with eyes:

Engine flywheel or crankshaft pulley looseness or installation is not
correct.

There are some damaged or malpositioned parts of driving system.

2 Listen to the inside of engine to see whether or not there is any abnormal
noise.
3 Check to see whether or not the oil pressure of engine is suitable
4 Check to see whethr or not the oil consumption is too much.
5 Check to see whether or not the coolant consumption of engine is too
much.
6 Do compression test for the engine.

Inlet manifold leak

Inlet manifold which generates vacuum leakage will cause misfire of
engine
Check the following conditions:

Vacuum hose pipe installation is not correct

There are something wrong with the inlet manifold or gasket or
installation is not correct

There are some cracks or damage in the inlet manifold,throttle or
gasket installation is not correct.

Inlet manifold warp

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Chery QQ Maintenance Manual 465 Engine Mechanical System

The sealing surface of cylinder head warp or being damaged.

Coolant

consumption

Coolant consumption may be but not certain result in engine over heated
Check the following circumstances:

Coolant leak

Cylinder head gasket fault

Cylinder head warp

There are some cracks on the cylinder head.

Engine body is damaged.

The length of cylinder head bolt is not correct.

Fuel consumption

1 Fuel consumption may be but not certain result in engine misfire.
2 Remove spark plug and check to see whether or not there is any oil
fouling in the spark plug.
3 Carry out cylinder pressure test or cylinder leakage test.
4 Check the following conditions if the cylinder pressure test shows that
there is any damage of throttle or throttle guide:

Oil flinge wear,chip or installation is not properly.

Valve guide wear

Valve stem wear

Valve or valve seat wear or burnt.

5 Check the following conditions if the test indicating piston ring wear or
being damaged:

Piston ring fracture or installation is not correct.

End clearance of piston ring is too big.

Bore wear or taper is too big.

Cylinder is damaged.

Piston is damaged.

There is some
abnormal noise
inside the engine.

1 Make sure if the noise accords with the rotional speed of crandshaft or
camshaft while the engine is working.
2 The timing lamp sounds twice every flash ,that is the rotational speed of
crandshaft;the timing lamp sounds just once every flash ,that is the
rotational speed of camshaft.
3 Check the following circumstance if the noise is the same as the
frequency of camshaft rotational speed:

Valve device missing or loose.

Valve rocker wear or looseness

Malfuction of valve spring

Valve being bent or being burnt

Cam of camshaft wear

Check to see if timing belt or pulley wear or being damaged.

4 Check the following conditions if the frequency of knock is the same as
the crankshaft rotional speed:

The main bearing of crankshaft or connecting rod bearing wear

Piston or cylinder wear

Piston or piston pin wear

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