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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