Chery S11 / Chery QQ. Manual - part 242

 

Chery  QQ  Maintenance Manual         465 Engine Mechanical System

            

         

Symtom 

Cause of malfunction/Troubleshooting 

There is some knocking 

sound while starting ,but 

only continue several 

seconds. 

Oil viscosity is not suitable. 

Use suitable oil viscosity according to estimated 

temperature,see the maintenance and lubrication for 

reference. 

Cold start knocking,continue 

2-3 minutes. 

Engine cold start pinking sound usually disappears when 

the specified cylinder secondary ignition circuits connect 

the ground.Check the engine to see if it is under the 

following circumstances: 

 

Crankshaft balancer or drive pulley is loose or 

broken. 

 

Tighten or replace parts if necessary 

 

Clearance of piston and cylinder liner is too big. 

Check the parts of piston, replace if necessary 

 

Connecting rod is bent 

 

Knocking noise while idling 

heat start 

Check the engine to see if it is under the following 

circumstances: 

 Driving belt wear   

 Check tension , replace driving belt if necessary. 

   The compressor of air condition system 

   Replace parts if necessary . 

 Oil viscosity is not suitable. 

 Use oil with suitable visocosity according to 

estimated temperature,see maintenance and 

lubrication for reference. 

 Piston pin clearance is too big. 

 Replace piston and piston pin if necessary. 

 Calibrate location of connecting rod 

 Check connecting rod,replace if necessary. 

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Chery  QQ  Maintenance Manual         465 Engine Mechanical System

            

         

 Clearance of piston and cylinder liner is not enough. 

 Bore cylinder , install new piston 

 Adjust looseness or torque of crankshaft balancer. 

 Replace damaged parts   

 Make sure that the direction of piston pin is right. 

 Install piston correctly. 

Slight pinking sound while 

heat start. 

Check to see if the engine is under the following 

conditions: 

 Detonation or ignition knock 

 See engine control system for reference. 

 Exhaust manifold leak gas. 

 Fasten bolt or replace gasket 

 Clearance of connecting rod bearing is too big. 

 Replace connecting rod bearing if necessary 

Severe knocking sound 

while increasing the torque. 

Check to see if the engine is under the following 

circumstances: 

 Crankshaft balance or pulley nave is broken. 

 Replace parts if necessary 

 Transmission belt of auxilary is too tight or there are 

some scratching marks on it.

 

 Replace driving belt if necessary 

 Flywheel is broken. 

 Replace flywheel 

 Clearance of crankshaft main bearing is too big. 

 Replace parts if necessary. 

 Clearance of connecting rod bearing is too big. 

 Replace parts if necessary 

 
 
 
4 Diagnosis of driving belt noise 

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Chery  QQ  Maintenance Manual         465 Engine Mechanical System

            

         

 

Step Operation 

Yes 

No 

The following circumstances indicate that there is whispering noise: 

 

There is a high pitch noise when drive belt or pulley rotate every circle. 

 

It usually happens in cold and damp morning. 

 

Sprinkle some water on the drive belt for confirmation,the noise should stop 
immediately. 

1 

Check to see whether or not the pulley is 
malposition. 
Check to see if there are any pulleys are 
malposition? 

To step2 

To step3 

2 

Fix position of the pulley which is malposition 
once again,to see whether or not there is still 
any whispering noise? 

To step3 

System normal 

3 

Check to see whether or not the bracket is bent 
or broken. 
Are there any bent or broken bracket? 

To step4 

To step5 

4 

Replace the bent or broken bracket   
Is there any whispering noise? 

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 

System normal 

6 

Fasten any loose fasteners. 
Lost fastener should be replaced immediately. 
See the specification of fastener for reference. 
Is there still any whispering noise? 

To step7 

System normal 

7 

Check to see whether or not the pulley flange is 

bent. 

Is there any bent pulley flange? 

To step8 

To step9 

8 

Replace belt. 
Is there any whispering noise? 

To step9 

System normal 

9 

Check to see if there are severe hollowness 
exceeding 1/3 depth of the belt groove. 
Is there any severe hollowness? 

To step10 

— 

10 

Replace driving belt. 
See the “Replacement of driving belt” for 
reference. 

— System 

normal 

 
 
 
 
 
 
 

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Chery  QQ  Maintenance Manual         465 Engine Mechanical System

            

         

 
5 Screaming noise of driving belt 
 

Step Operation 

Yes 

No 

Defination: The following circumstances indicates there are some screaming noise. 

 

Sharp noise usually happens in the multi-rib driving belt result from driving belt 
slipping. 

 

Blocking or sliding phenomenon of A/C system compressor connecting throttle 
happens when driving belt is overloaded,there is some noise. 

1 

Check to see whether or not the pulley is 
malposition. 
Is there any malposition pulley? 

To step3 

To step2 

2 

Check to see whether or not the length of driving 
belt is correct. 
See “Replacement of driving belt” for reference. 
Is the length of driving belt is correct or not? 

To step4 

To step5 

3 

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

System 

normal 

— 

4 

Make a test to see whether or not the tensioner 
works normally. 
Does the driving tensioner work normally? 

To step3 

To step5 

5 

Check to see whether or not the size of pulley is 
correct. 
Check to see if the size of all pulley is correct or 
not. 

To step6 

To step3 

6 

Check to see if the bearing is blocked badly or 
whether or not there are some blocked bearing. 

To step3 

System normal

 
6 Hooting noise of driving belt   
 

Step 

Operation 

Yes 

   No 

Defination: Successive high pitch noise can be generated because of bearing malfunction.

1 

Check to see whether or not there is some damage 
of accessories bearing. 
Is there any noise resulting from the bearing? 

To step2 

System normal

2 

Install new parts according to the request. 
Is the maintenance completed? 

System 

normal 

— 

 
 
 
 
 
7 Rumbling noise of driving belt 

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