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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