Chery S11 / Chery QQ. Manual - part 244

 

Chery  QQ  Maintenance Manual         465 Engine Mechanical System

            

         

 

Malfunction of connecting rod. 

 

There is too much Carbon deposit on piston crown 

There is no 
abnormal noise 
inside the engine. 

1 Check to see if the timing belt or pulley is wear or installed not properly.
2 Remove valve rocker cover of engine side whose cylinder is misfiring. 
3 Check the following conditions: 

 

The bolt of valve rocker is too loose 

 

Push rod is bent 

 

Malfunction of valve spring   

 

Valve wear or installation is not good.   

 

Cam of camshaft wear 

 

4 Fuel consumption 

1 General description 
Fuel consumption of engine referrs to amount of fuel used,never to confuse fuel 
consumption and oil leakage of oil pan and cylinder head. 
Engine fuel is used for: 
1.1 Depart the contacting surface away with fuel film,prevent dry friction. 
1.2   Conduct heat generated from friction 
1.3   Bring the residue after burning away. 
It is necessary to consume certain amount of fuel in order to achieve above-mentioned 
aims,in other words,it is not realistic to find a engine without fuel consumption.Generally 
speaking,amount of fuel used is small,it is ok to add a little fuel during the period of 
replacing oil,even through you may not add the oil.Of course,you must add the oil if fuel 
level is lower than the minimum mark of fuel consumption indicator.Meanwhile,you should 
make sure that fuel level is not higher than maximum mark, otherwise oil consumption will 
be more. 
Generally speaking,fuel consumption becomes stable after the vehicle driving several 
km,therefore,fuel consumption measurement shall be carried out after vehicle driving 7500 
km.Before measurement,you should make sure that the engine doesn’t lose fuel because of 
leakage. 
Dipstick is used only for the purpose of inspection not for measurement.The engine must be 
turned off at least 2 minutes before checking oil level,it may be the cause of manufacturing 
tolerance if you add enough oil but the level is not reaching the maximum.It shows that fuel 
is overused if vehicle driving 100 km consuming more than 0.075 L fuel,causes and 
solutions of fuel being overused are introduced as follows: 
● Fuel consumption indicator doesn’t have good function.Please make vehicle level,check 
oil level and spend some time to make the oil subside. 
● Oil viscosity is not suitable.Please use recommended SAE according to local temperature. 
● Successive high-speed driving 
● Heavy load drawing,such as towed vehicle.Please decrease oil milage . 
● The performance of ventilation system of crankcase is not effecive. 
● Oil leak.Please fasten bolts if necessary,replace gasket and seal gasket if necessary. 
● Valve guide or oil seal wear or lost.Please install enlarge sized valve and/or new oil seal. 

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Chery  QQ  Maintenance Manual         465 Engine Mechanical System

            

         

● Piston ring fracture or wear 
● Piston ring or seat is installed not properly or correctly 
● Installation or assembly of piston is not good. 
● Cylinder head gasket and oil outlet hole is blocked. 
 
2 Measuring method of fuel consumption 
2.1Make vehicle level when checking,fuel temperature of engine is not less than 80 ℃. 
2.2 Make engine idling before draining the engine fuel. 
2.3 Turn off the engine immediately after drainage ,record the drainage time (3 minutes) 
with chronograph,test should show that drainage should be completed within 3 minutes. 
2.4 Displace fuel to state of guttate. 
2.5 Cool the engine fuel of displacement to 20 ℃ for 1 to 2 hours. 
2.6 Measure fuel amount after cooling with measuring cylinder.Refill enough new fuel 
accordingly.You should subtract 0.25 litre fuel because the fuel filter is not replaced. 
2.7These fuel is enough for the driver to drive at least 500 km/350 miles.The driver should 
keep his/her own normal rount and driving style. 
2.8 Repeat above-mentioned procedures from 1 to 4 afterwards,drainage time is the same. 
2.9 Consumption amount of fuel in measuring tube is fuel consumption or mileage   
consumption of engine. 
 
3.      Diagnosis and test of fuel pressure 
The following conditions may cause low temperature of fuel or fuel without pressure.If fuel 
level is too low,fill the fuel to the fuel level of the indicator. 
Oil pressure switch is not correct or the performance is not good.Please replace the switch. 
Fuel viscosity is not correct or fuel being diluted 

-  Please use new fuel with suitable viscosity according to estimated temperature. 
-  Please use new fuel if the old one being diluted. 
-  Oil pump wear or too dirty ,clean or replace the oil pump. 
-  Oil filter is blocked.Please replace the oil filter. 
-  There are some holes in the connecting rod oil dipper.Please replace the connecting 

rod oil dipper. 

-  There are too much clearance between the bearings.Please replace the bearing. 
-  There are some holes in the passage or the passage being blocked.Please repair or 

replace the engine block. 

-      Vitta hole plug lost or not properly installed.Please install or maintain it if 

necessary. 

-      Pressure regulating valve is blocked.Please check the pressure regulating valve to 

see whether or not it is blocked in the hole,check to see whether or not there are 
some scores and fins in the hole. 

-      Valve guide wear.Repair if necessary. 

3.1 Start the engine under the running temperature of more than 80 ℃. 
3.2 Take off the oil pressure switch. 
3.3 Oil pressure test,see the arrows in screw hole. 
3.4 Measure oil pressure 0.294-0.539 Mpa (3000 r/min) 

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Chery  QQ  Maintenance Manual         465 Engine Mechanical System

            

         

3.5 Take off oil manometer and adaptor. 
3.6 Install oil pressure switch properly. 
3.7 Fill enough fuel to maximum of fuel gauge. 
Notice: Fuel temperature is decided by corresponding engine load,the temperature can be 
150 ℃ under extremely heavy load. 

 

 

 

5  Diagnosis of oil leakage 

Maintain,replace the parts or seal the gasket surface after finding out the leak position before 
maintenance. 
1 Determine the leakage fuel whether or not are listed as follows with eyes: 
● Engine fuel 
● Transmission fuel 
● Power steering liquor 
● Brake fluid 
● Other oil or liquor 
Check with eyes: 
1 Make vehicle temperature normal. 
2 Park the vehicle on a big and clean surface,wait a minute,check to see if there are some 
leaking drops. 

3Identify classification of leakage and possible positions. 

4 Check the suspicious position with eyes,use a mirror if necessary. 
5 Check the joint or parts which are damaged to see if there is some leakage. 
6 Continue according to the following procedures if you can not make sure the leakage 
position. 
(1) Completely clean the whole engine and its surrounding parts. 

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Chery  QQ  Maintenance Manual         465 Engine Mechanical System

            

         

(2) Drive the vehicle for several miles at different speed under normal temperature. 
(3) Park the vehicle on a big and clean surface. 
(4) Wait a minute,check to see if there are some leaking drops. 
(5) Idenitify classification of drops and possible position of leakage. 
(6) Check suspicious position with eyes,use a mirror if necessary. 
(7) Judge the possibility of leakage. 
Adopt powder method if you can not make sure the cause of leakage yet. 
2 Powder 

method 

2.1 Completely clean the whole engine and its surrounding parts. 
2.2 Smear children’s talcum powder on the suspicious position. 
2.3 Driving vehicles for several miles at different speed under normal temperature. 
2.4 Identify classification of fuel,make sure the possible position of leakage, in accordance 
with powder changing color position. 
2.5 Check the suspicious positions with eyes,check the position not easy to see ,with the help 
of a mirror. 
2.6 See the possibilities of leakage for reference if necessary. 
3 Possibilities of leakage. 
Check vehicle to see whether or not it is under the following conditions: 
● Surface of liquor is higher than the recommended level. 
● Pressure of liquor is higher than the recommended pressure. 
● Oil filter core or pressure by-pass valve is blocked or the performance is not good. 
● Ventilation system of engine is blocked or the performance is not good. 
● Fastner is not good or damaged. 
● Parts fracture or there are some holes in the parts.. 
● Installation of sealing agent or gasket is not good. 
● Gasket and oil seal is damaged or wear. 
● Seal surface is damaged or wear. 
 
 
 
 
 
 
 
 
 
 
 
 

chapter 3    Assembly Outline Illustration 

1 Front end view of engine 

 

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