Engine 2.0 (Chery Fora, A21). Manual - part 7

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f:

 

Examine the protruding capacity of 
valve stem. 

And Examine the protruding high of valve 

stem with vernier caliper.

（See picture） 

 

Standard Value

（mm）

Protruding Capacity 

Of Intake Valve 

stem 

47.5 

Protruding Capacity 

Of Exhaust Valve 

stem 

47.5 

 

 

5)

 

Examine the axial clearance of camshaft. 

Replace the camshaft if the value of axial 
clearance exceeds the normal value. 

 Standard 

Value 

Intake camshaft 

0.015—0.02 

Exhaust camshaft 

0.015—0.02 

 

 

Top of Valve Stem

Protruding High of Valve Stem 

Seat of Valve Spring 

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6)

 

Examine the planeness of cylinder 

a:

 

Clear the lower surface of cylinder head. 

b:

 

With the help of ruler and feeler gauge, 
check whether the lower surface of 
cylinder head is warped.(Measure it in 
the sequence of A, C, D, E, F, G in the 
picture) 

 

 

Standard 

Value 

Cylinder head planeness 

0.04 

 

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C:

 

Revise it if the planeness exceeds, and 
replace when it exceeds the limit value. 

The permitted maximum abrading thickness 
between cylinder block and cylinder head is: 

2.2.3

 

Installation 

The installing steps are reverse to those for 
removal. 

Note: 

1)

 

Dismantle valve springs into groups. 
The 1st and 4th cylinders are in one 
group and the 2nd and 3rd ones are in 
the other group. Then put the piston to 
the upper point of 1st and 4th cylinders 
in order to dismantle the valve spring of 
1st and 4th cylinders, replace their valve 
oil seal and mount the spring 
immediately. And put the piston to the 
upper point of 2nd and 3rd cylinders in 
order to replace the other valve oil seal. 
Those steps prevent from that the valve 
falls into cylinder and the unanticipated 
trouble occurs. 

2)

 

Wipe the engine transmission oil on the 
opening of oil seal when mounting the 
valve oil seal. 

3)

 

Fasten the cylinder bolt as the following 
process. 

A:

 

Smear some oil on the top and root of 
bolt. 

B:

 

Fasten to 40±5NM in sequence. 

C:

 

Fasten 90±5 degree clockwise. 

D:

 

Fasten 90±5 degree clockwise. 

 

 

2.3 Replace thermostat 

2.3.1 Structural 

diagram 

8 

4 

1 

5 

9 

7 

3 

2 

6 

10 

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2.3.2  Needed tools and auxiliary materials 

Hatch clamp,10# sleeve, ratchet wheel and wrench 

2.3.3 Removal 

1)  Loosen the clamp of thermostat water exhaust pipe with hatch clamp to release the 

coolant. 

Note: Do it after the temperature decreased to prevent scald. 

2)  Remove the 4 bolts of thermostat cover with 10# sleeve wrench. 

3)  Take out the thermostat. 

2.3.4 Inspection 

Put the thermostat in the boiling water and use it with thermometer. Then observe the 
temperatures when the thermostat is turning on and fully opened. 

 Temperature 

value 

Regular unlocking temperature 

87  

fully opened temperature 

104  

Replace the new thermostat if the measured value is abnormal. 

2.3.5 Installation 

The installing steps are reverse to those for removal. 

Note: Fill in the engine coolant with fixed quantity after installation.

1 

2 

3

4 

5 

6 

1. Pad—Thermostat Seat 

2. Thermostat Seat 

3. Hexagonal Flange Bolt 

4. Thermostat Assembly 

5. Hexagonal Flange Bolt 

6. Cover—Thermostat Seat