Chery S11 / Chery QQ. Manual — part 113

Chery QQ Service Manual

Mechanical Part of SQR 472Engine

21

clearance once again:

Cylinder 1

Cylinder 2

Cylinder 3

Cylinder 4

IN

EX

IN

EX

IN

EX

IN

EX

—

—

—

O

O

—

O

O

If the clearance exceeds the standard value, adjust it by

replacing the adjustment gasket.

Notice: The position at which the measurement result

exceeds the standard value as well as the measurement

result should be recorded.

4.4.1 Rotate the camshaft and make the cam head of the

cylinder which exceeds the standard value faces upwards

and the opening of the valve tappet face inwards.

4.4.2 Rotate the crankshaft and press down the valve

tappet with the crown head of the cylinder cam.

4.4.3 As indicated in the right figure, put special tools on

and around the valve tappet from the inside of the cylinder

head, and then rotate the crankshaft so that the crown head

of the cam face upwards. Press the valve tappet with

special tools and hold on.

4.4.3.1

Pry out the adjustment gasket with screw driver,

remove the gasket inside with magnet.

4.4.3.2

Adjust the thickness of adjustment gasket with

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Mechanical Part of SQR 472Engine

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micrometer caliper.

4.4.3.3

Select the gasket on the basis of the standard

value of valve tappet

① Intake valve

Select gasket thickness = Unload thickness +

(Measured valve clearance -0.25mm)

② Exhaust valve

Select gasket thickness = Unload thickness +

(Measured valve clearance -0.25mm)

[Reference] The 32 kinds of gasket with different

thickness are listed in the following table:

2.18

2.40

2.62

2.20

2.42

2.64

2.22

2.44

2.66

2.24

2.46

2.68

2.26

2.48

2.70

2.28

2.50

2.72

2.30

2.52

2.74

2.36

2.58

2.80

2.32

2.54

2.76

2.38

2.6

4.4.3.4

Adjust the valve clearance with selected

adjustment gasket.

Notice: Install the adjustment gasket with its identification

mark facing downwards.

4.4.3.5

Rotate the crankshaft so that the crown head of

the cam faces downwards and presses down the the valve.

Pick up the special tool.

4.4.3.6

Rotate the crankshaft for 2-3 rounds and confirm

once again the valve clearance. If it is still beyond the

scope of standard value, adjust and inspect the valve

clearance according to the operation specified in 4.1-4.4.

3) Cylinder Head

1. Structure Diagram

Low

Chery QQ Service Manual

Mechanical Part of SQR 472Engine

23

1

Spark plug 20±1Nm

2

Cylinder Head

3

Weather Strip I

4

Cylinder cushion

5

Adjustment gasket

6

Valve tappet

7

Valve spring retainer

8

Valve spring seat

9

Valve Spring

10 Intake valve

11 Exhaust valve

12 Valve oil seal

13 Valve seat

14 Valve guide

2. Disassembly

2.1 Disassembly of spark plug

2.2 There are 8 boltes on the cylinder head. In the course

:

※

Components which may not be

reused

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Mechanical Part of SQR 472Engine

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of the assembly of cylinder head, slowly tighten these bolts

in the order as indicated in the right figure for several

times untill ther are tightened properly.

Notice: Remove the cylinder head bolts with a torque

socket wrench in the contrary order.

2.3 Disassembly of cylinder head and cylinder head

gasket

Notice: The cylinder head gasket is nonreusable.

2.4 Disassembly of valve adjustment gasket and valve

tappet

2.5 Disassemble the valve spring retainer lock, spring

retainer, spring seat, valve spring, intake valve, and

exhaust Valve etc with special tools.

2.6 Disassembly of valve oil seal and valve spring gasket

2.7 Cleanup

2.7.1 Clean the carbon dust on the valve.

2.7.2 Clean the bottom surface of cylinder head and the

surface of intake and exhaust manifold with scraper knife.

Notice: The surface of the cylinder head may not be

scratched in the course of cleanup.

Do not pollute the intake port and water passage.

3. Routine Inspection

3.1 Cylinder Head

Measure the flatness at each point with ring gauge as

indicated in the figure.

Cylinder head: 0.10mm

Surface of intake/exhaust manifold: 0.10 mm。

3.2 Valve Spring

3.2.1 Measure the square degree of valve spring with

square. Replace if it exceeds the specified value.

Limit: 1.2mm