Chery S11 / Chery QQ. Manual — part 114

Chery QQ Service Manual

Mechanical Part of SQR 472Engine

25

3.2.2 Measure the free state of the spring.

Standard value: 37mm

3.3 Inspection of valve

3.3.1 Check if it is deformed or abrades.

Inspection of valve Unit: mm

Item

Standard value

Limit:

0.10

IN

0.85～1.41

—

Width of seal

EX

1.07～1.36

—

IN

1.0±0.2

0.75

Thickness of top

of valve

EX

1.0±0.2

0.75

3.3.2 Check the clearance of valve guide and valve stem.

3.3.2.1

Measure the inside diameter of valve guide with

dial gauge, the outer diameter of valve stem with

micrometer caliper.

3.3.2.2

Figure out the difference of measured values and

the clearance. If the clearance is beyond the specified

value, replace valve or guide.

Notice: As can be seen from the right picture, at measuring

point, work out the clearance of last abrasion part.

Item

Standard value

Limit: 0.10

Valve guide inside

diameter(mm)

φ5.0

—

Valve guide outer

diameter(mm)

φ5.0

—

IN

0.056～

0.020mm

0.07

Clearance

EX

0.066～

0.030mm

0.08

Thickness

of

Top

Measurement

Position

of

Outer

Diameter

Measurement

Point

Measurement Point

Measurement of Valve Guide Inside Diameter

Chery QQ Service Manual

Mechanical Part of SQR 472Engine

26

3.3.3

Replacement of valve guide.

3.3.3.1

Heat the cylinder head with hot water to 80-100

℃.

3.3.3.2

Take out the valve guide from one side of

combustion chamber with special tool, as can be seen from

the right picture.

Notice: The removed valve guide may not be reused.

The intake valve guide and the exhaust valve guide may

not be mis-installed.

3.3.3.3 Mount the new valve guide with special tool at

the place as can be seen from the right picture.

Notice: strike the conduit slowly to the position in the

cylinder head; do not strike too far and be careful for size.

The height of the part of valve guide struck into the

cylinder head:

Type

Item

EF

GL, ZL, RL, GS, ZS

Height (mm）

IN

13.71±0.25

EX

12.11±0.25

3.3.3.4

Rub the inside diameter with reamer to reach the

standard clearance value.

3.3.4 Assorted surface of valve

3.3.4.1 Spread with red lead on the assorted surface of

valve. Do not rotate the valve but press lightly and check

the assortment and width.

IN Use

EX Use

Chery QQ Service Manual

Mechanical Part of SQR 472Engine

27

3.3.4.2

Repair of valve seat insert

Notice: The repair of valve seat is always conducted in

the course of the inspection of valve’s fitting position. The

surface repaired should be free from any breakage. Take it

out slowly after the inspection.

3.3.4.3

45wimble surface is assorted standard value.

3.3.4.4

Inspect the fitting position of the valve. The best

position is the center of the valve. If no the valve should be

adjusted.

3.3.4.5

Cut wimble surface at the center of assorted

position with inner 70and outer 30

3.3.4.6

Prepare for polishing of valve seal.

3.4 Assembly of cylinder head

3.4.1 Cylinder head

Pay attention to the following for installing the other

auxiliary part of cylinder head:

3.4.2 Protective tube of spark plug

1. Press the protective tube of spark plug into the

protective tube hole on the cylinder head with the special

auxiliary tool. Before pressing, spread the protective tube

with sealant. The pressing depth is indicated in the right

figure.

Notice: Pay attention to the pressing depth and the

uprightness to top of cylinder head when pressing.

During pressing, the protective tube can not be deformed,

or leaking will be occurred at the cylinder head cover.

Protective Tube of Spark Plug

Chery QQ Service Manual

Mechanical Part of SQR 472Engine

28

3.4.3

Installation

3.4.3.1

Assembly of valve spring washer and valve oil

seal

3.4.3.1.1 Clamp the special auxiliary tool on the top of

valve stem and spread oil around the auxiliary tool and the

inner of new valve oil seal. Then mount it at the position as

can be seen from the picture and pull out the mounting

auxiliary tool of valve oil seal.

[Reference] After being pressed down, the size of

the oil seal should comply with the value

indicated in the right figure.

3.4.3.2

Assembly of intake valve and exhaust valve

3.4.3.2.1 Assembly of valve spring.

Notice: The painting is used for recognizing the different

suppliers, so the same engine should use the valve spring

with same painting.

3.4.3.3

Assembly of valve keeper

Warning: Operate with goggle for protecting the eyes.

·Be care for spring jumping out.

After assembly of valve spring and its seat, press the valve

spring with special tool and mount the valve keeper.

3.4.3.4

Assembly of valve tappet and valve clearance

adjustment gasket

3.4.3.5

Mount the cylinder head gasket and recognize

the direction of front and back.

3.4.4

Assembly of dust seal and cylinder head

Auxilary Tool of Valve Spring Assembly

Valve

Valve Oil Seal

Assembly Lower Surface of

Valve Spring

Painting