Chery A series. Manual — part 9

VALVE, VALVE SPRING AND OIL SEAL
ASSEMBLY OF THE VALVE

Removal

Compress the valve spring with a special
compression device and take the valve cotter out.
Do not over compress the spring, which shall be
compressed to the travel stroke that the valve
cotter can slide from the groove, otherwise the
valve stem may bend.

If the valve cotter cannot slide out when the spring
is compressed, remove the compression device and
place a proper pipe on the spring seat. In this way,
the valve cotter will not be collided. Place a piece
of wood on the valve head (with the side of the
combustion chamber of the cylinder head towards
the table) and then hammer at the top of the pipe.

Reinstall the special compression device and
compress the valve spring to take the cotter out.
After the valve cotter is taken out, slowly loosen
the bolts to remove the compression device.

Remove the valve spring seat and valve spring and
take the valve oil seal and spring seat assembly out
with a screwdriver. The seal oil seal spring seat
must be replaced.

Put one set of valve, valve cotter, spring and spring
seat into one plastic bag, each of which shall be
tagged with numbers for installing them back to the
original position.

CYLINDER

1

B-13

Valve stem size and fit clearance

Intake（mm） Exhaust（mm）

Class

Diameter of

valve stem

Inner

Diameter of

valve guide

Clearance

Diameter

of valve

stem

Inner Diameter

of valve guide

Clearance

Standard 8.043

0

018

.

0

+

−

0

018

.

0

+

−

8.063—8.094

8.017

8.063—8.094

Oversized

0.4

8.443

0

018

.

0

+

−

0

018

.

0

+

−

8.463—8.494

0.02—

0.069

8.417

8.463—8.494

0.046—

0.095

Measure the free length and elasticity of the
valve spring

Compression

length (mm)

Spring load

(N)

Free Length

of Spring

(mm)

L

1

=37.084 422

L

2

=27.7 892.7

L

3

=27.0 945

L

0

=47.2

B-14

Grinding valve and valve seat ring

UAES’s new

two-valve

Face angle of intake valve

44º30′---45º30′

Width of the sealing band

for the intake valve seat

ring

1.75---2.32mm

Face angle of exhaust

valve

91º (0º-0º30ˊ)

Width of the sealing band

for the exhaust valve seat

ring

1.44±0.1

Installation
Before installation, the cylinder head shall be
completely cleaned and there shall be no any trace
of abrasive dust on the cylinder head, valve or
valve guide.

Lubricate the valve stem and valve guide bore with
clean motor oil.

Install the valve. The assembly shall be completed
according to the original valve indicators.

Note: The intake valves are interchangeable, but

the exhaust valves are not.

Press the valve oil seal and spring seat assembly
into the upper end of the valve guide, apply some
motor oil on the guide opening or the edge of the
valve oil seal and wrap the glove of the valve cotter
by adhesive tape. After the valve is installed, take
away the adhesive tape.

Install the valve spring and valve spring seat,
compress the valve spring seat to the stroke that
enables the valve cotter groove to appear by special
compression device and install the cotter. Then
slowly release the compression device and remove
it.

After the whole valve cotter is installed, put the
cylinder head on a piece of wood and knock at the
small end of the valve stem by a plastic or copper
hammer to help the valve mechanism to be in place
better.

B-15

Size of intake valve seat ring and cylinder head

eat ring bore

s

Class

Diameter of

intake

valve seat

ring (unit:

mm)

Diameter of

the seat ring

bore of

cylinder

head (mm)

Interfer

ence

(mm)

Standard

43.877

01

.

0

01

.

0

+

−

43.763

025

.

0

0

+

Oversized

0.5

44.377

01

.

0

01

.

0

+

−

025

.

0

44.263

0

+

Oversized

1.0

44.877

01

.

0

01

.

0

+

−

025

.

0

44.763

0

+

0.079

—

0.124

Size of exhaust valve seat ring and cylinder head seat ring bore

Class

Diameter of exhaust valve

seat ring (mm)

Diameter of cylinder head

seat ring bore (mm)

Interference

(mm)

Standard

38.877

01

.

0

01

.

0

+

−

38.263

0

025

.

0

+

Oversized

0.5

39.377

01

.

0

01

.

0

+

−

38.763

0

025

.

0

+

Oversized

1.0

39.877

01

.

0

01

.

0

+

−

39.263

0

025

.

0

+

0.079—0.124

UAES’s

new

two-valve

38.377

01

.

0

01

.

0

+

−

38.263

0

025

.

0

+

Oversized

0.5

38.877

01

.

0

01

.

0

+

−

38.763

0

025

.

0

+

Oversized

1.0

39.377

01

.

0

01

.

0

+

−

39.263

0

025

.

0

+

0.079—0.124

Size of valve guide and valve guide bore

Class

Valve guide bore

(unit: mm)

Diameter of cylinder head

guide hole (unit: mm)

Interference

(unit: mm)

Standard

13.555

0

01

.

0

−

13.481—13.519

Oversized

14.305

0

01

.

0

−

14.231—14.269

Oversized

14.505

0

01

.

0

−

14.481—14.519

0.026—0.07

B-16