Chery A15. Manual — part 9

HYDRAULIC TAPPET

Removal

Take the hydraulic tappets out and place them
into an oil-filled vessel to prevent the hydraulic
tappet oil from leaking out.

Check the top and bottom contact surfaces of
the hydraulic tappet to observe whether there
are abnormal abrasion or scrapes. If yes,
replace it with new one if necessary.

Installation

Apply hyperbolic gear oil or motor oil on the
tappet and external diameter as well as its two
ends and place the tappet into the cylinder
head hole in the original order.

Size of Hydraulic Tappet

Class

Outside circle diameter

(unit: mm)

Hole diameter of the cylinder

head tappet (unit: mm)

Fit clearance

(unit: mm)

Standard

￠22.200~￠22.212

￠22.25±0.015

0.023~0.065

T25

￠22.454~￠22.466

￠22.50±0.015

0.023~0.065

Tappet

B-12

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