Chery A15. Manual — part 235

(9) Install the special tool (Figure 54) to fix the camshaft and screw tight the tool bracket
bolts.
(10) Screw on the camshaft sprocket wheel bolts and use the special tool for the camshaft
to screw it tight with a torque of 115N.m (Figure 53).
(11) Screw tight the camshaft position sensor with a torque of 10N.m and plug in.
(12) Fix the valve chamber cover (see Engine/Cylinder Cover/ Valve Chamber Cover –
Fixing).
(13) Connect the storage battery cathode fittings.


Seven. Valve spring and valve oil seal
1. Unfixing sequence of the valve oil seal
(1) Detach the storage battery cathode fittings.
(2) Fix the valve chamber cover (see Engine/Cylinder Cover/ Valve Chamber Cover –
Unfixing).
(3) Unfix the intake and exhaust rocker arm assembly (see Engine/Cylinder
Cover/Cylinder Cover Rocker Arm/Adjustment – Unfixing).
(4) Fix the special tool adaptor (Figure 57).
(5) Fix the compression special tool adaptor (Figure 57).

Figure 57 Valve Spring/Oil Seal

1-Special tool

3-Special tool adaptor

2- Special tool adaptor

4-Compressed air hose

(6) Unfix the spark plug (Figure 58).
(7) Turn the crank shaft until the
cylinder piston reaches the upper limit of
the first cylinder.
(8) Fix the spark plug adaptor and apply
90-120 psi air onto the cylinder (Figure
57).
(9) Use the special tool adaptor. (Figure
57) Compress the valve spring and fix
the lockpin.
(10) Release the valve spring tensioner
and take out the valve spring retaining
plate and valve spring.
(11) Unfix the valve oil seal/valve spring
seat (Figure 59).


1-Valve oil seal tool
2-Valve



(12) Replace valve oil seal/spring seat
(Figure 61).
(13) Fix the air spring and spring seat.
(14) Use the special tool adaptor,
compress the valve spring and fix the
lockpin.
(15) Release the valve spring tensioner.
(16) Repeat the above steps to unfix
other cylinders.
(17) Uninstall the special tool.
(18) Fix the intake and exhaust rocker
arm/rocker arm shaft assembly (see
Engine/Rocker Arm/Adjustment –
Fixing).
(19) Fix the valve chamber cover (see
Engine/Cylinder Cover/Valve Chamber
Cover – Fixing).
(20) Fix the spark plug.
(21) Connect the storage battery cathode.
2. Valve spring and valve oil seal
(unfix the cylinder cover).

Figure 58 Special Tool Protective Cover

Figure 59 Unfixing the Valve Oil Seal

Unfixing the valve spring
(1) Compress the spring with special
tools.
(2) Spring compression adaptor (Figure
60)


1-Special tool;
2-Special tool





(3) Unfix the valve lockpin (Figure 61)
(4) Release the valve compression spring
and take out the valve spring retaining
plate and valve spring.
(5) Unfix the valve oil seal/valve spring
seat (Figure 59).
(6) Replace valve oil seal/valve spring
seat.
(7) Fix the valve spring and valve spring
retaining plate.
(8) Compress the valve spring with
special tools (Figure 60).
(9) Fix the valve lockpin.
(10) Release the valve compression
spring.
(11) Repeat the above steps for the
remaining valve oil seals.


1-Lockpin
2-Valve spring seat
3-Valve spring
4-Oil seal seat/valve seat
5-Cylinder cover
6-Intake valve
7-Exhaust valve

Figure 60 Fixing/unfixing the Valve

Spring

Figure 61 Valve/Oil Seal/Spring

3. Checking
Check the spring after the valve has been
unfixed, repaired or replaced (Figure 62).
For example: the valve spring’s
compressed length is 38mm. Check with
a special tool (see Engine – Description).


1-Valve spring special tool



Eight. Intake/exhaust valves and valve
seat
1. Valve and valve seat surface
treatment
It is applicable for all valve and valve
dimensions and angles.
(1) Use proper mechanical tools to adjust
the valve.
(2) Please check the remaining edges
after the valve has been adjusted (Figure
63). The intake valve edge shall not be
smaller than 0.79mm.
The exhaust valve edge shall not be
smaller than 1.19mm and replace if not
so.


1-Valve surface
2-Valve edge height


(3) After the valve seat is worn out and
can’t be used, its angle and width must
be repaired. Or the cylinder cover must
be replaced.
(4) Use proper mechanical tools to repair
and adjust the valve seat.
(5) The repair and adjustment values of
the valve seat must be correct.
(6) Measure the valve conduit and valve
seat with a dial indicator and the total
radial run-out shall not exceed 0.051mm.
(7) Check the sealing of valve seat.

Figure 62 Valve Spring Test

Figure 63 Intake and Exhaust Valve

Surface