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