Chery A15. Manual - part 236

 

(8) The thickness of appropriate intake 
and exhaust valve seats is 0.75-1.25 
(Figure 64).  

 
 
 

 

 

 

 

1-Seat thickness 

 

2-Valve surface angle 

 

3-Valve seat angle 

 

4-Valve contact area 

 

 

 

 

 

(9) After grinding the valve seat, check 
the valve tip and cylinder cover surface 
dimension and measure the valve height 
(A) (Figure 65). Valve specifications 
(see Engine – Specifications).  

 

Figure 64 Valve Surface and Oil Seal 

 
 
 

(10) Measure the height (B) of valve 
spring (Figure 65) (see 9 Engine – 
Criteria).  

 
 
 

 

 

 

 

1-Spring 

 

2-Valve spring seat/oil seal 

 

3-Cylinder cover surface 

 

A-Valve height as indicated 

 

B-Valve spring height 

 

 

 

 

Figure 65 Valve Height as 

indicated/Valve Spring Height 

 
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 
 

 

 

Section Six Engine Cylinder Body Components 

 
 
One. General Description 
The cylinder body is made of cast iron components (Figure 66) 
 
 
 
 
 
 
 
 
 
 
 

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 

Figure 66 Engine Cylinder Body and Crank Shaft 

 

1-Main bearing cover bolt 

 

5-Crank shaft 

2-Main bearing cover bolt 

 

6-Upper crank shaft bearing shell 

3-Integrated main bearing cover 

7-Cylinder body 

4-Lower crank shaft bearing shell 

 
 
 
 
 
 
 
 

 

 
Two. Cylinder checking 
1. Checking 
(1) Clean all holes on the cylinder and 
check for any leakage.  
(2) Fix the new engine oil filter (see 
Engine-Troubleshooting Steps-Engine 
and Engine Oil). 
(3) Check for any cracks on the cylinder 
surface.  
(4) Check the evenness of the cylinder 
surface. The grading shall be less than 
0.1mm or the cylinder body shall be 
replaced.  
2. Cylinder diameter  
Note: measure the cylinder diameter 
and the temperature had better be 21
℃ (70 F) during measurement 
Measure the radial run-out of the 
cylinder surface with a dial indicator 
(Figure 68) (see Engine-Description).  
The cylinder’s measured values of A and 
B (Figure 68) shall be 10mm for the top 
and bottom (see Engine-Specifications). 
 
 
 
 
Three. Crank shaft bearing shell 
1. General description 
Note: the upper and lower bearing 
shells are not interchangeable.  
 
1-Upper crank shaft bearing shell 
2-Thrust bearing 
3-Lower crank shaft bearing shell 
 
 
Crank shaft 
1-Crank shaft 
2-Sprocket wheel 
 
 
 
 
 

 
 
 
 
 
 
 
 
 
 

Figure 67 Cylinder Model 

 
 
 
 
 
 
 
 
 
 
 
 

Figure 68 Checking the Cylinder 

 
 
 
 
 
 
 
 
 
 
 
 

Figure 69 Crank Shaft Bearing Shell 

Cover 

 
 
 
 
 
 
 

Figure 70 Crank Shaft 

 

 
 
2. Troubleshooting steps for crank 
shaft axial clearance 
(1) Fix the dial indicator onto the engine 
body as follows (Figure 71).  
(2) Move the crank shaft 
(3) Calibrate the zero value of the dial 
indicator  
(4) Move the crank shaft and observe the 
dial indicator reading. Reading 
description (see Engine-Specifications).  
3. Unfixing 
(1) Unfix the engine assembly off the car 
(see Engine-Unfixing). 
(2) Detach the axle shaft off the engine. 
(3) Unfix the clutch and pressure plate to 
take out the flywheel. 
(4) Unfix the crankshaft rear oil seal (see 
Engine/Engine Cylinder/Crank Shaft 
Engine Oil Seal-Rear-Unfixing).  
(5) Fix the engine onto an appropriate 
service platform.  
(6) Unfix the right engine bracket (see 
Engine/Engine Support/Engine Bracket-
Unfixing).  
(7) Unfix the crank shaft shock absorber 
(see Engine/Engine Body/Shock 
absorber-Unfixing).  
(8) Unfix the timing chain (see 
Engine/Valve Timing/Timing 
Belt/Sprocket Wheel and Chain-
Unfixing).  
(9) Unfix the intake manifold (see 
Engine/Manifold/Intake Manifold – 
Unfixing)  
(10) Unfix the engine oil gauge and 
conduit.  
(11) Unfix the engine oil sump (see 
Engine/Lubrication/Engine Oil Sump – 
Unfixing).  
(12) Unfix the engine oil pump bracket 
pipe (Figure 72).  
 
 
 

 
 
 
 
 
 
 
 
 
 
 
 
 
 

Figure 71 Checking the Radial Run-out 

of the Crank Shaft