Chery A15. Manual - part 13

 

CRANKSHAFT 

CRANKSHAFT, CRANKSHAFT THRUST 
SPACER, BEARING SHELL AND MAIN 
BEARING CAP 

Removal 

Check the axial clearance of the crank shaft before 
removal.  

Kiss the end side of the crank shaft with the 
contacts of a dial gauge (less degree of shrinkage). 
Push the crank shaft away from the contacts and 
adjust the dial gauge to 0, then push the crank shaft 
to the direction of contacts as possible with a0 stout 
carrying pole. Check the reading of the dial gauge, 
which shall be the axial clearance. The axial 
clearance of a crank shaft is 0.092-0.303mm.   

The leaf of a clearance gauge can be used to check 
the axial clearance of a crank shaft if there is no 
dial gauge, which shall be placed between the third 
main bearing cap and crank shaft (push and pull the 
crank shaft). 

Loosen the bolts and studs of the main bearing 
shell, (beginning from the middle bearing cap), 
take out the bolts and the threaded rods to remove 
the main bearing cap and the lower shell of the 
main bearing shell. This lower shell shall still 
remain in the main bearing cap. 

Take the crank shaft out. 

Remove the crank shaft thrust spaces (2 pieces) 
from the cylinder block. 

 

 

 

 

   

Inspection 

Check the main journal and main bearing shell 
clearance. 

Clean the main journal of the crank shaft, the 
internal bore of the main bearing cap and main 
bearing shell with a non-woven fabrics. Place the 
plastic clearance gauge (its length slightly shorter 
than the length of the main journal) on the main 
journal, which shall be in parallel with the 
generator of the main journal. 

Note: Do not rotate the crank shaft！ 

 

B-28

Install the main bearing cap. Tighten the bolts of 
the main bearing cap at the moment of 90-100N.m 
by hands. Do not rotate the crank shaft. 

 

 

 

 

Remove  the main bearing bolts. Carefully take 
out the main bearing cap and arrange them in order. 
Read the bearing clearance according to the ratio 
on the envelope of the plastic clearance gauge. 
Check the bearing clearance from the third main 
bearing and extend to both sides. The main bearing 
clearance shall be 0.011—0.058mm.  

Check the bearing clearance of the connecting rod.

Check the bearing clearance of the connecting rod 
according to the above methods. The bearing 
clearance of the connecting rod shall be 0.006—
0.06mm. 

 

 

 

 

 

Size of connecting rod journal and connecting-rod bearing shell                                                             

       

Class 

Diameter of 

connecting rod 

journal 

(unit: mm) 

Thickness of 

connecting-rod 

bearing shell 

(unit: mm) 

Standard 47.89—47.91  1.480—1.487 

Downsized 

by 0.025 

47.89—47.91 1.492—1.499 

Downsized 

by 0.25 

47.64—47.66 1.605—1.612 

Downsized 

by 0.5 

47.39—47.41 1.730—1.737 

Downsized 

by 0.75 

47.14—47.16 1.855—1.862 

Downsized 

by1.0 

47.89—46.91 1.980—1.987 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

B-29

Diameter of main journal and size of main bearing shell 

 

Class 

Diameter of main 

journal (unit: mm)

Diameter of the main bearing 

bore of the cylinder block     

(unit: mm) 

Thickness of the main 

bearing shell     

(unit: mm) 

Standard 57.98—58.00  62.2935+0.0065 2.131—2.138 

Oversized by 0.4 

57.98—58.00 

62.6935+0.0065 2.331—2.338 

Downsized by 0.02 

57.98—58.00 

62.2935+0.0065 2.141—2.148 

Downsized by 0.25 

57.73—57.75 

62.2935+0.0065 2.256—2.263 

Downsized by 0.50 

57.48—57.50 

62.2935+0.0065 2.381—2.388 

Downsized by 0.75 

57.23—57.25 

62.2935+0.0065 2.506—2.513 

Downsized by 0.25 

and oversized by 

0.4 

57.73—57.75 62.6935+0.0065 2.456—2.463 

Downsized by 0.50 

and oversized by 

0.4 

57.48—57.50 62.6935+0.0065 2.518—2.558 

Downsized by 0.75 

and oversized by 

0.4 

57.23—57.25 62.6935+0.0065 2.706—2.713 

 

Size of crank shaft thrust, thrust spacer and cylinder block thrust 

 

Class 

Size of cylinder block thrust 

(unit: mm) 

Size of crank shaft thrust   

(unit: mm) 

Thickness of thrust 

spacer (unit: mm) 

Standard 24+0.03 28.825-28.875 

2.326+0.025 

Oversized 

by 0.38 

24+0.03 29.205-29.255 

2.516+0.025 

 

2 thrust spacers 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

B-30

Installation 

Before installation, tap the threaded hole on 
the cylinder block with tapping drill, 
especially those of the cylinder head bolts and 
main bearing bolts.   

   Cylinder head bolt: M10X1.5~6H 

   Main bearing bolt: M12X1.75~6H 

Installation of the whiney key of the crank 
shaft: gently drive the whiney key into the key 
slot. The clearance between the whiney key 
and key slot is 0.00~0.051mm. Check the 
protrusion after the whiney key is installed, 
which shall be 1.392~1.739mm. 

There are two pieces of crank shaft thrust 
spacers, which are installed on the front and 
rear thrust surfaces. Before installation, apply 
some motor oil on the side of the thrust spacer 
with oil groove and make this side towards the 
cylinder block and the other side towards the 
crank shaft. 

Apply some motor oil on the main journal, 
connecting rod journal, thrust surface and 
bearing shell before the crank shaft is 
installed. 

The top of the main bearing cap is cast with 
numbers- 1, 2, 3, 4, 5 and one arrow. During 
the assembly, start the installation in a 
front-to-back order and enable the guide 
finger towards the front end surface of the 
cylinder block. The width of 1, 2, 4, 5 main 
bearing cap is same, but that of the third main 
bearing cap is larger than others. The location 
of the main bearing cap depends on the rabbet 
and the rabbet and the cylinder block is 
interference fit, with the interference to be 
0.025~0.145mm. After the assembly, the sides 
of the first and fifth main bearing cap shall be 
even with or lower than the back and front 
end surface of the cylinder block. 

 

 

 

Among the main bearing bolts, 9 are 
hexagonal-head flanged bolts and 1 is stud. 
For transverse engine, the stud shall be 
installed on the left threaded hole of the 
second main bearing cap (seeing from the 
front) for installing the support of the suction 
strainer. For a north-south engine, the stud 

 

B-31