Chery A18. Manual - part 36
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