67
groove is 0.00—0.051mm
。
After the semicircular key is installed, check the protrusion height. It should
be 1.392—1.739mm.
——Crankshaft thrust washers are two pieces. They are only installed on the front and back thrust
surface of cylinder block.
Before installation, apply the engine oil on the surface with oil groove of thrust washer. Position the
surface with oil groove towards the cylinder body and the surface with oil groove towards crankshaft.
——During installing crankshaft, engine oil should be applied main journal, connecting rod journal,
thrust surface and bearing half.
——The character like 1,2,3,4,5 are casted on the top of main bearing cap and also an arrow. During
assembling, install them from the front according to the sequence. At the same time, have the arrow
pointing to the front end surface of cylinder block. The width of main bearing cap 1,2,4,5 is same, but the
width of main bearing cap 3 is larger than others.
The main bearing cap is retained by rabbet. It is press fit between rabbet and cylinder body. The press
fit clearance is 0.025—0.145mm. After installation, the surface of the first and the fifth main bearing caps
should be even or lower than the front and back end surface of cylinder body.
Fig.94
Fig.95
Installation
：
——Nine main bearing bolts are hex head flange side bolts, and one is stud. For horizontal
engine, the stud is mounted in the left threaded hole of the second main bearing cap (see from the front)
which is for installing the carrier of oil collector. For the vertical engine, it should be mounted on the left
threaded hole of the forth main bearing cap (see from the front).
Before installing the main bearing bolt, engine oil should be applied on the joint surface of head end.
The main bearing bolt and stud should be screwed by hand first and tightened to 90—100Nm.
——The max rotating torque of the crankshaft (with piston rod assembly) is 16Nm.
【
12
】
. The removal and installation of oil baffle assembly
Removal
：
——Take out the oil baffle assembly from the right of the back end of the cylinder body.
——Install the oil baffle assembly from the right of the back end of the cylinder body (viewed
from the front). The oil baffle assembly should be tensioned. The spring should be lower than
the flange surface of cylinder block oil pan.
