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Main journal oil clearance
1. Clean the bearing bush, main journal, and the mounting surface of the engine body and
engine base.
2. Install the bearing bush and crankshaft to the engine body.
3. Place a plastic clearance gauge on the main journal and parallel it to the crankshaft
Note:
Do not place the plastic clearance gauge on the oil hole of the main journal.
4. Install the bearing bush on the engine base and the engine base on the engine body.
5. Tighten bolts with specified torque in the order of numerical symbols on the engine base.
Seating torque:
Frist
tightening
M10×1.5
16 Nm
Second
tightening
42 Nm
Frist
tightening
M8
14 Nm
Second
tightening
28 Nm
6. Remove the engine base and measure the compressed width of each plastic clearance
gauge; If it exceeds the specified value, replace the bearing bush.
Oil clearance: 0.012～0.044mm
Note:
Do not turn the crankshaft until the measurement is completed.
Selection of crankshaft bearing bush
Select the corresponding crankshaft bearing bush according to the group number on the
engine body and crankshaft.
The group numbers on the engine body are engraved on the side of the body, and are divided
into three groups 1, 2 and 3 according to the bore diameter from small to large.
There are 5 in total, and each one corresponds to the shaft hole group at the point.
The group number of bearing journal of crankshaft is engraved on the first fan plate of
crankshaft, and it is divided into three groups 1, 2 and 3 according to the diameter from large
to small.
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