MAINTENANCE MANUAL OF GW4D20/GW4D20B TURBOCHARGED DIESEL ENGINES
56
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
Section XII Repair Operation for Engine
Fig.2-12-1 GW4D20 turbocharged diesel
engine assembly
Fig.2-12-2 Cleaning the filter core of air
cleaner
Fig.2-12-3 Washing the air cleaner cover
and housing
Attention:
The general repair operation should be
done by qualified maintenance personnel.
1. Model Mark
Engine number
The diesel engine number is printed on the central front
of left side of cylinder body, as shown in Fig.2-12-1.
Example of the engine number printed on cylinder body:
2. Air Cleaner
Dry paper filter core
Cleaning methods may differ according to filter core
conditions.
Filter core blocked by dust
Move the filter core with hands and blow the filter core
from the inner side to the outer side with compressed air,
the dust will be removed by doing this. See Fig.2-12-2.
Caution:
Do not blow the filter core from the outer
side to the inner side with compressed air; if so, the dust
will enter the interior of filter core (clean face).
The pressure of compressed air
392
～
490 kPa
Caution:
Do not strike the filter core on other
objects to clean the filter core, if so, the filter core will be
damaged.
If the following cases appear, the filter core should be
replaced:
——the filter core is contaminated by carbon deposit or
grease.
——the filter core is seriously contaminated, and the
contamination is hard to remove.
——the filter core is deformed and damaged.
Position of model
mark
Model number
Asterisk
Year
Month
Sequence
number
Asterisk
Filter core of air
cleaner
Cleaner cover
Cleaner housing
