MAINTENANCE MANUAL OF GW4D20/GW4D20B TURBOCHARGED DIESEL ENGINES
36
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
km)
Tension pulley,
accessory wedge
idle wheel and
flat idle wheel
Check,
maintain
when replacing the
belt, replace the
tension pulley
subassembly,
accessory wedge
idle wheel and flat
idle wheel
depending on the
their conditions
Replace the
tension pulley
after changing
the belt twice
Water pump
Check the water leakage of
overflow
Electrical
appliance
Check wiring, engine and starter
Crankcase vent
system (including
intake pipeline)
Check, wash
Note:
①
When the vehicle travels in a severe condition, traveling distance and time for replacing the oil
filter are: per 5000 km or per 100 h.
②
If the diesel used contains impurities, the cycle for replacing the fuel filter should be shortened. If the
fuel filter is blocked by impurities, the fuel filter should be replaced in time.
(continued)
Maintenance
cycle
Maintenance
Items
Daily
technical
maintenance
First level
maintenance
Second level
maintenance
Third level
maintenance
Remarks
4000
～
5000 km
10000
～
12500 km
50000
～
100000
km
Washing the
cooling system
Wash the cooling
system
Washing the
engine
Wash the carbon
deposit, oil stains,
incrustation, oil
duct, oil pipe.
Piston ring
Inspect for wear
Depending on
the working
condition of
engine
Cylinder inner
wall
Inspect for wear
Connecting rod
bearing shell
Inspect for wear
Main shaft
bearing shell
Inspect for wear
Camshaft timing
driving gear
Inspect for wear
Thrust plate
Inspect for wear
Intake/exhaust
valve
Inspect for wear
