MAINTENANCE MANUAL OF GW4D20/GW4D20B TURBOCHARGED DIESEL ENGINES
46
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
Fig. 2-8-24 Removing and reinstalling the oil
filter
Fig. 2-8-25 Installing the oil filter
Fig. 2-8-26 Low oil pressure indicator lamp
Caution:
(1) The rotary oil filter is disposable and is not allowed to
be reused.
(2) The oil filter should be replaced regularly in
accordance
with
the
technical
maintenance
requirements.
Special attention should be paid to the rubber sealing
ring when the oil filter is removed and reinstalled so as
not to damage the sealing ring and cause leakage.
If the rubber sealing ring of oil filter is damaged, it should
be replaced.
5.5 Low Oil Pressure Indicator Lamp
The low oil pressure indicator lamp of vehicle diesel
engine (see Fig. 2-8-26) will light up when the ignition
switch is in the ―ON‖ position and go out after the diesel
engine is started, and it always be off while the diesel
engine is running. If the indicator lamp flashes or keeps
on, it means that the oil pressure is low or there is no oil
pressure. In this case, the diesel engine may be
seriously damaged and it must be repaired immediately.
Attention:
The diesel engine running in the low
engine oil pressure condition may cause serious
mechanical damage.
(1) When the low oil pressure indicator lamp flashes or
keeps on, park the vehicle in a safe place and stop the
engine.
(2) Let the vehicle rest for several minutes. Open the
engine hood and check the oil level.
(3) Add oil to make the oil level back to the upper scale
mark on the dipstick if necessary.
(4) Start the diesel engine and observe the low oil
temperature indicator lamp, stop the diesel engine if the
lamp does not go out within 10 s. At this moment, the
diesel engine has mechanical malfunctions and it should
be repaired.
6. Technical Maintenance for Cooling System
6.1 When the diesel engine is running, there must be
enough antifreeze and antirust fluid (coolant) to ensure
the diesel engine can run properly. Check the coolant
level every time before traveling, and replenish
antifreeze and antirust fluid in time. See Fig. 2-8-27
If the coolant level in the fluid reservoir is at or lower than
the lower limit (MIN) mark, add coolant and make the
coolant level back to the upper limit (MAX) mark. Then
close the fluid reservoir lid, and check if there is leakage.
If the fluid reservoir is empty, it is required to check the
level of the coolant in the radiator.
Special tool
Remove and reinstall
the engine oil filter
with the special tool
