MAINTENANCE MANUAL OF GW4D20/GW4D20B TURBOCHARGED DIESEL ENGINES
92
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
Battery
Failing to select the storage battery as
required in severe cold areas; the battery
capacity lower than 100 Ah.
Select the low temperature storage battery
with the capacity higher than 100 Ah according
to the working temperature of the diesel
engine.
Oil Supply
System
See Subsection 11 of this chapter for
positions and phenomena of malfunctions
in the oil supply system.
(5) See Subsection 11 of this chapter for
troubleshooting the oil supply system. (see
Page 86 ~ 88)
3. Insufficient Power in the Diesel Engine
Insufficient power in the diesel engine means that the power of the diesel engine fails to meet the design
requirements, and a lack of power appears when the vehicle carries heavy load or climbs an abrupt
slope, and the diesel engine tends to stall. Insufficient power in the diesel engine always comes with and
has a close relation with difficult engine start-up, you should refer to each other for analysis.
Phenomenon and Cause of Malfunction
Troubleshooting
Malfunction in the oil
supply system: failing
to increase the power
or rotation speed after
stepping on the gas.
See Subsection 11 of
this chapter for positions
and phenomena of
malfunctions in the oil
supply system.
See
Subsection
11
of
this
chapter
for
troubleshooting the oil supply system.(see Page 86
~ 88)
Malfunction in air
intake and exhaust
systems: exhaust
temperature higher
than the normal one
and poor exhaust gas
color.
(1) Air cleaner blockage
(2) Blockage in exhaust
pipes or excessively long
connecting tubes, too
small turning radius and
too many elbows.
(1) Clean the dust in the filter core of air cleaner,
replace it if necessary.
(2) Eliminate the carbon deposit in the exhaust
pipe; and reinstall the exhaust connecting pipe with
its elbows no more than 3, and the exhaust cross
section should be big enough.
The performance of
each rotation speed
getting worse
(1) Malfunction in the oil
supply system
(2) Air leakage in the
valve
(1) See Subsection 11 for troubleshooting of
―insufficient power within all ranges pf the diesel
engine‖ in the oil supply system.
(2) Check the sealing performances of the valve
spring, the valve guide and the seat, examine and
repair them when the sealing performances are
poor and grind the valve and valve seat if
necessary.
Overheat of Diesel
Engine
(1) Overtemperature of
coolant
(2) Overtemperature of
engine oil
(3) Overtemperature of
exhaust air
(4) Malfunction in the oil
supply system
(1) Check the coolant system, eliminate the
encrustation and test the thermostat.
(2) Check the capacity of engine oil, add oil in the
engine if insufficient; if the shaft bearing shell or
some moving parts heat, find out the position and
the cause of heating, and eliminate it.
(3) Check
the
injection
pressure
and
the
atomization situation of the fuel injector.
(4) See Subsection 11 in this chapter for
troubleshooting the oil supply system. (see Page
86~88)
