Chapter III Malfunction Diagnosis and Troubleshooting
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
91
1. Failure to Start the Diesel Engine
Phenomenon and Cause of Malfunction
Troubleshooting
Electrical
System
(1) Wrong wiring or poor contact
in circuits
(2) Insufficient power in the
storage battery
(3) Poor contact between the
carbon
brush and the commutator
of starter
(1) Check whether the wiring is correct and firm.
(2) Check the specific gravity of electrolyte, the
voltage of storage battery, and charge the storage
battery according to the technical requirements if
necessary.
(3) Repair or replace the carbon brush, clean the
surface of the commutator with water abrasive paper
and blow it clean.
Fuel
Supply
System
(1) Air in the fuel supply system
(3) Fuel filter blockage
(4) No oil supply or discontinuous
oil supply in the fuel delivery
pump
(5) Malfunction in the electronic
control parts of fuel supply
system
(1) Check whether the connectors of fuel supply
pipelines are loose, remove the connector of the high
pressure fuel pump fuel return hose, supply fuel with
the manual fuel delivery pump until the overflowed
fuel is air bubble free, then install the fuel return hose.
(2) Check whether the pipeline of fuel supply system
is smooth.
Replace the fuel filter
(4) Check whether the fuel inlet pipe is leaking and
whether the filter screen on the fuel inlet pipe
connector is blocked, reinstall the screen after
eliminating the blockage.
(5) See Subsection 11 of this chapter for
troubleshooting the fuel supply system (see Page 86
~ 88).
Mechanical
System
(1) Excessive wear of the piston
ring
(2) Air leakage in the valve
(1) Replace the piston ring
(2) Check the sealing performances of the valve
spring, the valve guide and seat, examine and repair
them when the sealing performances are poor and
grind the valve and valve seat if necessary.
2. Difficulty in Starting the Diesel Engine at a Low Temperature
Phenomenon and Cause of Malfunction
Troubleshooting
Fuel
Failing to select the motor diesel (fuel oil)
as required in winter or severe cold
areas, or the diesel oil getting thick and
frozen at a lower temperature.
Select the motor diesel (fuel, GB19147
——2009) with a low freezing point according
to the working temperature of the diesel
engine.
Lubricating
Oil
Failing to select the engine oil as required
in winter or severe cold areas, or the
engine oil getting excessively sticky and
the internal frication increasing at a low
temperature, or the starting resistive
torque of diesel engine increasing.
Select the engine oil with a low viscosity
according to the working temperature of the
diesel engine in order to reduce the power
required when starting. (the engine oil above
APl CI
– 4 of Mobil Oil Corp. is recommended)
