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1.
Symptoms of failed startup of engine:
When starting the engine, the starter drives the engine but the engine fails to be started.
Possible causes:
(1) Low battery;
(2) Battery terminal is rusted or loose;
(3) Battery earth wire is rusted or loose or poor GND of engine;
(4) Starter relay armature fails to disengage.
(5) Ignition switch fault or starter fault;
How to solve:
(1) Low battery is caused by electrical appliances that are not powered off in previous day. Next time, do not
forget to power off all electrical appliances at the end of the day. If you have well charged the battery during
driving the day before, the battery shall be on a full charge at the end of the day. For failed start-up caused by
low battery, change the battery pack or connect to another battery pack in parallel to start the engine.
(2) Clean the battery terminal, tighten the PS wire clip to contact the PS wire with battery terminal reliably.
(3) Clean the battery earth wire terminal to ensure reliable GND; ensure reliable GND of engine;
(4) Repair or change starter relay;
(5) Inspect and repair ignition switch and inspect and repair the starter;
(6) Long period operation of battery may increase the internal resistance; therefore, it is necessary to repair the
battery and correctly charge the battery and change with new battery pack if necessary; the battery shall be
fully charged to ensure successful start-up of engine.
2.
Check if it is low fuel level that makes hard to start the diesel engine
Symptom:
When starting the engine, the starter runs at acceptable rpm; however, it fails to start the engine.
Possible causes:
(1)
Fuel tank is empty;
(2) Fuel supply system channel fault;
(3) Air, water or foreign matter exist in fuel system, which block thesystem;
(4) Fuel pump fault;
(5) Engine fault;
How to solve:
(1) Fill the fuel tank with standard fuel, start the engine and run the engine to deliver the fuel to carburetor;
(2) Inspect pipeline of fuel supply system, fuel filter and fuel pump; change blocked and damaged assembly if
necessary to ensure unobstructed fuel supply.
(3) Release air in fuel system. If the engine can not be started due to air blockage, decrease the temperature
properly.
(4) Inspect the fuel pump. Only when the fuel pump works well can the fuel supply be unobstructed. Fuel supply
seldom fails and air blockage and water blockage seldom happen when the fuel supply of fuel pump is large.
Section V Troubleshooting of diesel engine
45
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