Table 4-1.--Diesel Engine Troubleshooting Chart--Continued
Abnormal engine temperature:
· High temperature.
Insufficient heat transfer.
Test cooling system temperature.
Clean cooling system by flushing.
Thermostat not opening.
Coolant circulation inadequate.
Check coolant level.
Air circulation through radiator in- Replace broken fan belt.
Clean fan and radiator.
Loss of coolant.
Replace broken radiator hose.
Correct water pump gasket leak.
Replace engine. (Refer to QEC in-
· Low temperature.
Thermostat not closing.
When testing a GM diesel engine injector, you
of the most common problems, the probable causes of
must first perform which of the following
the problems, and the remedies for correcting them.
In-depth, up-to-date troubleshooting charts are in-
cluded in the applicable maintenance manuals for your
Loosen the fuel line to the injector
Remove the valve cover
Depress the injector with a screwdriver
Which of the following reasons is one of the
Remove all the injectors and test them
main causes for difficulty in starting a diesel
with an injector tester
Which of the following discrepancies is the
The injectors are clogged
probable cause of an abnormal operation of a
The fuel filter is clogged
There is air trapped in the fuel system
The battery voltage is low
Improper ignition timing
Clogged fuel injector
Low fuel in the unit
Intake valve time is incorrect