TROUBLESHOOTING THE HMMWV - OD1616 - LESSON 1/TASK 2
(15) Glow Plugs. Diesel engines of the prechamber design, like the
HMMWV, require a preheating glow plug extending into the prechamber
to aid in starting when cold.
These are located in the cylinder
head, below each injector nozzle.
When the RUN/START switch is
placed in the RUN position, the glow plugs are energized and air in
the prechamber is heated to approximately 1400 F.
In 0 F weather
the glow plugs will preheat the prechamber in six seconds; the engine
will then start more easily.
Glow Plug Controller. The glow plugs in the HMMWV are controlled by
a fast-start control system. The controller, located in the coolant
outlet manifold, is a thermal model of the glow plugs and turns the
glow plugs on and off by monitoring engine coolant temperature.
3.
Test Equipment
Multimeter.
At the unit level, there is only one piece of test
equipment used to troubleshoot the electrical system; that test
equipment is the multimeter. In the paragraphs that follow, we will
discuss the TS352 B/U multimeter (figure 1 on page 46).
The TS352
B/U is the most commonly found multimeter in the automotive unit
maintenance number 1 and 2 common tool sets.
It is of military
design and is an important and useful piece of test equipment.
It
can be used to perform voltage, resistance, and continuity checks on
the electrical system of the HMMWV.
For the sake of this subcourse, it is assumed that the student is
familiar with the care and usage of the multimeter. Therefore, this
information will not be repeated here.
However, additional
information concerning the multimeter can be obtained in TM 11-6625-
365-15.
4.
a.
Electrical System Troubleshooting Procedures.
The following
paragraphs provide the information necessary to diagnose and correct
malfunctions of the electrical system.
Because of its complexity,
the electrical system is divided into the following functional
systems:
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