INTRODUCTION TO THE HMMWV - OD1615 - LESSON 1/TASK 2
The engine is equipped with a spring-loaded bypass valve.
protects the engine from oil starvation by opening when the filter becomes
There is an oil sensing unit, located on the left rear of the cylinder
block, which senses the pressure of the oil in the left main gallery. This
sensing unit is connected to the oil pressure gage, located on the
instrument panel. The gage registers the signal sent from the sending unit
and indicates to the driver if the pressure of the lubrication system is
above, at, or below its normal operating range.
Engine Electrical System
The electrical system for the 6.2 liter diesel engine is a 24 volt system
capable of submerged operation during fording. The engine electrical system
is composed of the starter, alternator, glow plugs, glow plug controller,
protective control box, and the wiring harness.
Operation of the engine electrical system will be discussed in lesson four
of this subcourse, since this system is a part of the vehicle electrical
system as a whole.
The waste products of combustion are carried from the engine to the rear of
the vehicle by the exhaust system, where they are expelled to the
exhaust system consists of exhaust manifolds, a crossover pipe, a muffler,
and a tail pipe.
Exhaust components are constructed of aluminized and stainless steel for
corrosion protection. The exhaust crossover pipe is bolted to the exhaust
manifolds. The muffler is a reverse-flow double-pass and is mounted between
the frame rails. The tail pipe is routed in front of the left rear wheels
and out to the side of the vehicle.