DETROIT DIESEL
Engine Systems
AIR SYSTEM
In the scavenging system used in two-cycle engines,
illustrated in Figs. 5 and 6, a charge of air is forced into
The air cleaners are designed for fast, easy disassembly
the cylinders by the blower and thoroughly sweeps out
to facilitate efficient servicing. Maximum protection of
all of the burned gases through the exhaust valve ports.
the engine against dust and other forms of air
This air also helps to cool the internal engine parts,
contamination is possible if the air cleaner is serviced at
particularly the exhaust valves. At the beginning of the
regular intervals.
compression stroke, each cylinder is filled with fresh,
clean air which provides for efficient combustion.
The light-duty oil bath type air cleaner (Fig. 7) consists
of a metal wool cleaning element supported inside of a
The air, entering the blower from the air silencer or air
housing which contains an oil reservoir. A chamber
cleaner, is picked up by the blower rotor lobes and
beneath, the oil reservoir serves as a silencer for the
carried to the discharge side of the blower. The
incoming air to the blower. Air is drawn into the cleaner
continuous discharge of fresh air from the blower enters
by the blower and passes over the top of the oil bath,
the air chamber of the cylinder block and sweeps
where a major portion of the dirt is trapped, then up
through the intake ports of the cylinder liners.
through the metal wool, where the finer particles are
removed, and then down the central duct to the blower.
The angle of the ports in the cylinder liner creates a
uniform swirling motion to the intake air as it enters the
The heavy-duty oil bath type air cleaner (Fig. 8)
cylinder.
This motion persists throughout the
consists of the body and fixed filter assembly which
compression stroke and facilitates scavenging and
filters the air and condenses the oil from the air stream
so that only dry air enters the engine. The condensed
oil is returned to the cup where the dirt settles out of the
oil and the oil is recirculated. A removable element
Air Cleaners
assembly removes a major part of the dust from the air
Several types of air cleaners are available for use with
stream thereby decreasing the dust load to the fixed
industrial engines. The light-duty oil bath air cleaner is
element. An inner cup, which can be removed from the
used on most models. However, a heavy-duty oil bath
outer (oil cup), acts as a baffle in directing the oil-laden
type or a dry type air cleaner may be installed where the
air to the element and also controls the amount of oil in
engine is operating in heavy dust concentrations.
circulation and meters the oil to the element. The oil
cup supports the inner cup and is a reservoir for oil and
a settling chamber for dirt.
Service the light-duty oil bath air cleaner as follows
Fig. 5 - Air Intake System Through Blower and
Fig. 6 Air Intake System Through Blower and
Engine (In-line Engine)
Engine (6V-53 Engine)
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