Note:
Refer to “Inspecting the Primary Air Cleaner
Inspecting the Primary Air Cleaner
Elements
Illustration 43
g00281693
Inspect the clean, dry primary air cleaner element.
Use a 60 watt blue light in a dark room or in a similar
facility. Place the blue light in the primary air cleaner
element. Rotate the primary air cleaner element.
Inspect the primary air cleaner element for tears and/
or holes. Inspect the primary air cleaner element for
light that may show through the filter material. If it is
necessary in order to confirm the result, compare the
primary air cleaner element to a new primary air
cleaner element that has the same part number.
Do not use a primary air cleaner element that has
any tears and/or holes in the filter material. Do not
use a primary air cleaner element with damaged
pleats, gaskets or seals. Discard damaged primary
air cleaner elements.
i02335405
Engine
Air
Cleaner
Service
Indicator
-
Inspect
Some
engines
may
be
equipped
with
a
different
service
indicator.
Some
engines
are
equipped
with
a
differential
gauge
for
inlet
air
pressure.
The
differential
gauge
for
inlet
air
pressure
displays
the
difference
in
the
pressure
that
is
measured
before
the
air
cleaner
element
and
the
pressure
that
is
measured
after
the
air
cleaner
element.
As
the
air
cleaner
element
becomes
dirty,
the
pressure
differential
rises.
If
your
engine
is
equipped
with
a
different
type
of
service
indicator,
follow
the
OEM
recommendations
in
order
to
service
the
air
cleaner
service
indicator.
The
service
indicator
may
be
mounted
on
the
air
cleaner
element
or
in
a
remote
location.
Illustration 44
g00103777
Typical service indicator
Observe the service indicator. The air cleaner
element should be cleaned or the air cleaner element
should be replaced when one of the following
conditions occur:
• The yellow diaphragm enters the red zone.
• The red piston locks in the visible position.
Test the Service Indicator
Service indicators are important instruments.
• Check for ease of resetting. The service indicator
should reset in less than three pushes.
• Check the movement of the yellow core when the
engine is accelerated to the engine rated speed.
The yellow core should latch at the greatest
vacuum that is attained.
If the service indicator does not reset easily, or if the
yellow core does not latch at the greatest vacuum,
the service indicator should be replaced. If the new
service indicator will not reset, the hole for the service
indicator may be restricted.
SEBU8172-04
83