
94 SEBU8088-06
Maintenance Section
Engine Air Cleaner Service Indicator - Inspect
g00736431
Illustration 58
(1) Cov er
(2) Primary air cleaner e lement
(3) Secondary air cleaner element
(4) Air inlet for the turbocharger
1. Remove the cover. Remove the primary air
cleaner element.
2. Cover the air inlet for the turbocharger with
adhesive material in order to keep dirt out of the
turbocharger.
3. Clean the inside of the air cleaner cover and body
with a clean, dry cloth.
4. Remove the adhesive covering that covers the air
inlet for the turbocharger. Install the secondary
air cleaner element. Install a primary air cleaner
element that is new or clean.
5. Install the air cleaner cover.
6. Reset the air cleaner service indicator.
i01900118
Engine Air C lean er Service
Indic ator - Insp ect
(If Equipped)
SMCS Code: 7452-040
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 ind
icator may be mounted on the air
cleaner housing or in a remote location.
g00103777
Illustration 59
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 approximately 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 plugged.
The service indicator may need to be replaced
frequently in environments that are severely dusty, if
necessary. Replace the service indicator annually
regardless of the operating conditions. Replace the
service indicator when the engine is overhauled, and
whenever major engine components are replaced.
Note: When a new service indicator is installed,
excessive force may crack the top of the service
indicator. Tighten the service indicator to a torque
of2N·m(18lbin).