Engine Air Cleaner Service Indicator - Inspect; Engine Ground - Inspect/Clean; Engine Mounts - Inspect - Perkins 1103AA-33G Operation And Maintenance Manual

60
Maintenance Section

Engine Air Cleaner Service Indicator - Inspect

6. Install end cover (4) to air cleaner body (2) and
secure end cover. If necessary, reset the air
service indicator, refer to this Operation and
Maintenance Manual, Engine Air Cleaner Service
Indicator - Inspect for more information.
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 35
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
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service indicator will not reset, the hole for the service
indicator may be restricted.
The service indicator may need to be replaced
frequently in environments that are severely dusty.

Engine Ground - Inspect/Clean

Inspect the wiring harness for good connections.
Perkins use the starter motor in order to ground the
engine. Check the connection on the starter motor at
every oil change. Ground wires and straps should be
combined at engine grounds. All grounds should be
tight and free of corrosion.
• Clean the grounding stud on the starter motor and
the terminals with a clean cloth.
• If the connections are corroded, clean the
connections with a solution of baking soda and
water.
• Keep the grounding stud and the strap clean and
coated with suitable grease or petroleum jelly.

Engine Mounts - Inspect

Note: The engine mounts may not have been
supplied by Perkins. Refer to the Original Equipment
g00103777
Manufacturer (OEM) information for further details on
the engine mounts and the correct bolt torque.
Inspect the engine mounts for deterioration and for
correct bolt torque. Excessive engine vibration can
be caused by the following conditions:
• Incorrect mounting of the engine
• Deterioration of the engine mounts
• Loose engine mounts
Any engine mount that shows deterioration should be
replaced. Refer to the OEM information for the
recommended torques.
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