SEBU7899-05 79 Maintenance Section Engine Air Cleaner Service Indicator - Inspect Do not use paint, a waterproof cover, or plastic as a protective covering for storage. An airflow restriction may result. To protect against dirt and damage, wrap the primary air cleaner elements in Volatile Corrosion Inhibited (VCI) paper. 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. Place the primary air cleaner element into a box for storage. For identification, mark the outside of the box and mark the primary air cleaner element.
Include the following information: The red piston locks in the visible position. Test the Service Indicator Date of cleaning Service indicators are important instruments. Number of cleanings Check for ease of resetting. The service indicator should reset in less than three pushes. Store the box in a dry location. i01900118 Engine Air Cleaner Service Indicator - Inspect (If Equipped) 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. SMCS Code: 7452-040 Some engines may be equipped with a different service indicator. 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.
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. 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 of 2 N·m (18 lb in).
The service indicator may be mounted on the air cleaner housing or in a remote location. g00103777 Illustration 41 Typical service indicator