59830A 8 Mercruiser YOKE ASSEMBLY (COUPLER END)

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Typical air cleaner service indicator that is mounted on the air cleaner housing
An air cleaner service indicator may be mounted on the air cleaner element or in a remote location.Some vessels are equipped with a low air pressure indicator that monitors the inlet air pressure. This indicator measures air pressure before the air is drawn through the air cleaner element. Then, the indicator monitors the pressure level after the air has passed through the air cleaner element. As the air cleaner element becomes dirty, this air cleaner pressure differential rises. Some vessels may be equipped with a different air cleaner indicator.If your vessel is equipped with a different type of air cleaner indicator, follow the recommendations for the vessel. You can also follow the recommendations in the air cleaner OEM in order to service the air cleaner element.
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Typical Air Cleaner Service Indicator
Observe the air cleaner service indicator. You should clean the air cleaner element, or you should replace the air cleaner element under two conditions:
The yellow diaphragm enters the red zone.
The service indicator displays the red color at any time.
The red piston locks in the visible position.Test the Air Cleaner Service Indicator
Air cleaner service indicators are important, inexpensive instruments. Two methods can be used to test the service indicator.
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 rpm. The yellow core should latch at the approximate greatest vacuum that is attained.The air cleaner service indicator should be replaced under certain conditions and at certain times:
The service indicator does not reset easily.
The yellow core does not latch at the greatest vacuum.
The engine is used for a year.
The engine is overhauled.
Major engine components are replaced.Note: Replace the air cleaner service indicator often whenever you operate in a severely dusty environment.If the new service indicator will not reset, the hole for the service indicator may be plugged.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).Service the Air Cleaner Service Indicator
Never run the engine without an air cleaner element installed. Never run the engine with a damaged air cleaner element. Do not use air cleaner elements with damaged pleats, gaskets or seals. Dirt entering the engine causes premature wear and damage to engine components. Air cleaner elements help to prevent airborne debris from entering the air inlet.
Never service the air cleaner element with the engine running since this will allow dirt to enter the engine.
If the air cleaner element becomes plugged, the air can split the filter material. Unfiltered air will drastically accelerate internal engine wear. Your Caterpillar dealer has air filter elements for this unit. Consult your Caterpillar dealer for the correct air cleaner element.If the air cleaner service indicator appears red at any time, clean the air cleaner element or install a new air cleaner element. At 250 hour intervals, clean the air cleaner element or replace the air cleaner element .Refer to the Operation and Maintenance Manual (Maintenance Section) for more information on servicing the air cleaner element.