Mercury 2L3Z-6A666-AA Valve Assembly

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The Positive Crankcase Ventilation (PCV) system reduces emissions by circulating fresh air from the air cleaner through the crankcase, mixing with gases, and rerouting through a PCV valve to the intake manifold. The system includes a PCV valve, a fresh air inlet, and vacuum hoses. The PCV valve restricts flow to maintain idle quality. If anything odd occurs, the system allows excess gases to flow back into the air cleaner. It is required that regular checking and replacement of the PCV valve happens.

To maintain efficient operation of the PCV system, clean the hoses and check the PCV valve at the intervals recommended in the maintenance schedule. The PCV valve is located in the right (passenger's side) valve cover. Check the valve by first pulling it out of the valve cover. Late models are equipped with push-connect fittings on the PCV hoses - rotate the tab to unlock the fitting. Shake it - if it rattles, reinstall it in the cover. Start the engine and allow it to idle, then disconnect the PCV hose from the air cleaner housing and feel for vacuum at the hose. If vacuum is felt, the PCV valve/system is working properly. If no vacuum is felt, the oil filler cap, hoses, or valve cover gasket may be leaking or the PCV valve may be bad. Check for vacuum leaks at the valve, filler cap, and all hoses. Pull straight up on the valve to remove it. Check the rubber grommet in the rocker arm cover for cracks and distortion. If it's damaged, replace it. If the valve is clogged, the hose is also probably plugged. Remove the hose between the valve and the intake manifold and clean it with solvent. After cleaning the hose, inspect it for damage, wear, and deterioration. Make sure it fits snugly on the fittings. If necessary, install a new PCV valve. Install the clean PCV system hose. Make sure that the PCV valve and hose are secure.

To sustain the efficient operation of a PCV system, it must be kept clean and its hoses checked according to the maintenance schedule. First, start the engine then disconnect the PCV valve from the intake manifold and check for vacuum. You will feel a vacuum if it is working properly. If there isn't any vacuum remove the hose to see if there is one inside it. Replace the valve if the hose has suction but not the valve itself. Find out whether a hose is blocked or broken by checking for suction at its ends. Inspect the grommet for damage and replace it as necessary. Clean and inspect the hose ensuring a snug fit. Install a new PVC valve as may be necessary.

The rubber grommet should be checked for cracks and distortion.

The PCV system works by circulating fresh air from the air cleaner through the crankcase, where it mixes with blow-by gases. It is then rerouted through a PCV valve to the intake manifold.

The PCV system achieves this by circulating fresh air from the air cleaner through the crankcase, where it mixes with blow-by gases and is then rerouted through a PCV valve to the intake manifold.