Mercury 2X4Z-6A666-AA Valve Assembly

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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.

The intake manifold should be removed and the PCV hose should be disconnected from the valve.

The PCV valve is an integral part of the crankcase vent oil separator, which is located on the front side of the engine block.

Tighten the oil vent separator bolts securely.

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.

Remove the upper intake manifold.