Mercury 2L3Z-6A666-AA Valve Assembly

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 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 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.

The heating element is bolted to the intake manifold, with the PCV hose from the left valve cover attached to it.

If necessary, a new PCV valve should be installed.