Mercury E1DZ-6A666-A Valve Assembly

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Hydrocarbon emissions are reduced by the Positive Crankcase Ventilation (PCV) system which scavenges crankcase vapors, passes them through the air cleaner, and mixes them with blow-by gases before redirecting them back to the intake manifold through a PCV valve. The main components of the PCV system are, fresh air filtered inlet, vacuum hoses connecting these two components with the engine and EECS system, and PCV valve. The flow is restricted when there is high intake manifold vacuum so as to maintain idle quality, this is achieved by using PCV valve. When abnormal operating conditions occur, the system allows excessive amounts of blow-by gases to pass back into the air cleaner through the crankcase vent tube for normal combustion.

The PCV system directs vapors and blow-by gases from the crankcase into the intake manifold, where they mix with the air/fuel charge and undergo combustion.

When transferring the elbow from the old PCV valve to a new one, it may need to be soaked in warm water for up to an hour to make it easier to slip onto the new valve. Forcing the elbow onto the valve should be avoided to prevent breakage.

In abnormal operating conditions, the PCV system is designed to allow excessive amounts of blow-by gases to flow back through the crankcase vent tube into the air cleaner to be consumed by normal combustion.

If no vacuum is felt, check for vacuum leaks at the valve, filler cap, and all hoses. The oil filler cap, hoses, or valve cover gasket may be leaking, or the PCV valve may be bad.

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.

The purpose of the PCV system is to reduce hydrocarbon emissions by scavenging crankcase vapors and circulating fresh air through the crankcase.

Clean the hoses and check the PCV valve at the intervals recommended in the maintenance schedule.

By pulling it out of the valve cover and shaking it. If it rattles, reinstall it in the cover.

Cleaning the valve should only be done in "emergency" situations.

The system recirculates combustion gases from the crankcase back into the combustion chamber, preventing engine oil contamination and environmental pollution from unburned hydrocarbons.

The system is designed to allow excessive amounts of blow-by gases to flow back through the crankcase vent tube into the air cleaner to be consumed by normal combustion under abnormal operating conditions.

Check for vacuum leaks at the valve, oil filler cap, hoses, and valve cover gasket. The PCV valve may also be bad.