Mercury D9OZ-6A666-A Valve Assembly

First of all, a crankcase emission control system comprises of a PCV valve, sealed oil filler cap, and connecting hoses. This keeps engine oil from getting contaminated or polluting the environment by redirecting combustion gases back into the combustion chamber. To ascertain that the gas flow is regulated and unhindered, check for blockage and damage in the PCV valve. To take off or replace it, you should take it away from the rocker cover grommet, remove it from the hose pipe, clean if necessary, and put it back in place.