![]() ![]() ![]() In this system air enters the crankcase through a crankcase breather tube. PCV was the earliest emission control system, first appearing on cars in 1961. In the past these gases were allowed to escape from the engine block through a “road draft tube”, but since they contain hydrocarbons (HC), when it was realized in the 1950s that HC was a major cause of smog, a new method for ventilation was needed. These gases also mix with moisture in the crankcase to form compounds that are destructive to the engine lubricating oil, causing sludge to form. This causes pressure to build up inside the crankcase, which if not provided a path for exit, would instead escape past seals and gaskets, causing engine oil leaks. These gases must be allowed to escape from the crankcase or pressure could build up causing gaskets and seals to fail resulting in leaks, and to prevent oil contamination which could reduce the oil’s effectiveness and usable lifespan.Īll engines, no matter how new or well-maintained, have a certain amount of “blow-by”, where some of the gases from the combustion chambers leak past the piston rings and cylinder walls. Once I removed the hose clamps and straightened out the spaghetti, it came out easily - and better news is the. the connection to the heated intake port for the gasses also will have a hose clamp on it. ![]() The PCV (Positive Crankcase Ventilation) system channels harmful crankcase vapors to the air intake in a controlled manner so they can be burned along with the air/fuel mixture. You will need to reach behind the intake to remove the large bore hose from the throttle body as well as the smaller hose from the fuel line. 350 Chevy Small Block Gen II (4.00 Bore Family). ![]()
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