(Wikipedia) “A crankcase ventilation system removes unwanted gases from the crankcase of an internal combustion engine. The system usually consists of a tube, a one-way valve and a vacuum source (such as the inlet manifold).”

“The unwanted gases, called “blow-by”, are gases from the combustion chamber which have leaked past the piston rings. Early engines released these gases to the atmosphere simply by leaking them through the crankcase seals. […]  Positive crankcase ventilation (PCV) systems— first used in the Second World War and present on most modern engines— send the crankcase gases back to the combustion chamber, as part of the vehicle emissions control, in order to reduce air pollution.”

The pickup got a little love today as well. Raising the hood was always a bit of struggle but the new hinges made it so stiff I had to use a tire iron to pry the hood up. A new hood spring fixed the problem.