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Re: Crankshaft vent
Positive crankcase ventilation. It uses engine vacuum to suck the fumes moisture and other bad stuff out of the crank case. If pressure is allowed to build up inside the engine it can cause oil leaks by pushing out the gaskets. Way back in the day they used a road draft tube which basically just let oil blow out of the engine onto the ground which served as the vent but that isnt the best way for obvious reasons.
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Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.
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