How the PCV System Works ( PCV Valve )

This Video explains How the PCV System Works.
PCV stands for: Positive Crankcase Ventilation.
Video also explains how the Plunger inside the PCV Valve is operated by a Spring and Engine Vacuum.

#PCVValve #PCV #Howstuffinmycarworks #JLSportTrucks

[Stefancy]

College would of been more interesting if my professors used a screwdriver as a pointer like you!

[tyronenur]

Best explanation I’ve come across. Quick and straight to the point without any unnecessary complications. Thanks !!

[cybersight]

With so many videos out there this is probably one of the few that has a good diagram and explanation. Thanks man. Keep it up.

[erin]

I had a small oil leak that the clowns at Firestone Auto claimed were leaking valve cover gaskets at $300 a piece, front and rear. Needless to say their diagnosis was bogus. I ignored it until I saw this video. So it was my PCV valve that caused the oil leaks, as I was too find out. Needless to say I have dropped Firestone from my list of service stations to depend on. My car is 12 years old and runs good, with 170k hard miles on it. Thanks! I never would have guessed the PCV valve to cause the oil leaks.

[josephpinal]

I thank you for this video, you solved my mysterious oil leak when I ran my engine hard ( abc 383 stroker ) I don't know when or why I eliminated the air intake for my pcv system, after I watched your video I realized what I had done. I restored the air in and now problem solved !!! no more oil leaks !!! thanks again

[MTAYLOR]

This video solved answered two questions of mine that have kept my 1979 302 engine from working properly all this time. An old timer told me this was probably what was going on but I didn't understand how this system worked. Thanks for making this video...saved me a ton of time and frustration!

[natshain]

Best PCV Valve function demo I ever seen. Thank you, Nat

[Dechieftian]

That's everything I needed in understanding a positive crankcase vent .. thanks! Great sketch, great instruction. Keep it going.

[junxu]

I would like to add a little to it. The bore distortion will also cause high blow-by. It is seen at high RPM and high load condition.
Secondly the every PCV system has reverse flow condition when the crankcase pressure become positive. Normally It happens when engine operates above 5000rpm with wide open throttle. The pressure in the intake manifold is close to atmosphere so the suction in the fresh side is greater than dirty side PCV. The blow by gas starts flowing out through the fresh hose to induction pipe.

[Michael_Lorenson]

Excellent, thanks. So many people stand in front the engine in their car and attempt to describe the system, and the info is hard to organize and absorb into my little, teeny tiny brain. If they make mistakes (not uncommon), it's just that much worse. Your diagram and presentation are thorough and clear.

[jamiejenkins]

I tried to tell this to so many people and they just don't get it. Thanks so much brother wonderful video and wonderful explanation

[discoverywii]

Man you should be mechanic profesor that the best video about PCV valve function in YouTube

[Tropicsca]

There are so many things that cause engine problems but I think if I just try cleaning these suction tubes and replacing my PCV valve it might fix or at least prevent so many problems...thanks for the great video

[maz]

Very well illustrated!
Thanks for this video!

[vijayam]

Brilliant. Much simpler to understand.

[chrishernandez]

Thank you for this! I already knew what the PCV valve was for but I had no idea why there was a second hose on the other valve cover. After watching your video I now know that its just a fresh air source to aid flow for the pcv valve

[danhennis]

I think you may have missed a 5th cause. It is that of worn or loose valve guides. I have experienced this in several older V-8 and V-12 engines. But thank you for a clear explanation of the basic system.

[hardcoretrout]

Finally I understand reason one of the valve covers has a tube without the valve....I was thinking they both performed same task but now know better

[mule]

This was a great explanation, thank you very much.

[ryans]

I’ve always wondered what that extra hose was on my intake thank you for explaining it