PCV question - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 12-09-2000, 02:29 PM Thread Starter
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PCV question

I have a stupid question about pcv valves. Are they designed to let air flow only one way, like if you take it off you should be able to suck air through it but, if its good, can you blow air through it. Thanks

I need to get a girlfriend I'm getting to close to my jeep.
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post #2 of (permalink) Old 12-09-2000, 02:50 PM
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Re: PCV question

The one's I've seen do not completely seal off. Jeeps like to plug their's up. I have 2, one in use, the other soaking in kerosene. I swap 'em every now and then.
They should rattle when clean.
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post #3 of (permalink) Old 12-09-2000, 02:58 PM
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Re: PCV question

The PCV, as I understand it, allows flow from the crankcase to the carb/intake to reburn blowby gases and any fuel condensation. It also will act as a check valve in case of a backfire in the intake, thus preventing a fire or explosion in the crancase. Anyone who has ever seen the results of this understands the importance of this function. I once saw an old Oldsmobile on which the owner had installed an electric fuel pump between the tank and defective mechanical pump (too lazy to bypass the bad pump; hey, it ran) The crankcase filled with fuel and when it went off the valve covers left dents in the hood and the oil pan was blown almost flat. Not pretty.

76 CJ5,2.5" lift/Rancho 9000's,258/T-177/D300,HEI,Offy,Locked F&R
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