PCV
#3
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Location: Richmond
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Year: 1991
Model: Cherokee
Engine: 4.0
#6
just to chime in, its been posted a lot, but they WILL break when you take them out. If you are really careful you might be able to salvage them. I too thought I was going to be different and get them out with no problems, and 10 min later I was driving to the parts store.
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#7
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Year: 1991
Model: Cherokee
Engine: 4.0
just to chime in, its been posted a lot, but they WILL break when you take them out. If you are really careful you might be able to salvage them. I too thought I was going to be different and get them out with no problems, and 10 min later I was driving to the parts store.
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Ben
#11
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Year: 1998
Model: Cherokee
I changed them out on my 94 i had, and it caused my valve cover gasket to blow out and leak really bad. I was later told Its not a good idea to change them because that happens alot
#12
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Year: 94
Model: Cherokee
Engine: 4.0
Don't see how it could blow out valve cover gasket. Without vacuum at the rear metered port, the crankcase will just breath through the front breather tube and dip stick tube causing blow by and a oily air filter. but not build enough pressure to blow out gaskets. We used to run V8 powered race cars all the time without a PCV
#13
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Year: 2000
Model: Cherokee
Engine: 4.0L
If the PCV system isnt working the crankcase will be pressurized, and will cause leaks at all the gaskets.(Or the weakest one!). You need Vacuum on the crankcase at all times. The PCV valve is only to seperate the oil so it doesnt "Suck" oil.
If the engine has more Blowby than the PCV can handle then you will also have positive pressure in the crankcase...
This is one of the most important "Invisible" systems on the motor. Everyone overlooks it !
If the engine has more Blowby than the PCV can handle then you will also have positive pressure in the crankcase...
This is one of the most important "Invisible" systems on the motor. Everyone overlooks it !