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Unread 04-04-2014, 12:54 PM   #1
rjf1978
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1984 CJ7 
 
Join Date: Feb 2014
Location: brandon, Florida
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PCV Help please

The front hole in the valve cover (like the rear one where the PVC valve is) had a filter installed buy the PO. Well that filter gets saturated with oil vapor and drips oil onto the valve cover. My question is...can I just get another piece of tube and install a "Y" connection to tie it in to the PVC tube? Or as a general question...what am I supposed to do with this hole?

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Unread 04-04-2014, 01:29 PM   #2
crouse11c
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First throw the breather in the back and the PVC valve in the front. Also make sure the PVC valve is working by shaking it and listening for a rattle. If it rattles good to go if not inspect and or replace.
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Unread 04-04-2014, 01:43 PM   #3
Ken4444
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Crankcase vapor, gas, fumes should be drawn through the PCV valve. Outside air should be drawn in through the other hole, ideally through some kind of filter. As the previous reply suggested, make sure the PCV valve rattles. Also make sure the PCV valve is correctly connected to a vacuum source so that it does draw vapor out of the crank case.
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Unread 04-04-2014, 01:43 PM   #4
Mike Romain
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The engine has an in and an out. The filter should be on the rear as mentioned. Most covers have a baffle under the hole so not too much blow by gets out.

Excessive blow by can mean the engine is getting tired or the charcoal canister (gas tank vent) purge valve has worn out or it is plumbed wrong. This should be T fitted to the pcv line behind the carb. To test, pinch it shut at idle and the idle shouldn't change.
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Unread 04-04-2014, 02:42 PM   #5
rjf1978
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Thanks for the info everyone. I moved the Pcv valve to the front hole. It does rattle. As it turns out the Pcv valve was not seated properly. I'm just trying to figure out lots of things on this jeep because the PO took off all the emissions stuff. Hoping some of you will chime in on what's been done or hasn't been done. Pictures to follow. Thanks.
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Unread 04-04-2014, 02:49 PM   #6
rjf1978
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Unread 04-04-2014, 03:58 PM   #7
Tigerjeep79
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Those little Cal Custom air cleaners annoy me. They don't help performance any, and there's no way to plumb the breather hole in the valve cover to the air cleaner like the factory did. You'd probably be happier with the factory type.
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