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Unread 09-02-2013, 04:33 PM   #1
rubidriver
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Sealing the valve cover breathers?

I notice that the valve cover breathers on all my TJs have leaked and have a lot of free motion which makes them leak oil and collect dirt. Im sure dirt also enters through these spots as well. The best thing I can think of is having an aluminum cover and welding a breather pipe on it which would certainly not leak. Have you guys came up with any solutions for the stock cover?

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Unread 09-02-2013, 04:51 PM   #2
redvett94
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Just replace the gromets and your good to go.
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Unread 09-02-2013, 07:27 PM   #3
RDaniel2405
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You should just replace the rubber grommets, but you should know on 2003-2006 that those are not the same part numbers (front and rear). The front is free flowing, the rear has a small valve to limit air flow for your EVAP system.

If it was me, and what I did replaced all 4 parts (2 rubber grommets and the 2 PCV elbow pieces) when I did my valve cover gasket. I also got my parts from the local dealer, I didn’t want to use the Dorman ones form advanced auto, the Dorman ones are different form the Mopar ones.

If you put the wrong PCV in the rear, your jeep will have a high idle, and the check engine light will come on. I know because I have tried it.
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Unread 09-03-2013, 02:45 AM   #4
Knuckelhead
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Quote:
Originally Posted by RDaniel2405 View Post
You should just replace the rubber grommets, but you should know on 2003-2006 that those are not the same part numbers (front and rear). The front is free flowing, the rear has a small valve to limit air flow for your EVAP system.

If it was me, and what I did replaced all 4 parts (2 rubber grommets and the 2 PCV elbow pieces) when I did my valve cover gasket. I also got my parts from the local dealer, I didn’t want to use the Dorman ones form advanced auto, the Dorman ones are different form the Mopar ones.

If you put the wrong PCV in the rear, your jeep will have a high idle, and the check engine light will come on. I know because I have tried it.
TJ's don't have the PVC system, they have the CCV system. There is no valve, it does have an orifice that restricts vacuum draw from the intake manifold.

I've had good results with placing an "O" ring under the CCV plastic port to prevent leakage...
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