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Oil Catch Can

5K views 17 replies 11 participants last post by  wkearney99 
#1 ·
Can you put a oil catch can on the 4.7 are is that just for the bigger 5.7 & 6.1 engines? & will it do the 4.7 any good? I have asked a few ppl. & nobody can give me an answer. Everybody i talk to says good question. So can somebody give me an answer? Thanks for any info.
 
#4 · (Edited)
You can put a catch can on anything that has a Positive Crankcase Ventilation (PCV) system....I believe everything today has it. They do work, especially in the winter months, and you'll also catch more at higher speeds. I just got back from an 800 mile trip with my 5.7. Before I left I had changed the oil/filter and emptied the catch can. Upon return, oil level had not changed (still full), but I had about 4 oz. of water/oil mix (mayonaise) in the catch can. Without the catch can this crap is cycled into the intake manifold and through the combustion process. It makes a mess of the intake runners and the back side of the throttle body gets caked with crap. Check yours, with the engine off, by removing the intake tube at the throttle body and manually opening the throttle butterfly. Look at the back of the butterfly and shine a light into the runner area of the manifold, if you can. On the 5.7's some will even see puddling of this crap in the manifold, and I'll guarantee that the back of the butterfly will be crapped up. I've had catch cans on my Hemi WK since I bought it ~12,000 miles ago and on my Hemi LX for about 5 years. I will not go without one on any future vehicle either.
 
#5 ·
Thanks for the info buddy. I will probably be getting me one.
 
#10 · (Edited)
I concur....Billet Tech. http://www.billettechnology.com/ is about the best out there. They can be adapted to most applications if you can't find one for your exact model. The one for my WK is for an LX hemi, since when I bought mine they didn't offer one for the WK. I would think that the higher the mileage, the more need for it, as the PCV valve will certainly be passing more by-products through it. Also, make sure your PCV valve is well maintained and replaced as needed/required. If there is any doubt in your mind, I would recommend that you check behind the throttle butterfly on the throtte body, as I indicated in my post above. If it's all crapped up, IMO, you need one.
 

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#11 ·
I did notice that my TB was very dirty. I also read that it was bad to try to clean it out (ruins the sensors or something like that). I'll be getting the Catch can in the very near future! Also have to try to figure out how to replace the PvC valve last time I went to the parts store, they told me I don't have one! lol
 
#13 · (Edited)
Several of us with the 5.7 have custom mounted them in different ways. The picture above is how I did mine, and what it looks like with the engine cover on. As you can see the lines go under the cover. Here's a pix with the cover off. Note, you can barely see the PCV valve housing on the intake, on the passenger side, in the back. The valve takes a quarter turn counter clockwise to remove it. The PCV valve for the 5.7's are generally not available at parts places. Most don't even show a listing. The dealer is the best place to get it. I was able to get one from Napa Auto, but it is the Mopar part, not an aftermarket version.

As far as cleaning the throttle body goes, it can be done. Many of us have done it, but it must be done with care, a soft rag or brush, and a mild solvent or rubbing alcohol. Some remove it to clean, but I didn't. Once you've cleaned it, installed and properly maintain the catch can, you should never have to do it again. In about 5 years on my Hemi LX, I've just gotten a very light film that easily wipes off with a soft rag. Do a search and you should find a "how to" on this or one of the other Jeep forums.
 

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#17 ·
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