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Old 03-15-2017, 12:00 PM   #1
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oil catch can?

Hey guys, was just wondering, do they make an oil catch can for the third gen
Hemi? the guy who owned my truck before me put a CAI on it, and it has a little air breather/filter thing attached to a short hose coming off the oil filler neck. I'm guessing that's a bypass of the PCV valve. Only problem is, the breather (and that whole side of the engine) is caked with all old, crusty, gunky oil. I want to go back to using the PCV system, but I don't want the blow by gasses going into the throttle body and gunking that up. Would a catch can solve this? And if so, do they make one for the third gen Hemi? Any advice/info would be greatly appreciated!

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Old 03-15-2017, 02:16 PM   #2
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That tube normally connects to the intake tube. Sticking a small breather on it is very common and simply vents to atmosphere. The pcm is located on the intake manifold passenger side just behind the TB. It is a twist and pull style. There is no hose, it's all internal. What isn't common is the small vent filter with oil on it. I would clean up the engine to determine the source of any blowby . Good luck.
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Old 03-16-2017, 05:42 AM   #3
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Thanks Redtruck for the reply. So I'm guessing that by venting to atmosphere, it simply lets the blow by gasses escape, rather than sending them back to the intake tube? Come to think of it, the intake tube does have a small nipple with a rubber cap on it, I assume that's where you'd hook up a hose if so desired. My next question is, does the CAI in any way affect the PCV valve? I would guess no. As far as that gunked up breather, I'll have to wait for some nicer weather, and give all of this snow we got a chance to melt!
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Old 03-16-2017, 06:00 AM   #4
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The cai doesn't affect the pcv. The pcv is all internal of the manifold. There is some deposit in the TB over time and occasionally needs cleaning. I've used small filter vent for many years and have yet found one dirty. The hemi are pretty tight engines.
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Old 03-16-2017, 07:05 AM   #5
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Wow, exact same setup as mine, but I never saw it that clean! I definitely have to get in there with some degreaser, and go to work. Could the gunk be caused by excessive blow by? And if so, what causes that? Bad rings? Sorry for so many questions, I really appreciate the input.
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Old 03-16-2017, 07:19 AM   #6
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That's far from being clean... lol its also an old picture. I don't use that manifold any longer. But it's still simply vented to atmosphere. I've tried different setups and have found that keeping it simple works good.
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Old 03-16-2017, 08:35 AM   #7
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This is the setup I have run for the past three years, works great and keeps blowby gasses and oil from being sucked into the throttle body. You also need to check the inside of that breather filter, it's smaller diameter than the outer surface, and will get dirtier than the outside surface.
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Old 03-16-2017, 09:04 AM   #8
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Yep, that's all that's needed.
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Old 03-16-2017, 10:53 AM   #9
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On a 4th gen the catch can goes between the pcv valve and the manifold. Very tough to do on a 3rd gen because the pcv goes straight up into the bottom of the manifold. If you put a catch can on the tube that goes to the filler neck you'll catch mostly water that condenses out on the inside of the can, basically doesn't do much.
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Old 03-16-2017, 12:01 PM   #10
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Quote:
Originally Posted by Redtruck-VA View Post
Yep, that's all that's needed.
- use whatever variation you desire - a quick simple fix .

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