CCV, am I missing something?
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Senior User
Joined: May 2012
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From: Decatur
CCV, am I missing something?
Ok so I was looking at doing the CCV mod with a catch can and a breather filter. Well I was looking at a bunch of threads and I got some great ideas that are very simple and very cheap. Well it got me thinking and I was wondering if I could just pull the hose end that goes to the intake tube and put a breather filter on the end of that then plug the hole in my intake tube. Is there a reason not to do that?
FTE Legend
Joined: Jan 2009
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From: Norlina NC
you really dont want to plug the hole as it could lead to some other nasty events if the plug doesnt pop free under pressure... problem with just putting a filter on top of the valve cover too results in oily mess all down the side of the engine after the filter gets saturated... your pretty much stuck doing 1 of 3 things.. leave it as it.. vent to the ground (which if you have emission inspections and they find this it can be an instant fail regardless if they snorkel the exhaust) .. or do one of the many different catch can methods..
FTE Legend
Joined: Jan 2009
Posts: 80,542
Likes: 97
From: Norlina NC
when theyre re-routing its going to a catch can and then back to the intake, or straight to ground.. the problem with just pulling the tube and plugging the covers itself is it can lead to too much pressure building up inside the engine which will then cause various seals to blow out.. ive seen a couple use 1 way valves as plugs where itll vent to the atmosphere to relieve the pressure.. but results in the same mess all over the place when the oil vapors get released..
Laughing Gas
Joined: Feb 2016
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Since it's upstream of the turbo I wouldn't see pressure popping it out unless you had a turbo fart, even then I can't imagine much pressure is present because it would also have a path back to the crankcase through the CCV tube, which is something you would have thought Navistar would have looked at.
I'd be more concerned about building pressure in the crankcase due to a clogging vent. Breather selection would be critical. On some of the industrial equipment trains I work on, it can take very little backpressure in the reservoir to slow down other oil users that gravity drain back to the reservoir, so you wind up pooling oil where it shouldn't be. A positive pressure crankcase will also be likely to spit oily vapor out shaft projections through the crankcase, like crankshaft oil seals.
I did have a boot blow off on my last tow, so getting rid of the oil in the system looks like a plus, but the systems that appear to be well thought out seem to cost more money than some degreaser, a 7/16 socket, 1/4" ratchet, and some cuss words.
I'd be more concerned about building pressure in the crankcase due to a clogging vent. Breather selection would be critical. On some of the industrial equipment trains I work on, it can take very little backpressure in the reservoir to slow down other oil users that gravity drain back to the reservoir, so you wind up pooling oil where it shouldn't be. A positive pressure crankcase will also be likely to spit oily vapor out shaft projections through the crankcase, like crankshaft oil seals.
I did have a boot blow off on my last tow, so getting rid of the oil in the system looks like a plus, but the systems that appear to be well thought out seem to cost more money than some degreaser, a 7/16 socket, 1/4" ratchet, and some cuss words.
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