CCV mod
Super Moderator
Joined: Dec 2011
Posts: 13,325
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The simplest way to find out the purposes of a CCV trap... it to read the literature of the professional manufacturers who engineer CCV traps commercially.
Au250 already provided a link to Parker Hannifin's Racor Division, and there are literally dozens more documents where that came from. amounting to at least 100 pages of reading.
Alternatively, a different manufacturer puts one purpose of a CCV filter succinctly in a single page brochure:
(Yellow highlights added)
In California, a CCV filter was REQUIRED to minimum meet diesel emissions retrofit standards, depending on year, tier, engine family, and application (commercial vehicles).
Hotshot
Joined: Jul 2008
Posts: 12,782
Likes: 2,142
From: N.GA Mountains
Hair spray is NEVER needed.
If you clean boots and pipes correctly then assemble with a little wet brake cleaner - the boots do not come off.
Its Comin Right for us!
Joined: Feb 2005
Posts: 12,198
Likes: 2,657
From: GA
Mountain Pass
Joined: Jul 2019
Posts: 199
Likes: 33
From: Northern California
My truck came to me with the BD Diesel CCV system installed. I just replaced all the boots and there was very little oil in the pipes and really only on the hot side. Looked like old residual. So I can say with confidence that it really works to separate the oil because the little bitty catch can fills up before the next oil change. I made a larger catch can out of 2" pipe that holds about a quart. I learned the hard way that letting the catch can over fill is a bad idea....Oh and that flimsy little drain valve will open just by looking at it! Got me wet twice while working on other stuff.
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