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Old February 21st, 2013, 21:18
freerider15's Avatar
freerider15 freerider15 is offline
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Join Date: Jan 2004
Location: FoCo, Crawlorado
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How To: Build A Cheap Rollover Catch Can / Breather

Been a while since I've done a write-up (Cut and Fold Rear Quarter Panels) so how about another.

Alright, so I cannot remotely take credit for this. I got the idea from a thread on Pirate:

http://www.pirate4x4.com/forum/gener...nder-15-a.html

But, since I know most of you don't venture there...I'll go ahead and post the build up of mine now

So a list of what you'll need (minumum):

* Aluminum Water bottle - Free in my case thanks to CSU
* Breather Filter - $6.32 + tax after 40% off at Advance Auto
* PCV Valve (PN# PCV1122) - $2.99 + tax at AutoZone
* 3/4" x 1/2" Hex Bushing - $1.95 + tax at Home Depot
* 3/8" ID x 1/2" MIP Brass Hose Barb Adapter - $3.12 + tax at Home Depot

So, total for the main stuff (if you have bottles free like I did):

$14.38

So on to the "build":

An overall picture of everything:









So I did think slightly differently than the write-up on pirate, not by much though. You can either go the route in the pirate thread, or follow mine.

First things first. I smoothed out the small nipple lip on the PCV valve, then tapped it to 3/8x16.

*Note...the smaller part of the PCV valve measures out to about .350 so not completely .375 but taps just fine...you'll see where this makes a difference in a few. As well...the PCV valve is a one way valve so the internal "ball" will prevent it from leaking out in case of a rollover.

After it has been tapped:



Now...drill a hole in the center of the bottom of the bottle. Since the piece isn't really 3/8", I used a size T(~.358") drill bit for a better, tighter fit.



From here, I assembled like so with washers and o-rings for sealing. You can do as you like...this is just what I did.



Now...it isn't the easist to get done inside the bottle but I figured out my own little tricks and it goes pretty quick.



Next, assemble the two adapters together and screw into the neck of the bottle. I used RTV between all threads, but you can use whatever you feel like...RTV, JB Weld. Whatever makes ya feel better



Last but not least...put the filter over the piece of the PCV valve sticking out and viola...done!



OK...so a few more side notes. The filters I got didn't like to go on real easy. So to get them on I had to use a heat gun to get the rubber maleable then push it on. In order to get it more "flush" as shown below...I had to drill the rubber out to a larger hole (~1/2"), then heat and push. But, once done it comes out a little nicer like so:



I'll get them mounted soon and add some pictures!
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