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Pcv Catch Can Installed

DaveH71

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Mossyoakglock Senior Enthusiast

Mossyoakglock

Posted
Posted

I noticed something about my catch can tonight when I got home. My truck was idling and i walked to the front of my truck and I could hear a hissing coming from the location where I mounted my can. I popped my hood and the hissing was definitely coming from the catch can. I checked all the hoses and fittings, the top and the drain plug and there was no air leaking anywhere. I came to the conclusion that you could just hear the air going into the can since it's at the front of the truck.

 

Has anybody else noticed their catch can making a hissing noise?

 

cujo8, can you hear your can hissing a little since yours is mounted on the fender wall?

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dlstewart01 Senior Enthusiast

dlstewart01

Posted
Posted

Usually when that happens you have the drain cock on the bottom open. You need to turn it in the opposite direction to close it. Wonder how I know this....

cujo8 Enthusiast

cujo8

Posted
Posted

I don't believe there is any hissing noises coming from the can, but I will check tomorrow and let you know. Make sure the petcock drain is closed as Snakedoctor suggested. It may seem counter intuitive, but the petcock will be closed when screwed all the way out to the fully extended position. Did you use Teflon thread tape on all the fittings? Also I read a post about catch cans on another site and one person found that the petcock that came with the catch can he purcased (not an AMW kit) had a bad petcock from the factory and he picked up a new one from a local home center and the problem was solved.

 

One way to test for a vacuum leak is you can spray some starting fluid (ether) around the catch can fittings and if the idle goes up on a certain fitting you've found the leak, but don't go too fast with this procedure, since the hose length may cause a delayed response. Some folks like to use an unlit butane torch for this, since there is no messy spray to contend with.

Mossyoakglock Senior Enthusiast

Mossyoakglock

Posted
Posted

Nope, no leaks anywhere. I used teflon tape on all fittings and put my hand and fingers around all connections and there was no air leaking from any fitting.

 

I also made sure that my petcock was closed and it was because i put my finger on the very end/bottom and could not feel any air or moisture. It might just be the air being forced into the can.

cujo8 Enthusiast

cujo8

Posted
Posted
Nope, no leaks anywhere. I used teflon tape on all fittings and put my hand and fingers around all connections and there was no air leaking from any fitting.

 

I also made sure that my petcock was closed and it was because i put my finger on the very end/bottom and could not feel any air or moisture. It might just be the air being forced into the can.

 

If the can is indeed leaking , the air will not be leaking from the can, but into the can since it is under vacuum. I doubt you would be able to feel a vacuum leak with your finger around the fittings, since it would be nearly impossible to block a leak with a finger in a area like this. That is why I suggested using starter fluid or propane to check for vacuum leaks. I forgot to check for the hissing sound this morning before I left for work, but I will try to check it later today.

dewfpo Senior Enthusiast

dewfpo

Posted
Posted

I've used propane from an un-lit propane torch (used for sweating plumbing fixtures) to check for vacuum leaks. Works great and is easy.

 

DEWFPO

sno Enthusiast

sno

Posted
Posted

It sure seems like we keep going the wrong direction as far as complexity and cost is concerned. Anyone remember the filter in the attached file? It does the same thing but only costs $1.67. :banghead:

 

 

Still, this is a pretty interesting mod. Will be interesting to see what quantities of oil everyone is getting from their filters.

post-42634-1304709459_thumb.jpg

post-42634-1304709459_thumb.jpg

post-42634-1304709459_thumb.jpg

post-42634-1304709459_thumb.jpg

BigBlueLB756 Senior Enthusiast

BigBlueLB756

Posted
Posted

Didn't air enter thru the filter medium and go through a hose down to the valve cover, so this was an intake filter, not dealing with air from the interior of the engine. Changed many of them on my old Ford truck.

cujo8 Enthusiast

cujo8

Posted
Posted
Didn't air enter thru the filter medium and go through a hose down to the valve cover, so this was an intake filter, not dealing with air from the interior of the engine. Changed many of them on my old Ford truck.

 

Yes this was a filter that clipped to the inside of the old style air cleaner setup and a hose would hook the barbed end and lead down the PCV (Positive Crankcase Valve) that slid inside of a rubber grommet on the valve cover. Actually this was the means to vent air/gases/oily vapor from inside the engine. The reason most people would change these filters was that they would get soaked with dirty oil coming out of the engine and after awhile they would begin to drip oil inside of the air cleaner, so that when you did change this filter you also had to wipe out the oil inside of the air cleaner.

 

This oily vapor is the same thing we are trying to capture using these PCV Catch Can kits in these modern engines, which we feel is a better than letting the engine try to burn this nasty stuff up. I believe this one reason for the build up deposits you find on the intake/exhaust valves and cylinder heads.

cujo8 Enthusiast

cujo8

Posted
Posted
I noticed something about my catch can tonight when I got home. My truck was idling and i walked to the front of my truck and I could hear a hissing coming from the location where I mounted my can. I popped my hood and the hissing was definitely coming from the catch can. I checked all the hoses and fittings, the top and the drain plug and there was no air leaking anywhere. I came to the conclusion that you could just hear the air going into the can since it's at the front of the truck.

 

Has anybody else noticed their catch can making a hissing noise?

 

cujo8, can you hear your can hissing a little since yours is mounted on the fender wall?

 

Mossyoakglock, I checked for the hissing sound you mentioned above when I got home from work tonight and I did hear a hissing sound from what sounded like the area where my catch can was mounted, but when I got my ear closer to the can it then sounded like it was possibly coming from further back towards the PCV connection. I was not exactly sure where the sound was coming from and I did not have time to do the leak test, since my two young grandkids (3yrs & 10months) were waiting for me to greet them on the front porch. :banghead: I will check it out tomorrow and let you know what I find. I plan to check out how much oil it has collected as well after two tanks of gas.

cujo8 Enthusiast

cujo8

Posted
Posted
I noticed something about my catch can tonight when I got home. My truck was idling and i walked to the front of my truck and I could hear a hissing coming from the location where I mounted my can. I popped my hood and the hissing was definitely coming from the catch can. I checked all the hoses and fittings, the top and the drain plug and there was no air leaking anywhere. I came to the conclusion that you could just hear the air going into the can since it's at the front of the truck.

 

Has anybody else noticed their catch can making a hissing noise?

 

cujo8, can you hear your can hissing a little since yours is mounted on the fender wall?

 

Well I finally got a chance to track down the hissing noise I heard in my truck and it was indeed a leak where I had attached the 3/8" hose to the PCV connection at the rear of DS valve cover location. Turns out that the tube that sticks up out of the PCV is really too skinny to seal properly with the 3/8" rubber hose that came with the kit. The skinny metal tube does have a raised ring near the bottom that the original PCV tube connected to, so if you could get the 3/8" rubber tube to slide over that ring that may be able to seal better, but I was unable to make this work. What I decided to do was to reuse the original hose that I had cutoff and removed and reinstall it so it points to right and hooked it to the 3/8" rubber hose that I now cut shorter to accomodate the new connection location. With this new hookup the hissing noise is now gone. :thumbs: Below is a link to a photo of my new PCV hose connection:

 

2601568300052948230avWpCP_th.jpg

DaveH71 Enthusiast

DaveH71

Posted
  • Author
Posted

Strange i never had the leak problem and i used the hose that came with the kit. I did put one of the included hose clamps on the valve cover pcv port though, haven't had a single leak yet.

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