Reproduction Gates PCV hose

[mopar73dge]

About two years ago I changed my worn PCV valve on my 73 318. I decided to buy that very expensive Gates date coded 11/32 inch hose. I noticed soon after driving the car, the next time I went under the hood to do some cleaning, this after a week of sitting in the garage, the hose was oily at the valve and down a few inches, I cleaned it up. It did it again and the rubber seemed to just wipe off a black film, after about 1000 miles it went to the entire length. This has never happened in the 35 years with this engine until now. I just read here in the forum someone mentioned it was the wrong material hose. You would think that purchasing the reproduction material paying all this money, it would be correct! I switched over to a regular good year made pcv hose, It does not have the lettering, but it works and does its job. I think the oil fumes and fuel vapor blow by must have reacted on the PCV line, maybe my engine leaks more than say a new one, but I decided to experiment. I have the hose off the engine all cleaned up with a degreaser, it was dry. Later a put a few drops of clean oil inside down the end and kept it up ward. The outside I wiped clean and dry. The next day the oil had came through the rubber hose, and it was clean oil! I think this would prove there is a materials problem.

Anyone have this happen on there engine?

 

[idrivemopar]

Do you know if this hose is fuel rated, as you should be using a fuel rated hose for your PCV line because they are built for low permeation and are nitrile type hose with re-enforcement braiding. If you look at the end of the hose, you should see white dots around the center of the hose wall and or you will see a cross hatch pattern on the rubber. If you don't see either, it may be vacuum hose, which is not suitable for fuel or oil, and you can get the permeation that you describe.

 

[mopar73dge]

I see what you mean no cross hatch on the repo line thank you! The repo PCV booster line is not correct use for PCV valves but why would they sell that for PCV use? or maybe I misunderstood. Its all set now I have the correct line just like I did before this issue. Thank you. Mike

 

[idrivemopar]

I don't know the answer to that, but I would check the SAE rating on it, if it is stamped with that information, and verify that is a fuel rated hose.