Also known as “Double pumper carburetor”
For the last 24 years, I have forgotten to replace this part on my Lil’ ’66 Chevy. I still forgot to put it on my list by the looks of it, it is due NOW.
I guess that phrase is right, a picture tells a thousand words. This poor thing I didn’t know it would be such a pain to find this PCV valve. It’s a special order part and, WOW, I had to pull out my OTHER wallet to pay for it. Lol. But anyway getting back to my work, I brought out my 9/16th’s open end wrench and my channel lock pliers and some carburetor cleaner to clean things up a little (as my pictures show) he was a little dirty on the base of the carburetor too.
Before disconnecting PCV valve, I noticed cracking in the PCV hose with just visual inspection and so I grabbed it to see if there was any flexibility and my line ripped as I was pulling on it gently. So I went in with my pocket knife and cut back where the break happened being sure I have enough line to reach the new PCV valve before cutting. I made my cut and proceeded removing the old PCV valve. I will be replacing that hose the next time I’m at the parts store. As you can see from my pictures this line and old PCV has been in there for quite sometime. Now onto replacing it with my new one, my pictures show my old valve went in cross threaded so I had to get my brass fitting off the carburetor to re-tap the threads. So I take the brass fitting off the back of my carburetor and go to my bench vice and find the exact tap to re-tap its threads.
I pull out my cutting fluid once my brass fitting is in my vice and I have my tap, cutting oil, I am ready to proceed. You get your tap and your brass fitting and count the threads, being sure they are correct. Once they are correct to get your tap started on the first cut of threads and get your cutting oil out and soaking the threads on the tap on all four sides, start turning the tap slowly into the fitting. Turn a quarter turn at a time, when you do that, come out and then go back in again with the cutting oil to ensure a proper cut of the tap cutting into the brass. It will give you a proper thread. Once you reach the full depth of the fitting bring the tap out slowly, then spray the fitting out with WD -40 or any spray lubricant you may have on hand. Spray thoroughly cleaning it of any debris then take a close look at your threads checking your work then test it with what you carved the threads for. In my case, it was my valve ( I tried it with my old valve). Now that everything looks good I go out to my truck to install it, I grabbed some Teflon tape, for the PCV valve. Then I commence to connecting my valve to my existing hose and finally, VOILA! We are finished!