1975 Datsun 620 PCV valve

I have recently installed the pcv valve on my 1975 Datsun 620 truck, and I can say I was a bit confused. I thought the pcv valve (for some reason) was located right on top of the valve cover of my engine (L20B). I tried to remove it and found out it was an empty tube. I was shocked. I did a little bit of research online and found out that this thing is located below the carburator. Please take a look at the picture below. It is pointing to the PCV valve which has a rubber hose attached to it fastened with a clamp. It is hidden.

I removed the hose and exposed the valve. You can see me turning the PCV valve with a wrench here:

I bought it at Autozone, and the part number is PCV1142

How to change the Breather filter on a 1975 Datsun 620

This post is about how I changed the Breather filter on my Datsun. If you have any questions please let me know. This is also the first thing I've documented on my truck.


I replaced the filter or sponge that captures the oil that leaves the valve cover going into the air filter tray. I bought it at Autozone and had to cut a small piece so it would fit:

 The part number on it is BF1209DL.
Here you can see the old sponge filter full of old oil. Also, you can see the leftover piece of sponge, and the new one installed. The new sponge is more fat, so I had to stuff it in the small compartment gently using my scissors.

I originally made the mistake of calling the metal tube coming out of the valve cover a "PCV valve". Please note that this is incorrect. It is the "Breather Tube". I have read that you can just attach a small filter at the end to fix it if you ever brake it. Please read this on the Ratsun forums:
http://community.ratsun.net/topic/43794-help-with-an-l20b-breather-question/