Well I removed the check valve behind the clutch and tested it for operation. Used a hand vacuum pump to check it. As far as I could tell it is working fine. Put it back in, put the clutch back on and hand tightened it as I read somewhere and left the chain and bar off. I wanted to see oil coming out! Started the engine the engine, let it idle a bit, then reved it up a few times and the clutch departed the engine and parts went flying everywhere. This was a bad idea. Leave the clutch off! I did manage to find all the parts, had fun getting the center piece back into place as the spring wanted to keep the weights together.
I know this is an old thread but I'm having this same problem and I'm really curious to see this fix but the link no longer works apparently. Can anyone help
Thank u. Do u know about these saws? Im trying to understand how this system works and I seem to be misunderstanding or maybe my brain is just not advanced enough to comprehend lol but I took the entire saw apart trying to find the problem and understand how it works and I accomplished neither haha. So far this is where I'm at. There is a port with a screen over it in the bottom of the crank case. That had some debris built up on it I blew it out. There is that one way valve that screws into the side of the saw it seems to be functioning properly I can pull air thru it but not push air back thru (or maybe it was the other way around but it only goes one way). Then there's the sponge thing that soaks up the oil and that's another one way that's also working properly and I put a new line going to the oiler hole. Put it back together still doesn't work. I'm not certain cuz it's not like freight train smoking like a pl55a I had that was sucking bar oil into the cylinder, but it does seem to be smoking a lot and it's not oiling at all so I believe it is probably getting at least a little bit of bar oil in the cylinder. But what I can't understand is if that one way is screwed into the saw and the other end is just sitting inside the bar oil resivoir, how could that possibly keep the bar oil out of the cylinder? I wish I would have inspected it better while I had it apart but I saw the junk built up on the screen and thought aha! Finally found the problem! Put it back together and nope. But that screen in the crankcase that's just a screen right? There's no mechanism there? What else could possibly keep the oil tank from being pressurized?
