I'm hoping someone can tell me what this little aluminum plunger, spring and check ball do? There's no part number for it, but it's just below and to the right of #85. My carb doesn't have the spring anymore and can't figure out what to do? Mine's a 74' cali truck. Thanks!
I do believe it is a check valve for the accelerator pump plunger. As the plunger is raised it draws gas into the bottom of the well from the float chamber. During this process, that ball and spring seal the passageway above the little nozzle in the primary bore. Then when th eplunger comes down, to deliver the squirt of gas, this ball is pushed out of the way. Probably also seals the passage way, so that engine vacuum cannot suck gas through that passage while cruising down the road.
The aluminum bit, is simply a retainer, so you can get it the spring an ball out.
Let me guess, it took a flying leap behind the bench into a great abyss of doom upon dissasembly?
It appears that the nozzle above the aluminum plunger doesn't ever actually block the nozzle. It looks like it's just something for the spring to push against? The ball appears to block a tiny hole at the bottom of the passageway and that, maybe , the spring allows fuel to get by when enough pressure is applied? Just guessing based on what I'm looking at.
My problem is, I don't know if I ever had that spring!? I fashioned a teenie little spring from a spring kit at OSH and it seemed to run a little rough with it in. Without it, it seems to run fine. I just don't like not knowing what's supposed to be going on in there.....Like I'm missing out on smoother performance or something?
Go back to the SOR catalog and look at the correct carb for your year model.....if yours is a earlier carb than the one you posted a pic of, it doesn't use a spring.... just a ball, weight & the top aluminum retainer......
Grant is right, I haven't been into a 1F carb in a long time, I'm running a 2F carb on my 40, so the spring is correct for a 2F. Look at the diagram above the one you posted at SOR. It even has a part number for the weight. As I recall that weight is just a little triangle shaped cylinder of sorts that sat on that ball. With the aluminum thing on top, retianed by a screw, or just the top of the carb I think. It just makes it so that the gas doesn't come out the top, but is forced out the accelerator squirter.
The wieght acts like the spring, for reasons I mentioned above. The spring itself is very soft in the 2F carb as I recall, very soft.
