Tsx-33 Schreabel help

nicko-31

Member
I have as of late experiencing some odd issues my 8-N carburetor. When not started daily the carburetor fluids but the plugs stay dry. I've rebuilt it without any positive results., Positive input would be appreciated.
 
(quoted from post at 18:45:35 11/09/19) I have as of late experiencing some odd issues my 8-N carburetor. When not started daily the carburetor FLOODS but the plugs stay dry. I've rebuilt it without any positive results., Positive input would be appreciated.

Marvel Schebler

Needle seat not tight enough?

No gasket under the seat?

Float level set too high?

Until you sort it out, shut off your fuel valve at the tank sediment bowl when tractor not in use.
 
So you go to start it up and discover the carb bowl is flooded with gas? If so, that would sound like the needle is staying open for some reason and is
letting fuel keep flowing into the bowl. I?d recheck the needle, seat, and float and see if anybody is binding up, maladjusted, or leaking.

Personally, I always shut the fuel off at the sediment bowl, to avoid exactly that issue since I seem to have terrible luck with needles and seats. My
tractor came with a leaky needle and seat that liked to fill the bowl randomly, then when I cleaned/lightly rebuilt my carb the silly new Viton tipped
needle meant to stop leaks kept sticking to the seat and refusing to meter out any fuel at startup.
 

Interesting Mr. Tomato

I just put another Rochester B air horn on my carb, and even though the first kit I had put in was still O.K. So anyway, I discovered to my dismay that the tip was sticky in the seat, and I had to tap the air horn to make it fall. I liked the old all brass ones.

But in my case I'm trusting that pump pressure is enough to keep pushing my needle off its seat.

This last needle and seat has been fine for two weeks.

Another factor is at what angle the little lifting tang contacts the end of the needle.

I just remembered . . . this makes a good case for a good gasoline additive that may have some needle tip lubrication value.

So . . . those little black tips are OK If pushed by fuel pressure
but not so much your gravity feed.

That said, just to prove I, Manuel know nothing
my Jubilee has been running fine since I put the YT kit in it
three years ago. Same type needle tip.

With fingers spin the vitrol tip in a little V of 600 paper, but just enough to take the sitckier sheen off of it.
Actually, I think I did that on my van because the stickiness of a new needle was disconcerting.

Pardon me while I ramble . . .
But perhaps it is the hole in the seat, who's edges hang onto the softer needle tip. In which case, put some 600 around a knitting needle or something so that you have a tiny cone. Give that a few laps like lapping a valve.

I never did look closely under my magnifying desk lamp at
where the needle rests on the seat.

I hope that once the needle gets used to how it is being lifted up into the seat by the floats, it will have lost any stickiness it had. I didn't want to mess with my float arms cause I had them perfectly parallel, so i lifted the little adjust tab with a screwdriver to set my float level . . . even though the GM carb kit said to bend the float arms.

But i don't think, or at least I hope, that the angle the tang meets the needle and where it ends up when closed are fine.

The Rochester on my van now is a "Post '52, Rochester B.

Sorry for O.T.-T
That would be me
But Marvelous Marvel
Was akin to Rochester B :D
 
ahhhh marvels.love them.i've had three,1 on a farmall A,1 on my te20 ferg,1 on my JD mc dozer.so easy to work on-can make u pull your hair out.easy solution=turn the fuel off when not using.
 
I am in the habit of always turning "off" fuel when I shut it down. Again what would the reason for the plugs staying dry be ? Thanks
 
Don't get lead astray by the plugs staying dry, but that said what is the compression readings? Low compression would mean low suction to geet fuel up to the cylinders.
I really do not understand your original post. Are you saying that it starts good if you start it everyday? But not if you leave it set for a few days?
fuel in the inlet of the carb could mean that you are over choking it. If you are shutting the fuel off then leakage past the needle valve is not your problem.
 
I ended up an old heavier and uncoated brass needle I was able to find. I can absolutely see how the Viton makes more sense in a pressurized system
since I get better behavior if one is installed when the tank is full compared to nearly empty, due to the extra fuel weight pushing down on the needle.
 
Okay, so fuel is off when you shutdown, which means at most there is the fuel in the line, which isn?t enough to flood the carb. Probably not a needle
leak.

With fuel being shut off, I?ll second the suggestion that maybe you aren?t getting any fuel sucked up. Do you by chance have a compression reading for
all four cylinders? Also, the air intake is clear from the oil bath on down to the carb, right? Choke moving normally?
 
(quoted from post at 04:09:44 11/10/19) I am in the habit of always turning "off" fuel when I shut it down. Again what would the reason for the plugs staying dry be ? Thanks

The plugs staying dry is a very common problem so I can understand your concern.

The cause is a good running engine
firing on all 4, that doesn't burn oil, doesn't have leaky valve guides and isn't running rich . . .
and that's the last thing you want.

Next question. :shock:
 
Viton needles and seats often have a manufacturing residue on them that makes them stick. Clean the needle and seat with mineral spirits, carb cleaner, etc.
 
So the compression is very strong due to a less than 10 hour full motoerrebuild. Regarding how often I start the tractor , I only start it and use it every other week. So the procedure to start is , turn on fuel, 2 full turns out, neutral, 3/4 throttle, choke , until it fires then choke off. By then it's too late and it floods. Because of the flooding I rebuilt the carburetor whic h didn't help. When I first rebuilt it last year i didn't have any flooding issues. After i mess with itf and start it I cant turn it off restart instantly.
 

I know every cold engine starts a little differently but it just sounds like you are over choking it. In starting my 8n I hit the starter, pull out and quickly close the choke fast. It fires right up. If I keep it choked for more than a second it floods.
 

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