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B Carb leaking


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Bryan Smith

02-11-2002 13:32:05

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OK, here goes - I bought a B a few months back that runs sweet as a sewing machine. At more than 1/2 throttle it had fuel starvation problems. OK, fuel blockage somewhere - and the carb leaks when the engine is not running.

So I replaced the sediment bowl assembly and fuel line (lots of rust flakes in the old sediment bowl inlet), rinsed out the gas tank, and replaced the carb float, needle valve, and seat. I re-used the carb body gasket since I didn't have one - had a few small internal tears but nothing to write home about.

Reassembled it and presto! no carb leaks. Cranked it up and wow! 1/2 to full throttle it ran great. Below half throttle it was waaay too rich, smoking and so forth. Well, that must be a blockage in the air mixture screw. So I removed the screw, blew in so compressed air (air came out of the oil bath breather so it went through ok) and put the screw back in. Uh oh, the carb started leaking again. Not out of the body gasket but near the choke plate rod area - into the air breather assembly.

Pulled the carb back off. Checked the float level - set at 9/32" from body per spec for a M-S carb. Removed and inspected float, needle valve, and seat - all ok. Put it back togther and on tractor. Still leaks. Tractor runs much better at low rpm but is still too rich - no smoke but has the occaisional "stutter" or "miss" from being a little too rich. It runs better/worse/better/worse - when it runs slightly worse the governor opens slightly and it runs better. Air mixture screw makes little impact.

Any ideas? Should I set the float a little lower than spec? Would a gasket with a slight tear do this? I know an out of adjustment float will allow it to leak - and may allow it to run too rich - but this one is set per spec.

Any help appreciated - I'd like to get it back to no misses at 400 rpm idle ....!

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Bryan Smith

02-12-2002 12:23:47

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 Re: B Carb leaking - ideas? in reply to Bryan Smith, 02-11-2002 13:32:05  
My B has a steel fuel line (I replaced the old steel fuel line with a new one). When you guys add an in-line filter do you convert to a rubber fuel line, or did you adapt the filter to steel? I hate to get away from the steel line, but I may have to ....!

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02-12-2002 11:23:40

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 Re: B Carb leaking - ideas? in reply to Bryan Smith, 02-11-2002 13:32:05  
I would add an inline filter. i had fits with my WD until I did that. add it between the sediment bowl and the carb. the sediment bowl just does not catch all the sediment. it does good with water however. also, when the butterfly linkage gets worn in the carb body, that will cause you fits too. most carbs kits have new bushings or seals and be sure to install those! My CA was starving under load too last summer and it has a Zenith that is not adjustable for high rpms. i set the float but it didn't help. turned out to be the timing. I set it correctly and it runs great. hope this helps.

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02-12-2002 08:28:25

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 Re: B Carb leaking - ideas? in reply to Bryan Smith, 02-11-2002 13:32:05  
It could be that the bowl vent is plugged and not letting the float to rise. the vent is ussally located on the top assembly near the throat.

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Dick L -- I forgot

02-11-2002 17:04:15

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 Re: B Carb leaking - ideas? in reply to Bryan Smith, 02-11-2002 13:32:05  
to attach a drawing of a Marvel Shebler

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02-17-2002 14:51:37

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 Re: Re: B Carb leaking - ideas? in reply to Dick L -- I forgot, 02-11-2002 17:04:15  
Dick, Where does that link take you? Those are all very interesting diagrams but where is the site, and who put them there?

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Dick L

02-11-2002 16:48:23

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 Re: B Carb leaking - ideas? in reply to Bryan Smith, 02-11-2002 13:32:05  
I would guess you are still having problems with little specks of rust flakes. They could still be coming from the tank. These little specks can get hung up in the float valve, and power jet.
As for your mixture adjusting screw, This is an adjustment for idle only. At half throttle it is out of the system and can be removed without any affect. Get the idle adjusted and forgit that screw altogather. If you have a Marvel Shebler without an adjustment screw for the power jet you could have a flake of rust on the back side of the power jet and it might have to be removed to clear it. You could have the same problem even if it does have an adjusting screw. After a dose of rust flakes I have had to disassemble and clean a carburetor several times on more than one tractor. If the gas tank has not been taken off and really cleaned it would be best to install an inline filter between the tank and carburetor.

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Bryan Smith

02-12-2002 06:30:21

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 Re: Re: B Carb leaking - ideas? in reply to Dick L, 02-11-2002 16:48:23  
Many thanks. I'm not having fuel delivery problems at all so I don't think there's any blockage on the main jet. I'll look it over some more ....

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Dick L -- Just a story

02-12-2002 07:03:31

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 Re: Re: Re: B Carb leaking - ideas? in reply to Bryan Smith, 02-12-2002 06:30:21  
Year before last I had a Fri., Sat., and Sun. pull. The C took first place on Fri. I loaded the tractors and moved to the Sat. pull site and went home. Next morning gas was running out of the carburetor. Started it up and didn't run for sour apples. Pulled the carb off and washed it out with spray carb cleaner. I put it back on and it ran fine so I headed for the scales, before I got to the scales it started to sputter starving for gas. Took it back to the truck. Took the gas line off at the carb and had full flow there. I took the sedement bowl off and drained the tank, took the carb off and washed it out with the carb cleaner again. I put every thing back togather and it ran fine. Weighed the tractor in made the adjustments and was ready to pull dirty and a grease monkey and smelled like a gas tank.
Started down the track and the little C started to sputter again.
Loaded the tractors and took them home. Stopped by an Autozone and picked up an inline filter.
Sun morning early I went out and gas was running out of the carb, I cut the fuel line and put the filter in, took the carb off and took it apart, removing the jets, washed it out with the carb cleaner. I put the carburetor back togather and run about a gallon of gas through the fuel line before hooking it back up and that was the end of the fine rust flakes getting into the carbuertor.
I took second place on Sun. Got beat by a hopped up Avery.

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Bryan Smith

02-12-2002 08:38:42

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 Re: Re: Re: Re: B Carb leaking - ideas? in reply to Dick L -- Just a story, 02-12-2002 07:03:31  
OK, now I'm curious - doesn't the sediment bowl have a strainer on it that would catch much of this normally? Or are the strainer openings too large? I'm guessing from your experiences a rust particle or flake was obstructing fuel flow and keeping the needle valve from closing. Wonder if Phil's idea about the carb vent is my problem since I haven't found obstructions yet - now to find that little air vent bugger ...!


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Dick L

02-12-2002 09:04:17

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 Re: Re: Re: Re: Re: B Carb leaking - ideas? in reply to Bryan Smith, 02-12-2002 08:38:42  
The sediment bowl does have a strainer but is not as fine as the inline filters. I think the screen in that seditment bowl was not in the greatest condition at the time. I have lots of tractors and seem to not change screens and other parts unless they are giving me a problem. What I didn't put in my story was that I never saw the particals that were causing the problem, could be because of my age and not being able to get my trifocals in a position to see them, or as I took the carb apart the gas still in the carb washed them out as I took it apart. I keep a thin wire from a price tag in the truck to run through the power jet and air from my lungs to blow out the carb when at a pull.

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bill a

02-19-2002 03:10:11

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 Re: Re: Re: Re: Re: Re: B Carb leaking - ideas? in reply to Dick L, 02-12-2002 09:04:17  
i've got 45 had same problem last fall.rebuilt carb ,installed inline filter between bowl and carb.seemed to work ;no leaks runs good .used rubber fuel line to install filter

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