1949 A oil at carb intake gasket, backfiring

pmarkel

Member
Bought a 49 A recently to do some chores at our farm. It ran OK when I looked at it but the owner said he hadn't run it more than a few times a year and when he had it on the grain auger it shut itself off after maybe 10 or fifteen minutes. The battery he had was weak but we jumped it and I attempted to drive it home. After maybe 10 minutes it started running real choppy, backfiring and puffing black, then stalled. I towed it home and noticed oil dripping out the gasket between the intake and carburetor. I figure I am going to change the mag cap, points, condenser and rotor as they all look to have been neglected. Drain the old gas, put new plugs and wires in and change the engine and oil bath oil. Anything else I should do before putting her back to work? And what causes oil to be pulled into the carb from the oil bath aside from incorrect weight?
 
"[b:654c4848f0][i:654c4848f0]what causes oil to be pulled into the carb from the oil bath[/i:654c4848f0][/b:654c4848f0]"

You might consider removing the oil cup from the bottom of the air cleaner.

Start the tractor and let it run for 10 minutes.

If the tractor does has not "[i:654c4848f0]started running real choppy, backfiring and puffing black, then stalled[/i:654c4848f0]", then the air cleaner may be extremely dirty or the air stack is clogged.

Dirt/mud daubers are the likely culprits in clogging an air stack.

An eco-friendly, organic, natural fiber, universal filter (old work sock) will deter the dirt/mud daubers.

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Hope this helps.
 
I would suspect a bad float causing your choppy running, backfiring, ect. The excess fuel could be leaking out of your carb causing what you think is oil.
 
(quoted from post at 17:11:00 09/16/18) I would suspect a bad float causing your choppy running, backfiring, ect. The excess fuel could be leaking out of your carb causing what you think is oil.
the previous owner did mention that if he didn't shut the gas off the carb would sometimes flood by the next time. I thought maybe worn needle/seat but I can certainly check the float...
 

You did say it had a mag, right?
If distributor, I was going to suggest a bad coil. Those will work fine cold, but quit working as they get warmed up.
 
I am rooting for that to be the cause but I guess it would be prudent to clean the oil bath cannister regardless and check the carb out. I hate to make too big of a project out of a tune up but at 70 years old ( give or take) how many short cuts do I want to tak...
 
Like James Howell said way down below, mud daubers plugging up the air stack causing it to suck oil in and then all &ell breaks loose as plugs foul and it goes down hill from there. Now if that "oil" is really just black "gasoline" (smell it) then you may as well re-build the carb. Not a "kit" but complete re-build with the 3 drill bits to drill out all passages and bushing driver to install new throttle shaft bushings and heat to get the tiny brass drill plugs out to even access the passages. Probably new throttle shaft and blade and needle/seat assy. and maybe even float if it's sinking from being punctured. Might be better to send it out. Lot to them. Start with the simple things first tho.
 

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