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300 Farmall overfueling

3

300jk

Well-known Member
Just got done cleaning the driveway with the 300 Farmall and blower. While blowing snow it was working it's guts out. Hard packed drifts. While working the muffler turned cherry red and had blue flames coming out the top about 2 inches. Has never done this before. Fuel screw set max setting as per manual. Tractor ran perfect. Am I throwing that much gas to it that it is still burning it through the exhaust ? Less than 10 here now and wondering if the cold might have something messed up in the carb ? I posted previously about having gas in the oil, and since have been shutting the gas off which seems to have taken care of that issue. Thoughts ?
 
I haven't messed with the timing in years. Possibility though if I have another problem, but started and ran great.
 
Advance In the distributor could be messed up/locked up and can cause that and that is not good since it can/will cause burned valves which then mean you have to pull the head and do a valve job. Or it is running way to lean which will also cause it to over heat the exhaust and in turn also hurt the engine
 
Had an engine with retarded timing, it ran the muffler cherry red... and the muffler eventually swelled. Found out the timing was set at 6% when at full advance. So it was about 15 degrees retarded at idle.
 
Thanks old ! Oh the winter fun ! Hope I didn't do something bad by running it that way. Like I said it ran perfect and when not under heavy load it wasn't as hot. Temp and everything was normal.
 
The cold air is working like an intercooler. Cold air can burn more fuel and thus you now have a lean mixture.
Remember back when you worked tractors from day time into the evenings, and the tractor always had more power and ran much better in the evening air.
Loren
 
Ya engine temp can be just fine but if the timing if off and running to lean it can/will eat the valves and cause the exhaust to be way to hot which is why the valves get burned
 
Ok I do get that. We have a puller we mess around with. So if I am lean when it's cold, and I already have my carb set to max fuel, what is the next step ?
 
First thing I would do is try choking it some. If that does in fact help then pull the air cleaner tube off the carb. Fire it up and as it is running place your hand over the air intake of the carb. Try to do so enough to cause a big suction but not enough to kill the engine. Doing that will sometimes clear a blocked passage way in the carbs main jet circuit. If the hand trick does not do it time to rebuild the carb or since it is cold out run it with the choke pulled part of the way till it warms up so you can rebuild it
 

Unless you are having some lack of power or overheating issues, and (as you say) the tractor has been operating properly, you have NO issues,

When you work the snot out of a gasoline powered tractor the muffler gets HOT, and there's some visible flames above the stack, especially if it's not real brite and sunny outside.

NOT sure what one of the guys that replied was thinking, but LATE ignition timing causes a HOTTER exhaust and less power and more flames, EARLY ignition timing causes "knock" and piston destruction, bit NOT a hot muffler and more flames, IMHO!
 
My old gas Masseys would do the same thing. Not unusual to see 6 inches of fire out of a red hot muffler when plowing, then they would subside on the headlands. Always ran like that, never hurt anything. Yours may be OK if all else is normal.Handy to light your smokes if the cigarette lighter does not work,lol!
Ben
 
your next step would be to check the point dwell or setting, and timing. you always set the points first , then set timing and carb adjustment is last. an engine with retarded timing will make the engine run hot under load. best to use a timing light in this case and check if advance is working also. would not hurt to even set the valves if they have not been set for couple years , plus depends on your working hrs. of course. you want the valves seated as long as possible to dissipate the heat from the valve face. factory specifications are for a reason.
 
plowing or disking at night under a heavy load Dad's old Allis would start to glow red at the base of the muffler. Then the red would expand up the muffler, flame out of the pipe all the time. My John Deere D will show about 6" of flame out of the exhaust pipe under the same conditions. Just normal gas tractor operation under a heavy load.
 
A little blue flame out the muffler of a Farmall is exactly right when worked hard. You can only see it in dim light. I would imagine the red muffler was not daylight bright red but dim light dull red. If so, I don't see a problem.

You only get the blue flame when everything is set right and it is working hard.

When you're working it hard in the daylight you can set the power needle to show just a bit of soot in the exhaust. Of course you can't see that at night. A Farmall needs to be adjusted to the load if you're working it hard.
 
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