Spits, Sputters, Dies Under Load

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AgTires4295
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Spits, Sputters, Dies Under Load

Postby AgTires4295 » Tue Sep 04, 2018 2:07 pm

1951 Cub.

Pretty frustrated.

I've been cutting about 3 acres of grass with this Cub for a few years now and have never had electrical issues (electrical being my opinion) like I have had recently.

I initially thought it to be a coil since it gets hot and the engine sputters and dies (makes sense right?). Installed new coil. Same thing.

New condenser/points (gapped properly). Same thing.

Took apart generator (just for the heck of it) and put it back together with good cleaning (brushes still good although not putting out much charge). Same thing.

Took apart carb and cleaned (thinking it could be fuel related). Same thing.

What gremlin am I chasing???

All grounds seem fine. Connections good. I'm stumped and have a long walk home for the 4295th time.

Once it cools off, it starts again without one hiccup.
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Re: Spits, Sputters, Dies Under Load

Postby Urbish » Tue Sep 04, 2018 2:23 pm

6V or 12V? Do you have a resistor on the coil?
Jim

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AgTires4295
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Re: Spits, Sputters, Dies Under Load

Postby AgTires4295 » Tue Sep 04, 2018 2:33 pm

6v (that would have been great to publish in the initial post). I don't believe it has a resistor as the original one does not but I don't know for sure.
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Re: Spits, Sputters, Dies Under Load

Postby indy61 » Tue Sep 04, 2018 2:38 pm

As soon as it starts to sputter pull the choke, if it helps than fuel.

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Re: Spits, Sputters, Dies Under Load

Postby AgTires4295 » Tue Sep 04, 2018 4:44 pm

I'll try that but I truly believe it's something electrical. The carb was near spotless and I blew out the jet. I ensured proper fuel flow with the float, needle, etc... All good. It runs perfectly (sound like a sewing machine) when cold and fires up immediately. It's only when I've been cutting for a few minutes that it starts to sputter and dies 5-10 seconds later.

If I let it sit in the field overnight, it starts, no issues. If I try to start it after it sputters out, it just cranks and cranks and cranks. Every now and then, a cylinder will fire after it sputters out but nothing to sustain a start. If it does start after a few minutes, it's always on full throttle only.
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Re: Spits, Sputters, Dies Under Load

Postby indy61 » Tue Sep 04, 2018 4:54 pm

Sounds like a fuel issue to me. Maybe I've been lucky but I've never had an electrical problem cause those symptoms.

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Re: Spits, Sputters, Dies Under Load

Postby Glen » Tue Sep 04, 2018 5:23 pm

Hi AgTires4295,

You could look at the gas cap vent holes. The gas won't flow if the vent holes are plugged.
If it is an original style cap, there is one hole on the top, and 2 holes on the bottom side. Use a small wire, and clean them if needed.
You might have the newer, free replacement cap, from Case IH.

When it quits running, loosen the cap and see if it works then. :)

Below are pics from TM tractor of the original style cap. The vent holes on the bottom side, in the 2nd pic, are at about 2 and 8 oclock.

http://www.tmtractor.com/tm-tractor/gfl/fuelcap_001.htm
Last edited by Glen on Tue Sep 04, 2018 5:30 pm, edited 1 time in total.

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Re: Spits, Sputters, Dies Under Load

Postby AgTires4295 » Tue Sep 04, 2018 5:30 pm

Glen! Great hearing from you! I'm wondering if you're right! It could be a vapor-lock situation! It's absolutely the original fuel cap. I wouldn't doubt it having been clogged since the farm animals are always laying a layer of barn dust across it.

I'll replace with one from another Farmall just to see if that helps.

Crossing my fingers!
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AgTires4295
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Re: Spits, Sputters, Dies Under Load

Postby AgTires4295 » Tue Sep 04, 2018 6:07 pm

Well I was so excited at the thought of a mere vapor-lock situation that I ran outside, fired it up and headed to the field.

Same story only I made it about 10 minutes under load this time before it surged, sputtered at died. Luckily, it started immediately again and I'm able to keep going. The coil is generating a great spark and I've got good fuel flow (I think)...

What gives?

Thinking there may be a restriction in the fuel bowl (?). I may have to delete it to find out. I was hoping to keep it as stock as possible but this may be the first step in the other direction.

It definitely is starved for fuel now that I'm putting two and two together.
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Re: Spits, Sputters, Dies Under Load

Postby inairam » Tue Sep 04, 2018 6:14 pm

Agtires

I would also consider adjusting the valves ( because it probably needs it), the timing with a light, and the linkage between the carb and the governor and maybe the governor spring.

If the governor/ linkage is not reacting fast enough or property the carb and the electrical can be perfect but it will stumble under load.
When you only have 9 horsepower you need to know the names of all of the ponies!

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AgTires4295
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Re: Spits, Sputters, Dies Under Load

Postby AgTires4295 » Tue Sep 04, 2018 6:23 pm

I'll have to see how to adjust the valves (uncharted territory there) but I'm sure every little bit of fine-tuning helps with this little machine. As far as I know it's NEVER been done.

Great pointers
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Re: Spits, Sputters, Dies Under Load

Postby indy61 » Tue Sep 04, 2018 6:28 pm

The stock sediment bowl screen and carb inlet screen is not adequate in my opinion. I was only able to achieve good filtration after adding an inline filter and altering the sediment bowl with a screen at the fuel tank outlet.

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Re: Spits, Sputters, Dies Under Load

Postby ntrenn » Tue Sep 04, 2018 6:40 pm

Must be the weather....my 65 just started doing something similar throw the load on too fast and it sputters and dies. I was able to finish the yard but had a couple of 10 minute rests.

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Re: Spits, Sputters, Dies Under Load

Postby Glen » Tue Sep 04, 2018 7:04 pm

Hi,
The gas strainer under the gas tank needs cleaning at the hour recommendation in the owner's manual.
I would clean it, if you haven't lately.
The strainer has a fine screen in the top, above the gasket.
If the gasket is old, it might not seal again, if you try to reuse it.

Below is a page from the Cub owner's manual showing the strainer.

http://farmallcub.com/rudi_cub/www.clea ... e%2025.jpg

It is easier to get to the strainer if you move the Touch Control arms the rear position first.

Below are listings at TM Tractor, you can look at.

http://www.tmtractor.com/new/fl/426fp.htm

http://www.tmtractor.com/new/fl/235fp.htm

You could remove the small plug on the bottom of the carburetor, under where the float is, and check the gas flow. Catch it in a clean can, and you can put it back in the gas tank later.
Check the flow for about 1 minute. The flow should be steady, and not stop. At first probably a lot will come out, that is what is in the carb. :)

I've read on here that you have to be careful adding an in line filter to a Cub, some of them slow down the fuel flow too much. The filter has to be for a gravity feed fuel system, not something with a fuel pump.
Last edited by Glen on Tue Sep 04, 2018 7:55 pm, edited 1 time in total.

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Re: Spits, Sputters, Dies Under Load

Postby Shane N. » Tue Sep 04, 2018 7:12 pm

Glen wrote:I've read on here that you have to be careful adding an in line filter to a Cub, some of them slow down the fuel flow too much. The filter has to be for a gravity feed fuel system, not a car, with a fuel pump.

Glen, the in-line filters people have trouble with are for small engines with fuel pumps. Don’t want anyone getting confused if they go buy one. I know Briggs & Stratton have 2 different ones for sure.
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