Farmall Cub

Went out to start the pack this afternoon as the temp was over the freezing mark for the first time in a week. We had -40 wind chill for two days last week and I just could not help myself when it warmed up. I had to hear those tractors purr. First came the 1939 A. She did not fire as I wrung the last bit of juice out of the battery. Lo and behold I was pushing the choke the wrong way.(Bad case of CRS lately). No sweat just leave the key on and hand crank her over. Fired right up so I moved over to lucky my 48 Cub. Fired up on the first turn and purrred like a kitten for about a minute. Oil pressure came up nice. Then she started to miss. Not like a Johny popper but bad enough. Pulled the choke out and she smoothed out until black smoke started to come out the stack. Push the choke in and she ran fine for a few seconds and started to miss again. Shut her down. I think the float is stuck in the carb. and I can't remember if I drained the carb the last time I ran her in December. Not taking the time to shut her down the rite way will haunt you every time. I'll tackle the carb tomorrow as the weather should still be above 32. I'd rather work on the Cub than clean the snow off the roof of the house.

Before doing anything else, remove the meter jet and run a soft copper wire throug it an shoot a little carb cleaner through it. You may just have a bit of crud stuck in it. That can cause your symptoms.

Barnyard wrote:Before doing anything else, remove the meter jet and run a soft copper wire throug it an shoot a little carb cleaner through it. You may just have a bit of crud stuck in it. That can cause your symptoms.

Check that there is gas in the tank first. I agree it is most likely the jet but you don't have to shut anything off or get any wrenches out, just remove the cap.

Yeah, winter has hit here with a vengeance too. It is currently 66º in the bright sunshine!

Don't clear the snow off the roof. If the temps are below freezing the snow helps to keep heat in and cold out check all pipework is well insulated in the attic space,
Regards,
Bernard,
Donegal Cub

Donegal Cub wrote:Don't clear the snow off the roof. If the temps are below freezing the snow helps to keep heat in and cold out check all pipework is well insulated in the attic space,
Regards,
Bernard,
Donegal Cub

Snow is a great insulator...good point!

panda wrote:Went out to start the pack this afternoon as the temp was over the freezing mark for the first time in a week. We had -40 wind chill for two days last week and I just could not help myself when it warmed up

Possibly caused by some moisture in the fuel that solidified possibly plugging the jet Also moisture may have accumulated in the cap as well which might cause missing. Just a thought.

You sure the tractor just isn't out of gas?

I've had that happen more times than I care to admit. They look like they've got plenty but they'll fool you.

First of all thanks for all the help. I checked the tank and found 6" of gas inside so no problem their. Next I took the jet out of the carb and cleaned it but found no trace of junk inside. Opened the gas line and let the gas flow through the carb. Seamed like a good stream. Took the line off the carb and turned the tank on again to see if their was a blockage in the line some where. Full stream of fuel out of the line. Hooked everything up and tried to start it up and all I got was a few good turns and it shut down on its own. As I tried to start it again I noticed the amp gauge was not bouncing as the motor turned over and could not hear any sign of a cylinder firing. This has been converted from Mag Ing. to Coil. Tomorrow I will start with the electrical end and hope to find the problem. I have had bad luck as of late with the Ing. switches I find at the local parts store and maybe that is my gremlin

As for the snow on the roof. Up here in snow country when you see 2+feet on the roof and it's warm out side you clean it off if you can. After 40+ years of dealing with" heavy water" sitting on the roof you just know that if you don't take it off when you can you'll be up on top in a Blizzard removing the weight so your doors will open again. Hard to believe the roof was clean just two weeks ago. They don't call this area "Big Snow Country" for nothing!

panda wrote:I have had bad luck as of late with the Ing. switches I find at the local parts store and maybe that is my gremlin

An easy way to determine whether it is the ignition switch would be to run a jumper from where the battery cable attaches to the starter switch to the coil. If she starts, then the ignition switch is your problem.