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1939 Farmall A hanging up while cranking


 
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mbrady.glide
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PostPosted: Thu Apr 20, 2017 1:32 pm    Post subject: 1939 Farmall A hanging up while cranking Reply to specific post Reply with quote

I am trying to resurrect in 1939 Farmall A, but when I hand crank it over the engine hangs up. I can get it freed up by pulling it in fourth gear backwards. It has cranked several revolutions past where it hangs up a few times but continues to catch. Any ideas as to what might be catching in the motor? Could it be the timing gears? Its strictly a hand cranking job as it has no starter or any other electrical components beside the magneto.

This was one of those "Oh it ought to fire right up with some fresh gas" kind of deals from the guy selling it. It allegedly ran when parked. But whatever trouble it is is worth it: it was the first tractor my greatgrandparents bought.
 
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Red Dave
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PostPosted: Thu Apr 20, 2017 2:17 pm    Post subject: Re: 1939 Farmall A hanging up while cranking Reply to specific post Reply with quote

It could be a lot of things, but my first thought is that there may be something on top of a piston preventing it from getting to the top?
Did you have the head off of it? Can you take the spark plugs out and shine a light in and look in the cylinders, maybe you can see something?

Is everything in the valve train free and lubricated?
Have you tried blocking the clutch down and try it without the transmission input shaft turning?

Just a few things off the top of my head.
 
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mbrady.glide
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PostPosted: Thu Apr 20, 2017 2:33 pm    Post subject: Re: 1939 Farmall A hanging up while cranking Reply to specific post Reply with quote

Valve cover is off. Have pulled all the spark plugs. There is some rust and scale that I have been vacuuming out of the cylinders. It had the exhaust valve on cylinder four stuck open and the pushrod was loose of the rocker arm. Possibly a stuck lifter? Or bad cam gear?
 
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old
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PostPosted: Thu Apr 20, 2017 3:46 pm    Post subject: Re: 1939 Farmall A hanging up while cranking Reply to specific post Reply with quote

Sounds like one of the many I buy. Ran when parked but been parked for years. On those fil the cylinders with ATF and put the plugs back in then pour as much ATF down the exhaust pipe and let it sit a week. The pull the plugs out and spin it over to clear the cylinders. I bet once you do that it will spin over nicely and maybe the valves will work better also. BTDT many many many times and the ATF will clean up the rust and free up sticking rings and sticking valves
 
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Janicholson
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PostPosted: Thu Apr 20, 2017 5:32 pm    Post subject: Re: 1939 Farmall A hanging up while cranking Reply to specific post Reply with quote

And quite possibly blow the rust out of the spark plug hole. Good idea. Jim
 
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khouse6
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PostPosted: Thu Apr 20, 2017 6:24 pm    Post subject: Re: 1939 Farmall A hanging up while cranking Reply to specific post Reply with quote

had a cub, that started becoming hard to turn and then quit turning, at a point. i had added coolant and # 2 cylinder was leaking and cylinder walls were rusting.
 
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old
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PostPosted: Thu Apr 20, 2017 6:43 pm    Post subject: Re: 1939 Farmall A hanging up while cranking Reply to specific post Reply with quote

Done a good many and some where locked up and out of over 30 only 1 or 2 did not free up and go back to work with out a lot of other work
 
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John M
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PostPosted: Fri Apr 21, 2017 3:32 am    Post subject: Re: 1939 Farmall A hanging up while cranking Reply to specific post Reply with quote

Probably catching on the rust on the sides of the sleeves. IF you can get it run, its most likely going to smoke, since there are, more than likely, pits in the sleeve walls.
 
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MJ in the UK
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PostPosted: Fri Apr 21, 2017 7:18 am    Post subject: Re: 1939 Farmall A hanging up while cranking Reply to specific post Reply with quote

Had the same thing happen over 40yrs ago. Take the gearbox top off to see if the pin wich holds the reverse gear in place has worked loose and is jamming the gears. MJ
 
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mbrady.glide
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PostPosted: Fri Apr 21, 2017 7:39 am    Post subject: Re: 1939 Farmall A hanging up while cranking Reply to specific post Reply with quote

It still hangs up even with the clutch depressed, which would preclude a transmission issue.
 
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mbrady.glide
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PostPosted: Fri Apr 21, 2017 7:44 am    Post subject: Re: 1939 Farmall A hanging up while cranking Reply to specific post Reply with quote

The engine turned over freely when I started working on it. Oil was dirty, but no water showing in it. I hand cranked it over several dozen times before it hung up. At either place it hangs up one cylinder is at approximately TDC.
 
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john *.?-!.* cub owner
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PostPosted: Fri Apr 21, 2017 8:46 am    Post subject: Re: 1939 Farmall A hanging up while cranking Reply to specific post Reply with quote

Remove the mag and see if it turns over without binding.
 
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PostPosted: Fri Apr 21, 2017 9:32 am    Post subject: Re: 1939 Farmall A hanging up while cranking Reply to specific post Reply with quote

If it has sat for a long time as in maybe years with out being turned over as your messing with it now things tend to free up so you may have rings that where sticking but now free and catching on any rust in the cylinders and causing the problem you have. That is why i say fill the cylinder with ATF and pour it down the exhaust so the rust gets dissolved
 
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