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1948 John Deere A rough running

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wlmccabe

06-22-2022 07:34:07




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JD A was running good but became hard to start. When I got it started it runs rough and pops very loudly through the exhaust system. I'm not sure where to start. I tried carburetor adjustments but it doesn't seem to change anything. Anyone have experience with this problem? I appreciate any help/advice that can be given.
Thanks,
WL McCabe




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Steven Allen

06-24-2022 06:23:34




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 Re: 1948 John Deere A rough running in reply to wlmccabe, 06-22-2022 07:34:07  
Quoting Removed, click Modern View to see

I'm no expert, either, but, in my experience, a bad condenser in a mag can have the same effect.



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fixerupper

06-23-2022 19:25:06




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 Re: 1948 John Deere A rough running in reply to wlmccabe, 06-22-2022 07:34:07  
Mag or battery ignition? If it has battery ignition it sure sounds like a bad condenser. I am far from an expert on mags so I dont know if a bad condenser in a mag acts the same as a bad condenser in a battery ignition. When the engine is running the condenser will short out the spark for a couple revolutions, then it will start sparking again and the built up gas fumes in the muffler goes bang. It gets your attention.

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rustred

06-23-2022 06:18:46




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 Re: 1948 John Deere A rough running in reply to wlmccabe, 06-22-2022 07:34:07  
i said to check compression, that way a person knows if its running on one cyl. or two cyl's. then go from there. you need a starting point instead of guessing. still saying if its popping or backfiring out the exhaust and running on one cyl. you have valve problems. pull a plug wire of from each side one at a time. if it keeps running on one cyl. compression would be ok. if it stops with one wire off its as i said.

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Dan in Ohio

06-23-2022 10:13:21




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 Re: 1948 John Deere A rough running in reply to rustred, 06-23-2022 06:18:46  
rustred,

Thanks for mentioning compression and not running on one cylinder. I recently tried to get my gas 70 to run as well as my 60 which is the smoothest running tractor I have. I followed the OM and tried to adjust the carb and that required getting it to run on one cylinder, no matter what I did it would not run on one cylinder. Now I know why that happened, although this tractor seems to have decent power but certainly not like my 70 diesels have.

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Mike(NEOhio)

06-23-2022 05:18:08




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 Re: 1948 John Deere A rough running in reply to wlmccabe, 06-22-2022 07:34:07  
They will backfire if the fuel mixture is too lean. Try opening the load jet a little at a time first.



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rustred

06-22-2022 18:17:38




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 Re: 1948 John Deere A rough running in reply to wlmccabe, 06-22-2022 07:34:07  
well he said popping out the exhaust pipe. that is not weak spark , it is valves and or timing. check compression first.



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ET

06-23-2022 03:23:39




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 Re: 1948 John Deere A rough running in reply to rustred, 06-22-2022 18:17:38  
Unburned fuel from lack of ignition passes into the hot exaust manifold and ignites there causes the popping out the exaust.



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ET

06-22-2022 15:46:55




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 Re: 1948 John Deere A rough running in reply to wlmccabe, 06-22-2022 07:34:07  
Did you try a fresh set of spark plugs



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David from Kansas

06-22-2022 12:41:33




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 Re: 1948 John Deere A rough running in reply to wlmccabe, 06-22-2022 07:34:07  
Had a '51 AR do that a few years ago. Tried everything. Finally started changing condensers in distributer and finally started and run like it should. Has been OK since. Does your A have a distributer? If so, that is where I would start.



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Bob Harvey

06-22-2022 15:00:26




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 Re: 1948 John Deere A rough running in reply to David from Kansas, 06-22-2022 12:41:33  
I agree. Most likely distributor problem (if it has one). Another common problem is corrosion in the cap and rotor. Luck !



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Dan in Ohio

06-22-2022 10:05:27




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 Re: 1948 John Deere A rough running in reply to wlmccabe, 06-22-2022 07:34:07  
WL,
Leave your carb alone unless you have the needed drill bits and experience to do the job correctly, you may cause more problems and expense, just a soak job is not a cleaning for your carb. A year or so ago my 60 (best running most reliable tractor I have) started acting like it was running out of gas. Upon adding more gas if it would start it would cough, snort and pop like it still had a fuel related problem.

Long story short and many frustrating hours later I found the condenser had failed. At less than $12 each I now keep two Blue Streak DR60 condensers from Oreilley's on hand.

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rustred

06-22-2022 08:24:17




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 Re: 1948 John Deere A rough running in reply to wlmccabe, 06-22-2022 07:34:07  
check your compression and valve lash settings also. can be a burnt valve. a carburator will not cause a popping.



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greenmech

06-22-2022 07:52:28




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 Re: 1948 John Deere A rough running in reply to wlmccabe, 06-22-2022 07:34:07  
I would start by cleaning the carb real good. Ron MN



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