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Allis Chalmers Discussion Forum
:

WD runs rough

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U 1948

04-06-2008 10:49:57




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My WD runs really rough unless I pull the choke out 95%. I replaced the plugs, made sure the fuel line is clear and checked the filter on the settling bulb for dirt. I has a Marvel Schebler Carburetor on it. Ground is drying out and need to get her going. Any help is appreciated.

Thanks.

Dave




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U 1948

05-17-2008 16:46:07




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 Re: WD runs rough in reply to U 1948, 04-06-2008 10:49:57  
Finally got my WD running and she runs like a top. A very good friend of mine stopped and suggested I should try and change the manifold gaskets. It was the manifold gaskets, once replaced she ran like the tractor I grew up with. Through it all the fuel system is cleaned and various bolts etc. were tightened. The manifold is snugged up but I wonder if anyone here knows how many pounds of torque is need for the brass nuts that hold it on?

I had to give it a try and dug out my old 4 section harrow and dragged it across the garden, tough pull but in 2nd. gear she didn't have any trouble, just wouldn't want to try it for very long a lot of lugging.

Here are a couple of picture I wish they were better, I must have Digital Camera serial #1.

Thank you to all here and my friend Greg for his encouragement.

third party image

third party image

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Tinker-by-day

04-12-2008 00:39:04




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 Re: WD runs rough in reply to U 1948, 04-06-2008 10:49:57  
If none of the other suggestions work, put an electric fuel pump in the line and push the fuel into the carb.

One suggestion I did not see is to check the metering jet to make sure it has not been replaced with one that is too small...



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Rock_Picker(MO)

04-07-2008 04:56:12




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 Re: WD runs rough in reply to U 1948, 04-06-2008 10:49:57  
If the fuel system checks out OK, replace the condenser -- my WD had similar symptoms. After checking, rechecking, etc. the fuel system to death, I changed the points and condenser (out of desperation) and it ran fine after that. Good Luck................RP



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fence row

04-06-2008 20:10:29




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 Re: WD runs rough in reply to U 1948, 04-06-2008 10:49:57  
could be dirt or water in the carb, i have a tractor just that and cleaned the carb out ant replaced the gaskets, and adjusted the carb and now runs good..



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garytomaszewski

04-06-2008 17:22:41




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 Re: WD runs rough in reply to U 1948, 04-06-2008 10:49:57  
Any time the tractor runs better with the choke on there is a lean condition, either not enough fuel to carb(plugged filter/screen, vent on cap, plugged line, sticking float needle. clogged jets),OR a vacuum leak(carb to manifold, manifold to head). Possibly but not usual if machine works when choked is a stuck valve.



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Deranged

04-06-2008 15:50:23




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 Re: WD runs rough in reply to U 1948, 04-06-2008 10:49:57  
Also try taking off the gas cap. The cap may not be vented and causing the issue.



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tractormiallis

04-06-2008 15:38:57




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 Re: WD runs rough in reply to U 1948, 04-06-2008 10:49:57  
I had a WD45 running rough too and I had the same issues as you do with the choke. I played with carb a little first, and still had the problem. First, take the carb apart and blow out the main jet and all other passages with carb cleaer and an air compressor. Also blow out fuel line to the carb. I think that should do it. If you have rust or crud in the tank, stick a small tube in the top opening of the sediment bulb so it doesnt suck crud off the bottom and keeps it out of the bulb and out of the lines/carb. I did that, and mine runs great again.

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Jerry Coulter

04-06-2008 15:04:51




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 Re: WD runs rough in reply to U 1948, 04-06-2008 10:49:57  
While running, spray starting fluid around the intake manifold gaskets to ensure none are leaking. If you have been using E-10 fuel, you may have ruined gaskets in the carburetor.



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Daniell68

04-06-2008 13:33:06




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 Re: WD runs rough in reply to U 1948, 04-06-2008 10:49:57  
It sounds like a possible dirt in the carb, but I have had Ignition points cause similar problems. Another posible cause could be a sticking valve changeing the mixture for the other cyclinders.



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old

04-06-2008 11:59:40




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 Re: WD runs rough in reply to U 1948, 04-06-2008 10:49:57  
Pull the drain plug out of the bottom of the carb. Then turn on the gas and make sure you have a good steady flow of gas for 5 plus minutes. Catch the gas and then look at it to make sure its not full of rust etc. Also pull the main jet adjustment screw out and make sure you have a good steady flow of gas out of it. You can also spray carb cleaner into the main jet with the drain plug out to help clean it out. Sounds like the main jet is clogged up

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