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Harry Ferguson Tractors Discussion Forum
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TO-20 Stammering at high idle.

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Mose

10-30-2005 12:30:04




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Help if you can I recently received an old 1953 TO-20 from my grandfather and when I try to get this tractor too idle high enough to mow with it it stammers and floods itself. I have replaced plugs,wires,cap,rotor,points and condensor. Am I missing something? I have set the carb to factory settings. The tractor will start and idle like it is new but if you put it under a load it really falls. It also has new sleeves pistons and rings in it as well. The tractor had not run for over 15 years before I received it. Any help would be appreciated.

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John (UK)

10-31-2005 10:47:23




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 Re: TO-20 Stammering at high idle. in reply to Mose, 10-30-2005 12:30:04  
If you need the info on how to overhaul your carburettor, email me at:- fergusontractors at tiscali dot co dot uk
remind me what you need and I will send it to you.



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gerard

10-31-2005 08:36:21




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 Re: TO-20 Stammering at high idle. in reply to Mose, 10-30-2005 12:30:04  
Could be a number of things. Engine's been rebuilt, so the governor linkage has been disturbed. Are you sure it's correctly set up? You say it backfires. Could be you're running on two cylinders with two crossed plug leads, you've got fuel starvation, or ignition timing is retarded.
Try simple things first, ie firing order first, then timing, fuel flow then governor.



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gshadel

10-31-2005 05:28:22




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 Re: TO-20 Stammering at high idle. in reply to Mose, 10-30-2005 12:30:04  
Do what these guys below suggest, it is sound advise. Point gap is critical to get good spark. Fuel flow can be restricted from 15 years of varnishing-up. From your initial description, sounds like a likely ignition problem. Pull a spark plug, connect it to ground and run your engine, look at your spark. You should get a nice blue zappy spark, not a weak orange spark. If your spark is weak, make sure all your electrical connections to the coil and distributor are shiny clean. Corrosion is a killer on 6V systems. Once your sure you have a good spark, if you still have trouble, I'd probably pull the carb, take it apart and clean it out. Sitting 15 years can be hard on a carb. A rebuild kit is ~$20, it is an easy job.

If that still doesn't clean-up your run problem, check your compression in each cylinder, might have a sticking valve. Might just need to pull the valve cover and squirt down your valve guides, etc. with penetrating oil, Marvel, etc. to de-gunk them if they are dried out.

George

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mose

10-31-2005 06:45:34




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 Re: TO-20 Stammering at high idle. in reply to gshadel, 10-31-2005 05:28:22  
I cleaned and coated the fuel tank replaced the points condenser car and rotor plugs, when I checked the spark it looked good.
This tractor has allready been switched over to a 12 volt system kind of a hack job but seems to work someday soon I would like to redo the system back to a 6 volt system. Thank You Andrew



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danct

10-30-2005 17:54:45




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 Re: TO-20 Stammering at high idle. in reply to Mose, 10-30-2005 12:30:04  
mose when you got the tractor if it sat for a long time did you drain all the old gas out,,when you changed the points did you set the gap correctly,i think it should be .022,when you changed the plugs did you gap them i think gap should be .025 ,finally check what Jerry said about fuel flow at bottom of carb,let us know,
If my settings for points and plugs are wrong please correct me any of you other readers on here
good luck Danny

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mose

10-31-2005 06:41:02




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 Re: TO-20 Stammering at high idle. in reply to danct, 10-30-2005 17:54:45  
When I started to tear down the tractor for rebuilding the engine I bought a tank cleaning and sealant kit for a motorcycle, I will double check my points gap I appreciate your comments keep it simple and check the basics. I am gonna just rebuild the carb again if you know of the settings to shhot for after a rebuild I would appreciate it the book I bought doesn't give me rebuild specs.
Thank You Andrew

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gshadel

10-31-2005 07:33:56




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 Re: TO-20 Stammering at high idle. in reply to mose, 10-31-2005 06:41:02  
Mose, float gap is 9/32", you should get instructions with a carb. rebuild kit. The kit instructions for the float gap may be different than 9/32". All the new rebuild kits come with rubber tipped needle valves instead of the original machined brass needle valves. I found that when I went with the "book" gap, the engine ran fine, but I got a lot of fuel leak-by when the engine was off, flooding the carb. I opened the carb back up and regapped the float according to the kit instructions, and it worked better. Measure the float gap ~ 1/2 way down the float, not up by the needle valve.


Just for the heck of it, doublecheck your firing order 1,3,4,2, the distributor runs counterclockwise. You would be shocked at how many guys get those things switched around. The engine will run like you describe if the wires are out of order.

George

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Jerry/MT

10-30-2005 17:15:40




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 Re: TO-20 Stammering at high idle. in reply to Mose, 10-30-2005 12:30:04  
I'm having a hard time figuring out what "...stammers... "is can you be a little more discriptive? When you say "...it... floods itself..." do you meean that there is excess fuel in the carburetor and the engine stalls out?
Are you sure that it's not starving for fuel? If that's what you mean, then get a large container, open the tank valve and then take the plug out of the bottom of the carb and let the fuel run into the container for thirty seconds. It shold come out continuously in a gush. If it starts out fast, then slows down or becomes intermitnet than start checking for a blockage beginning with the "secret filter" at the carb fuel inlet elbow and working your way back to the sediment bowl and the tank valve. You make have to pull the tank valve and drain the contents of the tank. A lot of these machine sat idle and have all manner of crap and corruption in the fuel tank.
If I have misinterpreted your problem, I apologize. Please be little more discriptive in the future.

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mose

10-31-2005 06:36:55




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 Re: TO-20 Stammering at high idle. in reply to Jerry/MT, 10-30-2005 17:15:40  
When I say stammering I mean it back fires until you reduce the fuel position by backing the throttle off,then I am running at such a low RPM that it pulls the engine down allmost to a stalling condition. I am gonna try to rebuild the carb but the book I purchased doesn"t give settings to shoot for after rebuild.
Thank You for your help.



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Jerry/MT

10-31-2005 09:03:47




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 Re: TO-20 Stammering at high idle. in reply to mose, 10-31-2005 06:36:55  
If your spark is OK (nice, fat, bluish spark, not orangey or yellowish) Check your initial timing, and make sure your spark advance mechanism is working and that you plug wires are located properly. The firing order is 1-3-4-2 and the distributor rotor turns counter clockwise, and #1 cylinder is right behind the radiator. Your carb main jet screw should be out 1-1/2 turns and the idle air screw should be out about 3/4 turn. Keep gettin back here tile this thing out.

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