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Harry Ferguson Tractors Discussion Forum
Show Parts for Model:

Carburator Adjustment TO35

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Shane Tharp

02-08-2018 06:35:48




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Hi Everyone Havent been on here in a while so I hope everyone is well. I just moved from WV with an elevation of 2000 feet to NM at 7300 feet. My plugs on my TO35 just started fouling out because of the elevation change. How do I adjust the carburator for the elevation change. I own a 1957 Ferguson TO35 with a 4 cylinder continental engine. Many thanks to all.




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miner09

02-08-2018 13:17:08




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 Re: Carburator Adjustment TO35 in reply to Shane Tharp, 02-08-2018 06:35:48  
I'm in Texas and when we hunted in Utah on our 4 wheeler we had to change jets in carburetor. High Altitude jet and we replaced old jet after we got home.Don't know if your tractor will be same.



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steve19438

02-08-2018 10:35:42




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 Re: Carburator Adjustment TO35 in reply to Shane Tharp, 02-08-2018 06:35:48  
which carb.?



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Steve@Advance

02-08-2018 08:26:52




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 Re: Carburator Adjustment TO35 in reply to Shane Tharp, 02-08-2018 06:35:48  
First, be sure the air cleaner is properly serviced, free of caked dirt in the wire mesh.

Be sure the thermostat is in place and the engine is coming up to temp.

Be sure the ignition system is in order, distributor good, advance working, points set. If the plugs are fouled, they may need replacing or cleaning.

Have the valves been adjusted lately?

Is the oil clean and gas free?

Now you can adjust the carb, providing it is in good order, not flooding or clogged with gas deposits, and the gas is fresh.

With the engine up to temp, choke open, air cleaner attached, engine idled down to 400-500 RPM:

Do the idle first. The idle screw is the one up top, just below the mount flange. Turn it out slightly, (which leans the mix), until the engine falters, then slowly back in to best idle, then just slightly more in.

Then set the main. That is the larger screw down lower. Set the engine at full governed speed. Locate the governor link, in front of the carb. Pull the governor back to idle and release. The throttle should instantly spring wide open and the engine rapidly come back up to speed.

Now, turn the main in about 1/4 turn, repeat the test. Keep doing this until the engine begins to hesitate when it is coming up to speed. Then back the main out until the engine will take throttle without hesitation. A single puff of black smoke is desirable.

At that altitude, you will find it needs less choke to start. There will also be some power loss, no matter how well everything is adjusted.

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Tom h.

02-08-2018 08:10:59




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 Re: Carburator Adjustment TO35 in reply to Shane Tharp, 02-08-2018 06:35:48  
With the altitude change and less dense air you will need to lean out the carburetor by opening the idle mixture screw and also the power screw/knob. At sea level this would add more air to the mixture and lean it out, but, as you are running at higher altitude now and have by default made the mixture richer by reducing the amount of air available, you need to provide more air.

Start with 1/4 turn increments until she runs good. Maybe clean or replace you plugs first.

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