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Farmall & IHC Tractors Discussion Forum
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Initial Carb Settings - Super C

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SuperCDon

06-28-2006 08:30:04




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I"m suffering with same problems others have described. I cannot get my Super C started after completing the re-assembly. The engine was rebuilt prior to this restoration and was running great so I did nothing to it. I removed the carburetor and had it rebuilt by Denny's (first mistake). I removed the distributor and have re-timed it with #1 plug(front of engine)firing at TDC at 2:00 on the distributor cap. I have spark. I have fuel to the carb. When I pulled the drain plug on the carb I had about 1 ounce of gas drain out. I have gas collecting in the air/choke inlet when I try to start it. I"ve run a new battery down trying to start it. The throttle is at 3/4 full open. Before going further, what are "initial" settings for the main jet adjustment and idle adjustment screws? Should I have gas collecting in the air inlet (I don"t think so)? The spark plugs are new, clean and dry. Any other suggestions?

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City-Boy McCoy

06-29-2006 03:43:13




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 Re: Initial Carb Settings - Super C in reply to SuperCDon, 06-28-2006 08:30:04  
Two more thoughts come to mind in addition to what CNKS mentioned:
1) I have never had luck with the 1 5/32 float adjustment on my zeniths - always end up reducing that measurement to about 1 1/16". Otherwise, I get gas pouring out of the thing and rich running with black smoke.
2) You mentioned the plugs were dry. Taking you at your word on that, it could mean the air/fuel mix is not getting up the manifold into the cylinders. Sometimes that happens with these old C123 engines - especially if they have been sitting. (Your engine has not been sitting, but it is new and has not been run yet.) When it happens, I squirt a little gas in each cylinder with a syringe through the spark plug holes just to get it to light off. Other guys will squirt a little oil into each cylinder. The oil improves the seal around the rings which, in turn will enhance the suction of the air/fuel mix to the cylinders.
mike

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CNKS

06-29-2006 17:30:59




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 Re: Initial Carb Settings - Super C in reply to City-Boy McCoy, 06-29-2006 03:43:13  
Mine is set at less than 1 5/32 too. No smoke, no gas problems, but it runs rich -- those tractors need to be run a lot to keep the soot buildup out of them. I think I would rather have a distillate carb with a main jet adjustment.



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SuperCDon

06-29-2006 05:34:38




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 Re: Initial Carb Settings - Super C in reply to City-Boy McCoy, 06-29-2006 03:43:13  
Thanks much for the reply. I tried squirting gas into the cylinders. No luck. My engine was rebuilt a couple of years before I bought the tractor and started restoration. It was running until the day I decided to start disassembly...about a year ago. It's been sitting ever since. Based on CNKS reply, I will make sure the jet settings are about right. I have been reluctant to open up the Zenith carb since Denny's is such a pain to deal with...I paid $175 to have the carb rebuilt..thought they were a good place because of their RP mag ads..but if I do anything to it..even though it had the choke actuator shaft on bass-ackwards...they want to charge me shop time and labor to make it right. Guess I will just bite the bullet and check the float setting myself. I held my hand over the air inlet..had great suction. Since the timing seems right, about the only thing it could be is the carb.

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City-Boy McCoy

06-30-2006 06:08:51




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 Re: Initial Carb Settings - Super C in reply to SuperCDon, 06-29-2006 05:34:38  
At the risk of getting you into something you wish you hadn't, let me encourage you to take your Zenith apart and go through it yourself. In the world of carburators, they are VERY simple devices. I bought my rebuild kit from the NAPA store for about $20. Kit was an Echlin 2-1565. Now, that was for my 1951 Super A, but they should be the same(?). Found mine had the wrong bowl gasket when I took it apart. Study them carefully - there are several in the kit. mike

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SuperCDon

06-29-2006 05:21:55




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 Re: Initial Carb Settings - Super C in reply to City-Boy McCoy, 06-29-2006 03:43:13  
Thanks much for the reply. I tried squirting gas into the cylinders. No luck. My engine was rebuilt a couple of years before I bought the tractor and started restoration. It was running until the day I decided to start disassembly...about a year ago. It's been sitting ever since. Based on CNKS reply, I will make sure the jet settings are about right. I have been reluctant to open up the Zenith carb since Denny's is such a pain to deal with...I paid $175 to have the carb rebuilt..thought they were a good place because of their RP mag ads..but if I do anything to it..even though it had the choke actuator shaft on bass-ackwards...they want to charge me shop time and labor to make it right. Guess I will just bite the bullet and check the float setting myself. I held my hand over the air inlet..had great suction. Since the timing seems right, about the only thing it could be is the carb.

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CNKS

06-28-2006 17:54:36




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 Re: Initial Carb Settings - Super C in reply to SuperCDon, 06-28-2006 08:30:04  
The A,B,C,SA,SC had more than one brand of carb. Usually the settings are 1-2 turns for the idle and 1-1.5 turns for the main. Zenith is 1 for idle and 1.5 for main - this is for a C, I assume Super C is the same. If it has a Carter carb the specs are probably about the same, but I don't have one of those. BUT, there is no main jet adjustment screw unless you have a Kerosene/distillate carb, a little unusual for a Super C, but I think IH used them until the late 50's, likely mostly for export -- but you could have one. In warm weather your tractor should start without a choke, then open it slightly to keep it running. Carbs used on IH tractors are notorious for flooding, and if they don't start right away they will flood, then as you have found they are nearly impossible to start. I don't have any other suggestions except that the float needle may not be seated properly, and your float may not be adjusted right. For the Zenith, the correct setting is 1 5/32 from the bowl/throttle body gasket to the bottom (top) of the float, measured with the throttle body UPSIDE DOWN. The float should be horizontal with this measurement. Having said all this, I think your problem is a badly leaking carb, requiring disassembly, and inspection. I have never heard anything good about Denny's. Your timing sounds ok. But, when you reinstall it with the marks lined up, it is a good idea to rotate it counter clocwise viewed from the rear, the rotate it clockwise until you get a spark from the coil wire. The manual says you can check this by installing the distributer and pull out the ignition switch, if the ammeter shows discharge, it is more or less (my words) in time and you do not need to rotate it counterclockwise, (points are closed) -- if not rotate it about 30 degrees, then rotate in the opposite direction until it sparks. Dunno why no one else has answered.

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SuperCDon

06-29-2006 05:29:50




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 Re: Initial Carb Settings - Super C in reply to CNKS, 06-28-2006 17:54:36  
Thanks very much for replying. It's a Zenith carb. As mentioned in my reply to CityBoy, I'm not pleased with Denny's. When I received the carb, the choke shaft had the actuator on the opposite side from the throttle linkage...it should be on the engine side along with the throttle linkage. When I called them back, they were real snooty with me...wouldn't answer my questions and just said send it back. The lady who answers the phone actually used caller ID to call me back to tell me that if I did anything to it (even reversing the choke shaft) I would have to pay shop and labor time to have them fix it. Anyway, since I reversed the choke shaft myself, I guess I might as well check the float adjustment myself. I will also check the jet adjustments and timing as you suggesst. Just makes me mad to pay big bucks to get a half - a--d job.

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