460 carb too rich

Greg Kock · Apr 6, 2010

I have a 58 460 that runs way to rich I have done the basic tune up points wires plugs point gap is .20 and plug gap is.25 and have soaked and rebuilt the carb with a new float set to 1 5/16 per my I&T service manual. All of my parts replaceing and adjusment have done nothing still runns rich smokes black under acceleration. Leans out a litte in the winter months I suppose because cold air is denser. Any help would be greatly appreciated.

pete 23 · Apr 6, 2010

Normally a 460 has a calibrated main jet that you just make sure adjusting screw is not restricting it . The original intent of the adjusting screw on high speed jet was to lean them a little under light load conditions. Just wind her out when warm, screw it in until it starts to lean out and back it out a half turn for a starting point. Don't want to run it too lean if you use it for any amount of pulling though. Some of these tractors have the main jet drilled out in an attempt to reduce the spitting and sputtering when you open the throttle. Finding a new correct jet can be real challenge.

Greg Kock · Apr 6, 2010

from what i understand this carb has a fixed jet or oriface I&T says 3 turns out for naormal operation and 5 for max power im at 3 but no matter where i put it the engine nevers goes leen or dies from being to rich. I am curious about what you said about drilling the oriface do you know what the original dimensions are.

pete 23 · Apr 6, 2010

First of all, if you cannot kill engine by turning main jet adj screw in, you have too short a needle or wrong angle to match the main jet. Three turns is just a general setting as every carb is different. If you look at the CASEIH online parts manual you will notice that they list three different main jet sizes, number 44 in parts diagram of carburetor. They show a .046, .045 and a .054. All jets and nozzles and air bleeds are matched up to get you the correct mixtures at varying speeds and loads. Changing one may sometimes change another. Over the years many different stunts have been tryed on these engines to change performance. It can be difficult to determine which jets have been drilled or interchanged sometimes. Many of these carbs were converted from double to single venturi so I cannot tell you which main jet you have but single takes larger jet. At any rate, you should be able to turn screw in to lean it out and even kill engine, if you turn it out several turns,(like more than five)it should not smoke black. Some times, one has to find a good running identical tractor and duplicate it's carb parts.

heavy hauler too · Apr 7, 2010

They usually just don't speed up with out gaging first. Your lucky it runs ha!! Ours did that 50 years ago.

460 carb too rich

Greg Kock

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pete 23

Well-known Member

Greg Kock

New User

pete 23

Well-known Member

heavy hauler too

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