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Case Tractors Discussion Forum

8964 dc-4 carb problem

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tammie butzen

05-15-2005 08:59:23

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Hello...I have a 1951 DC-4 in which I just had the carb rebuilt. After reattaching the carb, we cannot get it to even idle without having the choke wide open. Turning the load/idle adjustment screws doesn't really make a difference. I have seen in previous discussions something about the manifold leaking. Could that be the case? Also, does anyone know the measurement for the float level on this particular carb? Is it 29/32? Any help would be greatly appreciated. Our mag is rebuilt with strong spark, our plug wires are correct and brand new, and the plugs are correctly gapped and sized. Needless to say, the black smoke coming out of the stack is rich. Our mag is also timed to the best of our ability with it not idling well. What are we missing? Spring field work is upon us, and here we are, tractorless. Can anyone get us back in shape?

Thanks. Tammie

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c hess

05-22-2005 07:13:28

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Re: 8964 dc-4 carb problem in reply to tammie butzen, 05-15-2005 08:59:23

If it ran before you worked on it an now is not right or worse you need to zero in on carb! If you had to turn off gas to stop dripping before dirt was in float valve-float has a hole in it an has ome gas inside an will not completely stop fuel when it should or height of float was not correct as others said. However if it does not react to turning adjustment screw as other folks said you mighthave messed up seat or adjustment screw or even seat missing . If you turn adjusting screw in whole way {DO NOT FORCE ) TRACTOR SHOULD RUN till mizture is finally to lean an than stop . yOU CAN than turn 2AN HALF TURNS OPEN AS OTHERS SAID AN IT SHOULD RUN.

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tammie butzen

05-20-2005 17:53:14

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Re: 8964 dc-4 carb problem in reply to tammie butzen, 05-15-2005 08:59:23

I was also wondering if anyone knows the actual horse power and displacement on this particular engine. I have been told it is around 38 horse. Is that correct? Maybe 260cc? I am very new to tractors, and even though they are my passion, I have a lot to learn. Thanks to all of you for your help.

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c hess

05-19-2005 15:20:38

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Re: 8964 dc-4 carb problem in reply to tammie butzen, 05-15-2005 08:59:23

i may have red origional problem wrong . thought it was not getting enough fuel. after reeading again sounds like it is too rich. Did it run before you worked on carb? If ii did something is wrong in carb . Are you cure air cleaner is not plugged? If tractor has good supply of fuel to carb an does not leak excess when stopped something is amiss in carB. (FLOAT ADJUSTMENT OR COULD SOMEONE FORGOT TO PUT VALVE SEAT IN ? ADJUSTMENT OTHERS GAVE YOU SHOULD WORK. iAM RAMBLINB ON HERE but had a float geta hole in it an fill with gas . keep us informed appreciatwe that

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tammie butzen

05-20-2005 17:47:13

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Re: 8964 dc-4 carb problem in reply to c hess, 05-19-2005 15:20:38

It ran well enough before we did the carb kit. A friend suggested we do that. It did have a bit of excessive run out of the bottom. we always turned the fuel off. and there was gas thinning out the oil when we first used it. we have changed the oil since then, and i have taken the oil bath air cleaner off and soaked the pads, changed the oil, cleaned out the debris, etc. when you crank the engine and put your hand over the air intake tube, there is terrific suction. compression is between 130-140. and the oil in the oil bath is the same as we have in the crankcase...30 weight. is that perhaps too heavy, too light? you are correct in your second thought...it runs way too rich, and we cannot get it leaned out to idle properly, let alone move it. we are going to check the float level, hopefully tomorrow. we had the carb rebuilt in maine, and we live in wisconsin. perhaps we do have something amiss in our carb, but the gentleman that rebuilt it seemed to know what he was doing.
thanks again for the input. we'll keep trying.

tammie

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tammie butzen

05-18-2005 16:27:47

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Re: 8964 dc-4 carb problem in reply to tammie butzen, 05-15-2005 08:59:23

Haven't had a chance to work on it. But we did at least make sure the gas line was not plugged...it is not. And the firing order is 1-3-4-2...got that too. It runs extremely rich, to the point of making you gasp and flee the garage. We are going to measure the float distance....I truly think that is our issue. Just have to find the time. Thanks for all your input...it has been helpful. We'll keep you posted. She's a strong runner, when she runs. Got a nice growl, not even a purr. I miss that sound. By the way, does anyone have any idea on the horsepower we are rated at? There seems to be some dusoute. 38 or so? Less then that?

Thanks. Tammie

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caseman2

05-16-2005 18:12:00

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Re: 8964 dc-4 carb problem in reply to tammie butzen, 05-15-2005 08:59:23

Are you sure that the fireing order is correct. this can deal you a lot of misery

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c hess

05-15-2005 10:34:29

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Re: 8964 dc-4 carb problem in reply to tammie butzen, 05-15-2005 08:59:23

Check that you have a full supply of gas to carb. 9disconect line at carb - gas should run full in line if ok attatch to carb an open drain on carb you should have full stream coming out of drain. let run few seconds to be sure. I am thinking you might have dirt in float an carb is not getting enough to run .

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Larry Martin

05-15-2005 10:30:43

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Re: 8964 dc-4 carb problem in reply to tammie butzen, 05-15-2005 08:59:23

The float measurement is 1 39/64". Start out with your main jet opened 2 turns and your idling jet open 2 1/2 turns. Also check that you have good gas flow from your tank as you could have a plugged gas line or sediment bulb.

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Camboted

05-15-2005 16:13:31

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Re: 8964 dc-4 carb problem in reply to Larry Martin, 05-15-2005 10:30:43

This can be real frustrating. It could be someone messed up the carb in rebuilding. Do you have one you can swap off a running tractor to see?

I assume you have a Zenith Carb. Follow the above instructions and advise. Make sure you have a good seal between the carb and the manifold, also get some starting fluid and spray around the intake manifold while it is running to check for air leaks. Make sure your air cleaner is not overfilled or plugged. Check plug wires, and here is what we found on one, while adjusting the mag we got a shock, even though the tractor was running and the mag put out good spark. Pulled it apart and found a bare spot on a coil wire that was shorting out against the housing. We put some insulation on it and away she went.

Another thing is the valve settings, they can be real touchy on a DC. Try pulling one wire off and replacing it, to see if you can isolate the problem. Lastly run a compression check, should have 125# plus on a good engine. LOL!

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