Posted by mEl on March 12, 2011 at 04:12:15 from (71.245.55.92):
In Reply to: Case DC-4 carb. posted by 960 on March 11, 2011 at 23:14:02:
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That's not an exact science, a good starting point would be one turn off its seat for the top small idle screw and 1.5-2 turns off its seat for the lower main jet. After the tractor is running, allow it to warm up a bit and then while running it wide open turn the lower jet in slowly till it starts to stumble and then back out till it runs smooth again, then an additional one half turn, see if it will accelerate without stumbling when the throttle is opened wide open quickly and if so you are ok, if it stumbles try opening it a bit till it accelerates smoothly. After it is set on the bottom jet, the idle speed is the small screw on the throttle shaft, set it at the speed you want it to idle and then set the small top idle mixture screw to the smoothest idle. After this process you may just want to run back over the adjustments as often the adjustment of one will slightly affect the other. I have been working on DC's all my life as Case mechanic and also build puller engines for them. When we farmed I would like to have a dollar for every hour I spent on my 39 DC of which I am presently doing the engine over. They are a great tractor and I sincerely hope you enjoy yours. mEl
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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