Years ago you had a supply line and return line from the heater coil inside the cab. The heater control was mechanical....cable from inside cab to butterfly flow valve in one of the lines....supply I guess under the hood.
If that valve stuck closed, like would happen in the summer with no use, you would have the problem mentioned. Problems I had I noticed that the cable would move, the cam on top of the valve would move, but the connection between the cam and the shaft that led to the butterfly that controlled the flow had broken. Butterfly was frozen closed and hence no hot water flowing through the heater radiator in the cab. New inline valve solved the problem.
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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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