Posted by LenNH on January 18, 2008 at 11:38:26 from (75.69.99.42):
In Reply to: govenor repair posted by gene shemek on January 13, 2008 at 15:43:10:
Not sure what you mean. The original IHC governor on all the engines based on this design had two springs that controlled the full-load engine speed. There was not really any governing if you pulled the throttle away from the full-open position. When the weights moved outward with increasing speed, the springs would control just how far they went out and keep the full-load speed where it was supposed to be. The little bulb-like knob that protruded out the back of the governor housing gave just a little adjustment of the full-load speed. The variable governor that was put on this type of engine late in production (I would guess about 1937, but I would have to do some serial number comparisons to know for sure) did not have any springs on the governor weights. The real "governor spring" was the one pulled out by the throttle rod. In this case, the governor weights acted against THIS spring. In other words, the operator determined the spring pressure. On the earlier governors, the spring pressure was pre-determined, which explains why those governors gave real control only when the throttle was fully open. When you pulled the throttle back, all you did was move some sort of mechanism which acted AGAINST the springs on the governor weights. Clear in my head, I hope it works for anybody reading this messy explanation!
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