Posted by MHMalcolm on July 14, 2009 at 15:40:52 from (66.66.148.252):
In Reply to: M diesel engine posted by Nathon on July 14, 2009 at 09:50:06:
OK, this is kind of off the wall, and somewhat embarassing to have happened to an experienced tractor mechanic, but I have to throw it out there.
My Dad's Farmall 400 gas tractor developed what sounded like a slight engine knock. It wasn't loud, but it was there and didn't seem to vary with load. You could hear it the most when the engine was idling, but it was there all the time. I had done a complete stem-to-stern reconditioning of this tractor about 600 hours prior to this, and everything in the engine was brought up to new specs. I ended up pulling the pan off and Plastigaged all the bearings and found nothing wrong, so I put the pan back on. My Dad wasn't using the tractor that much, but I told him he could keep using it just as long as the knock didn't get worse until I had any new brainstorms. One day he was out using it and the wiring going to the regulator melted and the regulator started smoking. He got it shut down and the battery disconnected before it burned things up too bad. After checking things out, I found the bushing at the back of the rebuilt generator that I had gotten from the local Carquest had gone bad from lack of lubrication because nobody had bothered to drill the wall of the bushing and install the oil wick. It had run dry and wore enough to drop the armature down into the pole pieces, then rubbed through the insulation of one of the brush wires, causing the electrical short. I rebuilt the generator myself and reinstalled it. After I got the engine started and verified the electrical system was working OK, I realized the engine knock was gone. Then I realized the cause of the knock had been from the armature hitting the pole pieces, and the noise was telescoping in such a way that it sounded like a slight knock. That was 4 years ago, and the knock hasn't returned, so I guess that was it. Just some food for thought.
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