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Hi, after 18,800 hrs. and some neglect, my parents´ 5120 could "benefit" from a new set of belt pulleys for the crankshaft, fan hub and alternator. As CNH seems to be selling parts from cheaper sources for these "classic" Case IH tractors, I am wondering if we should be buying "genuine" CNH parts for this job or be better off with whatever Cummins puts its name on? The pulleys sold by CNH are suspiciously inexpensive, so I do not know what to think about them. Right now I am trying to find genuine Cummins pulleys on ebay from reliable US based sellers, but that means buying from 3 places or even more in case we are unable to reuse the bolts and washers. Does anybody have experience with all these aftermarket pulleys sold for B-Series Cummins or Dodge online?
I'm at my wit's end over this crankshaft pulley on my 1940 B. I tried half inch bolts and althread in the crankshaft hole with no luck. I tried a half inch tap to chase the thread and it ate the end of my tap. I tried a 7/16 fine thread tap and it went in fine. I then tried 7/16 althread and it pulled out without getting started. I can't get a half inch fine thread bolt or althread even started into the hole. The threads are not boogered up and I'm officially stuck. Yesterday afternoon I tried grade 5 half-inch course thread, both bolts and althread. No luck. This pulley has a hole for a set crew, but nothing in it. If I could find anything between 1/2" inch and 7/16" I would use that, but nobody has such a creature. I put it in the oven at 400 degrees for about an hour last night and it went on a little easier at first, then stopped with about 3/4" left to get it on completely; I used welding gloves rather than run the risk of my wife making me sleep in the barn with this tractor if I used her oven mitts on this thing. I got it on the shaft and lined up with the woodruff key then my dad held a 2x6 block against the pulley and I hit it until I split two pieces of 2x6, and it finally stopped as I said before, with roughly 3/4" left to go. I don't like the idea of hitting it and running the risk of messing up connecting rods or bearings. I admit that I'm no machinist. I don't have any Farmall guys around me that I can call on for advice or even invite over to sit on a bucket and give my advice. Both of my grandfathers were pretty fair machinists, but they've both been gone for years and I have no brothers or cousins in the tractor mechanic business that I can call on for advice. It's just me trying to get this tractor running for our little girls who are expecting daddy to perform a miracle in the barn and make their pretty red tractor that they've been waiting for nearly a year on to be fixed. I am open to any suggestions. And if anyone feels the need to publicly berate me as another member did on another tractor site by telling me that I didn't know what I was doing, that I better just quit, and that I needed to take it to someone who knew what they were doing, then I guess go ahead, too. Thanks in advance and God's Blessings on you all.