Quote from: "subsonic"Some more info:"So do you take the taper out of the shaft? What about the lobe that is on the shaft, near the gear end, that drives the vacume pump? Do you take that off as well?"Reply:"I take the taper out of the intermediate shaft as well as the bump."From doing a bit of reading, it appears that the IM shaft is pretty rough, and I suspect, not very balanced. :idea: I am going to put forth the hypothesis that the IM shaft being out of balance is one of the leading causes of the dreaded IM shaft bearing failure / flaking.I would further suggest that balancing the shaft will reduce or eliminate many of these failures. :idea:Interesting!!! Then how do you run the vacuum pump, once you've installed the new lightened/balanced/bumpless IM shaft?J.R.
Some more info:"So do you take the taper out of the shaft? What about the lobe that is on the shaft, near the gear end, that drives the vacume pump? Do you take that off as well?"Reply:"I take the taper out of the intermediate shaft as well as the bump."From doing a bit of reading, it appears that the IM shaft is pretty rough, and I suspect, not very balanced. :idea: I am going to put forth the hypothesis that the IM shaft being out of balance is one of the leading causes of the dreaded IM shaft bearing failure / flaking.I would further suggest that balancing the shaft will reduce or eliminate many of these failures. :idea:
[/img]
Man I got my IM shaft just sitting here...I think I may throw it in the lathe today and turn mine down.so did they take the tapper completely out of the shaft??this should be a real easy job...I will weight mine before and after too.
Quote from: "53 willys"Man I got my IM shaft just sitting here...I think I may throw it in the lathe today and turn mine down.so did they take the tapper completely out of the shaft??this should be a real easy job...I will weight mine before and after too.Correct, taper was removed. After the old gasser lobe was removed, it is just a matter of removing the taper with a few passes until you have the same dia at each ends. You can also turn behind the gear a bit if you want. I would not turn it too much. Finish up with emory cloth. If you have the equipment or access to the equipment go for it.
Worthwhile is subjective. The part needed to be replaced, and he all ready had it at the machine shop. Turning the shft is a very simpy job. Cost should have been low. There is no question that the part is improved. Balance has been improved and weight reduced, both good things. Is it the same as a flywheel turned down to 10 pounds? No. Does it help with engine performance / longevity? Yes.Would I pull the IM shaft just to turn it? No way. If I had it out during an engine rebuild, and had the opportunity to improve it at a low cost, would I? I sure would. Lots of small improvments add up to a better engine, cost goes up, but you still end up with a better product.
I never heard of a diaphragm vacuum pump, the lobe is there for a diaphragm fuel pump in the gasser applications.I remember seeing a pic of it being used on a diesel, but on a early stage of development of the 1.5D.
dodge used this engine as a gasser. i think it had a mechanical pump which would be where the lobe was. not 100% certain thoughquestion i have is how are the harmonics of this new engine? does it idle smoother?i've made thousands of those shafts for other diesels, and unless someone overgrinds one they should all weigh the same.my thinking for the taper is, the shaft was smaller going to the lobe, where extra material was added (for the lobe). then making it more balanced in gerneral but not very perfect.
Topic: Lightening and balancing the intermediate shaft. (Read 17953 times)
