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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Re: 1952 Cat D4 7U help spun rod bearing

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Old Magnet

05-29-2013 17:08:04

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It is not necessary to pull the engine to remove the crank. Requires removal of auxilliary spring to engine nuts then jack up the engine to where there is sufficient clearance to drop and remove the oil pan over the equalizer spring.

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05-29-2013 18:17:29

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 Re: 1952 Cat D4 7U help spun rod bearing in reply to Old Magnet, 05-29-2013 17:08:04  
I've never pulled one from one of the old D4's myself, so school me please. I can understand how you get the oil pan down by doing what your saying, but I can't see the crank coming out the bottom like that. I say that because most of the CAT's I've worked on you usually had to have at least part of the front cover off for the nose of the crank to clear on that end. Then, on the rear you had to have the TQ or clutch, flywheel, and often the flywheel housing, etc, etc, off for clearnace on that end.

Like I said I've not had one of old 4's down myself, but to me what your saying doesn't make sense based on my past experiences. Please explain so I'll know better next time. Thanks, Wayne.

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Old Magnet

05-29-2013 18:29:19

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 Re: 1952 Cat D4 7U help spun rod bearing in reply to NCWayne, 05-29-2013 18:17:29  
Well, your absolutely right, had it in my mind to access the bearings by pulling the pan. Still have to deal with the front timing cover and flywheel housing to remove the crankshaft so pulling the engine is required. Sorry I misled you.

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05-30-2013 21:36:32

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 Re: 1952 Cat D4 7U help spun rod bearing in reply to Old Magnet, 05-29-2013 18:29:19  
Thanks for the answer. I'm the kind that learns all I can, so I tend to know a little about alot of things, ((and sometimes alot about a few things..LOL)) but I also know that there are alot of others out there that know alot more about alot of those same things than I do. That said I had a feeling that what you had in mind was accessing the bearings and basically doing an inframe, as that thought crossed my mind at first too, but your first answer had me questioning myself, so I had to ask.

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06-01-2013 16:36:28

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 Re: 1952 Cat D4 7U help spun rod bearing in reply to NCWayne, 05-30-2013 21:36:32  
Wayne : Now granted this was in the late 40s or early 50s but at that time local NAPA store had a man that would come to the FIELD and grind a crankshaft. Now I am not certain he could grind rod journals can,t see how that would work but my grandfather had a dozer go down and they did grind (Maybe only one journal) the shaft in the machine. I was like you on Olds post on removing the shaft from the bottom.

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