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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Re: 1952 Cat D4 7U help spun rod bearing

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05-28-2013 18:33:17

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If the journal on the crank is OK then there's no reason you can't replace the parts with the engine in the frame. If the journal is going to have to be ground to repair it, then by default they all will. In that case the engine will need to come out. While it's out, think about it, something caused the rod bearing to spin, be it low oil pressure, trash in the system causing a blockage to that bearing, etc, etc. Because your already having all of the rod journals ground your going to have new bearings in all of those spots, and while the crank is being ground why not have the mains checked too, and on, and on. Basically one part of the repair begs for the other, whch begs to go one step further to do it right, and on, and on. In other words you might as well plan to go ahead and do a full rebuild while you've got the engine out and torn down, just to be safe. Personally I've seen too many people decide to 'cheap out' and not do it and come to regret it later....

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05-28-2013 21:03:21

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 Re: 1952 Cat D4 7U help spun rod bearing in reply to NCWayne, 05-28-2013 18:33:17  
Thanks for the reply. I been trying to figure out this machine. The machine has no wear showing on pistons and liners or valve train. The only thing I seen funny was the thermostat laying next to the seat. This machine looks to be low hour machine. I was thinking he overheated machine or ran it low of oil on his hilly property. It's the forth piston rod back from front of engine I was thinking farthest from the oil pump. Thanks for your help.

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