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When to check bottom end on 70 series Case

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Larry in AB

02-06-2003 16:17:45




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I got a 970 with around 6700 hrs on it. The engine doesn't burn much oil about a quart every 12 hrs. which its done for years. It seems to burn less when working harder. And worse when bouncing over a rough field baling hay. Anyway I'm not concerned about oil useage or compression at this time. Its the bearings I was wondering about. I've heard with some engines like older JD's its good to do the bottom end at around 7-8000hrs and they will run that long again before the top end needs to be overhauled.

How about these old Cases do the bottom ends need attention at 7-8000 hrs? Would be a cheap do it now before it spun a bearing or something. I know of guys running them over 10,000 hrs and do nothing but why take the chance of doing major damage.

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Don

02-07-2003 19:40:30




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 Re: When to check bottom end on 70 series Case in reply to Larry in AB, 02-06-2003 16:17:45  
Your oil pressure gauge will tell you. If the pressure drops much when warmed up good, then idling, it may be time to change them.



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DKase

02-06-2003 20:44:10




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 Re: When to check bottom end on 70 series Case in reply to Larry in AB, 02-06-2003 16:17:45  
I often wondered about this myself. Dad and I run an 830 up to 15,000 hours before it crapped out. By then it didn't make much difference what went first because it was SPENT. It was SHOT end to end. I pulled the pan a couple years later when I needed a crankshaft for a 680 backhoe. I found the tabs on the bearing inserts wore off and the rod bearings spun. An ounce of prevention would save a ton of cure! I have a 970 going on 9000 hours that looks like new. I plan on pulling the pan for a look when I install a throw out bearing in a couple weeks. If I promise to let you know what I find there would be a better chance that I actually do it. Bug me about the end of next week so I don't just let it slide. Thanks for the reminder!

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Allan C

02-06-2003 20:55:19




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 Re: Re: When to check bottom end on 70 series Case in reply to DKase, 02-06-2003 20:44:10  
If you wanted to replace the rod shells it would probably be a good idea. But my experience with these is that the crank frequently dies because there's antifreeze in the oil from the o rings around the sleeves leaking. If you loosten the plug after it's been sitting for several days you can tell if there's any antifreeze. They wont stand much of it in the oil, especially if your working it. Ask me how I know!

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