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Case Tractors Discussion Forum
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870 diesel head

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jr567

02-15-2008 20:35:58




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One more question. i remember someone posting on here a while back about head problems wiht an 870. I had a little bit of antifreeze running down the block coming from the head especially if it was being worked hard so i replaced the head gasket. After all this was done i cranked it up and it was blowing quiet a bit of oil out of the exhaust..enought that you could see black on the rafters of the barn at the top. I took the oil plug out and there was lots of antifreeze in the oil. My question is do i have a cracked head? I looked them both over when i was replacing them. Antifreeze is also still running down the block a little like it was before i started.

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jr567

02-16-2008 14:43:28




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 Re: 870 diesel head in reply to jr567, 02-15-2008 20:35:58  
I pulled the heads today and found two broke sleeves at the top of the rear head..one closest to the rear of the tractor. Is the case dealer the best place to get new ones. I know they will be high



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DKase

02-16-2008 19:03:08




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 Re: 870 diesel head in reply to jr567, 02-16-2008 14:43:28  
Make sure you have the counterbores cut, and shimmed up to specs. or it will do it again!



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jr567

02-16-2008 19:37:18




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 Re: 870 diesel head in reply to DKase, 02-16-2008 19:03:08  
what exactly are you meaning by the counterbores.. i know this is probably a dumb question



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TexasWren

02-17-2008 11:32:12




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 Re: 870 diesel head in reply to jr567, 02-16-2008 19:37:18  
The sleeves have a rim around the outside of the top that nestles into a hole that is a little bigger than the sleeve hole in the block, and is only about 1/4" deep. That is the counterbore, and if your block has been faced, it can end up too shallow, which puts excessive stress on the sleeves when the head is torqued. Likewise, if it's too deep, your cylinders won't seal.



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Eldo case

02-16-2008 07:51:27




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 Re: 870 diesel head in reply to jr567, 02-15-2008 20:35:58  
I would bet it is a cracked sleeve at the top flange area. The oil as you call it was antifreeze mixed up with exhaust suet. If it were me I would pull the heads and check the sleeve flange. Also pull the pan first before draining the antifreeze and check the bottom of the sleeves for leakage around the o-rings. It might be a good time for a sleeve job. Be sure to check sleeve hight after installing sleeves. Also double clean the block under the sleeve flange a little dirt can cause another cracked sleeve when putting the head on. I hope this helps.

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bradley martin

02-16-2008 06:59:50




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 Re: 870 diesel head in reply to jr567, 02-15-2008 20:35:58  
Could be acracked sleeve as well.



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jonjon

02-16-2008 04:52:46




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 Re: 870 diesel head in reply to jr567, 02-15-2008 20:35:58  
Don't know what engine you have but the 336bd & bdt had problems with heads cracking not all but most. You are hard pressed to find a set of good used heads for a 336 because of this problem. Not had head gasket problems, out of mine anyway.



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