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Allis Chalmers Discussion Forum
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AC 200

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Terry DeBoer

02-17-2006 18:55:28




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We pulled our 200 into our shop to work on. For some reason there is antifreeze and water mixed in with the oil. Before we moved it in we drained a gallon or two of plain antifreeze out. We were figuring it was a blown head gasket. Once we got the head off we could tell it was recently just overhauled or partly. We think they only replaced one piston and honed the sleeves. The head gasket looked good. We took the oil pan off and looked up from the bottom and noticed that there was form-a-gasket where the o rings are at on the sleeves, where the sleeves stick down. We are planning on taking the pistons out and the sleeves out and see what we see there. We are gonna replace the o rings in the sleeves no matter what though. If anyone has any ideas to how all that antifreeze got in the oil let me know.

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Terry DeBoer

02-18-2006 16:30:26




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 Re: AC 200 in reply to Terry DeBoer, 02-17-2006 18:55:28  
We continued taking apart the 200 and found some interesting things. First two of the pistons were all gouged and scored. Also the connecting rod in the first cylinder was a newer style and had a 5 engraved on it. So the guy that was fixing it before us must have replaced the one connecting rod and four of the pistons. When we pulled the pistons out some of them also had the notches in the rings all lined up instead of staggered. The o-rings around the sleeves were shot. They were barely still a ring. Also one of the bearings on the connecting rods was full of gouges. Needless to say the guy who was in the engine beofre us didn't have much of a clue to what he was doing.

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Joe(TX)

02-20-2006 10:34:58




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 Re: AC 200 in reply to Terry DeBoer, 02-18-2006 16:30:26  
It sounds like he did not clean the o ring sealing surfaces in the block or lubricate the o rings before installing the sleeves.



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Hurst

02-18-2006 19:07:19




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 Re: AC 200 in reply to Terry DeBoer, 02-18-2006 16:30:26  
Sounds like your best bet will be a complete overhaul kit. I would do an out of frame overhaul, new sleeves, pistons, rings, bearings, seals, etc. At least this way you know what you have in there. I am not sure what you mean by a "newer connecting rod". I though all of the 200s had the MkII engine with the oil squirters for the pistons in all the rods. I may be wrong, but that was my thought. I would get a rod the matched the rest of the set however, you don't want a different rod in there, that could really throw off your balance. Is this an early or late 200? Sounds like you have a good project in front of you, but when it is all over and done with and you fire her up for the first time and you hear the purr of that ol 301 turbo diesel, you will have a smile from ear to ear. Every time I fire up my 7000, I make it a point while she is warming up to go out of the cab and stand next to the tractor and just take in the smooth sound. Stand by the injection pump and you can hear the clicks as it goes around. Really a neat and smoothly balanced engine. Sure is a lot nicer than the 268 fords we have in our 6610 and 7610. Good luck with her and get er done!.

Hurst

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Eric/allis#1

02-18-2006 12:04:11




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 Re: AC 200 in reply to Terry DeBoer, 02-17-2006 18:55:28  
we had a 190xt with the same engine. When we purchased the tractor we had to do a major overhaul on it. As we tore it down we removed the sleeves and they had little pinholes in the sides. People don"t change antifreeze enough and it will become corrosive. More likely than not the block is fine although one might get the head checked over



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Joe(TX)

02-18-2006 11:37:41




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 Re: AC 200 in reply to Terry DeBoer, 02-17-2006 18:55:28  
You need to check for cracks in the block between the cylinders also. That could be the the source of the leak. Not an uncommon problem.



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Kent of SW MO

02-18-2006 10:30:09




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 Re: AC 200 in reply to Terry DeBoer, 02-17-2006 18:55:28  
You could also have some sleeves that have developed some pin holes in them.

Kent



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jR64

02-17-2006 20:13:20




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 Re: AC 200 in reply to Terry DeBoer, 02-17-2006 18:55:28  
Either you have an oil cooler leaking coolant into the oil.....not likely as you'd have oil in the antifreeze instead, or the block is pitted out where the o rings seal. We had that happen to an XT that we had. You either find another block or have your block machined out and a sleeve installed.



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