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Farmall & IHC Tractors Discussion Forum
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IH 684 water in oil

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Stuart Walker

10-17-2005 07:28:10




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I have a 684 tractor with a D239 Neuss engine. Its been prone to overheating for some while, but now I've got water in the oil. I've removed the cylinder head and there is no obvious leak. Assuming I still can't find anything after a closer examination, whats the chances that a cylinder sleeve seal has failed?




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Stuart Walker

11-27-2005 11:13:29




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 Re: IH 684 water in oil in reply to Stuart Walker, 10-17-2005 07:28:10  
I've had a go at pulling the liners out without success. Does this mean that they are rusted in, or am I going about it the wrong way? I've placed a short bar at the bottom of the cylinder liner that sticks out abot 1/4" from the bottom of the block and have alarge bolt up through the cylinder with a bar across the cylinder top and two packers sitting on the block, not on the liner, underneath this bar. The bars are about an inch thick, and I can start to bend them and the liner has not moved. I've tried all four with no movement. If they are rusted stuck any suggestions on how to free them, or is the block scrap?

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Stuart Walker

11-14-2005 12:30:06




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 Re: IH 684 water in oil in reply to Stuart Walker, 10-17-2005 07:28:10  
I've eventually got round to taking the pistons out, and the leak is a pinhole in the bottom of no. 4 cylinder liner. I guess it has rusted through. Judging by the amount of erosion around the water channels in the top of the block I guess it hasn't had much inhibitor in the water recently. Anyway to get the liners out I'm intending to make a puller with a long bolt and some cross bars to pull against the bottom of the liner and to bridge across the top onto the block. If I manage to move the liner the small amount it is sticking out of the bottom of the block will they then come out easily?

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MN Scott

10-17-2005 19:06:31




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 Re: IH 684 water in oil in reply to Stuart Walker, 10-17-2005 07:28:10  
I would say its a 90% chance that its the sleeve seals that are bad. On the kraut engines they used just one ring and it is a very common problem. I bet when the sleeves are pulled the ring will crumble in your hand. They also used two different sized O rings that go by engine serial number so make sure you get the proper replacements.



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JB2

10-17-2005 14:22:31




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 Re: IH 684 water in oil in reply to Stuart Walker, 10-17-2005 07:28:10  
Hi Stuart, If it has been overheated 9 out of 10 the problem is a leaking "O" ring on the cylinder sleeves. The colder it gets outside the more it will leak. About 20 years ago my Dad had similar experience on his 454 D179 Neuss. He was plowing with it when the fan belt broke and thought he would just drive it the mile back to the shed but by the time he got back to the shed the temp gauge was in the red. Made it thru the summer by loosening off the rad cap so there was no pressure in the rad but when fall came and the temp started to get down to freezing at night the "O" rings would leak. Had the "O" rings replaced and 454 is still running like a top.

JB2

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El Toro

10-17-2005 09:15:26




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 Re: IH 684 water in oil in reply to Stuart Walker, 10-17-2005 07:28:10  
You could have the head magna-fluxed while you have it off, this would eliminate the head if it checks out ok. Look closely at bottom of the sleeves for any signs of antifreeze. Using air pressure would be better as suggested. Hal



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CEB

10-17-2005 07:59:05




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 Re: IH 684 water in oil in reply to Stuart Walker, 10-17-2005 07:28:10  
Its too bad that you removed the head, now you will have to take some extra steps to see if the sleeve O-rings are leaking.
You will have to put the old head gasket back on and torque the head down to spec's. Then get a radiator pressurizer (you could probably get one at an auto parts store). Remove the oil pan and install the pressure tester in place of the radiator cap and pump it up to normal operating PSI (usually says PSI on the radiator cap). If you have bad sleeve O-ring, you will see it dripping antifreeze.
Hopefully, a sleeve O-ring is the problem, since a cracked head or worse yet, a cracked block will run into more $$.

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