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Allis Chalmers Discussion Forum

Help-49C has water in the oil

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01-03-2008 18:26:38

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I bought a non running C from a guy. Found water in the oil, removed the head and found the head gasket looked terrible (I assumed to be source of the water). Went ahead and tore the entire motor down, cleaned it, inspected for cracks, and put it back together with new rings and head gasket.

I didn"t find any cracks in the head or block, but when I fired it back up and ran for 5 min, I already had water in the oil.

Anyone have any idea what I missed? What are the most common areas to have water get into the motor. Where should I look for cracks? Anything I can do about it, short of getting a new block?

Thanks in advance for the help.

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01-05-2008 12:56:30

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 Re: Help-49C has water in the oil in reply to rkr29kracing, 01-03-2008 18:26:38  
A longtime mechanic for AC once told me to put a very heavy coating of non-hardeneing Permatex, or Heavy Paint in (carefully so as not to slobber it all over the sleeves) Using a hose.... Into a clean and dry water jacket..

You see, all the ac gas blocks from WD-45, on back tend to crack between the sleeves and it is not a mechanical problem, it just lets some coolant get in the oil..

Just flush the water jacket out until it has no dirt and get it dry and hose in enough Permatex to coat the Entire water jacket bottom.. let it flow all the way around the sleeves and you won't ever have a leak there again..problem gone for ever...! Ron.

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01-03-2008 19:22:08

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 Re: Help-49C has water in the oil in reply to rkr29kracing, 01-03-2008 18:26:38  
As Dick says its either the freeze plugs or the sleeve seals. I have a C engine in my shop right now that had sleeve seal problems and I'm picking up the parts for it tomorrow.

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01-03-2008 19:09:08

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 Re: Help-49C has water in the oil in reply to rkr29kracing, 01-03-2008 18:26:38  

Sounds to me that you have water getting past the orings on the bottom of the sleeves. Did these get looked at or changed when it was down?

that is what I would be looking at happy holidyas

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Dick L

01-03-2008 19:07:59

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 Re: Help-49C has water in the oil in reply to rkr29kracing, 01-03-2008 18:26:38  
first check the freeze plugs under the rocker arms for pin holes. Put low pressure on a full radiator when checking. If no water seeps out of the freeze plugs then remove the pan and do the same and watch to see if water is seeping around the sleeves. Those would be the most likely places it would be leaking.

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01-03-2008 20:03:34

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 Re: Help-49C has water in the oil in reply to Dick L, 01-03-2008 19:07:59  
Thanks for the help. So if I do see water coming from the freeze plugs, or seeping out the sleeves, is there anything I can do about it?

How do you repair this?


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01-03-2008 20:28:33

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 Re: Help-49C has water in the oil in reply to rkr29kracing, 01-03-2008 20:03:34  
If its from a freeze plug you pull the bad one out and install a new one. If its from a sleeve seal you have to open up the engine pull the sleeve out and put in new sleeve o_rings. A set of those o-rings will cost around $15-20 I know because I just ordered a set for this engine I'm building from 2 bad engines

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Dick Lemmon

01-04-2008 08:31:52

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 Hey Old in reply to old, 01-03-2008 20:28:33  
I would have sent you a set of those O rings for a trade of some sort and the postage. I pay less than a buck each for that O ring. I don't sell parts but do trade.

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01-04-2008 10:15:18

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 Re: Hey Old in reply to Dick Lemmon, 01-04-2008 08:31:52  
i had to special order theses or they would have only been about $16 but because of the special order it cost more because of shipping. Now after I get the wood stove going I will go out and install the one sleeve that needs to be put in then the piston etc. I'm doing this as a side job to maybe make s few extra bucks so any parts I get this guy has to pay me for plus my labor

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