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Allis Chalmers Discussion Forum

Engine oil in the radiator

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Author  [Modern View]

12-12-2008 06:07:44

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I'm getting engine oil in the radiator on my Allis Chalmers 190 XT Series 3 with a 301 diesel engine.

I took the oil cooler out and pressure tested it and found no leaks. This problem started after I replaced the water pump which was not leaking but had a wobbly shaft. Could there be a connection between the water pump and getting oil in the water? There is no water in the oil.

The only other time I had oil in the water was on an Isuzu engine and it had a cracked head.

Does anyone have any suggestions?

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kennan gunderson

12-19-2008 01:43:07

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 Re: Engine oil in the radiator in reply to Macduff, 12-12-2008 06:07:44  
The oil cooler has orings for sealing.
there is a wep hole thst oil will come out when the orings are bad. It's soound like you just need to replace the orings.

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12-19-2008 05:13:40

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 Re: Engine oil in the radiator in reply to kennan gunderson, 12-19-2008 01:43:07  
My oil cooler is different. It is basically a 2" tube with a bunch of small tubes running through it. It is all brass and water runs through the small tubes and engine oil runs around them.It has a short piece of radiator hose on each end.

I'm thinking it has to be a bad head gasket or cracked head.

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12-12-2008 06:53:40

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 Re: Engine oil in the radiator in reply to Macduff, 12-12-2008 06:07:44  
father in law had 2 of them we had to pull the heads and replace head gaskets, 1 had to have the cracked head fixed. Its been 20 years since we worked on them and I cant think that the water pump would cause oil in the water.

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David Maddux

12-12-2008 06:26:34

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 Re: Engine oil in the radiator in reply to Macduff, 12-12-2008 06:07:44  
I am not familiar with that motor, but if there is freeze plugs in the head, you might take off the valve cover and see if they are rusted out. That will pump oil right into the block.

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