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Allis Chalmers Discussion Forum

fuel in engine oil

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05-07-2008 02:50:45

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Hi Folks, My AC HD6 has a fair amount of diesel in the crank oil.I had it laid up for the winter and forgot to shut the fuel off at the tank(full tank of fuel).Would that have some how fed into the motor or would it have got there when it was running before I laid her up for the winter.
Any help would be appreciated.

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05-10-2008 20:53:08

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 Re: fuel in engine oil in reply to naz, 05-07-2008 02:50:45  
NAZ, my d-19 had the same problem, it could be the seals on the injection pump shaft if it is a roosa master pump like mine. The fuel can be shutoff to injectors, yet because the pump is bathed in diesel it gets by that double seal into the oil. If you had the pump off that seal is easily flipped over and does not seal well, you need a seal install tool so they dont catch on any lips inside the pump. Hope that helps.

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05-11-2008 06:45:17

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 Re: fuel in engine oil in reply to greatwest, 05-10-2008 20:53:08  
Hey thanks GW,I will look into that.I haven't had a chance to get at it yet but will soon.

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Kentb of SWMO

05-07-2008 06:21:25

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 Re: fuel in engine oil in reply to naz, 05-07-2008 02:50:45  
Is this a DD engine? If so I would look for a bad seal in the fuel transfer pump on the blower or cracked/loose fuel line on one of the injectors under the valve cover.


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05-07-2008 14:22:48

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 Re: fuel in engine oil in reply to Kentb of SWMO, 05-07-2008 06:21:25  
It's a 1960 4 cyl. buda.(sp)engine.

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Kentb of SWMO

05-08-2008 05:11:23

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 Re: fuel in engine oil in reply to naz, 05-07-2008 14:22:48  
Check the injector pump and if there is some type of meshanical fuel transfer pump check it. If there is a transfer pump this would be the cheapest to check first.


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05-09-2008 03:09:12

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 Re: fuel in engine oil in reply to Kentb of SWMO, 05-08-2008 05:11:23  
OK,I will check that.
Thank you,

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