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Old 08.05.2009
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diesel in my radiator??
This is my first post and would like to say hi to everyone on the forum...Anyways I drive a 1999 Sterling transfer dump truck. I'm running a 3406E Cat (435hp) and have found that I keep getting diesel in my radiator, but not as much radiator fluid in my diesel tanks. There was always a little problem, but recently when i added more water to the radiator i found that when the temperature reaches 210, diesel gets released from the radiator cap(where excess water gets released from) first because it's less buoyant than the water. Is there a solution to why this mixture is happening??

P.S. It's not that much diesel, but still enough to notice.
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Old 08.05.2009
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Possible problem with the oil cooler.
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Old 08.05.2009
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i dont think oil has anything to do with my situation. I have a problem with coolant and diesel mixing.
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Old 08.05.2009
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Quote:
Originally Posted by socaltrucker99 View Post
i dont think oil has anything to do with my situation. I have a problem with coolant and diesel mixing.
In the radiator?

Then most likely a head gasket problem.

You might google the question and see what comes up.

I missed on the cooler. I remember the event and thought it was diesel. It was oil, now that I look back.

Diesel should never be in the cooler either.
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Old 08.05.2009
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Could it be, (and I'm guessing here) something to do with the injector wells?
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Old 08.05.2009
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I think your right Les2. Injector cups
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Old 08.05.2009
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Injector cup O-ring not an uncommon problem. I would pull all six injectors and cups and replace all cups and o-rings just to have it all covered. It probably has a few miles on it being a 99, while its apart check the injector springs they sometimes break.
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Old 08.05.2009
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Injector cup o-rings are bad, I have heard there is a newer version now that lasts longer.
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Old 08.05.2009
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thats what i had in mind too....for a 99 it had a little less than 400,000 miles on it.
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Old 08.05.2009
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Almost certain it's the injector cup o-rings. Same thing happened to me on a 97 model 3406E I had.
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