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Milica Virag
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What causes fuel to seep into coolant?

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My coolant smelled like diesel for few months now. Finally it justI kept sputtering through the overflow tube at the overflow tank. What irks me is that I replaced a hose that goes to the overflow tank and was busted, they told me there was smell of fuel, but couldn't tell me why. Then another hose busted, replaced it. Went into shop for shredded alternator belt and had to replace mount for it, ouch, it alone costs $350, plus labor. At that time told the guys to replace right top radiator hose, which they did, and they did not smell or alarm me to fuel in the coolant. One thousand miles under load later, I stop where I am at and pull one and half gallons of fuel and muck, off the top in the coolant overflow

Here they tell me that there is a leak in an injection tubing and that I need the head replaced. This costs $4500 so far at United Engine in Oklahoma City, OK. I have been waiting three days, weekend and maybe they'll have it done by the end of the day on Monday.

This was not a small job, but I am impressed at the manner they did the work. Shop is stremlined with workers, mechanics picking up where other one had left off, by paperwork, the way nurses do when they take care of patients and switch shifts. They have two shifts and a department for building engines. When they replaced the head and flushed the coolant system, they washed it all with down, sudsy type of solution, and filled it with pink coolant, but they couldn't confirm that it was extended life. Mechanic said it is the type Detroit uses for their engines. They buttoned it up and took it on test drive and the engine light came on, codes read something wrong with the jake brake. They had to pull the cover off and take a look, deciding that it was electrical, and that they pinched the electrical harness when placing the cover on. They ended up installing new harness in and putting back everything together, resulting in 6 hours delay, which they did not charge me for.

Milica Virag,

Strange thing happened afterwards. Before I had an inframe done last year, at Modern Fleet in Charlotte, NC, the oil pressure was in 40 to 50, when they did the inframe, oil pressure dropped to 32, and stayed there. I told them about it, and they replaced oil pump, which did nothing. But now with this new head, my oil pressure is back where it was before, with no changes to the oil system. United Engines, in Oklahoma City, OK guys tell me maybe it has something to do with orings, they replaced. Hope this helps!

Milica Virag,

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Jackie Wormley
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Its your injector cups. What year and engine do you have?

2001 Detroit 60 and they told me injector tubing, but i guess that's same as cups. They don't replace them any more they just swap the heads. While cups are $20 each. Without tools, it is difficult to work on this though.

Milica Virag,

OK yours is the same year as mine. The injectors cups or tubes are not just replaceable as they used to be. You used to be able to just take them out when you took out the injector. Now they have to pull the head and since your there you might as well just get the new head too.

Jackie Wormley,

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Your
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I would also add that if the fuel has been in the cooling system long you should replace all the water hoses because it will weaken them. I had a bud that had the same problem and he popped two hoses before replacing the rest of them.....''italic text''

I had three hoses pop before I got this thing fixed. so hoses are new now, system flushed and steamed. They did a good job at United Engine in Oklahoma City, OK

Milica Virag,

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