Diesel in coolant????

[usmcknight69]

Long story short. Truck went into ford because the oil cooler o rings and gasket was leaking coolant. Now ford is telling me I have diesel in the coolant system. What would cause this? They are telling me it is probably a cracked head/heads. The truck was studded a while back. Doesn't a head only crack if it overheats? WTF?


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[a2elvis]

A cracked cylinder head is the ONLY was for diesel fuel to get into the cooling system. Just another great 6.0L failure spot...

[dannyboy950]

When your heads were studded were the heads checked out; flatness; pressure tested?

If this was not done you could have had bad heads all along. Some people do studs one at a time and never even pull the heads.

Metal fatigue, electrolisis, casting defects can also cause failuers not only overheat.

[southend]

Originally Posted by a2elvis

A cracked cylinder head is the ONLY was for diesel fuel to get into the cooling system. Just another great 6.0L failure spot...

Actually, a bad injector cup could allow fuel to enter the cooling system also. It's not common on the 6.0.

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[Snake]

A cracked injector cup on a 6.0 will only allow diesel to get into the coolant if the head has cracked also.

[Lambo3244]

Originally Posted by southend

Actually, a bad injector cup could allow fuel to enter the cooling system also. It's not common on the 6.0.

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^^^^^^^^^^^^^^

Correct. I noticed a thin film of black residue on the top of my coolant and it was diesel for sure. I had two injector cups fail with small hairline cracks on the inside of the cup.

[Big Angry Hillbilly]

There's a TSB for fuel in antifreeze due to cracked heads, don't remember the number offhand.

[usmcknight69]

Now you guys have me wondering.....ford replaced 3 injectors a few months back. Never had any issues with the truck until then. Now you guys are saying that a fuel injector cup could also cause diesel to leak into coolant. Is the only way to verify if it is a cup or head itself to do a pressure test?

[a2elvis]

Originally Posted by usmcknight69

Now you guys have me wondering.....ford replaced 3 injectors a few months back. Never had any issues with the truck until then. Now you guys are saying that a fuel injector cup could also cause diesel to leak into coolant. Is the only way to verify if it is a cup or head itself to do a pressure test?

Okay, here I go...

If the lower o ring on the injector failed and the injector cup failed at the same time that would be the only other way for the diesel fuel in the coolant. It would have to be the perfect storm, highly unlikely.

There is absolutely NO fuel in the injector cup if the injector is tightened down properly. The bottom o ring on the injector is above the sealing edge of the injector cup.

I found this the other day, good pics of a cracked head and where it cracks to get the diesel fuel in the cooling system.

http://www.facebook.com/bulletproofd...type=3&theater

[southend]

I put nothing past the 6.0 . Hehehe.
I don't have or never will, a facebook account. Can't see the pics in the link, but I think i've seen them before.

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