O/T Ford 6.7 problems.

fixerupper

Well-known Member
This isn't a tractor but some of you guys know Ford Pickup diesels pretty well so I'm asking here.

My neighbor bought a F350 dually with a 6.7 and a little over 200,000 miles on the clock. He was driving on the interstate when it developed tremendous blow by, blowing oil past the front crank seal and emptying the oil pan. He shut it down as soon as the oil light came on. Had it towed to a dealer, the dealer mentioned scored Pistons somehow caused by cylinder wash down from a malfunction during the regen cycle? I'm scratching my head on how this can happen. This is the story told to me by the neighbor. Can this happen? If so, how?
 
Well I'm sure trying to figure it out. When he said 05 a red flag went up in my mind, figuring it is too old for regen. I do know he said the dealer told him the cylinders washed down because of a regen problem. Like David said it doesn't make sense. It regens AFTER the engine, not into the engine. As you can plainly tell, I'm floundering on this one.
 
DEF, and DPF are two separate things. DEF is basically to control NOx emissions and its injected into the exhaust. DPF is basically an exhaust filter that traps particulate "soot" from the exhaust. As the soot builds up in the filter a regen process takes place. This is when fuel is injected in the exhaust (after turbo) to raise temperatures to burn off the soot. Here is the dumb part EPA doesn't care about, more fuel is used to make cleaner exhaust and the soot never goes away, it's just broken down into smaller pieces. More of those pieces become airborne but harder to see, more pieces will float around and get in your lungs too.
 
The extra fuel for the regen can be injected in the engine, it is not always done with a separate injector at the DPF. The engine can inject fuel into the cylinder on the exhaust stroke to provide the extra heat.
This is quite common on lighter duty diesels. The Ford 6.4 was setup this way, not sure how the 6.7 is done. I have seen similar comments about the 6.4, never paid much attention as I have not owned one. If it were
a 6.0, I have had an injector go bad, and you could possibly have the wash down issue, but the cloud of black smoke is a give away that something is wrong.
 
Oh snap! Haha I have too many of these diesel emissions systems running through my head. Anyway the DPF and regen systems started with the 6.4 and both engines ( 6.4 and 6.7 ) inject extra fuel into the cylinders exhaust stroke. The 6.4 had big problems with this, washing the cylinders and rings and galling, causing more blow by and more problems.

If regen bothers you then you can be proactive about not letting your truck need to do this as often. Regen is necessary with exhaust temps don't get hot enough to burn off the particulate. Exhaust temps only need to get around 950-1050 or more to work. This is one of those things where it's actually better to run it harder or pull heavy loads down the highway. Sadly a lot of these trucks are family vehicles or even soccer mom rides, trucks that never see a trailer or haul heavy loads, those are the truck with more problems, only exception is excessive idle time trucks
 
6.7 Use's DEF doesn't use Fuel to regen.. You must have a issue with Fuel injectors
or pressure regulators, my best guess is the High Pressure Pump can leak into engine oil.
Urea is injected on the exhaust side & won't cause a Wash out.
 
If the truck is an 05, it does not have a 6.7 and does not do regens. It could still wash down the cylinder walls due to bad injectors if I'm not mistaken.

Part of the story is missing here. Either it's an 05, or it's a 6.7. I have not heard of this problem with the 6.7's.
 
Thank you guys for filling in some loose ends for me. I'll do some more asking. There is a slight chance I will be replacing this engine for them.
 
OK, I sent him a text with the question and his answer was an 08 with a 6.4. In retrospect I should have sent him the text before I started this post. He was quoted $20,000 to replace the engine by one dealer but another dealer will supposedly do it for $12,000. He was talking junking it out and I thought, oh no, you can't do that. I mentioned putting a Cummins in it but that sounds like a lot of work and probably no cheaper.
 

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