Our shop parts guy owns a 2003-2004 6.0L. He was driving home the other day, radio on, and he noticed a loss in power and surging on the highway, like it was before we reconditioned his turbo a week ago. He turned his radio down, heard god awful gear grinding noise (thats how he explained the sound anyways), and then a big bang and the engine stopped.

We figured it was wasted when we went to check for oil on the dipstick and the dipstick wouldn't come out. Engine wouldn't turn over either.

Finally pulled the engine and dropped the pan. Found a rod and piston pieces as well as a hole in the side of the block.

Now what is interesting about this catastrophic failure is what the rod looked like. The piston was still in the bore, and obvious pieces of the skirt were scattered in the pan, but the rod was stretched and broken at the piston end. Far back #8 cylinder is the one that let go.

So we have a piston still stuck in the bore, a rod that ripped a wrist pin through the piston, a wrist pin that ripped through the rod, and a rod journal cap that is still half bolted to the rod, but broken to pieces.

The piston end of the rod bushing was ripped out in the same shape as its corresponding bore of the rod, and the crank end rod journal bearing rolled up.

Bushing/bearing surfaces perfect, no sign of lost oil pressure, no sign of wrist pin/rod overheated from getting hot, no sign of journal bearing having spun in rod bore, no bent valves, no broken glow plug. We haven't pulled the head yet or the injector, but this is a peculiar failure.

Anyone have any guesses before we pull the head as to what happened? This truck is stock, no tuner, no nothing. I am going to take some pics of it if anyone cares to see.

 

Strange senario indeed. Will be waiting to hear more on your tear down.Possibly debris fell in the intake on turbo job.

 

Would love to see pics!

 

Highly impossible scenario. Neither the intake nor the cold side charge air cooler tube require removal, to remove and recondition the turbo.

 

Was the intake off for some reason?? Something get in it ??

 

Of course I am just taking stabs in the dark here since we can't know everything about the situation. Is there any chance there is a hole in the air supply pipe or the filter was not sealed right..No offense intended just trying to come up with ideas to lock up that piston. I am guessing it did not pull metal.

 

Yeah, definitely not possible. The truck ran for at least 3 or 4 days before this happened.

Funny thing, my dad is the one who did the turbo recon. He's shop foreman, so hopefully he didn't screw up something like!..Haha!...

I haven't looked at the cylinder wall yet, so I can't say whether or not the piston overheated or not.
My initial guess at the moment - Clogged piston cooler. I have never seen one lock up a piston like that, but sometimes anything can happen.

 

The only thing that I can think that would make this happen without visible damage to bearings and bushings is the tappet galleries that supply oil to the piston cooling jet on that cylinder has to be the point of failure or the cooling jet itself. The is no other reason why one cylinder will experience thermal lock up like that and just seize inside the cylinder. Just my opinion.

 

and for some reason my first thought was J-jet too.

 

Well, unfortunately, the customer does not care to know what happened. He just wants the engine replaced and get it back on the road, and our supervisor does not want to tear into it to find out whats wrong (cause no one is paying us to do that), so no internal pics, only rod pics. After examining it further, it almost looks like a piston cracked or something, wedged itself in the cylinder bore, and the crank just kept on turning until it jammed to a stop.

Notice the twist and pull that the rod had ungone. Also the rod bolt head that is popped off. That almost feels like a weak point to me, but its hard to tell. Fun stuff!