engine failure

Piston warped from too much heat.

Timing re - tarrrded and/or too much fuel.

 

looks like bad piston oil cooling nozzles

 

Yep, check the nozzles.

 

piston cooler damaged or pluged or bent or broke. injector over fueling. water got to hot.

 

Would pay to check the oil supply to the cooling jets, I have heard rumors of the glue in some oil filters separating and blocking cooling jets,

 

another thing that it could be. a air deficit. cac leak, turbo boot leak, turbo or turbo's going out. which will let the cylinders heat up.

 

What do the top of the pistons look like? How long do you let the engine warm up after sitting all night before putting a full load on it? I've seen carnage like this on an engine that was put under full load stone cold everyday til it blew. The pistons expand quicker than the liners and you get equal scuffing in every hole.