Fuel pump 2350. Can’t get toppets out.

[JimT]

you can see the damage to the crankshaft in the pump, it's done.

like rawze said, you need to do extra work trying to make sure the debris is cleared out of the engine.

First thing i would do, the easiest to start with, would be to pop the top and thoroughly inspect the cam and the entire overhead.

Also, piston cooling nozzles could clog up if there's a big enough chunk.

Cam and all the bearings are probably the most sensitive to smaller shavings, while any oil passage can get clogged up with bigger chunks. It could literally be anywhere inside that engine.

When mine went I had absolutely no clue about any of this. Drove for almost 6 months with the occasional 559 code popping up, wasn't constant. When I finally learned about it and realized what happened I replaced the guts in the fuel pump. That was the first repair I personally did on this truck, instead of paying someone else. Mine had the ceramic plungers and one had got stuck and about 1/3 of it was missing. The metal tappets had wear but the pump crank looked ok at the time. At that point I figured the damage was already done and since I was still mostly broke I drove the truck for another year before I discovered some damage to my cam. When I inframed it you could see where small debris had gotten into the bearings and scratched them up. Replaced the cam, rollers, all the bearings, usual inframe stuff, also replaced the fuel pump and oil cooler.

The only thing I credit for keeping that engine alive, prior to the inframe, was pure dumb luck. Don't be like me.