N14 Top End Knock

That is most definelty a thorough write up, thank you very much for that, and to everyone who's helped get this truck on the road over the course of the last 2 months.

 

Update from driver, the injector and exhaust push tubes failed, he thinks he set the injector incorrectly and went to start it up and it broke in half, said it was pushed up against the exhaust push tube hard. Hes working on pulling the followers to check the condition of the cam and to pull the remaining lower half of the injector push tube. Any tips on getting the 1-2 cam follower out?

 

Quick update, currently tailing the driver on the way to the shop. Holy crap the carnage, exhaust and injector push tubes for cylinder 2 were in pieces with the bottom of the exhaust suspected to be in the pan. Cylinder 1 injector pushtube was bent as well, removed and replaced. I suspect that this has been the cause if the knock all along as the cylinder 2 knock us gone and cylinder 3 has an apparent knock, push tubes all around I guess. Drivers limping it home the 150ish miles and I'm pulling the followers tommorow in the PM.
Edit: Truck is in the shop with no new windows in the block or loud clanks. I've got a feeling the issue has been bent pushrods this whole time, I'll be pulling the rest tommorow to make sure as well as dropping the pan to find the missing piece.

 

Dropped the pan to see this on the number 3 injector lobe, looks like something got caught between the follower and cam. I cant see anything embedded in the cam and I dont think it's made it through the hardened layer because it isn't flaking, run it or replace it?

Carnage pics later today, forgot to take them today.

 

As promised, pictures of the bent pushtube and ensuing carnage.

This little guy spent 200 miles in the oil pan after what looks like being sheared in two by the broken injectector push tube and then wriggling it's way behind the follower. Strangely enough, the rocker end of it is literally split in two.

 

Since it's the injector lobe that's damaged, would I be looking for damage in the transition areas between the inner and outer base circles? Or would the tips be the bases of each respective circle. Its not missing any metal from what I can tell, didn't catch a nail when I tried it, rotated it a few times to get a good feel for it as well. It mostly looks like it's been polished if that makes sense, no grooves from what I can tell either. I'll try to get some pics of the follower with the inspection cam tommorow. Thank you all for your help and patience with me.