6.2 symptom confirmation

As the title states I'm looking for confirmation or direction towards the issue in this diesel put of a truck I just bought. It's an 88 k30, 660 code 6.2 diesel non-egr. The truck has 70k on it and as far as I or the previous owner know it's the original engine. They sold it because it started missing/shaking badly and emitting a blue smoke from the exhaust. Before that it was used off-road as a service truck so I doubt it lived a very rough life, and based on how clean the truck is I'm guessing it was regularly maintinenced. I pulled the heads since I thought it to be headgaskets, as it was pressurizing the cooling system pretty good after running for only 2 minutes or so. However there's no signs of fluids mixing. I pulled the heads to look inside, and there's no seeable damage. I plan on studding this motor and adding a turbo when it goes back together so the heads we're getting pulled no matter what. The heads have no seeable cracks between the valves either. I did some research and it seems these symptoms are signs of a failing IP or bad injector. Before I rip the pull off and drive 30 minutes to the nearest reputable shop to have it all tested I wanted to ask and see if there's any other possibilities. I noticed some pistons have yellow deposits/buildups on them as well, is that a sign of coolant or something else? I haven't been in here in a while so I'm I'm the process of figuring out how to post pics, I'll post up what I have when I figure it out

Also as can be seen, the front cylinders in each side look kinda shiny, almost fuel washed, so I'm not quite sure what's going on here, the other 6 have spot deposits and/or that yellow stuff in them. Some minor scratches in one or two cylinders but other than that everything looks great

I wonder if the yellow stuff is from off-road higher sulfer content fuel (#2)?

I've never seen that kind of deposits from sulfur in fuel. And there hasn't been sulfur at those levels in diesel fuel since 1994.

My guess would be coolant. Can you get the heads pressure tested?

While you have them out find a fuel injection shop to test the injectors. Should cost little or nothing to test. If you can't find someone, put them in a box and ship them to Nueva York and I'll check them for you.

I was thinking #2 heating oil.

#2 still has to adhere to lower sulfur levels doesent it? I've never seen coolant leave deposits like that though. There's a reputable fuel system shop over in New Haven that I was planning on going to, been there a few times now and they do excellent work. Just wanted a second opinion before I pull my pump and injectors and drive all the way to one of the dirtiest parts of CT. Quick little side question though, will these stick injectors clear a 6.5 turbo manifold? If they're gonna be too tight with the turbo setup then I'll just order a set of 6.5 injectors and be done with it

It's not that it had to adhere to those standards. At least not until recently. But the refineries produce the same base stock across the board. The difference between automotive fuel and heating oil is in the handling and the additives.

Is there any chance the engine ingested something? Was sabotaged, someone put something in the fuel, etc.? I agree that doesn't look like coolant.

I have no idea about the injector's length and the manifold. They shouldn't be that much different, although the injector angle in the heads is different between the earlier engines and the later ones. I guess you're only going to know when you test fit a manifold.

I'm not sure of anything got put in it like that, I don't really see why it would be, this came from a quarry of some type and never really left the property, I'm planning on pulling injectors today and seeing when the shops open

Uhhh, is a quarry an extremely dusty location?

Did you do a compression test on this engine by any chance?

I haven't yet, I got a little over excited to tear it down and may or may not have forgotten to do a comp check first. None of the cylinders look scored badly, minot scuffing in one or two but it's mostly just seeable, can't feel them with a finger or anything. I think what I'm going to do is order studs and new gaskets and get the heads back on and test it. The shop is closed until Monday so I'll have to wait till then to have them tested.

Scoring doesn't necessarily come with the territory. Fine dust will just wear things away like a polish.

Definitely test it before you invest any more in it. I would even consider re-using the head bolts for the compression check. No need to angle torque them. Just get them close to 100 lb/ft . You're not going to run it to do a compression test.

What kind of quarry was it?

I have no idea what it was really, it was a construction company but this was their pit truck according to the id tags, and they said it was never really used on road. Also, while I was cleaning the heads earlier, some coolant dumped out, and this is what it looked like. Appears to be brass bits maybe?

Some kind of stop-leak? Results of mixing different coolant types? Material from the radiator? Maybe from an electrolysis problem? Maybe the same stuff that's on the pistons?

No idea really, just throwing out some guesses.

It seems to have come mostly from the head, I didn't really see any of this when I drained the radiator. It being what's on the pistons could definitely coincide with a bad headgasket. No clue why there's be so much of it, maybe bits from the previous water pump? It was replaced fairly recently.

Bar's Leak liquid copper?