Engine Failure AFN: Causes & Repair

Hello,
Now it has caught us too; our AFN is no longer .

The following happens:
At approximately 50 km/h, the engine suddenly cut out without any warning. It was no longer possible to start it, and there was a clicking sound coming from somewhere.
ADAC's initial assumption was that it was a ZR (a type of engine component), and he checked immediately, but found nothing; it's stuck and looks great... So, the car was towed away.

I first removed the valve cover and, sure enough, three hydraulic lifters had dissolved and their debris was scattered everywhere. So, I took the head off...
The engine wouldn't turn over to the top dead center (TDC) position; something seemed to be jammed. It would crank with the starter motor, but it wouldn't move freely when I tried to force it.
The timing belt was properly installed and tensioned, the crankshaft pulley bolt is tight, and so is the water pump pulley bolt.
After removing the cylinder head, it was evident that all the valves had made contact with the pistons, and the camshaft sprocket appeared to have spun forcefully on the camshaft (possibly due to the camshaft being blocked by a faulty hydraulic lifter? I can't imagine any other explanation).

But what do I do now?
Would it be too bold to simply create a completely new head from scratch?
Should all the pistons be replaced along with the connecting rods and bearings?

Here are a few pictures to illustrate .

Sure, no problem! Here's the translation:

"Thank you very much in advance!"
Phil.

The pistons in the picture look alright. Are the remaining ones also free of cracks, and do they all have the same piston protrusion? If so, a new cylinder head with new valves and camshafts should get it running again.

Even after a crack in the cylinder head, some pistons can still function relatively well.
Often, the cost of a completely new replacement engine exceeds the market value of the car.

Quote:

Even after a crack in the cylinder head, some pistons can still function relatively well.

I agree with that as well.

I'm a little concerned about the pistons and their potential for age-related degradation (crack formation).

Only God knows how long they will last before a crack appears.

It might be worth considering this around 250,000 km.

Hello,
Thank you for your answers .
The engine has 295,000 km on it. What are "Schwundrisse"?

Otherwise, all the pistons look equally "good"... no cracks are visible.
I will measure the piston protrusion again tomorrow.

Thank you.
Phil.

That's always the way.

They fail unexpectedly, usually on the highway after a period of heavy use.

Check under the search term "piston crack".

and here: https://community.dieselschrauber.org/en/viewtopic.php?t=14778&highlight=schwundrisse

The outcome also depends heavily on the driving profile. Vehicles that are constantly...

ans Leistungslimit gequält werden, trifft es ab ca. 200.000km. Andere später. PForecast impossible.

I think a good used cylinder head would be the maximum amount I'd personally be willing to invest in that old engine.

Hello,
For those who are interested.
I installed a different used engine with 110,000 km (approximately 68,000 miles), along with the turbo and ESP system.

It's been running perfectly since the beginning of the year!
Passed the HU and AU tests without any deficiencies on the first attempt .

Thank you for your help!!