ZR-W replacement for V6 TDI engines, or "How to destroy an engine?"

Hi,

Today, I experienced yet another classic case of 'How to destroy a V6 TDI engine.'

Approximately a month ago, the ZR's water pump was replaced at some small, local garage. Yesterday, the engine failed and is now only running on 3.5 cylinders (2 have zero compression).

What had they done?
'The zero-point protection was removed and already a smile appeared... It's nice that someone marked the position of the wheels on the plastic cover with a marker, and also on the pulleys.'
Okay, the crankshaft was correct, and the pump was also right (maybe off by a millimeter). The timing on the right cylinder bank was also correct, but the left side had the camshaft slightly out of sync, about an eighth to a quarter of a rotation. But thankfully, all the markings were aligned.

Well, Wagen is going back there, and they're supposed to fix it.

(If even replacing the ZR belt doesn't work, how are you going to replace the entire cylinder head? Are you also replacing the old gaskets and screws?)

And time and again, one learns: Those who try to save money in the wrong places end up paying more in the long run!

It's probably best to use specialized tools when replacing the V6 TDI timing belt, and not something like a marker and a drill to secure the pump }.

Okay... we only do this based on markings. If the engine doesn't have any, then we'll need to create our own.

However, one should definitely avoid loosening the pulleys from the shaft.
With care and the involvement of four people, it can be done even without Volkswagen's problematic approach.

So far, there have been no problems in this regard (for the past 25 years).

CU Gremlin.