VW Sharan: Engine & Turbo Problems (1.9 TDI)

Hello -
I have a problem with a cylinder head replacement on a VW Sharan (performed by an authorized workshop ).
The turbocharger failed almost immediately (just a few kilometers after picking up the vehicle).
Are there any publications that recommend changing the oil when performing repairs on an exposed engine?
is required or at least considered necessary? (It hasn't been done - and we suspect a direct connection - a violation of hygiene regulations).
Or do we really have to believe that it's normal for not only the engine to fail at approximately 8o.oooo km, but also for the turbocharger to 'say goodbye' at the same time?!
Who knows what?
Best regards from Miodomo.

Hello,

Why was the head replaced? Are there any pictures? With valve problems, the turbocharger may also have been damaged. It might be worthwhile having an expert analyze the damage to the turbocharger. Often, this analysis can determine the cause of the problem.

Best regards,
Christian.

Hello Christian,
The cylinder head gasket was defective, and the corrosion in the cylinder head was so extensive that...
Planning was no longer possible.
I saw the head - it seemed okay... but... the turbo continued to run for a short time after that.
Repair done perfectly!
The question is: Would an oil change have been necessary? Is the omission of...?
What could be the cause of turbocharger failure?
Best regards and thank you for the quick reply.
Miodomo.

Hello,

It's hard to say. If the oil pan was properly scraped, the oil should have drained out. However, I don't think that was the sole cause. Perhaps the apprentice, who is in his first year, simply gave it too much gas to quickly build up the oil pressure due to the lack of oil caused by the empty hydraulic system. That's harmful to the turbo. There's a specific instruction from VW on how to proceed, for example, after an oil change (don't give it any gas).

Best regards,
Christian.

Hi,
Like at Toyo... nothing is impossible.
Dirt is probably not the problem, after all, there's an oil filter.
But it's possible that too much water got into the engine, or during the test drive, a poorly installed turbocharger hose might have burst, or something else entirely, or it could just be a really unfortunate coincidence.
However, without a thorough inspection of the charger and the oil (assuming it hasn't been changed), it remains speculation.

Hello and thank you for your interest.

'The turbine shaft is jammed, severely corroded, and has deep scratches. Since the turbo wasn't making any noise before, I suspect that contamination entered the turbo through the oil supply line. Otherwise, how can I explain the extent of the damage to the shaft?'

I must assume that there was contamination via the oil supply line to the turbocharger. How else can I explain the destructive pattern of the shaft?

As mentioned above, accelerating the engine to speed up the filling of the oil channels could also be a possible cause.
There are always some clueless people who absolutely have to do it (and end up with Meister's handprint on their cheek for three days).

if VAG feels it necessary to explicitly point out this circumstance in a workshop instruction... https://dweb.homeunix.org/dmirror/http/www.cheesebuerger.de/smilies/verbluefft/49.gif

'However, if there's significant material debris present, it's usually necessary to change the oil. The oil filter isn't a cure-all. If the filter becomes clogged, it will often bypass the filtering process by opening the bypass valve (or, if it doesn't have a bypass valve, it will force the debris through somewhere else). Then, all that unfiltered material will circulate throughout the system...'


CU Gremlin.