VW valve fail

[skypig]

Dear esteemed mechanically experienced ones.

A very non mechanically minded friend of mine suffered this failure while driving on a family holiday.
It's a late model VW Multivan.

I've never seen such a thing. The only reason I can imagine is a metaralurgically faulty valve.
Eg impurity in the original metal. (But I'm no expert)

Obviously the piston has suffered damage. And probably the bore.

Comments?

[Mick D]

At least that VW diesel has a valid excuse for high un-burnt emissions

[skypig]

Disappointing for a 2010 model with 122 000 kms!

Seems faulty to me. A moral warrenty claim?

[Mike52]

Different

[80-85 husky]

looks like a small star bolt has been punched through it....

[oldyzman]

Jump onto the class action against VW and sue the poofters. I guess its diesel?

[oz555ktm]

 Check    Fuel Fitter , Air Leak , Pump , Injector

  Something  has made it lean out to burn out the Valve ...

  Blocked Exhaust ??

[pokey]

To my more than weary ancient eyes that looks like mechanical rather than chemical damage. rest of the head looks normal  with no hot spots. A foreign body has entered the CC and popped that nice hole in the valve, even touched the seat a bit. Its probably sitting in the sump now. Look for missing bolts or pins in the intake.  I will sit over here with 80-85 husky and see what turns up.

or

 The VW software has kicked in as it wasnt being tested then it malfunctioned and and misread the meaning to open exhaust valve just a bit wider to let more go fast smoke out.

[chrisdespo]

had a colorada go onto three cylinders at work a few months ago. four valve heads one intake port per cylinder controlled by butterfly small screws hold them in place just like in carby screws fall out disc gets sucked into valve seat holds valve open, a little bit of a mess but no valve damage a few marks on piston where screws have passed through what was left of the screws must have passed through the turbo as well no damage there either just lucky i guess. it would be interesting to see what the valve clearance was only need a very small defect in a valve seat for a valve to burn with a tight clearance. Now if it had been an old VW 1600 or even a 1200 valve failure on them was mostly catastrophic in Qld we fitted cast iron valve guides and a big oil cooler and never had the head fall off another valve we used to do the same on the Z900 and 1000 engines we built for racing. just a thought Pokey how would anything get from the cylinder to the sump?

[Tim754]

Aliens


Do actually go along with the foreign object carried down induction theory.  Or focd it....

[Mick D]

It is quite simply just a burnt out valve.

[sleepy]

I'd say burnt valve as well. Won't be a lean out as on a diesel lean running just gives less power and lower exhaust temps.
Could be caused by a over fueling or even a valve clearance being to close.

[Mick D]

It looks text book to me and was always going to happen in the area where it did.

[shelpi]

its the inlet valve or ex ?

[fred99999au]

being smaller, I would expect inlet valve. meaning it should be well shut when a combustion event takes place.