Is there anything that can be done to stop this happening, is it pot luck if it fails?
I've read through some of the other posts about parts from America? are these a guaranteed fix.
Off topic a bit but is it worth taking out the VW warranty to cover this sort of failure
You don't need to buy any parts from the usa
All parts are available from vw dealers or tps
The parts have the same part numbers
All that's needed is the revised tensioner, new lower camchain cover, sealer for the the cover, new bolts,
Only difference is the Americans do it as a kit.
Basically there has been a few revisions of the tensioner basically as its ratchet system that it falls back on when the car is not running is not strong enough. When its teeth fail all tension is released from the chain. The chain slip as you try and start the car as there is no tension. The tensioner then gets oil pressure, tensions up due to the presure. The engine then plays with the camshaft timing to try and keep the car running. Pistons meet valves and damage pistons bending and mashing as they go.
The revised tensioner from last year is much better. 95% of cars that ate failing are 2009 or early 2010 as there was a revision to the tensioner in the middle of 2010 due to the original one been so rubbish. VW know its an on going issue but there policy is simply to replace engines if and when they go bang how long thats the policy is a good question.
I'm going to replace mine with the revised version next year as if the car had a cambelt that would have been.changed at 4 years old anyway so the expense of fitting the new tensioner will be less than a cambelt change would have been. Plus I simy have no time this year to do it.
Until then I cross my fingers everytime I start the car and took out vw forth year warrenty.