This is a 2007 Dodge Caliber 2.0 CRD (which uses a VW Golf 5 TDI engine).
The valves on only 1 piston have come into contact with the piston, causing chaos in that cylinder. The other three are fine.
The engineers who overhauled the head say that the mechanic got the timing wrong because he never used the special tool (it's just a pin with a handle) to set the timing. Actually the guy used an Allen key instead of the tool to keep the timing belt gear in place, so I can't see what difference that would make to the timing.
If it was a timing issue, surely the valves on all cylinders would be affected, wouldn't they?
Is it not more likely to be a fault on the valve itself? A spring, or a material defect, or valve seating or something like that?
Please help, Thanks, Mark,(South Africa)