I had unfortunate incident at a BMW dealership. Whilst sevicing My 1997
740 4.4 litre the technician accidently dropped the screw top of the
spark plug into one bore. Needless to say on start up destroyed the
head and scored the cylinder. The dealership now wants to machine the
bore and put in a metal liner.
Is this possible on a aluminium alusil engine?
I would have thought the correct thing to do would be to replace the
block or the entire engine!

Any advice would be appreciated
Cords