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[JamesV6CDX]

[Viral_Jim]

Yup, that's broken alright 

[Broomies Mate]

I expect Terry has some locktite to fix that.

[henryd]

The scoring looks like alloy transfer from the piston,bit of emery cloth will make sure

[Doctor Gollum]

Possibly, but isn't the piston supposed to be the same shape as the cylinder... 

[henryd]

Possibly, but isn't the piston supposed to be the same shape as the cylinder... 

Probably was once ,f the alloy has been peened by the bit of glowplug it could have caused rubbing on cylinder wall,time will tell

[Doctor Gollum]

Zoom in and have another look 

[Andy B]

I'm still trying to work out the photo  What's the round bit in the middle of the piston? And is the scoring at about the 10 o'clock position? 

[Andy B]

Zoom in and have another look 

I think I've sussed it ..... 

James .... send the piston up & take another photo 

[STEMO]

I'm still trying to work out the photo  What's the round bit in the middle of the piston? And is the scoring at about the 10 o'clock position? 

It's an extra special, super duper, superior diesel piston. Much better than your common or garden petrol one. 

[Doctor Gollum]

Casting to clear the injector nozzle/swirl pot.

Piston damage is around 6 o'clock clearly... chunks out of it

[Andy B]

I'm still trying to work out the photo  What's the round bit in the middle of the piston? And is the scoring at about the 10 o'clock position? 

It's an extra special, super duper, superior diesel piston. Much better than your common or garden petrol one. 

Petrol engines at our house outnumber my diseasal by at least 4 to 1 

[Doctor Gollum]

Currently 50/50 here, all pretty evenly matched in capacity and cylinder number... The 330d is a bit quicker though

[Andy B]

Casting to clear the injector nozzle/swirl pot.

Piston damage is around 6 o'clock clearly... chunks out of it

Obviously not  If there's a chunk missing at the bottom, then it's also buggered up at around 1 or 2 o'clock ..... we need a better picture 

[Doctor Gollum]

There's a clear chip to the left of the lower valve recess (as you look at it).

The reflection from the cylinder wall is uniform apart from a definite chip or three. The debris on the top side of the picture is masking potential damage there, but the reflected gap closes rather than opening.