Taken number 3 piston out my block today as i thought the rings had gone. Well they havent,

got this instead

Number 3 shells,


Here is number 1


Number 2,


Number 4,


The number 3 was well fooked, the metal had gathered i the sump as a small lump.

Doesnt even fit the conrod anymore.


The annoying thing is, this engine was only put together 1000 miles ago

Any ideas of the cause? Oil Pressure was fine.