What caused this??

[Stock]

[Muz]

Looks like the skirt on the exhaust valve has started to break up, leaving bits to get mashed in the cylinder, then the inlet valve stem has finally broken .. what type of engine is it ? etc more info would be good, it must have been running pretty rough, but its surprising how quick the damage can mount up.

[Stock]

No Muz she was preforming like the proverbial Kitten when it went bang! rattle cloud of smoke then ran a little rough with a miss or what we thought was a miss when we opened the injector .......................

[Wazza]

Uneven spray pattern from a faulty injector nozzle,incorrect fuel delivery timing ,faulty injector pump?....... Ok what ????????

[Stock]

T'udder side.....................

[Muz]

Aye .. Ive seen a faulty spray pattern burn a hole in the piston right enough ... kinda hard to see whats what with that one stock .. looks well melted though .. did anyone tell ya its fooked by the way

[ianoz]

Langer roveriitess??? . Water geting into the Cyl via leaking headgasket ?

[Stock]

No Ian...................

[Dan]

Somethin Muz said to me earlier .... someone been at the biofuel again ?

[Wazza]

Hey Stock have you seen this PDF with nice diagrams and pictures?... http://www.boosttown.com/engine/piston_damage.pdf

[Stock]

Thanks Wazz some good info there.......................

[Muz]

Did you get to the bottom of it then ?

[ianoz]

I had been wondering the same thing myself Muz .

[Stock]

No gentle men we didn't but we were able to buy an engine with a sheared crankshaft, the pulley was loose resulting in the front of the shaft shearing off so we took the shaft from ours put in a new set of bearings and an oil pump and its back pumping water again.....................