the one i saw on scrapheap was the barleyickers lorry engine after theyed tried to adjust the injection pump...thought theyed blocked the air intake with cloth but it still threw a con rod.
 
twas that mad farmer form the barley pickers on scrap heap mega challenge I saw do it when he undid the nut on the govenor and dropped it.

it broke a load of rockers and valves I think, it was a RR eagle diesel too, sad
 
Ludachris's disco went up in smoke on the M4 a few weeks back due to ingesting oil.
 
Had an old Di Transit van do this to me a couple of years ago, the resulting smoke shut the A5 just south of Crick for about 15 minutes.

The engine seized rather than going bang though
 
My cousins Isuzu 4x4 had a run away on her. She was coming up to the traffic lights and could see lots of smoke in her mirror. She pulled over onto the side of the road and tried switching it off but nothing. just kept reving and reving until it seized.
you would have to have balls to go near the sump plug when you hear the noise coming from an engine on run away.
One night on the booze my mate had an engine knock coming from his Toyota. Knowing that getting hold of a second hand engine was no drama we put a brick on the accelerator until the engine couldn't take it any more. It went from redlining to slowing down and blowing the con rods out the block what a sight that was to see. Hence the reason i would stay well clear of an engine on run away, unless you can spare loosing a hand or arm
 

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