159 2.4 20007 plate
19,500 DPF/EGR by
AO Silver Member
Join Date: May 2009
Location: United Kingdom
It is just a bit of smoke until a piston falls apart and a flailing conrod punches a hole through the block.
Yes all three reasons for this have been covered:-
1. Failed turbo seals - these "run-away" the fastest and I have never seen anyone react fast enough to shut one down. It doesn't help that the engine is usually up to temp when they go. I think what happens is that they are weeping when being driven. once stooped the oil pools in the turbo. Once you re-start it away it goes.
2. Oil dilution / becoming over filled with diesel due to failed injectors. These are next fastest to "run-away" but are spotted by observant owners who regularly check engine oil noting that the level is increasing. You can smell the diesel in it by sniffing the dipstick.
3. Over filled with lubricating oil. These don't usually runaway because most people top up a cold engine. They usually start and run like a *****; you then turn it off to find it doesn't stop. They don't usually "run-away" but sit there idling as lumpy as heck and banging away as they are effectively also "pinking." These aren't too scary and blocking the intake shuts them down quickly.
Worst case I ever saw of this was a V10 Deutz used as a stationary generator - that was a mess!
Last edited by kandlbarrett; 19-02-12 at 18:21.