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common likely causes of engine run away include (in no particular order)
compressor side bearing seal failure
ring failure
intake valve guide seal failure
injector failure
piston failure causing excess blowby into the crank case ventilator
wrong oil
contaminated oil
this usually doesnt cause lots of smoke from the engine bay untill the engine is destroying itself though. There are some outhere combination failures that can do it such as the fan belt flinging off and busting the air filter box and the auto cooler that then sprays oil everywhere and gets sucked into the air intake but youd have had to run over a black cat smashing mirrors under a ladder for that to happen.
smoke in the cab is usually electrical related. but a 20 foot plume would have to have come from something getting hot and my opening guess would be oil spraying onto something like the exhaust from the rockercovers as the engine tried to spin itself to pieces on over rev.
If you can get pictures of the engine bay and a detailed explination of how things progressed Im happy to have a crack at reverse engineering the failure method for you.
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For the engine to run away it has to get fuel from somewhere,either diesel or engine oil or both,4 days after a service would have me looking there.I bought the same year and model RR for the simple reason that they have prooved to be very reliable.I doubt very much it would be related to the vehicle controls as it would have gone into protection mode very quickly once the rev's picked up. Pat
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The only time I have heard of a diesel having a runaway like that is after a rollover and the engine runs on the sump oil until it destroys itself.
Like others have said, I would be questioning whether someone over-filled the sump with oil. The crank may then foam the sump oil and after an extended period of driving the foamed sump oil may be available to the engine as a fuel thus causing the run-away you describe.
Just a guesstimate though!
Diana
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Overfill would be a strong candidate. Pat
