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When engine oil leaks past the turbo seal it can collect in the innercooler. This collected oil then can be sucked into the engine and burns as fuel. This uncontrolled oil that has now being burnt as fuel causes uncontrolled revs of the engine resulting in over rev of the engine. Since the oil is not metered by the fuel system, turning the ignition key off has no effect on stopping the engine and the engine will continue to run uncontrolled until the oil source is consumed or the engine fails. The only way to try and stop this over rev on collected oil is to cut off the air to the engine. Cloth towels, shirts or any other cloth like material placed over or into the air intake to shut off all air to the engine can work.

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Q: What causes a diesel engine to over rev and not shut off?
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