NEVER PUT YOUR HAND ANYWHERE NEAR THAT INTAKE. Block it with something tough, like a plank of wood, metal sheet. Rag will get sucked in, and so will you and scratching an itch won't be an option anymore. The turbo bearings oil feed offers an unmetered supply of combustible fuel, so if the bearing seals here fail you're screwed. Even the diesel fuel cut off won't work, but flattening the engine oil feed pipe to the turbo in this scenario is another theoretical possibility if you want to be a hero. In an industrial setting a handy CO2 fire extinguisher to smother the air intake may save the day. In runaway the power output will easily wreck the clutch and transmission, so an attempt to stall the engine ain't on.
Swarfy.
Additional. Fords and Vauxhall's with carbs and engine driven mechanical fuel pumps could suffer sump oil dilution with fuel from leaky fuel pump diaphragms. I've had them running with the fuel lines to the carb and pump disconnected, happily ticking over on fuel vapour drawn up from the sump via the crankcase breather. Ford CVH motors were renowned for sludging up the valve gear when the gauze filter in the rocker cover silted up. A new rocker cover was needed, the originals being impossible to clean out with certainty.
