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Diesel runaway - do you have action plan / take precautions?

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Old Feb 16th, 2015, 02:19   #11
c_lee
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Quote:
Originally Posted by miksu View Post
I thought all modern diesels have a throttle body which is effectively an air cut off valve.
Yes - I read something similar about runaway on a more modern TDI forum earlier today.

But mine is not really a modern TDI and it doesn't have an air cut off valve, just a fuel cut off valve.

Colin
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Old Feb 18th, 2015, 13:19   #12
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Depends on your engine but for me (D5252t manual) would be stall in high gear, if that doesn't work, squash the inlet pipe as it deforms itself under high boost, wouldn't take much more to flatten it* = no air to feed it = stall


*it might even do this by itself!
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Old Feb 18th, 2015, 13:34   #13
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Originally Posted by brickman View Post
Depends on your engine but for me (D5252t manual) would be stall in high gear, if that doesn't work, squash the inlet pipe as it deforms itself under high boost, wouldn't take much more to flatten it* = no air to feed it = stall


*it might even do this by itself!
I've still not managed to deform or flatten mine even at the boost high enough to lift the head!
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Old Feb 18th, 2015, 15:42   #14
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I've been unfirtunate enough to have two over the years, both by my own making though.

The first was on my old Shogun.
I'd cleaned the intercooler with Parafin if memory serves and not cleared it out properly.
Started up fine, then with a blip of the throttle the turbo blew it through and it ran away.

Second time was after fiddling a little too much with my d24tic's fuel pump.
Started up, little rev and it ran away as it couldn't defuel.
I can categorically state that in a fuel enduced runaway, the solenoid will NOT stop fuel flowing!!

In both cases, I quickly whipped off the intake hose and covered the end with a plank of wood, or whatever else was around. No oxygen, no burn.

One piece of advice though:
NEVER, EVER try to cover an inlet with your hand, or any other part of you body for that matter.
The suction of 4/5/6/8 ravenous cylinders at 5/6k plus is something that should never be underestimated and could potentially pull the skin clean off and snap the bones in your hands.

I was lucky, first time I instinctively went to cover with my hand on the Shogun and it quickly grabbed hold. Luckily my thumb somehow slipped inside the inlet hose causing enough of a vacuum release to let me pull my hand off and smother the pipe via other means.


I must say though, that both engines survived. The D24 is quite a high revving diesel engine though and would rev on the throttle to over 5k.

The Shogun even gained a few hp for it's ordeal!

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Old Feb 18th, 2015, 16:04   #15
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I have installed several Co2 extinguisher systems into turbo diesel set up's . These were mainly on marine & heavy plant applications using adapted Co2 extinguishers . You remove the delivery horn & hosing , with a nozzle fitted ahead of the turbo inlet .The system was triggered by a manual cable such as http://www.demon-tweeks.co.uk/motors...dle-pull-cable . once pulled the bottle empties completely , leaving you able to deal with other matters . CO2 is best as it does not leave any residue ( like powders or foams ) is CHEAP ! ! ! ! ! ! ! and it works ! . One 9kg CO2 was enough to stop a Caterpillar C32 (32lt ) that got too excited . Modern engine running very light oils 0w-30 & the like are far easier to whip into a froth & vapour that the engine can then begin to burn along with injected fuel and once the engine is up to temperature and working at speed , the oil mist can become an unstoppable fuel supply . Also due to many modern cars being auto of some form or another , stalling is not a solution , so blanketing gas is your only hope . ALSO DO NOT attempt to restart a runaway until you have removed any source of excess fuel . Inter coolers can hold huge amounts of oil that gets airbourne once the turbo starts blowing hard . I have removed & scrapped an engine to the tune of £107,000 after it ran away . The "brave" soul using it removed the turbo inlet & jammed a large rag into the turbine , we found it wedged into the intercooler , having been throught the blower & pipework
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Old Feb 18th, 2015, 16:05   #16
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Quote:
Originally Posted by brickman View Post
Depends on your engine but for me (D5252t manual) would be stall in high gear, if that doesn't work, squash the inlet pipe as it deforms itself under high boost, wouldn't take much more to flatten it* = no air to feed it = stall


*it might even do this by itself!
Be careful as you will create a vacuum & draw in more oil that could hydraulic the engine . Definatley wrecking it
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Old Feb 23rd, 2015, 21:55   #17
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Quote:
Originally Posted by martin_r_smith View Post
I've still not managed to deform or flatten mine even at the boost high enough to lift the head!

It's because my tubes were all replaced with pattern parts (pricey enough at £180 for the set!) instead of genuine by previous so the inlet pipe deforms and the boost pipes are well soft to the touch, think oil spray on them has degraded the rubber badly. If I spot some good genuine ones they'll go on instead.
Makes a weird warbling followed by flat spot when it does do it though
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Old Mar 1st, 2015, 19:03   #18
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Quote:
Originally Posted by miksu View Post
I thought all modern diesels have a throttle body which is effectively an air cut off valve.
Exactly
For those old diesels without throtle practise on the quick reflexes

https://www.youtube.com/watch?v=3NRaqgab0_w
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Old Mar 1st, 2015, 19:20   #19
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The last thing I want to be doing is opening the bonnet and sticking my head under there in this situation, I would much prefer to keep my head attached rather than have it taken off by flying chunks of engine, in over 20 years of working in the garage trade I have only seen it once on an old ford, just slammed it in gear and stalled it.....
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Old Mar 1st, 2015, 22:17   #20
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there is video on youtube of a merc c class running away, a motor biker is filming it with his helmet cam and offers to help. the car is auto so cant be stored, he lifts the bonnet removes the air filter cover at which point it and the filter almost hit him in the face with some force!
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