Hypothetical Question
Postmaster
Joined: Jun 2006
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From: Fulltime RVer
There's a lot of things to worry about in this world today, but your PSD not turning off isn't one of them. I'd like to hear about even one documented case where this has happened! I know it happens with mechanical diesels, and I used to have a similar problem with my old race car that ran a 14/1 CR, as I had to routinely put it in gear and pop the clutch to kill the engine. If you don't have a manual tranny, and you're really worried about this, just install the TC clutch lock up mod, and use it to kill your runaway PSD!
Postmaster
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If the motor is running off its own oil, how would you electrionically stop it from using its own oil? There have been runaway PSD's before but they were modified a bit more than a chip. It doesnt matter how many electronics are on it, if the motor will get oil and air it will ignite. There are only two thing needed to keep a diesel running and that is air and fuel/oil.
There are cases out there of a PSD runaway.
There are cases out there of a PSD runaway.
Last edited by John311t; May 27, 2007 at 05:26 PM.
Post Fiend
Joined: Jul 2005
Posts: 14,582
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From: 21791
When we dynoed the 3406B Caterpillars that we rebuilt at school, we used a guillotine style air intake to mount over the turbocharger intake to cut the engine if it did run away. Never had to use it but it was fun making it breathe through a straw-sized hole. I think all mechanical pumps have a lever on the pump that cuts the fuel off for normal shutdown. Puts the fuel racks in a no-fuel position. I could go on....
Senior User
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Just walk away from your runaway PSD and call the fire deptment so when it blows up and starts to burn they can put out the fire and hopefully save the rest of the truck....
just kidding iam thinking chocking off the air intake supply is the only SAFE way to shut down any runaway diesel engine..
Erik
just kidding iam thinking chocking off the air intake supply is the only SAFE way to shut down any runaway diesel engine..
Erik
Post Fiend
Joined: Jun 2006
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From: Central, Al
All of our Fire truck are now equipped with runaway solenoids
http://www.mckenziecorp.com/air_intake_valve.htm
About 15 years ago a pumper responded to a gas odor and when they arrived the pumper started revving uncontrollably, Luckily no one was injured the officer new what was happening and evacuated his men and residents but when the truck blew 3 houses were taken with it.
http://www.mckenziecorp.com/air_intake_valve.htm
About 15 years ago a pumper responded to a gas odor and when they arrived the pumper started revving uncontrollably, Luckily no one was injured the officer new what was happening and evacuated his men and residents but when the truck blew 3 houses were taken with it.
Senior User
Joined: Sep 2004
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Originally Posted by amiller93
All of our Fire truck are now equipped with runaway solenoids
http://www.mckenziecorp.com/air_intake_valve.htm
About 15 years ago a pumper responded to a gas odor and when they arrived the pumper started revving uncontrollably, Luckily no one was injured the officer new what was happening and evacuated his men and residents but when the truck blew 3 houses were taken with it.
http://www.mckenziecorp.com/air_intake_valve.htm
About 15 years ago a pumper responded to a gas odor and when they arrived the pumper started revving uncontrollably, Luckily no one was injured the officer new what was happening and evacuated his men and residents but when the truck blew 3 houses were taken with it.
Erik
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Postmaster
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From: Fulltime RVer
Originally Posted by John311t
If the motor is running off its own oil, how would you electrionically stop it from using its own oil?
In any case, the best way to stop a runaway engine, weather a diesel or a gasser, is to simply put it in gear and pop the clutch or hit your TC lock up switch. I don't think any of the air cut off techniques I've read here will work, because air will still be sucked into the intake from the CCV, unless you've got a CCV mod.
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Smokin
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Originally Posted by ernesteugene
In any case, the best way to stop a runaway engine, weather a diesel or a gasser, is to simply put it in gear and pop the clutch or hit your TC lock up switch. I don't think any of the air cut off techniques I've read here will work, because air will still be sucked into the intake from the CCV, unless you've got a CCV mod.
Postmaster
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From: Fulltime RVer
Originally Posted by Smokin'
What if you have an auto, like mine, and no TC mod? What then, if you don't think the above mentioned theories would work?
Senior User
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Originally Posted by ernesteugene
Where in the heck is this much oil coming from anyway, this is starting to sound like the elusive perpetual motion machine! The only places I can think of are some broken injectors leaking oil from the HP oil galley in the head, or some veeery worn valve guides sucking a little oil that gets splashed around the top of the head or vapor from the CC, but it's hard to imagine enough oil coming from either of these places to keep the engine running, and it would be running like crap anyway which should be a clue that it needs some work.
In any case, the best way to stop a runaway engine, weather a diesel or a gasser, is to simply put it in gear and pop the clutch or hit your TC lock up switch. I don't think any of the air cut off techniques I've read here will work, because air will still be sucked into the intake from the CCV, unless you've got a CCV mod.
In any case, the best way to stop a runaway engine, weather a diesel or a gasser, is to simply put it in gear and pop the clutch or hit your TC lock up switch. I don't think any of the air cut off techniques I've read here will work, because air will still be sucked into the intake from the CCV, unless you've got a CCV mod.
But your original question was not about a runaway. It was simply how to stop a running truck that would not shut off with the key, and for that to happen on a normal running engine, several things would already have to be bypassed.
Post Fiend
Joined: Jul 2005
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From: 21791
Originally Posted by ernesteugene
My best engineering judgment based on over 45 years experience playing around with engines is that there's a much better chance a large meteor will strike the earth and wipe out all life than there is that your PSD won't turn off when you want it to.
Watch for the meteor!
Ha just kidding, i do agree, and that about sums up this hypothetical thread.
Senior User
Joined: May 2007
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Mine has a mechanical cam driven, and a Hi P oil driven pump so Id just open the fuel darin on the fuel strainer 1st. After havin been around diesels for 40 yrs now I think Id be able to stop it unless it was aV8 Detroit which could run backward on engine oil and would just blow up after while.