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Home🌌Off TopicsOff Topics Main Discussion › youtube surfing- Runaway Diesels :D
11-10-2012 10:49 PM  7 years ago
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helidevil

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Brunswick, ME

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youtube surfing- Runaway Diesels :D
sometime i go on random video sprees, this time i clicked upon these.

What can UPS do for you?

Watch at YouTube

Watch at YouTube

Watch at YouTube

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11-11-2012 03:09 AM  7 years ago
Tbird

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Indiana

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guy in the 3rd video is lucky he still has his fingers.... turbo's can spin over 100k
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11-11-2012 05:18 AM  7 years ago
Volcano

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chicago

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Those ups truck are throttle by wire. Ive had them fail multiple times where it would not work and youd give it gas and it wouldnt go. When that happened id toggle the ignition on/off and the pedal would reset. The mechanics would replace the pedal because thats where the bad electronics were.
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11-11-2012 03:18 PM  7 years ago
nitrojunkie

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N.C

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Throttle by wire..Technology at your service.As for the guy in the third video other than not having the a screen over an open spooling turbo I would rather be working with him or the older guy in the second video that knew what to do.I love the smell of nitro in the morning..
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11-11-2012 04:12 PM  7 years ago
JasonJ

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North Idaho

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In the Army We use to remove the engine/trans out of the m2a2 Bradleys and run them on the ground during service. We kept a good solid clipboard handy to put over the turbo inlet to stop runaways. It didn't happen very often at all but I remember a few. Nothing like being on the other side of the motorpool and hearing the ungodly sound of a 900 cubic inch unmuffled turbodiesel wide open.
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11-11-2012 06:14 PM  7 years ago
ExtremeAerosports

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Fishers, IN

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Jason, same with the M-113 series FOV, running in the hull, if it ran away, just rip off the air filter snorkle tube and cover it with a clip board. Had one guy throw a rag in and the roots blower chewed it self up. Nasty @$$ chewing after that one.Jonathan Ott
Fishers, IN
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11-11-2012 06:26 PM  7 years ago
helidevil

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Brunswick, ME

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sketchy stuff for sure! the third guy is a quick thinker
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11-11-2012 10:59 PM  7 years ago
nitrojunkie

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N.C

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Third guy at the very least is in for a complete tear down just to get all the strings out.I was going to suggest if you do that on a regular basis or run the risk of it. Take a 6 inch DA pad with a handle threaded on its mount to use to seal off the air source.Way better than cutting the fuel and leaning it out, or make a quick disconnect device for the ignition anything to keep from leaning her out.I love the smell of nitro in the morning..
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11-11-2012 11:26 PM  7 years ago
Volcano

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chicago

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what are the physics of a diesel overrun? does a diesel have a throttle that can be shutoff, how does it keep going?
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11-11-2012 11:44 PM  7 years ago
zozie

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Mississauga, Ontario, Canada

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Well well that's just the thing with diesels. They don't run away on fuel, but rather on their own oil. If the rings are worn, oil will sweep up into the combustion chamber between the cylinder wall and the piston, then it gets ignited. Since there is no butterfly valve, it's hard to kill it off by closing the air intake on an engine that's all put together. I had a runaway on an 84 300TD Benz, but luckily it was in pieces so I managed to block the air intake. In my case it wasn't the rings, but blown turbo seals so it was sucking oil in with the air.No honey I got that used.... MAAC#73745
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11-12-2012 12:09 AM  7 years ago
freakyreef

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Kansas\Colorado border

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It can also be caused by outside fuels being pulled into the engine. For example, trencher that hits a gas line can runaway by pulling the nat. gas in.Walk on water long enough, eventually you will get your feet wet.
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11-12-2012 12:48 AM  7 years ago
SSN Pru

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Taxachusetts

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Stuck fuel racks controlling fuel delivery can cause it tooStupidity can be cured. Ignorance is for life!
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11-12-2012 03:51 PM  7 years ago
JasonJ

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North Idaho

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Hey Jonathon, I was thinking M113 when I saw that last vid, since they used that family of engine. I liked the M113a3, it was a little hotrod. They got rid of the handles and put in a proper hydrostatic trans with yoke steering and foot brake. That little bastard outran the m1a1's and the Bradleys. Brakes were brutal, you could damn near spit the TC out his hatch.
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11-12-2012 07:31 PM  7 years ago
Kiba

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CA

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The old Detroit diesel marine versions had emergency remote actuated intake flappers so you could kill a runaway engine from the bridge; flip a switch and a flapper shuts off the intake and shuts the engine down.

The drawback was every time you used the flapper for a shutdown (testing, etc) the sudden vacuum shock stressed the supercharger seals and caused them to leak oil prematurely. Once the supercharger seals leak enough to keep the idle high or make it such that you couldn't shut down the engine with only the fuel shutoff (because it's idling off the oil leak) and you need to use the intake cut flappers you had better rebuild the superchargers ASAP or you're asking for a full-on runaway in the very near future!

What I find humorous is that a part designed to stop a runway will actually hasten the time until a runaway occurs if you use it enough.

I have seen a little 4V71 Detroit diesel powering a generator runaway in person. It didn't want to start and the idiot working on it used way too much ether. The sounds it made were amazing and terrifying at the same time-- until it spit a rod out and the noises stopped.

I've also heard an 8V92 start to runaway across a shop; by the time I got there it had been shut down by a piece of 1/8" sheetmetal across the intake. Improper setting of the fuel rack was the cause of that one. Again, amazing sound, if only for a couple seconds...
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11-15-2012 01:54 AM  7 years ago
Isaac F

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Panama Republic of Panama

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guy in the 3rd video is lucky he still has his fingers.... turbo's can spin over 100k
I think he damage the turbo impeller doing that.

What you think?

Isaac
Speed of light is greater than speed of sound. Some people seem very bright until U hear them speak
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12-02-2012 12:53 PM  7 years ago
hootowl

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Garnet Valley, Pa.

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With respect to pickuptruck diesels. Most common cause is bad turbo seals leaking oil. Turbos have a pressurized oil feed for the bearings. If something breaks and allows oil to flow freely, you will start running on pressurized engine oil till the motor blows up from over speed or lack of oil. Another thing that could cause a mild runaway is aftermarket oil soaked air filters. People have been known to clean them in solvent and not allow the solvent to dry off. They then oil up the filter and install. Start it up and she takes off until all the fumes are consumed.Wolves don't lose sleep over the opinions of sheep
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12-02-2012 03:17 PM  7 years ago
motorhead540

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eaglecreek,oregon - USA

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Long time ago in our body shop they had a 12v believe it was a 71 series in a gmc brigadeer run away one of the guys tried a phone book it just sucked it in and blew confetti out of the exhaust it was finally shut down with a clip board but it was pulled so hard when it was flopped onto the turbo inlet it was split almost into also seen a cat 3406 run away on startup after having governor work ran way up probably close to 4000 rpm before the mechanic was able to get the fuel lines were all loosened so it ran out of fuelwife says if i'm going to be an addict at least its to a heli
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