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Diesel Engine Runaways!
wiplash
Member Posts: 7,145 ✭✭
https://www.youtube.com/watch?v=LdI4U1uvaREThere is no such thing as Liberal Men, only Liberal Women with Penises.'
Comments
From the standpoint of potentially large chunks of iron being tossed randomly around the vehicle in question, I'd probably keep my distance. This especially being the case when ready access to the intake is not available.
Since a runaway condition indicates unregulated fueling, then the intake is the only object that matters. Air must either be cut off or inert gas such as CO2 introduced.
So it's a question of safety, availability to deny air, and the ability to get to the intake. Me? I think I'd put some distance between myself and the runaway. Diesel pieces and parts are heavy. When the engine goes bang a bit of distance is a good thing.
I have saw one run away. Have saw a couple stop and start running in reverse. Normally shutting off the key will stop one running in reverse tho.
Fire extinguisher into air filter will clog element, deprive of air.
An interesting question! Usually a runaway condition is the result of an engine eating its own oil. Perhaps the most common means of this is a failed turbo seal allowing engine oil to be introduced into the intake. Obviously anything that allows oil into the intake will result in a runaway.
Then the less obvious. A broken a/c line allowing oil from that system to reach the intake will cause a runaway. Truth be told any mist of oil introduced into the intake has a runaway potential.
The only way to stop such a situation is to deny either fuel or air to the engine. It is, however, self limiting.
The engine will:
1. Come apart (sometimes violently).
2. Eat up its crankcase oil, then seize.
3. Run out of the excess oil intake and sometimes live.
And this is why many diesels have an intake shutter valve. It closes during shutdown and deprives the engine of air.
All the GM -71 series diesels we had on the secret research ship (3-71s, 4-71s, and 8V-71s) had a shutdown flap built into the intake manifolds!!!
Just wait till you hit that flap and the seals are sucked out of the Blower and the flap is sucked in. Engine will feed on the oil from the engine.
Best thing to do when that Happens run. Make sure it is to the front or rear of the engine never to the side cause that's where the pieces go.
Trust me all the Marine Corps Generators had them in it and most of our heavy equipment.
We would always keep a large clipboard close to throw over the intake. Have seen several old Cummins do it, and the mechanics who did the job never thought to actually use the clipboard.
Had a hole sucked out of a clipboard. Kept right on going. Old Detroits.
quote:Originally posted by randomnut
We would always keep a large clipboard close to throw over the intake. Have seen several old Cummins do it, and the mechanics who did the job never thought to actually use the clipboard.
Had a hole sucked out of a clipboard. Kept right on going. Old Detroits.
https://www.youtube.com/watch?v=3NRaqgab0_w
Shut the fuel off
Ha, saw a county road grader hit a gas main once, weren't no shutting that fuel off!
Shut the fuel off
Ha, saw a road grader chew up a gas main once, weren't no shutting that fuel off!
Shut the fuel off
When the seals get sucked out of the blower it runs off the oil in the engine. Which is just enough to have pieces fly.
quote:Originally posted by grumpygy
quote:Originally posted by randomnut
We would always keep a large clipboard close to throw over the intake. Have seen several old Cummins do it, and the mechanics who did the job never thought to actually use the clipboard.
Had a hole sucked out of a clipboard. Kept right on going. Old Detroits.
Turbo not blown and RPMS did not really get up there.
https://www.youtube.com/watch?v=3NRaqgab0_w
quote:Originally posted by wiplash
What would you do to shut it down?
quote:Originally posted by HandLoad
All the GM -71 series diesels we had on the secret research ship (3-71s, 4-71s, and 8V-71s) had a shutdown flap built into the intake manifolds!!!
On I-10, heading in to L.A., pulling over the Kellogg rise, that itty-bitty Diesel ranaway, putting out the blackest smokescreen!
And fiery auto crashes
Some will die in hot pursuit
While sifting through my ashes
Some will fall in love with life
And drink it from a fountain
That is pouring like an avalanche
Coming down the mountain
We would always keep a large clipboard close to throw over the intake. Have seen several old Cummins do it, and the mechanics who did the job never thought to actually use the clipboard.
That's what we did in the Army
Diesels have no choke... In theory anyway. Diesels are fuel controlled while gassers are intake (air) controlled.
Hmm the one on my BIL's tractor does.
And fiery auto crashes
Some will die in hot pursuit
While sifting through my ashes
Some will fall in love with life
And drink it from a fountain
That is pouring like an avalanche
Coming down the mountain
In theory the last thing a diesel needs is a restricted intake via any sort of choke. In practice a "ASV" may be used to help control emissions. I suspect the tractor has some sort of this arrangement.
I have never seen a diesel run backwards before but I had a 2 stroke motorcycle do that one time on a long hill climb. My bike died and started to slide backwards. I was on the front brake but my feet were down to keep it stable so I let out the clutch and lo and behold the engine started so I revved it up, dnd the bike took off backwards; downhill with me flying over the handlebars. I had no idea what happened. I thought I really messed something up so I took it to the mechanic and he said yeah, that happens sometimes when things happen just so. We tried on several other occasions to make it happen intentionally but never could.