Some modern diesels now have a butterfly valve in intake line, this normally used for assisting with exhaust gas recirculation, but if an over rev is detected, this valve shuts completely to starve engine of air
That's what I was hoping they'd start doing. Maybe compare the TPS (throttle position sensor) with the revs. If the TPS is at a low value, revs are high, close butterfly valve.
The butterfly valve isn't for EGR recirculation. It was introduced by Cummins in the early on road days, it was actually to help with regeneration. When you cut the intake air flow off to a diesel engine it drives cylinder temps up which increases exhaust temps to help get the regeneration process started. Positive air shut offs are similar but they are just that positive air shut offs for run away, when they snap closed they allow no air through. On oil rigs the engines have both of these together.
once its in that state just leave it. the engine is damaged beyond repair anyways from the heat damage caused unless you can stop the runaway just as it starts. not worth the injury if that thing explodes in you'r face.for a now junk block.
@@gogereaver349 it had to override the governor if the could catch in time they could close off the air filter and let it strave for air until it shuts down
@@gogereaver349you can't turn it off you know? Wdym leave the car do you wanna buy a new diesel car that was very expensive? Rather just save the car instead having your money down the freaking drain
Old cat was loving seeing them young diesel gearheads witnessing a run away for the first time! I bet layer that day he was laying there thinking of hos first time. 4:19
For anyone wondering on how to quickly stop a diesel runaway: Your best bet is to local the air intake and completely bloke it off with some type of solid surface or lots of heavy cloth in the case of a turbo. Another way to prevent your diesel from shredding itself, if you have a standard, put that baby into it's overdrive gear and dump the clutch. Better to risk your tranny then your motor and everything near it. If all else fails, you can turn off your fuel supply on some vehicles in which I would check your vehicle. As a preventative step, install a automatic / manual fuel or air supply cutoff for the fastest shutoff, which will prevent a runaway almost every time. A automatic air supply cutoff usually detects when the engine rpm becomes too high, they usually only cost $500 - 700 rather then the 3k or so for just the engine block itself let alone any other damage.
5:40 you see the guy trying the clutch dumping method and it's not working. I think the safest method would be a CO2 fire extinguisher but the chances of anyone having that ready is pretty low
@@castirondude Yes I saw his attempt, however it looked as if he was in low though as I've have my grandfather's semi run-off on me and I just put it in high 12 and released the clutch and it jolted, then stalled and the fire ended up having nowhere to go. Granted I talked about other ways to stall or smuggle the engine.
@@caneded7320 Something that has always interested me ever since I found out about diesel engine runaways is whether you could make it happen on purpose (using a worthless old car or truck from a breakers yard) on a drag strip to make the vehicle go faster than it would ever normally be capable of: The easiest type to do this with might be a turbodiesel, since it would probably be possible to fit some kind of device to deliberately make the turbocharger start leaking oil into the intake manifold. After all, one of the most common causes of diesel runaway is this happening by accident - the turbocharger oil acting as "extra fuel" for the engine. Unless you had a very large and unobstructed runoff area (like if you were doing this on the Bonneville salt flats), you would need some method of reliably shutting the engine down that you could trigger from the drivers seat - such as a big flap valve fitted to the air intake, or a carbon dioxide fire extinguisher pointing at the air intake. Anyway, what I am imagining is this: Get the car moving off the line as normal and accelerate enough to get into top gear - and at that point, activate the device which makes the turbocharger oil leak, which should then trigger the diesel runaway. Somehow I doubt that I am the first to consider this idea, but what I don't know is whether anyone has ever tried it, or whether it would actually work - as in how much faster would it make the car or truck go?
That poor little single cylinder generator was not a runaway. Those geniuses put gasoline in the fuel tank of a diesel engine. They could have saved that generator if they had immediately shut it down, cleaned the gasoline out the fuel system, and refilled it with diesel fuel. Instead, they just watched it burn up and stood there making remarks like: " The muffler is turning to plasma." and "It's brand new." That little generator would have been a clean, reliable, source of electricity with excellent fuel economy if those guys had just put the correct fuel in it.
@@ThatOneGuyWithTheEye Lower compression with a fuel air mixture ignited by a spark vs high compression air that creates high temperature heat with a squirt of fuel both methods will ignite gasoline for gasoline very volatile.
@@ThatOneGuyWithTheEye 'sacly. The claim that you can run a diesel engine on petrol is complete bogus. Back in the days, some petrol was mixed into diesel for keeping the gunk fluid at very low temperatures, but there still the diesel started the controlled combustion.
Pretty sure that's not possible. There are no spark plugs in a diesel engine, since the combustion of diesel relies on high pressure instead of a spark (the main reason that runaways occur in the first place). Gasoline needs that spark in order to ignite. So putting gasoline in a diesel engine will cause it to just.....not run at all. Even if you started the engine with diesel and then poured gasoline in, it would eventually just shut off.
Standard starting procedure when I was a kid on the farm in winter. A squirt of WD40 into the air intake while the engine is turning over always gives the battery a chance to get it going.
I had a dodge truck turbo went bad i had no idea it would do that it ran away on me it had to rev up to 6 or 7 thousand rpms for like 5 mins till it trowed rods cam was on the ground under the truck it broke the trans in haft long ways crazyest shit ive ever seen that was 25 years ago i will never forget it !!
@@ludicrous7044 yeah sadly i figured the torque would drop some as your surely losing compression. but the sheer amount of rpms some of these turn compared to their normal rpm range. it would see the diff in number between healthy and 12k rpms. im almost willing to bet for a brief while the hp does increase. mainly just do to rpms. pry look like most 4 cylinder dynos. high hp and almost no torque.
@@chehystpewpur4754 the heat damage from those insane rpms melt the pistons down. its why any attempts to save one in full runaway it just a wast of time.
@@chehystpewpur4754 no I'm not unless you stop it as it starts the motor is trash. So running around trying to stop it where It can blow up anytime is not worth it
probably not. usually their pretty severely damaged. most runaways suck the oil from the crankcase and burn that and that means no lubrication. sometimes you get lucky but its not worth the risk to me. just like when an engine over heats and the block or heads can warp this can do the same thing from the heat and being well above the rpm range the engine should run at.
If the engine is still in good condition, here's a trick to fix this. Sometimes it doesn't work, but if you have a rag and a jug of diesel fuel, dampen the rag with the fuel and put it into the air intake, it will fire right up. And before you do all that, try to fix what caused it to runaway.
It really depends on the lifetime of the engine and the build quality. Regardless a couple of seconds higher than the rev limiter isn't going to cook the engine, but I'd say anything more than 10 seconds and it's gone. The bearings will be shot, all the fluids are cooked, the rings will be damaged and the connecting rods if they haven't broken yet are now damaged and weakened. Plus the valve train will be broken too.
He really couldn’t tell something was wrong with that generator? It’s turning the muffler into plasma that’s a fire hazard like it was a damn feature of the unit my lord
Forgive my lack of knowledge on diesel engines and thus my possibly dumb question: Can diesel engines have an emergency air flap that would seal off the intake in case of a runaway? It would have sort of a 'break glass in emergency' switch. I'm guessing that at very least, it might be unnecessary in most cases?
Easiest way to shut down a runaway is clog the intake pipe with a towel or a shirt something along those lines. Make sure you hold on to it!🤦 Starve the cylinders for air the pressure will drop thus in turn will stop the diesel from igniting. Used to know an guy who had an old Ford tractor, it would always start but would never shut off. He would just pop the air cleaner and covered the intake pipe with his hand until the engine stopped running.😅
Except if it's something like valve guides, I choked the intake on one acting odd because it was taking like 30 seconds to shut down from an idle speed. And it revved back up. After it shut off, I disabled it. Definitely a runaway waiting to happen. And no it wasn't the turbo because it was NA
Unfortunately with runaway diesels you only have 2 options.1 get close and stop it from taking air or stand let it run till it blows. There is a third option of setting the brakes and putting it in gear but results differ. If you take option one make sure to use something solid,NEVER use your hand
Some of the old Detroit 2 cycle diesels had an emergency shutdown flapper that would cut off the air to the engine. Those usually worked pretty well. Some of the old N series Cummins engines had a compression release that would hold the intake valves open. Those would instantly kill a runaway engine. Old time diesel mechanics would sometimes have a carbon dioxide fire extinguisher ready to spray into to the air intake of a runaway engine. That also was a very effective way of starving a runaway engine for air.
none of them are worth the risk if the runaway isn't stopped before it starts. because even if you stop it when you tare it down everything inside will be melted due to heat. at the end of the day you are buying a new motor no matter what.
the one at 5:40 tries that, putting it in gear with breaks on, didnt work for him, and i think he blew either gearbox or drive shaft with how that chassie and frame twisted and buckled lol.
Oil leak at the turbo is the most common cause for this. It's my biggest fear with my Duramax. And it's not common, so I'm not worried about a lot… :-)
@@castirondude I had a scary situation that actually could have resulted in a runaway. I had a fuel leak at the high-pressure end, just before the injectors, and diesel fuel was spraying all over the inside of my engine compartment. I couldn't see anything, I could just smell diesel really strong. When I looked in the rearview mirror, I saw a huge, cloudy mist of diesel fuel trailing behind me. It was so bad, cars were slowing down. I was able to get it home, but if it was a gasoline engine, it would have erupted into a giant fireball.
I'm not well versed in Diesels, the last one I had was a 5 year old 1980 VW Rabbit, BUT would it do any good to put in a fuel line cut off? Just wondering
you see this alot more in turbo diesel not the old na diesel. turbo seal fails in a way allowing oil to flow into the cylinders and runaway. other things can cause it like blown shaft seals.
Runaway diesel happens common for one or 2 reasons The engine runs on its own hot black sooty blood called used engine oil from a bad turbo or bad head gasket If a turbo goes, the high pressure oil that lubicates the turbo bearings (and what ever sort of seal or clearence that keeps oil in there only) the bearing/seal fails oil gets pushed into the input turbine and gets atomized, sucked in and burnt The other possible way is an engine with overhead lubrication and the head gasket that seals the head to the block leaks oil into one or more cyclinders and starts running on engine oil
It would be nice to have a CO2 tank to flood into the engine to quench the combustion, in addition to a sliding "gate" type intake air shutoff. Maybe you save the engine, maybe you don't, but you get it stopped quickly so your chances are better, and you minimize the heat build up that could cause a fire and burn the whole rig to the ground. Obviously, those things aren't common because this problem isn't all that common, either. But with what a good tractor costs these days, I wonder if you couldn't get a break in your insurance having systems like that installed.
Because the Jake Brake releases engine compression, it should vent all the combustion gas into the exhaust, which would prevent it from adding RPM to the crank, but would spool up the Turbo, unless there's also a wastegate open to bypass it.
The only bad idea is to spray starting fluid on a diesel engine, because the fluid can enter the fuel intake, thus mixing it with the fluid. That is a straight up bad for the entire engine.
Either I’m misunderstanding you, or you know absolutely nothing. Do you mean on or in the engine? And diesel usually has high pressure fuel, not negative. The real issue with starting fluid is that it will practically melt the inside of a diesel
Whether you understand the mechanism of a runaway diesel engine or not, there is just one rule to follow: "When restoring an old diesel engine, always prepare a plug with the same inside diameter as the intake pipe." And before you try to start it for the first time, practice jumping out of the driver's seat and quickly inserting the plug into the intake pipe. Make an effort to understand, as much as possible, the mechanism of a runaway diesel engine. A quick online search will surely reveal some explanation. Understanding the mechanism of runaway will help you understand what you must check when restoring an old diesel engine. These include serious oil leaks into the cylinders due to a broken head gasket, a faulty valve stem seal, abnormal wear of the valve guide, or a faulty turbocharger bearing seal. And oil spraying from the crankcase breather due to an incorrect oil level or broken piston rings. In short, a diesel engine will never runaway unless engine oil mist is continually sucked into the intake. Understanding these things will also help you to "properly fear" the phenomenon of diesel engine runaway.
One solution not requiring tools would be to get a few litres of water in the diesel tank and pump will pick that up instead of the diesel as water is heavier. I wouldnt want to be trying to work near the engine trying to stop the air or the fuel feed to the high pressure pump.
@@dougclarey3241 Diesel engines inject the fuel via injectors squirting minute amounts, when the water enters the system and is squirted in there would be no combustion. Your thinking of what happens to diesel or petrol engines suck water instead of air. I once had a petrol engine runaway and the noise is frightening, I'd rather be away at the diesel tank than at the inlet manifold when the engine explodes.
Most of the time a fuel shut off won't work diesel engines can run on the motor oil in the crank case. You need a air shut off to choke them off no air can't run. Thke the air canister or breather off so you can get to the intake manifold and use something that is solid enough to cut off the air, by putting it over the air intake on the manifold.
1.Yes they do, in fact it's the only way to turn off a diesel 2.Most runaways are caused by oil leaking into the combustion chamber, so cutting off the fuel (aka turning it off, see no.1) is useless
That probably would not help. Most of the time those runaway diesels are burning the lubricating oil from the crankcase. Cutting off the fuel will not help. The most common cause of a modern diesel running away is a bad turbocharger seal leaking lube oil into the intake manifold. The old Detroit Diesel engines would often run away if the fuel racks in the injectors were stuck open. In that case, yes, cutting of the fuel would stop the engine.
@@KronosOpie Diesel engines only use glow plugs as a starting aid in cold weather. Once the engine is running, the glow plugs are turned off and not in use. In a runaway situation the engine is already hot and burning its lubricating oil. So, the glow plugs, if the engine has them, are completely irrelevant.
Engaging a high gear and flipping the clutch with brakes on (10:02 min.) to stall a runaway diesel is no smart move. Clutch, gearbox and drivetrain possibly get killed as well while the engine in most cases is toast anyway.
I don't know why people don't just stall their manuel diesel engines, like all those big trucks are surely not running an automatic transmission, so why not just put the park brake on in 4th gear foot on the brakes and let out the clutch fairly quickly 😅
How to shut off a runaway diesel should be required knowledge before being allowed to operate one. Also ALL diesels should be required to have a valve in the air path that can be closed to shut off the air and those without one should be required to have one installed.
The flames out of the stacks is impressive !
Awsome
Some modern diesels now have a butterfly valve in intake line, this normally used for assisting with exhaust gas recirculation, but if an over rev is detected, this valve shuts completely to starve engine of air
That's what I was hoping they'd start doing. Maybe compare the TPS (throttle position sensor) with the revs. If the TPS is at a low value, revs are high, close butterfly valve.
Also is used as a anti shudder valve, since restricts engine of air when shut down it stops spinning faster than it would without the valve
The butterfly valve isn't for EGR recirculation. It was introduced by Cummins in the early on road days, it was actually to help with regeneration. When you cut the intake air flow off to a diesel engine it drives cylinder temps up which increases exhaust temps to help get the regeneration process started. Positive air shut offs are similar but they are just that positive air shut offs for run away, when they snap closed they allow no air through. On oil rigs the engines have both of these together.
Pickup truck at 4:14 went from stubborn to crazy like a detroit 2 stroke
Its actually quite scary how many diesel owners have no clue about diesel engines.
once its in that state just leave it. the engine is damaged beyond repair anyways from the heat damage caused unless you can stop the runaway just as it starts. not worth the injury if that thing explodes in you'r face.for a now junk block.
I know a lot of them one put gasoline in the trick by accident he blew the engine up quick I seen this with my own eyes engine cost him about 15,000
@@gogereaver349 it had to override the governor if the could catch in time they could close off the air filter and let it strave for air until it shuts down
The engine is named after its creators, Shaq and Vin.
@@gogereaver349you can't turn it off you know? Wdym leave the car do you wanna buy a new diesel car that was very expensive? Rather just save the car instead having your money down the freaking drain
I love how Grandpa just stays calm and carries on while the Detroit runs away looking for something to stop the air
8:27: that truck went straight into supercar territory
nope the sheer heat damage melts the entire thing internally its all rpm pretty much no torq.
The semi truck with flames remind me of something that straight out of mad max
Old cat was loving seeing them young diesel gearheads witnessing a run away for the first time! I bet layer that day he was laying there thinking of hos first time. 4:19
For anyone wondering on how to quickly stop a diesel runaway: Your best bet is to local the air intake and completely bloke it off with some type of solid surface or lots of heavy cloth in the case of a turbo. Another way to prevent your diesel from shredding itself, if you have a standard, put that baby into it's overdrive gear and dump the clutch. Better to risk your tranny then your motor and everything near it. If all else fails, you can turn off your fuel supply on some vehicles in which I would check your vehicle. As a preventative step, install a automatic / manual fuel or air supply cutoff for the fastest shutoff, which will prevent a runaway almost every time. A automatic air supply cutoff usually detects when the engine rpm becomes too high, they usually only cost $500 - 700 rather then the 3k or so for just the engine block itself let alone any other damage.
turning off fuel does nothing. Normally it's burning over filled crank case oil, or turbo oil which is leaking into the intake.
@@N4CR Turning off the fuel can help in case of the Detroits getting the injector fuel lever stuck.
5:40 you see the guy trying the clutch dumping method and it's not working. I think the safest method would be a CO2 fire extinguisher but the chances of anyone having that ready is pretty low
@@castirondude Yes I saw his attempt, however it looked as if he was in low though as I've have my grandfather's semi run-off on me and I just put it in high 12 and released the clutch and it jolted, then stalled and the fire ended up having nowhere to go. Granted I talked about other ways to stall or smuggle the engine.
@@caneded7320 Something that has always interested me ever since I found out about diesel engine runaways is whether you could make it happen on purpose (using a worthless old car or truck from a breakers yard) on a drag strip to make the vehicle go faster than it would ever normally be capable of: The easiest type to do this with might be a turbodiesel, since it would probably be possible to fit some kind of device to deliberately make the turbocharger start leaking oil into the intake manifold. After all, one of the most common causes of diesel runaway is this happening by accident - the turbocharger oil acting as "extra fuel" for the engine.
Unless you had a very large and unobstructed runoff area (like if you were doing this on the Bonneville salt flats), you would need some method of reliably shutting the engine down that you could trigger from the drivers seat - such as a big flap valve fitted to the air intake, or a carbon dioxide fire extinguisher pointing at the air intake. Anyway, what I am imagining is this: Get the car moving off the line as normal and accelerate enough to get into top gear - and at that point, activate the device which makes the turbocharger oil leak, which should then trigger the diesel runaway.
Somehow I doubt that I am the first to consider this idea, but what I don't know is whether anyone has ever tried it, or whether it would actually work - as in how much faster would it make the car or truck go?
That poor little single cylinder generator was not a runaway. Those geniuses put gasoline in the fuel tank of a diesel engine. They could have saved that generator if they had immediately shut it down, cleaned the gasoline out the fuel system, and refilled it with diesel fuel. Instead, they just watched it burn up and stood there making remarks like: " The muffler is turning to plasma." and "It's brand new." That little generator would have been a clean, reliable, source of electricity with excellent fuel economy if those guys had just put the correct fuel in it.
most people are unbelievably stupid
How does it even run on gas? Or is it not like gas cars that can't run on diesel.
@@ThatOneGuyWithTheEye Lower compression with a fuel air mixture ignited by a spark vs high compression air that creates high temperature heat with a squirt of fuel both methods will ignite gasoline for gasoline very volatile.
@@ThatOneGuyWithTheEye 'sacly. The claim that you can run a diesel engine on petrol is complete bogus. Back in the days, some petrol was mixed into diesel for keeping the gunk fluid at very low temperatures, but there still the diesel started the controlled combustion.
Pretty sure that's not possible. There are no spark plugs in a diesel engine, since the combustion of diesel relies on high pressure instead of a spark (the main reason that runaways occur in the first place). Gasoline needs that spark in order to ignite. So putting gasoline in a diesel engine will cause it to just.....not run at all. Even if you started the engine with diesel and then poured gasoline in, it would eventually just shut off.
Gotta love the genius spraying starter fluid into a diesel 🤣
It's normal
It's normal. There are trucks that literally come factory with a tank of starting fluid built it
Some of em it’s the only way to get em turning
Standard starting procedure when I was a kid on the farm in winter. A squirt of WD40 into the air intake while the engine is turning over always gives the battery a chance to get it going.
I had a dodge truck turbo went bad i had no idea it would do that it ran away on me it had to rev up to 6 or 7 thousand rpms for like 5 mins till it trowed rods cam was on the ground under the truck it broke the trans in haft long ways crazyest shit ive ever seen that was 25 years ago i will never forget it !!
ive always wondered what kind of power numbers one of these runaways would produce on a dyno.
The torque actually drops so it might be a disappointment!
@@ludicrous7044 yeah sadly i figured the torque would drop some as your surely losing compression. but the sheer amount of rpms some of these turn compared to their normal rpm range. it would see the diff in number between healthy and 12k rpms. im almost willing to bet for a brief while the hp does increase. mainly just do to rpms.
pry look like most 4 cylinder dynos. high hp and almost no torque.
@@chehystpewpur4754 the heat damage from those insane rpms melt the pistons down. its why any attempts to save one in full runaway it just a wast of time.
@@gogereaver349 yeah i got that but your still missing the point.
@@chehystpewpur4754 no I'm not unless you stop it as it starts the motor is trash. So running around trying to stop it where It can blow up anytime is not worth it
My old boss stopped a runaway on a brand new Deere motor grader with a clipboard.
So, are these motors any good after a runaway ? Some are obviously done for, but if it gets shut down quick will it survive?
probably not. usually their pretty severely damaged. most runaways suck the oil from the crankcase and burn that and that means no lubrication. sometimes you get lucky but its not worth the risk to me. just like when an engine over heats and the block or heads can warp this can do the same thing from the heat and being well above the rpm range the engine should run at.
If the engine is still in good condition, here's a trick to fix this. Sometimes it doesn't work, but if you have a rag and a jug of diesel fuel, dampen the rag with the fuel and put it into the air intake, it will fire right up. And before you do all that, try to fix what caused it to runaway.
It really depends on the lifetime of the engine and the build quality. Regardless a couple of seconds higher than the rev limiter isn't going to cook the engine, but I'd say anything more than 10 seconds and it's gone. The bearings will be shot, all the fluids are cooked, the rings will be damaged and the connecting rods if they haven't broken yet are now damaged and weakened. Plus the valve train will be broken too.
@@-aid4084 But wouldn't all that make the engine stop?
@@franklofarojr.2969 yes, a damaged engine will lock up due to excessive friction and wear.
I didn’t know it was such a common thing. Grew up with family trucking company and never once saw this.
Same here, now im afraid of diesel engine lol
Your family clearly is smart and knows how to quickly stop them.
He really couldn’t tell something was wrong with that generator? It’s turning the muffler into plasma that’s a fire hazard like it was a damn feature of the unit my lord
He didn't sound like the sharpest tool in the shed. I wouldn't be surprised if he put petrol instead of diesel in it, or it didn't have any oil in it.
One thing for sure. It was strongly builted and last long.
Forgive my lack of knowledge on diesel engines and thus my possibly dumb question: Can diesel engines have an emergency air flap that would seal off the intake in case of a runaway? It would have sort of a 'break glass in emergency' switch. I'm guessing that at very least, it might be unnecessary in most cases?
Thank you 🙏 for sharing ☝️with all the Technology /diesel /missing shut off valve or switch 👋☮️
Easiest way to shut down a runaway is clog the intake pipe with a towel or a shirt something along those lines.
Make sure you hold on to it!🤦
Starve the cylinders for air the pressure will drop thus in turn will stop the diesel from igniting.
Used to know an guy who had an old Ford tractor, it would always start but would never shut off.
He would just pop the air cleaner and covered the intake pipe with his hand until the engine stopped running.😅
r/ihadastroke
just walk away the heat damage has aruldy coused way to much damage. you are only risking injury for a now junk pice of scrap.
Except if it's something like valve guides, I choked the intake on one acting odd because it was taking like 30 seconds to shut down from an idle speed.
And it revved back up.
After it shut off, I disabled it.
Definitely a runaway waiting to happen.
And no it wasn't the turbo because it was NA
give yourself a hickey 😂
I've heard of that solution of starving a diesel for air and they would shut off ! 👍👍
Wtf guys, just choke the air intake and the engine will stall ! !
They are not that smart
@@Bill-mr2oo obviously !
How about the red cummins that they choked the air and it still went.
Do it let me know what you learned
The yuppie at the end was clueless
Yes plug the exhaust if it's running backwards
Does this make the e9x 335d into a potential bandit? You could say it was a "ruinaway"?
The flames out of the stacks is insanely scary. You can see the brakes smoking too. The drivers heartbeat must have been closer to 200 😮
6:08 I really hope that driver bailed! Holy cow! I was like, bro are those flames coming out them pipes??? Wtf
It almost looks like someone put gasoline ⛽️ in it! A possibility. Cool flamees!
Or the turbo is shot.
turbo is shot, it won't run on gas...@@cpeast
The first one is the first person I've seen that knew what to do to get the engine stopped.
This is why diesel engines scare the crap outta me
We used to do runaways for fun at mechanic Christmas parties and take bets on how long they’d last. Good times.
Unfortunately with runaway diesels you only have 2 options.1 get close and stop it from taking air or stand let it run till it blows. There is a third option of setting the brakes and putting it in gear but results differ. If you take option one make sure to use something solid,NEVER use your hand
Some of the old Detroit 2 cycle diesels had an emergency shutdown flapper that would cut off the air to the engine. Those usually worked pretty well. Some of the old N series Cummins engines had a compression release that would hold the intake valves open. Those would instantly kill a runaway engine. Old time diesel mechanics would sometimes have a carbon dioxide fire extinguisher ready to spray into to the air intake of a runaway engine. That also was a very effective way of starving a runaway engine for air.
none of them are worth the risk if the runaway isn't stopped before it starts. because even if you stop it when you tare it down everything inside will be melted due to heat. at the end of the day you are buying a new motor no matter what.
Also put it in a very high gear not low gears
the one at 5:40 tries that, putting it in gear with breaks on, didnt work for him, and i think he blew either gearbox or drive shaft with how that chassie and frame twisted and buckled lol.
So once you block the airflow and shut it down, how do you REPAIR a runon motor?
The little red generator was not a runaway, it was a moron who bought it brand new and didn't put oil in it. I've seen the original video.
no oil or wrong fuel?
"ooh it's self destructing. Let me video it for half an hour to see if it gets any better"
Once again why I’m a petrol guy.
If you sprayed a fire extinguisher right into the air intake would that shut it down?
Always wanted a diesel pickup truck🥺
have you ever tried plugging exhaust on arunaway good f en luck
1:52
Never seen a locomotive do that before.
Oil-cooled turbo. If it blows a seal, lube oil sprays directly into the intake.
Sooo..... Turning off the ignition wont work?
Takes me back to the days of steam.
Oil leak at the turbo is the most common cause for this. It's my biggest fear with my Duramax. And it's not common, so I'm not worried about a lot… :-)
Yea. I just caught my stupid metric ford sprinling oil into the intake, took the turbo off last weekend to be fixed.
@@castirondude I had a scary situation that actually could have resulted in a runaway. I had a fuel leak at the high-pressure end, just before the injectors, and diesel fuel was spraying all over the inside of my engine compartment. I couldn't see anything, I could just smell diesel really strong. When I looked in the rearview mirror, I saw a huge, cloudy mist of diesel fuel trailing behind me. It was so bad, cars were slowing down. I was able to get it home, but if it was a gasoline engine, it would have erupted into a giant fireball.
I'm not well versed in Diesels, the last one I had was a 5 year old 1980 VW Rabbit, BUT would it do any good to put in a fuel line cut off? Just wondering
generally no. many run away engines are running off the oil supply. cutting the fuel could help if it was an injector but thats the only time.
It couldn't howt!! Don't want your wabbit to run away!!😁🐇
you see this alot more in turbo diesel not the old na diesel. turbo seal fails in a way allowing oil to flow into the cylinders and runaway. other things can cause it like blown shaft seals.
No.
No
Train has smoke and Soot. Will it have fire?
I have question....what happens if it's in gear and you deliberately stall it ...will the engine stop spinning??
4:50 sounded expensive 😂
Has anyone ever tried to plug up the exhaust pipe.. Anybody know if that will work or not
Runaway diesel happens common for one or 2 reasons
The engine runs on its own hot black sooty blood called used engine oil from a bad turbo or bad head gasket
If a turbo goes, the high pressure oil that lubicates the turbo bearings (and what ever sort of seal or clearence that keeps oil in there only) the bearing/seal fails oil gets pushed into the input turbine and gets atomized, sucked in and burnt
The other possible way is an engine with overhead lubrication and the head gasket that seals the head to the block leaks oil into one or more cyclinders and starts running on engine oil
Or the fuel rail gets stuck wide open
It would be nice to have a CO2 tank to flood into the engine to quench the combustion, in addition to a sliding "gate" type intake air shutoff.
Maybe you save the engine, maybe you don't, but you get it stopped quickly so your chances are better, and you minimize the heat build up that could cause a fire and burn the whole rig to the ground.
Obviously, those things aren't common because this problem isn't all that common, either. But with what a good tractor costs these days, I wonder if you couldn't get a break in your insurance having systems like that installed.
I wonder if the engine brakes on the exhaust would slow it down 🙄
Because the Jake Brake releases engine compression, it should vent all the combustion gas into the exhaust, which would prevent it from adding RPM to the crank, but would spool up the Turbo, unless there's also a wastegate open to bypass it.
It would suck if u travelled miles on the hi way and ur car starts to do this 😂😂😂
When u dont know and it happens its scary as hell ive been there done that and im a gear head i was 15 the first time it happened!
Basically a vehicle version of a seizure
I think the tractor at 4:40 busted its block. Hope everyone was okay!
Yeah that was absolutely wild. I live on a farm so this kinda hits different lol.
10:10 they are just chilling like: dude i don't care.
That cleans the carbon out
6:00 I'm sure a stretched out Peterbuilt like that was running a fully stock PACCAR engine.
next time i get busted for doing a burnout ima just gonna say to the cop its a diesel runaway mate chill
5:41 why did it dance like that?
The only bad idea is to spray starting fluid on a diesel engine, because the fluid can enter the fuel intake, thus mixing it with the fluid. That is a straight up bad for the entire engine.
Either I’m misunderstanding you, or you know absolutely nothing. Do you mean on or in the engine? And diesel usually has high pressure fuel, not negative. The real issue with starting fluid is that it will practically melt the inside of a diesel
I know that starting fluid has ether, so does gasoline. So I mean in the engine.
The land rover at the end was the crown jewel. The idiot that buys one of them, then this happens. GLorious.
I liked the Harbor Freight generator
since 2 yrs i hear this
7:00 engine rich exhaust...😂
As an american, diesel engines are very common here. (CAT, & Cummins.)
I think it's common worldwide
A diesel runs away on crank case oil , not fuel due to poor piston ring sealing.
what you
can do when a diesel runs away:
option 1: clog the intake
option 2: co2 fire extinguisher
option 3: epic clutch dump
option 4: run
these AI voiceovers are so annoying
Ball valve on the turbo oil feed anyone?
most im screaming cut intercooler rube
Whether you understand the mechanism of a runaway diesel engine or not, there is just one rule to follow:
"When restoring an old diesel engine, always prepare a plug with the same inside diameter as the intake pipe."
And before you try to start it for the first time, practice jumping out of the driver's seat and quickly inserting the plug into the intake pipe.
Make an effort to understand, as much as possible, the mechanism of a runaway diesel engine. A quick online search will surely reveal some explanation.
Understanding the mechanism of runaway will help you understand what you must check when restoring an old diesel engine.
These include serious oil leaks into the cylinders due to a broken head gasket, a faulty valve stem seal, abnormal wear of the valve guide, or a faulty turbocharger bearing seal. And oil spraying from the crankcase breather due to an incorrect oil level or broken piston rings.
In short, a diesel engine will never runaway unless engine oil mist is continually sucked into the intake. Understanding these things will also help you to "properly fear" the phenomenon of diesel engine runaway.
runaway diesel
Ask Q & A so 1 unplug battery, 2. cut fuel 3. block air intake. is that right.
2:02 this diesel train is normaly working
it a Runaway train riding on the track let go AC/DC !!!
That BCRail locomotive at 1:50 likely isnt even a runaway. I'd wager it's a blown compressor.
One solution not requiring tools would be to get a few litres of water in the diesel tank and pump will pick that up instead of the diesel as water is heavier. I wouldnt want to be trying to work near the engine trying to stop the air or the fuel feed to the high pressure pump.
Water does not compress,just blows holes in pistons
@@dougclarey3241 Diesel engines inject the fuel via injectors squirting minute amounts, when the water enters the system and is squirted in there would be no combustion. Your thinking of what happens to diesel or petrol engines suck water instead of air. I once had a petrol engine runaway and the noise is frightening, I'd rather be away at the diesel tank than at the inlet manifold when the engine explodes.
instead of helping, you film!! This is what they teach here in Europe!! gear 4 on and clutch up!!!
7:46 Im supposed to locate the air intake what? on that? 😂 No thanks.
does old rusty say Walla Walla Washington on it? grew up there.
Most of the time a fuel shut off won't work diesel engines can run on the motor oil in the crank case. You need a air shut off to choke them off no air can't run. Thke the air canister or breather off so you can get to the intake manifold and use something that is solid enough to cut off the air, by putting it over the air intake on the manifold.
ALL diesel owners should know where the fuel shutoff valve is-Their in different places!
Because it's not running off it's fuel it's running off its own oil
No, that is not the reason, read comments here and educate yourself on the only 2 solutions
At 4:45 WTH , Looks like that was on purpose !
Using starting fluid on a diesel is a bad idea.
@@HaydenSansingHe means the tractor
it a Runaway train Running right on the track let go AC/DC !!! 2:00
Yeah the runaway train (Running right on the track but not a #RockNRollTrain
th-cam.com/video/FrFvNphZ5BQ/w-d-xo.html
What's the oil temp reading? 😂😂😂
Original or Crispy
Yay humans
Even if you stop it, the engine is gonna have long term damage, grab your stuff and let it roll.
6:05 looks like CGI
1:50 so trains do runaway
why don't they put fuel cut off switch for diesel vehicles
1.Yes they do, in fact it's the only way to turn off a diesel
2.Most runaways are caused by oil leaking into the combustion chamber, so cutting off the fuel (aka turning it off, see no.1) is useless
It's almost like they should have an air shut off
Marker 10:11. How many idiots does it take to watch a diesel engine burn itself up...
Just put a small inline valve in and you can manually turn the fuel off
That probably would not help. Most of the time those runaway diesels are burning the lubricating oil from the crankcase. Cutting off the fuel will not help. The most common cause of a modern diesel running away is a bad turbocharger seal leaking lube oil into the intake manifold. The old Detroit Diesel engines would often run away if the fuel racks in the injectors were stuck open. In that case, yes, cutting of the fuel would stop the engine.
Dumb question but what it you disconnected the battery because isn’t that what heats the glow plugs ?
@@KronosOpie Diesel engines only use glow plugs as a starting aid in cold weather. Once the engine is running, the glow plugs are turned off and not in use. In a runaway situation the engine is already hot and burning its lubricating oil. So, the glow plugs, if the engine has them, are completely irrelevant.
@@KronosOpieyep, dumb question.
Some of these videos are really old.
Engaging a high gear and flipping the clutch with brakes on (10:02 min.) to stall a runaway diesel is no smart move. Clutch, gearbox and drivetrain possibly get killed as well while the engine in most cases is toast anyway.
It need some disc brake in the engine🫤
I don't know why people don't just stall their manuel diesel engines, like all those big trucks are surely not running an automatic transmission, so why not just put the park brake on in 4th gear foot on the brakes and let out the clutch fairly quickly 😅
Go out to your car, floor the gas pedal, and then try to stall it 🙄
@@David-ki6jq go out to your car and try to take off at full rpm in top gear with the hand brake on 😮 and only a diesel 😉.
Why don't they come with a safety choke .
Most personal diesel tucks in the USA roll down the road smoking like this, so I wouldn't know if it was in run away.
ディーゼルはMTが必須なんですよ
MTなら最上段に入れて止まるのに
AT、AMTは止まりません
エンジン壊れなかったらラッキー
AIR SHUTOFF VAVLE
Or anything else! Common sense has left the building 😂
How to shut off a runaway diesel should be required knowledge before being allowed to operate one.
Also ALL diesels should be required to have a valve in the air path that can be closed to shut off the air and those without one should be required to have one installed.
Lmao, wrong fuel in the diesel generator
Salut my friend super car . super video subscribe subscribe