run away diesels

[jman69]

Hi there, have just been watching youtube videos on runaway diesels. Would a simple fix be to have a fuel cut off switch fitted in the cabin? Seems to me to be a logical answer to this problem. What do others think?

[AB]

Runaway is most commonly added fuel from a different source such as what I just experienced by a seal on a turbo letting oil through the intake.

The oil is then the fuel for the engine not diesel so a fuel cut off will not do anything.

To stop a runaway you would need to stop air, a snorkel would be a winner by blocking the snorkel and starving the runaway engine of air or to try and stall the engine.

[nissannewby]

Runaway is most commonly added fuel from a different source such as what I just experienced by a seal on a turbo letting oil through the intake.

The oil is then the fuel for the engine not diesel so a fuel cut off will not do anything.

To stop a runaway you would need to stop air, a snorkel would be a winner by blocking the snorkel and starving the runaway engine of air or to try and stall the engine.

Look at you go..

[4bye4]

Years ago the mates cray boats over here had a butterfly installed in the air intake to shut off air as a last resort.

[jman69]

Sorry to hear about your turbo AB. Didn't realize that the oil could play a part in the problem. 4bye4 ,below, says that cutting off the air is a way of doing the same thing, so perhaps manufactures should incorporate a air cut off unit in their air induction systems??

[Throbbinhood]

My old hilux did this.. Oil got into the intake somehow and she just kept going, well past the 6k on the dash.. Lucky it was a manual, dumped it in 5th and dropped the clutch whilst standing on the brakes.

[4bye4]

Sorry to hear about your turbo AB. Didn't realize that the oil could play a part in the problem. 4bye4 ,below, says that cutting off the air is a way of doing the same thing, so perhaps manufactures should incorporate a air cut off unit in their air induction systems??

A big diesel in full run away has the potential to get air by destroying the butterfly valve or sucking the air intake flat or whatever. As I said, the guy I knew with this on looked at it as somthing to try before jumping overboard, always a last resort method.

[mudnut]

It happens rarely in diesel locos. They would get oil build up in the air box and that would be pushed into the engine ports and become fuel. It was one of the service items to drain them. Just think of a V6, V8, V16 with 567 or 645 Cubic inches in each cylinder revving like crazy. I never saw it but one of my workmates had to 'abandon ship' when a Y or a T class (can't remember which) suffered runaway. Remember the instance where a forum member forgot to take a plastic bottle from his snorkel head? The vacuum would be many times that on a runaway. As has been said, apart from dumping the clutch on a manual, there is bugger all you can do but hope the fuel source runs out.

https://www.youtube.com/watch?v=xmIfjmvXp0I

[jman69]

Ok, thanks for all the replies. Lucky mine is only a 2.8 and also a manual.

[firm351]

It happens rarely in diesel locos. They would get oil build up in the air box and that would be pushed into the engine ports and become fuel. It was one of the service items to drain them. Just think of a V6, V8, V16 with 567 or 645 Cubic inches in each cylinder revving like crazy. I never saw it but one of my workmates had to 'abandon ship' when a Y or a T class (can't remember which) suffered runaway. Remember the instance where a forum member forgot to take a plastic bottle from his snorkel head? The vacuum would be many times that on a runaway. As has been said, apart from dumping the clutch on a manual, there is bugger all you can do but hope the fuel source runs out.

https://www.youtube.com/watch?v=xmIfjmvXp0I
Nothing like a runaway EMD, had a 567 runaway once, blower seals let go and pumped it full of oil and away she went. Pulled the govenor button and walked away until it eventually petered out and stopped.

Had a 16v 149 detroit take off once during a load test, coming off load it took off. Had siezed a fuel rack on 1 injector which held all the injectors at full fuel with no load on the engine. Hit the emergency stop button which drops the air intake flaps then sucked all the intake seals in and kept on going. Oh shit... turn the fuel off, still had about 1 minute worth of fuel in the lines until it stopped. That was a fun day.

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[Hodge]

We had a Hino truck runaway on us about 10 years ago. It's a cherry picker truck setup and it isn't fun being 15m up in the air when the all of a sudden the motor starts revving it's gaskets off... and no emergency stops worked!

[tuckertrucker]

Runaway is most commonly added fuel from a different source such as what I just experienced by a seal on a turbo letting oil through the intake.

The oil is then the fuel for the engine not diesel so a fuel cut off will not do anything.

To stop a runaway you would need to stop air, a snorkel would be a winner by blocking the snorkel and starving the runaway engine of air or to try and stall the engine.

Yeah I just suffered the same thing.... oil seal in turbo blew and oil blew through the intake. Engine very quickly climbed to 3500 and with my foot on the brake I pulled into the nearest drive way and stole their garden hose, soaked my shirt and wrapped it around the filter. Starved it of fuel and after about 10 seconds the engine stalled itself.

Then a rather red faced home owner comes running out wondering what all the noise was and why there was a shirtless fat shit standing in his driveway

[AlanK]

Hi there, have just been watching youtube videos on runaway diesels. Would a simple fix be to have a fuel cut off switch fitted in the cabin? Seems to me to be a logical answer to this problem. What do others think?

Hi !

Air intake shut off systems are the only proven, reliable method to stop a diesel engine once it has begun to run away. IMO of course

[pollenface]

I've had this happen on 2-stroke dirt bikes when they are hot enough and lean out, only lasts for about 20-30 seconds though.

[MB]

Tomahawks Maybe [emoji848]
We’ve ALL got one handy at ALL times [emoji23]


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[MB]

Crowbar, Shovel, Spade (USA), Anythink sharp I learned but never fortunately have had to try cutting off wicked compressors running Intake [emoji22][emoji106][emoji106]


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[Hodge]

Ha! Hows about a runaway petrol? Kind of, sort of.... Early bird visit to the butchers before GF crowds supply stock-up this morning and saw a bunch of folks around a popped Y62 bonnet in the car park. Car won't shut off. Keeps on idling. Key in/out, button presses did nothing. Positive 12v disconnect killed it swiftly.

Got me thinking. TD is a dumb diesel motor. Older non-electricy ones would keep on trucking without 12v once started.
But how about the new-ish ones with that NATs shut-off valve on the pump and the #1 injector somehow being tied electrically (nuffy here speaking).
Would they shut off without 12v?

[Winnie]

Our old TD42 still need 12V to keep the fuel solenoid open.

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[Hodge]

Our old TD42 still need 12V to keep the fuel solenoid open.

Sent from my SM-G986B using TapatalkReally ??
We took a battery out of a running GQ and put it into a dead alternator/ battery, Dmax so we could limp it to towable grounds.
GQ kept chugging along.

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[mudnut]

Really ??
We took a battery out of a running GQ and put it into a dead alternator/ battery, Dmax so we could limp it to towable grounds.
GQ kept chugging along.

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Didn't kill the alternator on the Q? The regulators really do not like having an open circuit.

[Hodge]

Didn't kill the alternator on the Q? The regulators really do not like having an open circuit.

The GQ owner is on the cans next to me as I type this. Can confirm the Alternators been fine and its been around 3 years maybe since then?
It was a short run down from Matlock to Woods point rd where the tow truck was. Maybe 2-3km max distance.
But the TD definitey kept running when battery removed and alt wire taped back.

[mudnut]

The GQ owner is on the cans next to me as I type this. Can confirm the Alternators been fine and its been around 3 years maybe since then?
It was a short run down from Matlock to Woods point rd where the tow truck was. Maybe 2-3km max distance.
But the TD definitey kept running when battery removed and alt wire taped back.

Wow. I had no such luck. Running an old Corolla for a few minutes without the battery killed it.

[Winnie]

Hmm I'm certainly no expert and haven't experienced first hand but only going off what I have been told from knowledgeabe people.

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[AB]

100% td42 engines run with no battery, just good old compression chug chug.

I drove home from loveday SA 10 hour trip with no alternator and it was fine.

I just started old mate up and disconnected battery for 5 mins and kept chugging.

Fuel and compression. Love these engines!


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[MB]

Wasn’t there AB but your battery must’ve still been connected with a poofteinth of power in it to keep the diesel fuel solenoid open?
Our old Acco Cummins wouldn’t run with a blown solenoid fuse and remember we had to hot wire Philstar’s 6.5 Chev solenoid too out bush when his security system malfunctioned cutting power to it too. I honestly thought our beloved TD’s were the same with zero + power to keep the diesel line open?
Mad runaway I thought was mainly from failed turbo seals and big big diesels needed a tomahawk or the sharp like to quickly cut the post turbo intake side off from feeding oil in?


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[MB]

I stand corrected AB, my Apologies, Great Facetime tests: [emoji736][emoji736][emoji106][emoji106]
#1 Still runs and turns off with main battery terminal + disconnected.
#2 Still runs and turns off with main & auxiliary battery ++ both disconnected.
How does this work Folks, is it still the working alternator when running being connected to the system that allows the engine/solenoid to keep open?


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[MB]

Just read this thread properly from past Legend’s industry experiences, sounds like two options for humongous diesel’s?

#1 Runaway from turbo failure = choppy air off post turbo?

#2 Runaway from injector pump failure = choppy any electrical/mechanical lines to solenoid/fuel lines?

If in doubt chop everything before blowing up a very expensive engine maybe ?? [emoji848]

EDIT:

#3 Small diesels can be stalled by means of manual transmission, air intake blocking pre turbo and or worst case if all fails go the choppy?? [emoji23]

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[Fingers in Aus]

Truck mechanics where I used to work carried a piece of board in their breakdown vans for those occasions.
If they start running on oil from the turbo etc. cutting air is the only way to stop them other than the rods coming out the side.

[mihit]

Truck mechanics where I used to work carried a piece of board in their breakdown vans for those occasions.
If they start running on oil from the turbo etc. cutting air is the only way to stop them other than the rods coming out the side.

Thoroughly correct.... but, epic thread dredge...