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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