Can M35A3's runaway?

[Commander5993]

New A3 Deuce Owner here. And after reading this thread and all the stories, I got to ask some questions:

On the M35A3 Cat, if a run-away/engine over-speed condition occurs:

First: Can it be stopped if it is caused by the introduction of an external fuel source (i.e. oil from turbo, gas vapors, etc)?

Second: If the answer to above question is "Yes". What is the quickest way to stop the engine, if the over-speed is caused by an external fuel source? Cutting of the air supply, by placing a solid object (like plywood) over the air intake?

Third: Would a person have enough time to do this before major engine damage occurs?
I'm guessing this question would depend upon the factors of what kind of fuel and how much fuel is being introduced.

Thanks

 

[AceHigh]

I need to take my own advice! Which is keep a CO2 fire extinguisher in the cab. In case of emergency shoot it into the intake.

 

[snowtrac nome]

A dry chem extuinguisher is supposed to be capable of plugging an air filter too. I don't know if I would try it unless it was a oh sh!T moment.

 

[porkysplace]

A dry chem extuinguisher is supposed to be capable of plugging an air filter too. I don't know if I would try it unless it was a oh sh!T moment.

They will eat aluminum over night if the powder isn't removed right away .

 

[Eliteweapons]

I had an idea that may work. Get a good heavy shower cap that you can toss over the mushroom cap? Would be quick and easy as long as it didn't rip right apart. I have a heavy canvas bag that fits over mine. I may have to test them to make see if it shuts it down or atleast slows it down.

 

[cattlerepairman]

Just for illustration purposes:

Air intake volume = displacement * RPM. So, for a multi accelerating past governed speed to 3000 rpm it would be
0.275 cu ft * 3000 = 825 cu ft of air per minute or almost 14 cu ft per second. For my metric friends, that is over 23000 l/min or almost 400 l/s.

That is a lot of air. You need a good shower cap for that!

In practice, a piece of 2x6, plywood, a thick old style phone book and the like are needed do effectively close the intake. It is not only the volume...the engine at this rpm has incredible momentum and, even when combustion ceases, will continue to spin and suck air, even creating a vacuum in the intake. Whatever you use to cover the intake hasd to be able to withstand that.

Hint: Don't use your hands!

I second the use of a CO2 (NOT A DRY CHEM) fire extinguisher as probably the safest and most effective way to shut down a runaway.

 

[WillWagner]

I have seen both used, the dry chem and Co2. Co2 does the job well, the extinguisher will be empty by the time things stop. The dry chem ruins the internals and the engine will need rebuilding. When i worked for International, the old guys kept a 2x6 with rubber attached to it on their boxes. My dad uncle and grandfather always had a pair of vice grips on the rack on the DD 2 strokes after an overhaul or rack set just in case it would take off. AFAIK, none ever had a runaway after maintenance

 

[snowtrac nome]

The heavy wood is my preferred oh sh!t tool, had a Detroit 6v53 eat through half the manual once. which why I don't put much stock in the theory a try chem extinguisher will plug an air filter.

 

[rustystud]

Whatever you do don't stuff your coveralls down the hole ! One of the mechanics at IHC in Tukwilla WA. did that. It ate the coveralls and still kept running ! After the rebuild (yes it needed a complete overhaul after that) there was pieces of coverall all inside that engine.

 

[SRB1976]

I work for Union Pacific as a locomotive engineer. I had a GE AC4400 engine runaway on me on a 23,000 ton soda ash train once. The fuel cutoff switch wouldn't kill it

Looked like this

https://youtu.be/6_M13Xlw0o4

 

[winfred]

we had a hotshot kid out of "isuzu school" show up at our gmc dealer who was gonna show us old farts (me and the only other diesel tech) how to work on them duramaxes! not sure what they taught him but it wasn't how to work on the fuel and emissions systems of a 6.6, the pinnacle of his ineptness was to grab a random antifreeze jug off a table hoping for water to rinse a spill off the air box (while it was running) and got brake cleaner instead, i was close enough to hear it probably hit 7 grand, at first i though someone was doing a burnout but once i heard it clattering to a stop i realized what it was and got out from under my dash for a look. it hung together but never ran again, nothing quite straight and everything scored. parts manager loved him as that was a $17k ticket

 

[rustystud]

we had a hotshot kid out of "isuzu school" show up at our gmc dealer who was gonna show us old farts (me and the only other diesel tech) how to work on them duramaxes! not sure what they taught him but it wasn't how to work on the fuel and emissions systems of a 6.6, the pinnacle of his ineptness was to grab a random antifreeze jug off a table hoping for water to rinse a spill off the air box (while it was running) and got brake cleaner instead, i was close enough to hear it probably hit 7 grand, at first i though someone was doing a burnout but once i heard it clattering to a stop i realized what it was and got out from under my dash for a look. it hung together but never ran again, nothing quite straight and everything scored. parts manager loved him as that was a $17k ticket

Don't you just love those young pups just out of school who have "all the answers" ! Just ask them ! They do have all the answers, just the wrong ones !
I still remember getting out of trade school and starting my apprenticeship training. The old mechanic I was first assigned too told me he didn't want to hear any "Bullsh#t" about how the school said to do things. He would tell me how to do something and I better do it his way or I would be looking for work again ! Later on when I actually knew how to do something I could do it my way.

 

[frank8003]

I don't know about the M35A3 CAT engine air intake, different than the M35A2 multifuel?
............... but Refer to post #46
Did you ever wonder why the multifuel air intake mushroom rock filter cap is shaped like that? Don't leave it cinched on tight, so it can be grabbed off and turned around. A piece of 3/16" sheet rubber and the inverted mushroom will seal it off, can't run without air.
The original designed air hose to compressor [item 6] from back of air cleaner should always be in place.

 

[snowtrac nome]

the 3116 can also suffer a run away if the rack isn't adjusted properly just like a Detroit so don't mess with rack adjustments unless you have the tool kit

 

[rustystud]

the 3116 can also suffer a run away if the rack isn't adjusted properly just like a Detroit so don't mess with rack adjustments unless you have the tool kit

The proper tools and information ! Running the "rack" without either is just a recipe for disaster.

 

[Slate]

Little off course but I had my John Deere 450C rev through the roof when I accidentally hit a poly line filled will Sour gas off an oil well. Scared the S#$T out of me but the machine drove out of it before any damage. Never thought my little machine could go that fast.

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