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Go Back   Dodge Cummins Diesel Forum > 2nd Gen. Dodge Cummins 98.5-02 24V Forums > 98.5-02 Powertrain
98.5-02 Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect..NO ADVERTISING .

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Old 12-28-2012, 04:10 PM   #1 (permalink)
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More runaway diesel engines

Gas engines generally wont runaway because they have throttle plates or something like that to control the airflow. No air flow...no combustion. Diesels generally do not have throttle plates so just closing them to stop a runaway probably isn't going to happen.

Diesel engines runaway for 2 reasons. Either the fuel control is stuck at full flow OR the engine is drawing fuel from another source. The real scary runaway engines were the old Detroit Diesel 2 stroke engines. They were fed by a nice big super charger and the injector flow control (the rack) was tempermental when it was adjusted. If the "rack" was stuck in the full flow position the only limiting factor to engine speed was the amount of air delivered to it...oh wait...it has a supercharger... When one of these ran away you had a couple of seconds to catch it or else. Our SOP was to always have a pair of vice grips and a bungie cord on the rack to hold it at idle on start up.

A cummins doesnt have a rack to stick. The chances of all the mechanical and electrical stars aligning to cause a runaway from fuel are very very slim.
In practicality the only way a cummins could runaway is from an external fule supply like oil in the pressure side of the turbo.

I have have seen runaways from blown turbo seals or turbo seal oil leaks BUT usually they are more of a no stop condition instead of a runaway. The amount of fuel (motor oil) that can be mixed with the pressurized air is limited,the air fuel mixture is far from precise, and the ignition timing is way off.

Bottom line is don't panic. Unless you are parked next to a leaking gas well, in which case you should run very fast, just stop the air flow any way you can. I contend that breaking the boost line somewher between the pressure side of the turbo and the intake will kill the motor because this will disrupt to fuel(motor oil) and air mixture from being sucked into the intake.


This is a runaway!!!
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Old 12-28-2012, 05:42 PM   #2 (permalink)
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Wonderful video to learn from.

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I contend that breaking the boost line somewher between the pressure side of the turbo and the intake will kill the motor because this will disrupt to fuel(motor oil) and air mixture from being sucked into the intake.
Pocket knife and cut the boot open.
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Old 12-28-2012, 05:49 PM   #3 (permalink)
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I was watching that clip a few days ago and I can't believe that engine held together. I was expecting a big bang to happen.
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Old 12-28-2012, 06:50 PM   #4 (permalink)
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Those old detroits sound like they're spinning alot more rpm than they actually are... I love how that kid sh!t his britches and the old man just nonchalantly walks over and chokes it out with a 2x4


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Old 12-28-2012, 07:14 PM   #5 (permalink)
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I love how that kid sh!t his britches and the old man just nonchalantly walks over and chokes it out with a 2x4
I noticed that too! The look on his face was priceless haha. The old timer just calmly walks over, picks up the board that was there the whole time, and puts it over the intake.
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Old 12-28-2012, 08:21 PM   #6 (permalink)
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Campare this "runaway" to the Detroit above. Look how crappy it's running. Not screaming like a Detroit with a stuck rack.
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Old 12-28-2012, 08:32 PM   #7 (permalink)
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Working on old boats for a living, we always had a board to staunch the flow of air in the DD's. Yeah, we learned the hard way. It was a glorious lesson, though !!!
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Old 12-31-2012, 01:44 AM   #8 (permalink)
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That kid with that ol' Jimmy thought it sucked the rag down the intake, but it clearly didn't. I bet it blew out a lot of old carbon though.


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