Posted by BarnyardEngineering on February 10, 2021 at 06:53:06 from (161.69.123.10):
In Reply to: Diesel run a way posted by Steve Metcalfe on February 10, 2021 at 06:26:40:
On your typical average everyday turborcharged 4-cycle diesel engine, a runaway is often caused by a bearing failure in the turbocharger.
Pressurized oil is sprayed into the compressor side of the turbocharger, which then thrashes it into a fine mist and feeds it to the cylinders, causing the engine to run faster. The faster it runs the more oil is sprayed in, causing the engine to run even faster. Now you have a runaway.
Eventually the engine runs out of oil, and you know what happens then.
Diesel engines do not have a way to throttle the air intake like a gas engine. RPM is controlled by the amount of fuel being injected by the injector pump, but since the fuel is not being supplied by the injector pump in this situation, there is no way to control the speed of the engine.
The only way to stop the engine is to get to the air intake and plug it however you can before the engine runs out of oil. I've heard of people stuffing their shirts, coats, etc. into the air intake, and sometimes the engine even ingests them.
A Detroit runaway is a whole different animal. This is usually caused by stuck injectors supplying full fuel to the engine causing it to run at well over rated RPM. In this case the engine just beats itself to death instead of running out of oil. Many Detroits have an emergency flapper in the intake for just such an occasion.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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