Posted by Paul (in NY) on Wednesday, May 23, 2007 at 10:44:42 :
In Reply to: Re: Fuel Solenoid... posted by Jerry in Idaho on Wednesday, May 23, 2007 at 09:10:14 :
will limit the max rpms when being fueled by the injection pump in normal operation. This is true whether its a mechanical governor diesel or a computer (governor) controlled diesel.
Now, when an outside fuel source such as a blown turbo seal that allows engine lube oil to be blown into the intake or an outside flammable or combustible gas being fed into the intake, the engine is no longer under governor control. The engine has an independent source of uncontrolled fuel and will increase engine speed in a heart beat until the engine distructs. The only way to shut her down is to kill the air supply. The independent source of fuel is still there but can not burn without a air source.
The emergency shut down valves immediatelly when tripped shut off all outside air source and the engine shuts down.
By an immediate shut down, you can eliminate the destruction of the engine and repair whatever is feeding it oil. If it only ran away due to an external source of Combustible or flammable gas, once that area is cleared, the engine could be restarted and continue on your way.
Paul