steponmebbbboom
Active Member
some clarifications; on a two-cylinder detroit with one injector rack seized in the wideopen position, a sprung rack wont really help with shutting down the engine as you're only cutting power to half the engine. also, a detroit engine cannot run away in reverse, the timing is so far off you will barely get an idle out of it. which is why blocking the intake might actually stop it successfully. and thirdly, pulling the stop lever does not cut off fuel flow to the injectors, injectors are fed from a gear pump that supplies fuel to a common rail and jumper lines to the injectors, and pressure is maintained at 50psi through a restrictive orifice in the return elbow coming off the head.
detroits can overspeed for a number of reasons, stuck injector racks being one, plugged airbox drains being another, improperly set or damaged governors most commonly, and leaking blower shaft seals. if you have the means to stop an overspeeding engine with a large CO2 extinguisher, it is the least harmful method as closing the emergency stop flapper or plugging the intake will create enough vacuum to suck the seals out of the blower shaft. be aware the engine moves a lot of air at those RPMs and you do not want to get body parts stuck in the intake when this happens.
if you have a small CO2 extinguisher either deadhead the hydraulics slam it into top gear and dump the clutch or close the flapper before the RPMs pick up again. you have only seconds to save the engine before the block and crank are destroyed.
if you have a machine with a detroit take this opportunity to verify that you have an emergency stop flapper installed on the blower intake, that can be easily tripped from the operator's position so that safe control of the machine can be quickly regained in the event of a runaway. and make sure the operator is drilled and drilled again on its proper use so it's not forgotten in a panic situation. D
detroits can overspeed for a number of reasons, stuck injector racks being one, plugged airbox drains being another, improperly set or damaged governors most commonly, and leaking blower shaft seals. if you have the means to stop an overspeeding engine with a large CO2 extinguisher, it is the least harmful method as closing the emergency stop flapper or plugging the intake will create enough vacuum to suck the seals out of the blower shaft. be aware the engine moves a lot of air at those RPMs and you do not want to get body parts stuck in the intake when this happens.
if you have a small CO2 extinguisher either deadhead the hydraulics slam it into top gear and dump the clutch or close the flapper before the RPMs pick up again. you have only seconds to save the engine before the block and crank are destroyed.
if you have a machine with a detroit take this opportunity to verify that you have an emergency stop flapper installed on the blower intake, that can be easily tripped from the operator's position so that safe control of the machine can be quickly regained in the event of a runaway. and make sure the operator is drilled and drilled again on its proper use so it's not forgotten in a panic situation. D