Runaway Peterbilt

[Strychnine]

John Westley (blue302stang) told me once about one of their 5.9 Cummins trucks that stuck the fuel rack open and was in a runaway state.

He said he popped the hood, stood on the bumper w/ a 5 lb sledge and started bashing the 6 fuel delivery lines on top of the pump until they were bent and kinked enough to kill it.

RIP John!

[sig239]

That's the one! I was thinking all the oilfield equipment had this but wasn't sure.

Yep we had them on our fuel tankers also. they will stop the engine real fast.

[stephen4785]

If you'd used em very much, you'd understand better. At idle, when they are adjusted properly (older trucks are almost never adjusted right and they can and do wear out regularly when steering-wheel-holder type of driver mashes the clutch all the way to the floor and leaves it there for a long period and repeats this action multiple times daily). Strychnine could probably give you more detailed information on this, but they are designed to slow/stop the input shaft at idle, which allows a heavy duty, non-synchronized transmission to be put into gear. They aren't designed or capable of stopping the input shaft at high RPM.

I think he means why not stick it in gear and dump the clutch. He's not saying the clutch brake will stop the engine. He's saying the clutch brake will stop the input shaft from spinning and then shift it into gear and dump the clutch so it kills the engine.
Like already stated it would just snap the input shaft or grenade the clutch.