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oldpilgrim
Elite Member
I was looking at that before I posted.
Runaway diesels
- Thread starter oldpilgrim
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I was looking at that before I posted.
RNeumann
Elite Member
We have several diesels and have had several for decades. It used to be normal to have a factory emergency shut off. But our fleet hasn't had an emergency shut off since the 1980s.
Not saying it doesn't happen. I'm saying it hasn't been an issue that required a factory fuel shutoff for decades.
WM75Guy
Elite Member
Most newer diesels don't have a purely mechanical fuel pump, there is an electrical cutoff somewhere in the system. When I first started in the fire service everything was mechanical and the only way to stop the diesel engine was to pull the fuel shutoff knob. I have never seen a runaway situation where a fuel shutoff would have stopped the engine. It was always caused by another fuel source such as natural gas, oil, or spilled products. As others have said cutting off the air is the only solution.
The fuel shutoff did come in handy when one of the firefighters was backing a 1970 Mack up the ramp into the station and lugged the engine down to low RPMs. It was in reverse and rolled forward causing it to start running backwards. Fuel shutoff came in handy then.
The fuel shutoff did come in handy when one of the firefighters was backing a 1970 Mack up the ramp into the station and lugged the engine down to low RPMs. It was in reverse and rolled forward causing it to start running backwards. Fuel shutoff came in handy then.
tjkubota93
Veteran Member
I saw 2 trucks at work do it.
One was an international that had twice as much oil as required put in. It ran until it made a loud pop and quit.
The other, a freightliner that had a bad turbo. After installing the new one, the tech cranked it up. The intercooler was full of oil from the bad turbo. It ran faster and faster until the flywheel exploded.
Like they said, you have to cut off the air.
One was an international that had twice as much oil as required put in. It ran until it made a loud pop and quit.
The other, a freightliner that had a bad turbo. After installing the new one, the tech cranked it up. The intercooler was full of oil from the bad turbo. It ran faster and faster until the flywheel exploded.
Like they said, you have to cut off the air.
notuck
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A CO2 fire extinguisher will stop a runaway dead in its tracks. Direct the discharge at the air intake and spray till the engine stops. The carbon dioxide displaces all oxygen and doesn't allow combustion to take place inside the cylinders.
Petrol and Powder
Member
/\ THIS !! /\
DLTTrekkers
Veteran Member
Overfueling from an oilbath airfilter or a broken thermostart valve will cause that also !
Lockport
Platinum Member
Yippurs, gotta pop the hood, rip the little rubber doo-hickey off the air intake spout and cover it with the palm of yer hand.
Shut off the sediment bowl too if yer have one.
Sent from my LON-L29 using TractorByNet mobile app
Shut off the sediment bowl too if yer have one.Sent from my LON-L29 using TractorByNet mobile app
rokit
Member
Yeah, the normal fuel delivery system will not result in a runaway. Runaways happen because of dorked up governors in the injection pump (i.e.: someone messed with it mechanically) or a rampant oil-scavenging situation.
A shutoff petcock added in would be nice for fuel filter servicing, though.
ETA: the 1526/3016 actually do have an electric lift pump. I was mistaken in another post when I thought they did not. If you shut the key off, the fuel will stop flowing to the injection pump.
A shutoff petcock added in would be nice for fuel filter servicing, though.
ETA: the 1526/3016 actually do have an electric lift pump. I was mistaken in another post when I thought they did not. If you shut the key off, the fuel will stop flowing to the injection pump.
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