3406 B failed emissions in NY

Well, I've bought many new diesel engines in my life, and not ask of them came with a governor. In fact, back in the day when you rebuilt an engine you had to have a way to sit down its air supply so it wouldn't run away on the first start up. The shops used a foam chemical charged in a canister resembling a fire extinguisher. us common folk kept a big thick phone book ready to shove over the intake. if every engine had a governor to limit rpms, how was it a risk your engine could run off?

 

Very simple,that was on 2 stroke Detroits.Their governors were controlled by oil pressure,if the fuel racks were improperly adjusted on a rebuild,the increasing oil pressure made it next to impossible to manually pull the fuel racks down to shut off.That's why they are the only diesel with the air box emergency shutdown.Just the nature of their design.Cat and Cummins were completely different fuel design,Cummins with a simple PT (pressure time) pump,and Cat with the Bosch type fuel injection.No runaway issues with them.If you bought a new engine in a truck,it had a governor.

 

Because the governor limits the fuel injected into the engine. If oil is entering in through the intake (i.e. blown turbo), then the engine is not relying upon the fuel pump and injectors to provide the fuel for combustion so the governor is essentially bypassed and the engine runs away.

 

In the 60's and early 70's,I was a journeyman diesel mechanic for International Harvester at their factory truck shop in Baltimore.I was their factory trained Detroit Diesel startup mechanic,and had to make sure every new Detroit powered truck was set to factory specs.Checked valve and bridge lash adjustments,check governor for correct operation and for correct rpms,make sure both shutoffs worked.Also would hook a pressurized fuel supply to engine with dyed red fuel and check for internal fuel leaks at the jumper lines and injectors,common problem back then.
Detroits venture into turbocharging on top of the supercharger was the 8v71t,these engines didn't work well,to much heat internally,made them more prone to cracking heads then they already were.The 8v92t's were a little better,with increased combustion cooling,but they lacked torque,which was inherent to the short stroke V design and with the oil leak design,(blower box overflows),they just wouldn't meet todays standards and their days were numbered.
I have never once seen a turbo failure on a big bore diesel cause a "runaway".It will make a mess,smoke,run horribly,cause lots of other damage,but not runoff.The turbo oil feed line is usually a 1/4 hose,and theorectically,to feed 800+ cubes enough fuel source to runaway on,well,I don't think it's going to happen.If you have documented proof of this causing a runaway,please post,I would like to see it.
I have seen Cats and even rarely Cummins have pumps stick at high governed rpms,but never runaway.Again it's just not in the nature of their design.

 

I have never once seen a turbo failure on a big bore diesel cause a "runaway".It will make a mess,smoke,run horribly,cause lots of other damage,but not runoff.The turbo oil feed line is usually a 1/4 hose,and theorectically,to feed 800+ cubes enough fuel source to runaway on,well,I don't think it's going to happen.If you have documented proof of this causing a runaway,please post,I would like to see it.
I have seen Cats and even rarely Cummins have pumps stick at high governed rpms,but never runaway.Again it's just not in the nature of their design.

The fuel supply tubes to 3406E are only 1/4 in and more than enough to feed around 900 CID with 800 hp.

 

Thanks,what kind of engine is that?Running on oil and fuel,but it doesn't sound like it's over speeding the high idle on the governor,just stuck wide open,not climbing higher and higher like a runaway two stroke..And yes the fuel lines are 1/4 butt are under much higher pressure than oil.

 

I have a 8V-92 in my Transtar, no emergency shutdown, and when you turn it off you better hope there is minimum 40-45 lbs air in the tanks, or it won't shut down. New drivers today would be lost trying to figure it out...

 

Yes,by the time the 8v92's came into exsistence,2 cable mechanical engine shut downs were a thing of the past,most had low oil pressure and overheat safety shutdowns.Most drivers also didn't realize that once a two stroke Detroit Diesel is shutdown,the fuel racks automatically go into full fuel position.When you start the engine,the rpms jump up briefly until the oil pressure to the governor takes over,and pushes it back to idle.

 

We had a Chicago Pneumatic T650 air rotary drilling rig with a 6V92 power unit, at idle it would scare people when they seen 10 lbs oil pressure at idle. You could hear that O'l girl bellow across the mountain tops when we was drilling in the mines.

 

I got an Idea DougA take a nice warm 900ish cube engine that you own, pull the turbo intake pipe off insert a 1/4 inch oil hose at 60 psi and record your findings, Oh and don't chicken out when the valves start floating just stand there and hold onto the hose ' cause there is no way for the engine to runaway on vaporized oil from a 1/4 inch hose.