Runaway Peterbilt

[Captain Crawfish]

That's a $40,000 problem.

I quoted a 60 series detroit the other day at 32k just for the engine, and it didn't come with everything. You'll have some gaskets, labor and miscellaneous parts to add to that

popped a head gasket on one the other day. told boss hey man this things blowing white smoke and all the coolants gone. he says its an injector just add some water and keep driving it. hydrolocked it a few hrs later... i guess this is caused by overfilling with oil or a bad turbo seal.

[Captain Crawfish]

heres a runaway ups truck. listen to the old guy try to say hes gonna pull the battery and make it stop....lmao http://www.liveleak.com/view?i=724_1...893&comments=1

[Kyle]

If that was a turbocharger bearing failure which is what causes a lot of turbodiesel runaways....cutting the diesel fuel off wouldn't stop the engine because when the turbo bearing fails the oil supply which feeds the bearing is now being blown into the engine and burning as fuel uncontrollably...the only way to stop the engine at this point is to cutoff the AIR being drawn into the intake, wait it out from a safe distance until the engine oil supply runs dry, or the engine blows up, seizes, throws a rod or 2, or the turbocharger seizes up. Most of those options are going to be terribly expensive to repair.

This guy obviously knows his shit. I was just about to write almost the same exact thing, but you saved me the trouble lol.

[fastwhite99gt]

We had a wore out 6.9 stay running after you shut off the key, but luckily it wasn't near as bad as that, it just kinda chugged along burning engine oil. The worst one I had was the governor ring and retaining pins were worn off in a 6.2 pump, it went about 5000 rpm as soon as I bumped the key, luckily is shut off with the solenoid.

[sig239]

yeah the engine was ingesting the crankcase oil through the turbo charger supply and running off of it. The only way to stop it is choke off the air or shove it in high gear and physically stop the engine. Sled trucks usually have a big ass spring loaded plate deal infront of the turbo inlet that they can pull a pin on and shut air off to the motor if it runs away like this or the injector pump gets stuck. You could tell he was on the phone with his boss and he was telling him to shove it in gear to try and stop it.

Trying to stall a motor with that much tq and hp it would destroy the drive line and keep on going, if lucky it would just twist the drive shaft or snap u joints.
When I hauled fuel we had a switch that we could push that shut a spring loaded cover over the intake pipe cutting off air.

[Clifton]

co2 fire extinguisher into the breather?

This is what I've been told.

[svauto-erotic855]

Couldn't he have put it high gear with the brakes on and dump the clutch?

That would just snap the input shaft.

[Skidonenko]

Good thing it seized up before it came apart.

[big_tiger]

co2 fire extinguisher into the breather?

x3 I was thinking this before I read your post.

[JP135]

The transmissions have what's called a stop brake on the input shaft, when you push in the clutch it stops the input shaft from spinning to make it easier to go into gear. I'm not sure if it would've helped in this instance, but it could.

That brake won't stop/hold if the engine is at WOT.

. Sled trucks usually have a big ass spring loaded plate deal infront of the turbo inlet that they can pull a pin on and shut air off to the motor if it runs away like this

I've heard some of the old-timers talk about this being a pretty common thing people would install on the old Detroits.

co2 fire extinguisher into the breather?

That's the one I've always heard. Never had to do it myself. Hope I don't ever have to!

[Strychnine]

I've heard some of the old-timers talk about this being a pretty common thing people would install on the old Detroits.

Any diesel engine (tractor or equipment) going into the oilfield gets upfit with an air shutoff valve (butterfly or guillotine). It gets installed at the intake manifold (post turbo and CAC) and can be tripped with a manual switch or an automatic overspeed sensor and can be either electrically or pneumatically actuated. They are also tied into the engine ECM to cut all fueling when closed.

[racrguy]

That brake won't stop/hold if the engine is at WOT.

It stops the input shaft when you push the clutch in, I don't see how the engine being at WOT matters.

[JP135]

It stops the input shaft when you push the clutch in, I don't see how the engine being at WOT matters.

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.

[JP135]

Any diesel engine (tractor or equipment) going into the oilfield gets upfit with an air shutoff valve (butterfly or guillotine). It gets installed at the intake manifold (post turbo and CAC) and can be tripped with a manual switch or an automatic overspeed sensor and can be either electrically or pneumatically actuated. They are also tied into the engine ECM to cut all fueling when closed.

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

[Rreemo]

I know I've posted some of these before. Here's a pretty good one with an old Detroit...the young dude just ran the hell away...luckily they had the old Dude around who knew right what to do....

Action starts around 2:00



I saw this one posted somewhere else a while back....interesting project this guy is working on....

This one starts getting interesting around 1:30....





If you do a search on youtube for "diesel runaway" there are some pretty good ones out there....there is one out there of a brand new Powerstroke running away on the dealership lot.