Runaway c12 cat

It had to have been running on an external source of fuel other than diesel, such as engine oil. If this was a rebuilt turbo, maybe something wasn't done right with the seals when it was rebuilt? I had the turbo replaced on a Mack E7 and ever since there has been oil coming from the cac connections, told mechanic and he didn't seem to think much, so I'm waiting for this one to do the same thing...

 

Just throwing this out there but did you make sure oil drain sticker or plug was removed prior to install.

 

Why did you replace the turbo? Did it grenade? If so did you clean the Charge air cooler? Also as said above make sure the sticker was remove or nothing obstructing the oil drain tube?

 

As in oil in the CAC. That and oil likes to find little places to hide. Then the engine uses the oil as fuel.

 

Yep, oil in the air to air.

 

If you broke the through shaft on the turbo, oil is pumped into the aftercooler while the engine is running afterwards. The oil accumulates in the aftercooler. Once you install a new turbo the new turbo pushes air through the cooler and whips it into the air entering the engine. The engine starts burning this oil as a secondary fuel source and increases RPM. The extra RPM turns the new turbo harder which whips the oil harder into the air stream..........the engine burns the oil and increases more RPM......this goes on until you get scared and turn the key off.........but it's too late. The engine continues to run and accelerate whipping more oil out of the cooler........the only way you can shut it down is to cover the air intake to stop air flowing into the engine. If you can't do this fast enough before the engine RPM gets to high, you break engine parts. You may want to make sure the valves aren't bent and haven't hit the piston crowns from valve float.

You also want to remove the aftercooler and drain the oil out of it and flush it before you restart the engine again. Otherwise you maybe repairing the engine a second time

 

FastCars, you can read my thread called "A Detroit 500 riddle, can it be solved?" in this forum. Same thing happened to my friend's Peterbilt, cac wasn't cleaned out, motor used oil as a fuel source and ran off until it blew up. Best way to kill the motor is cut the air supply, but of course, you would have to be prepared for it first.

 

According to some on this forum this can't and doesn't happen.

 

It happened to a local propane company that had a truck get a steady feed of propane,,driver had the truck idling when he evacuated his lines to disconnect,,,the engine got a sniff of that stuff,,,then all kinds of crap inside the engine decided to disconnect!!!