3rd Gen engine runaway

[Vaughn MacKenzie]

Well sounds like it faired quite well Chris, obviously it floated the valves and/or blown pieces of the HX-40 helped with that.



I wonder if the computer stops registering at 4750? That's spinnin' over pretty hard.



Hey if you haven't take some pics of your engine torn down



Vaughn

 

[nickleinonen]

new pistons and rings

how about slapping in them marine isbe articulated 2 piece pistons with the machined steel crown and aluminum trunk... ?

 

[DPKetchum]

Maker sure that where ever it got fuel or oil from is corrected. I've seen one repaired after such a mishap and on RESTART DID IT AGAIN to the disbelief of owner and friends standing next to it. Intercooler even after WHAT they thought was drained STILL had fuel in it. :--)

 

[David Oxland]

Any clue as to what the source of fuel ; commanded injection or ingestion from some foreign means?

 

[ChrisRyan]

David Oxland, the source of fuel for my truck was oil left in the inter-cooler from a blown HX-40 turbo. I did not clean the inter-cooler after installing a new B-1 turbo so my truck ran on the oil and could not be shut down. A stupid mistake on my part that hopefully no one else will soon repeat.

 

[sbentz]

More things to check during overspeed repairs

Sorry to hear about the runaway. We have this happen all of time. Our big truck customers lose a turbo on the road, come in a get a Recon, put in on without cleaning out the CAC. Most of the time it will not run away right away, it waits until you wrm it up a bit, rev it once, and get the oil fumes vaporized.



That is when the fun begins. Sometimes you can slam it in gear, but most of the time, it revs so fast, it just goes nuts.



Other things that happen during overspeeds:

Cam gear walks off of the cam. A little.

Flywheel and damper bolts come loose.

Crank thrust bearings get pounded out.

Tappets get chipped up from floating.

Bent pushrods or chipped sockets.



Does it sound like we have seen a few? We had 2 on the same day in one shop. One, the customer drove it out of the shop, and away it went. It scared the **$t out of him.

 

[sbentz]

More things to check during overspeed repairs

Sorry to hear about the runaway. We have this happen all of time. Our big truck customers lose a turbo on the road, come in a get a Recon, put in on without cleaning out the CAC. Most of the time it will not run away right away, it waits until you wrm it up a bit, rev it once, and get the oil fumes vaporized.



That is when the fun begins. Sometimes you can slam it in gear, but most of the time, it revs so fast, it just goes nuts.



Other things that happen during overspeeds:

Cam gear walks off of the cam. A little.

 

[Fastmach]

Another good reason to have a CO2 fire extinguisher in your truck. Aim it at the air intake, locate it now.

 

[Josparkz]

Originally posted by MO'Donnell

If I remember my fire science correctly, Halon produces Phosgene gas when burned/exposed to high temps - one of the reasons it was always stated to evacuate any comp. /electrical room BEFORE the gas discharged, and allow time for the gas to dissipate before re-entering the room.

So maybe I shouldn't be so proud of that Halon extinquisher I had to get for emergencies