Came in as an unrun. ran the usual tests, suspecting injectors, check for codes, run fuel system tests, yadda yadda.

fuel system tested fine. made a few calls, ( this vehicle came from another dealer ) Ahh , more info. seems it died on the road, just shut down. HMMMM.

ran compression check , all cyls 360-380 psi at 145rpm crank. manual says 300psi or lower is suspect, hmmmm. called tech asstance, 'splained to them what I had. Seems 450+psi is more normal on crank rpm.

pulled the upper valve covers, and there is is !!! , could pull EVERY exhaust push rod out of the engine WITHOUT removing the rocker arms.

This ain't good kids !!! There is supposed to be a bridge between the exhaust valves on each cyl ( 4 valves per ) it is also missing, I find these down in the deeper in the head next to the valve springs, but the buttons that the tips of the rockers push on are gone. SHATTERED pieces in the head, pieces in the oil pan.

EVERY exhaust valve push rod is bent, the tip of every exhaust rocker arm is trashed.

parts total ( so far ) 16 push rods ( replacing intakes just in case ) 8 exhaust rocker arms ( $130 ea) 8 bridges and buttons. and fluids.

is it warranty ? I dunno, it's not my call. Not my decision, I'll let the brass figure it out.

I have a pretty good idea what caused it ( starting fluid ), but I can't prove it.

just a little interesting carnage to fulfil your weekend.

Kevin
( soon as I can figure out how I'll post pix ) Edited by: Blkvoodoo

OMG............. I think they outt'a outlaw the damm stuff. Nothing worse than an IH tractor that "won't start" below 65 degrees because some nuckelhead used three bottles of hell trying to start it.... without FUEL!http://www.dieselplace.com/forum/smileys/Angry.gif





Burner------------> http://www.dieselplace.com/forum/smileys/Big Smile.gif

As a class 8 diesel mechanic by trade we call it job security in a can....http://www.dieselplace.com/forum/smileys/Big Smile.gif

Tom


What is a class 8 diesel mech, never herd of this one before. W D 40 best starting fluid I ever used.


Geno

Geno,


Class 8 refers to the heavy trucks 33K and above


Pete

Why even use starting fluid? I understood it is used for really cold starts.

Starter Fluid in Late August in North Carolina ?
Something tells me anyone that dumb doesn't get to buy new(ish) trucks - no job, no credit, etc.
So, what's the latest scoop on this one ?

as I was reading this, my first thought was Ether as well. I have replaced an engine that I assume was Ether'ed.. dropped the valve and it took the piston with it on the way to the pan. GM knows what Ether does to an engine and they likely might give grief on this one. Be interesting to find out the results... A runaway for sure nonetheless

A runaway for sure nonetheless

The Plot thickens !!!

Ok,pulled oil pan, inspected for extra parts, got all the new valve train
parts assebled, reassembled the engine, got everything buttoned up last
Monday afternoon.

Still not completely satisfied there isn't more damage, I proceed
cautiously.

Primed fuel system, crank engine over several times with FICM relay
removed to get oil to new parts, sounds much better than when it came
in, normal even ( on crank )

Reinstalled relay, ok here goes, started right up, idles normal, no noises,
knocks or bangs. WHEW ! man what a relief. checked the Tech 2.
everything is good, all pressures and rates are normal ranges.

Let it sit there and idle a few minutes, recheck the Tech2, all is well, I tap
the accelerator.

KNOCK Rattle, RPMs start climbing, ( Uhoh!! ) then... WIDE FREAKIN
OPEN !!!
I hit the key to shut it off, IT'S STIL RUNNING !!! WIDE OPEN, ok, time for
me to exit, I head to another stall looking for something to choke the air
off waiting for the inevitable. after about 20 seconds ( seemed like all day
) it shut down. I hear the door chime ( now I know I did shut it down ) and
the whole shop is full of thick smoke.

Ok, now that I'm awake and it has my FULL attention, WTF !!!! I've done
DOZENS of injector replacments, same basic proceedure here, just
remove the
rocker assemblys instead of injectors. reassemble, adjust valves ( a real
treat in a C5500 ) and reassemble. done dozens of SB chevy's, fords,
Toyotas. DID I do something wrong?

I let it sit till Thursday and dug back into it. pulled off the charge air tube
between the Intercooler and the intake. A light oilly fluid runs to the end
of tube. I pour it into a cup, too thin and too clean to be engine oil,
smells like stale diesel. Ok, now I'm curious. so I tear down the front end
and pull the intercooler out. Once removed I tip it on end and... out pours
even more of the same oilly fluid.

I've collected about 3oz of this now. should be enough for a sample, I'll
let the Rep figure this out.

The engine is toast, I can turn it 3/4 of a revolution by hand and it locks.

I pulled the engine out today, and soon as I can get it on a stand I'll tear it
down to find out how bad it is. ( I'm sure it's gone )

I'll try to get pix and figure out how to post 'em here.

Do I think it was caused by operator?, yes. Was it me? no.
As I said before I think it had been started with ether, ok, so maybe they
tossed a cup of diesel fuel into the intake trying to get it to start like a
gasser ( I know people who would do it ) either way, the original damage
was overspeed/overcombustion related. This is definatly overspeed
damage this time.

I'm out the time for the origanal repair, guess I'l suck it up, but I'm gonna
try like hell to make this a CP deal !!!

As stated before, it came to me from another dealer, I have NO IDEA what
was done to it prior to my getting involved.

Kevin

What color was or is the truck?.........

Sounds like a bad turbo

Does your PM allow messages or reply's?

Please keep us informed. Nick

I was reading and first thought over run down hill?
maybe had aftermarket exhaust brakes.another dealer kicked them out and the owner removed all aftermarket stuff. We had a detroit 2 stroke run away from us at school. If anyone has had a diesel run on you it put you in front of your maker real quick. They suck so dam much oil will make it run. Seen a diesel run on its oil until the crank case is empty.

So lets think. You repair it all is well. for awhile. and then it runs away. Starter fluid I would think would evaporaite. From broke time to fix time.I would say anything may have been spraied into the intake. My guess would be the easy way. filter box. depending on how much.
WD-40? all may have gone into intercooler! collected and sucked out after the fact. We all know the look of oil!
Brake Clean?
Did the other dealer try to start it and the tech used something?
good luck.

If they dont call the motor back I will be the first to ask can I buy it?

PM me with your dealer Phone number and how to reach you.
As a fellow Gm tech I am looking for a d/max thats junk!
Got some ideas........Patrick

Which dealer.I will be in Raleigh next week I am flying in to see the Nascar race. Would like to see the motor.

DUe to the size of pix, I am adding this link to another forum to show the
picturs of the damage to this engine. click on link below.

http://nc4x4.com/messageboard/viewtopic.php?t=9891

I have the new engine at the shop now, will start reassembly process on
Monday.

The new engine is fairly complete, comes WITH injectors and all engine
sensors ( CKP, CMP. Oil Level and pressure), water pump, oil filter and
cooler installed full oil pan and rear flywheel housing.

Does NOT include, flywheel, harmonic balancer, turbo, intakes, or
exhaust manifolds. engine oil dipstick is included in package, but not
installed.

$3500 core on old engine assy.

more later, I'll get some pix of the new engine.

Kevin Edited by: Blkvoodoo

Bad turbo. Do not reuse it.


Edited by: hoot

The turbo was damaged by the valve debris coming out of the no1 cyl. I
have already got the replacement sitting on the bench.

I do not think this was the cause, the oil/fuel I found in the intercooler
was too clean to be engine oil. oil was black ( VERY ) when I drained it the
first time, and was black again after the 6 min run before it fragged the
last time. If it were the Turbo that caused this, it would have run till it ran
out of oil. TAC tends to agree with me on this.

Have you seen the charge air tubes on the newer LLY engines ? pull one
off after about 10-15k, I think you'll be surprised how much residue is in
the tubes due to the close PVC system they LLY sports as opposed to the
open system of the LB7. ( there is an SI DOC that says this is normal )

Kevin

So what the heck caused the run on condition?



Other things to look at is a commanded acceleration by the ECM or bad throttle control?



Be careful cause if the problem is not mechanical, you could be in for another runaway.


Edited by: hoot

Use a Cummins to check for electical problem. If it blows, no great loss.































Sorry Hoot. Poor attempt at humour.

I am also a class 8 mechanic, we use starting fluid all the time, for cleaning that is.http://www.dieselplace.com/forum/smileys/smiley36.gif

Hey white duramax that is just what I use starting fluid for.Great for getting any residue off of anything.Great for cleaning my tools too.http://www.dieselplace.com/forum/smileys/smiley4.gif

Cut and Paste from, http://nc4x4.com/messageboard/viewtopic.php?t=9891:





"seems the operator of the truck poured it (Diesel) into the intake in a (VAIN) attempt to get it running when it quit on the road ( due to fuel filter having never been replaced ) yep, it started and ran like hell for a few seconds, then I got it, but had no idea of the circumstances. I repaired it, ran fine, till the turbo blew the fuel sitting in the bottom of the intercooler back into the air stream and into intake causing another runaway condition. "








I Bet he won't do that again.http://www.dieselplace.com/forum/smileys/smiley36.gif



Edited by: neverenuf

I dunno...... some people never learn.

I am also a class 8 mechanic, we use starting fluid all the time, for cleaning that is.http://www.dieselplace.com/forum/smileys/smiley36.gif


Ray don't forget about blowing tires on the rim too http://www.dieselplace.com/forum/smileys/hihi.gif

OK, so what rpm did it get too before it went bang?

OK, so what rpm did it get too before it went bang?


I do not know for sure, I was on the other end of the shop waiting for the
pop.
DEFINATLY more than the 3800rpm revlimiter would allow if you just
floored the pedal.

The old timer in the shop said it sounded to him to be well in excess of
7000rpm ( look at the pix again, you will see impressions of the valves on
ALL the piston heads, the valves were floating for sure !!! )

Kevin Edited by: Blkvoodoo

Had one run away once when a fuel line cracked and was pouring fuel straight into the intake. That was one mean mutha. The suicide was complete in a minute or so.

When I was in the Army (many moons ago). When we started up the first time we always left the intake disconected from the filter box so that we could slap a clip board on it if it ran on us. I always thought it was a waste of time until one ran away. Slapped the clip board on it and it shut right down. No air, no burn.