Engine/Transmission (1994 - 1998) runaway

[HALLAS]

Installed my brand new holset hx55 secondary and took it for a ride and noticed a little smoke parked in front of my shop and noticed the rpm up around 1200 when i parked turned the key off and the truck did not shut off it kind of shocked me with in a spit second it berried the tach i tried to put it in gear but when the clutch exploded and started hitting hitting the floor I jump out and ran untill it locked up destroyed the trans, clucth,flywheel and the engine I pulled of the intake to the hx55 and it was loaded with oil ,seems like the new hx was pumping oil into the motor i was so discusted i left the shop I will post over the weekend

 

[Extreme1]

Ouch, sorry to hear that. I hope it turns out to not be as bad as it sounds.

 

[TXDSLSHOP]

Sorry to hear that this is two in the last couple weeks I've heard of. http://turbodieselregister.com/forums/showthread.php?s=&threadid=92027

 

[krs]

Hmm, two new turbos - two runaway engines.

 

[HALLAS]

I am going to tear in to it this weekend. I am going to hook up my new holset on a other truck not pipe it in just run it with oil and exhaust to make sure it was the turbo I will try to get some picks and post them soon

 

[DMC]

Hallas:



Sorry to hear about the demise of your motor. If you weren't so far away, I'd offer to give you a hand with the overhaul. I'd like to take one of these apart someday.



Good Luck



Don

 

[HALLAS]

Thank guys for your concern I have two more engines and was kind of waiting for this one to blow by pushing it hard but I think it bad that a new holset would leak from the compresser housing after 15 minutes of running I also know it was not oil left from before because i drove the truck with just the hx35 untill my 55 came in and i just warm up the truck and took if and easy ride just warm it . It is the first time i ever saw a clutch fly trough the bell housing and over a 100ft away. I take to maddog he said he has seen a air intake throttle plate to shut it down If any one has some info on this It would really help

 

[Forrest Nearing]

note to self: hook up a CO2 fogger system







Forrest

 

[bighammer]

Sorry to hear of yours as well as Chris' having a runaway episode. Pretty scary stuff. I guess yours sort of settles the "well why didn't you just dump the clutch to kill it" comments.



I think I might have had a similar experience had I not figured out my mistake. As I was swapping turbos on my old truck, I was interupted (can't remember what now ) but then went back to it, picking up where I had left off-- Bolting it on. I got everything on and was cleaning up and about ready to fire it up when I saw a plastic plug that had been on the oil supply line. I couldn't find the plug for the drain though. (thought I'd use em on the old turbo to keep it clean) I looked everywhere and remembered the interuption and decided to plull off the drain line so I could check it. (just so I would feel better) THE PLUG WAS STILL THERE



Would the oil pressure with no place to drain, blow out the seal and create an engine runaway?

 

[britannic]

It's certainly a possibility, I had a restricted return/drain line on my turbo and fortunately it pumped oil out of the exhaust side seal, draining the sump in the process. I was able to shut the engine down just as the oil pressure warning started flickering.

Originally posted by bighammer

Sorry to hear of yours as well as Chris' having a runaway episode. Pretty scary stuff. I guess yours sort of settles the "well why didn't you just dump the clutch to kill it" comments.



I think I might have had a similar experience had I not figured out my mistake. As I was swapping turbos on my old truck, I was interupted (can't remember what now ) but then went back to it, picking up where I had left off-- Bolting it on. I got everything on and was cleaning up and about ready to fire it up when I saw a plastic plug that had been on the oil supply line. I couldn't find the plug for the drain though. (thought I'd use em on the old turbo to keep it clean) I looked everywhere and remembered the interuption and decided to plull off the drain line so I could check it. (just so I would feel better) THE PLUG WAS STILL THERE



Would the oil pressure with no place to drain, blow out the seal and create an engine runaway?

 

[cartman]

hi hallas sorry to hear about your engine but at least you wernt hurt see if you can get some pics of the engine wile you tear it down. i have been around a few that have runaway not ctd, other engines due to different reasons but i was able to shut them down by blocking the air off to the engine.

good luck with yours

 

[HALLAS]

the drain can cause this but i made sure my was open because i had a turbo fail so i checked the return flow out at idle when i first started it lucky it didnt run away when my head was inchs from the bellhousing. It went from idle to mach 1 in split second even on its best day the truck could rev this quick I don,t think i would have had time to even pull a lever or hit a button before the clutch was hitting the floor. With the damage aside this was one of the wildest this i had ever seen

 

[R.ebel]

HALLAS,

I'd like to send out my condolences. Man what a bummer!



"It is the first time i ever saw a clutch fly trough the bell housing and over a 100ft away. "

 

[FreeBMW]

Holy crap Mike!!!! Glad you werent hurt! Between the sparks on the dyno & this your truck scares me! . Best of luck getting it back on the road quick!

 

[JDailey]

You can't panic in a situation like this. You should invest in a guillotene. It will save you alot of money and prevent someone from getting hurt. BTW-what kind of clutch were you running??

 

[FreeBMW]

I belive Mike had a TST clutch.

 

[britannic]

I found this at: . High Tech Turbo



TURBOCHARGER TROUBLESHOOTING



The most common turbo complaint is one of smoking, burning oil or "blowing oil".



Before you condem your turbo, consider the fact that even a good turbo will leak oil given certain circumstances.



Here are 4 areas to look at:



A restricted air inlet.



A restricted exhaust.



A "physical" restriction in the oil drain away from the turbocharger.



An "effective" restriction to the oil drain away from the turbo such as crankcase ventilation problems or anything that can cause excessive crankcase pressure... . like worn piston rings.



Oil must drain away from the turbo faster than the oil is being fed to it. Consider the possibility that excessive oil pressure/volume might be being fed to the turbo causing the bearing housing to be flooded with oil and causing the turbo to leak.



Turbochargers won't actually "blow a seal". The "seal" on the exhaust side is usually a simple "piston ring" with a small ring gap. The "seal" on the compressor side is either the same style or it is a more positive "carbon seal" similar to an air conditioner compressor seal or a water pump seal.



The reason most turbos blow oil (assuming there aren't any exterior causes) is because the bearings (usually simple full-floating bronze bushings) have failed and thereby ruined the seal surfaces.



Turbo "bearings" often fail due to lack of lubrication or dirty oil. Be sure to ensure an adaquate supply of clean engine oil for your turbo.