International DT4900 Engine Knock 6

[gbubtzy]

Hi Guys,
I took my International truck with a DT4900 Engine to the dealership last month bacause of a check engine Light. 2 injectors were replaced. Last week Wednesday morning(5/16/07), the truck won't start. We towed it to the dealership. They said there was no engine oil in it. It was all in the diesel(gas) tanks. They gave me a diagnosis on Saturday (05/19/07)and suggested replacing the remaining 4 injectors or the O rings. i opted for the O rings because it was a cheaper option ($1100.00) compared to $3000.00+. On Monday morning (05/21/07), my driver picked up the truck and I travelled out of state. I got a call 4 hours later that the Engine has KNOCKED!!!. It was towed back to the dealership. I came back on Friday from my business trip and went to the dealership. They said a part failed inside the engine that was unrelated to the job they did. Replacement cost of engine $17,000.00. Could the O rings replacement in any way cause such a catastophic knock and should I get an attorney? Thanks for any suggestions.

 

[Cronik]

McDowra's description of how the system works appears to be correct:

New systems such as the HEUI (Hydraulically actuated, Electronically controlled, Unit Injector) are currently being used on several applications in all areas especially automotive. The HEUI System develops injection pressures as high as 18-24,000 psi by applying high pressure oil to the top of an intensifier piston. Since the area of the head of this piston is 7 times the area of it’s plunger a 7:1 pressure increase on the fuel beneath the plunger is achieved. By varying the oil pressure, injection rate can be controlled independently of the crank or cam. Thus injection timing, rates, and pressures are no longer dependent on camshaft position, speed or cam ramp velocity. This is all controlled by a solenoid actuated valve that determines when high pressure oil is applied to the piston.

from

http://www.dieselpage.com/art1110ds.htm

so if the seals had failed the possibility of oil bypassing them and then being injected into the combustion chamber and causing a hydraulic lock is very real going by that description.

 

[Cronik]

I got curious and found a diagram of a HEUI type injector.

http://www.tpub.com/content/constructiontractors/TM-9-2320-312-24-2/0807640100.htm

 

[Metalguy]

McDowra,
>"Thats also why you have diesel in your fuel, the orings on the injector leaked the oil (3000+ psi) into the fuel (60psi)."<

Just for clarification, I THINK you meant to say "why you have lube oil in your fuel---".

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