CAT C15 /6NZ trouble continues
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by truck 307, Dec 20, 2017.
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benny906, Blowcanner1975, pushbroom and 3 others Thank this.
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magoo68, Diesel Dave, Blowcanner1975 and 6 others Thank this.
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You should not have a divider valve in the lines feeding fuel to the engine. Only on the return. It bothers me that no. 3 gasket kept blowing out. Can we assume or trust that nothing happened between the time you bought the truck and received the truck? IMO you were too trusting to buy the truck and not receive it immediately. Even I wouldn't go that far. I'm not pointing blame, just saying. I will work on ecm for you today.
Call CAT at Turbotville PA. Send them by email what you have done. Years ago a top notch super well respected problem solver worked there. I THINK his name was James? Brown. At one time they had 2 people in the shop by the same name. One had a supervisor job and the other was a mechanic. You want the mechanic. I hope he still works for them or they know how to contact him. -
How come no one has mentioned injector seats. The seats in the head on a cat can warp and cause combustion gas to leak into the fuel rail. The air then gets picked up by the injectors further down the line and causes a rough running engine and the symptom this guy is describing.
There is a guy that does injectors where I live that has a special tool for cutting the seat back true.
Detroit' Don't have this issue as there injector seats in the cup.
Cat seats in the cast iron head. The cup on a cat is only there to keep oil/coolant out of the engine and fuel.
The engine will usually act up on heavy load when cylinder pressures are at there highest.
Typically they with run fine low load like in low range . Get into the high side of trans and start gouging on the throttle the spudder and rough running will appear.Last edited: Jan 4, 2018
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When this happens, doesn't middle o-ring fail and leak fuel into cylinder. Seems like it would crank a little longer, "pop" at start up and white smoke also.Thinking fuel would get a black tint from combustion gas in fuel. Swaan is totally correct, just seeing if symptoms match.
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Generally over time the bottom O ring will get destoyed. Fuel will get into the head seat area but not necessarily get into cylinder. The seats will still seal enough to stop this. Like I said it is most apparent under higher load situations when cyl pressure is high. -
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