3406e shutter missing
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Magnetic379, Jan 13, 2019.
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I’m new to the forms and I’m not sure where to go for my problems. I have a 1999 kw T800 heavy spec truck, 1998 1LW cat 3406e and it’s has been nothing but a problem. Now my Bottom injector o-rings keep burning up. Fuel in oil, no coolant in oil, no fuel in coolant. All 6 lower injector o-rings burned away in under 50 miles. I had a platinum rebuild done 30k miles ago. Every fuel line, and ever part that has anything to do with the fuel system is new. Housings, pump, fuel cooler, pressure valve, hoses, all engine sensors, I mean everything. Well Except wire harness. Fuel pressure at idle is 100 psi and gradually gets as high as 140psi at wide open throttle. Turbo temp is low like 300-900 at peak, coolant temp never above 210. I have dumped at least 50k into this POS truck. Factory Peterbilt and cat specialist are s helping me with this truck. He is even stumped. Truck starts right up, but vibrates under a load. It pings and cylinders are definitely miss firing. We install new orings and it runs good for about 50 miles. Burns up a o ring and the cycle begins again. I can’t afford to spend any more money. This is my last ditch effort any direction or help is appreciated
Oxbow Thanks this. -
If its burning the o-rings I would think the copper washers are missing or not sealing in the injector cups like they should so thats where I would look.
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Last edited: Nov 17, 2019
Dino soar, Diesel Dave, Oxbow and 3 others Thank this. -
Here is a picture of my injectors. I have a terrible vibration unload, sounds like a fuel knock, ruff low rpm sputter, idles fine, low exhaust temps when acting up. The motor even after I frame just never felt like my other 550 3406e. O a back story. The truck crack number 1 injector after owning it for a month. That’s why I install platinum kit. I at this point have replaced just about everything. Could the wiring cause these problems? The truck started to run weak about 2k milage ago
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Oxbow Thanks this. -
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Oxbow Thanks this.
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Oxbow Thanks this.
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Oxbow Thanks this.
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Theres no copper washers.
The injector seats on the steel taper in the head.
Your seats In the head are warped.
You will never fix it until you have the seats machined in the head.
There was a guy on here . Truck engine machinist. He can do the seats without taking head off. It's either this or replacing the head under warrenty with another reman.
You will continue burning up the lower O-rings on your injectors till you fix this.
Combustion gas's are getting by the seats and getting past the o-ring putting air into your fuel rail making it run ruff.
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