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3406E Question

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Old Apr 21, 2013 | 08:44 PM
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Talking 3406E Question

I know, not quite the forum for it, but I figured for fun I'd throw it out there.

Years back one of our old Freightshakers ate a valve and then passed the valve through the turbo and munched it up. Truck was just a few thousand shy of hitting the 1 million mark. Company retired it.

Since then we occasionally use it to move stuff around the yard, the blow-by is pretty stiff but we deal with it by leaving the engine fan on. Over the years the non-used fuel in this dead cylinder has slowly been filling up the crankcase and recently the old girl tried to run away (ostensibly off the excessive amount of oil/fuel in the crankcase).

Now, before doing an oil change and going through it all again, I had the idea of pulling the injector line off the dead cylinder and capping it off so as to eliminate the problem altogether. Question is, will this hurt the IP pump (or Cat equivalent) when it tries to pump fuel to an injector that isn't there, but capped off?
3406E, '94 IIRC.
 
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Old Apr 21, 2013 | 08:54 PM
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Yes it will, injection systems are positive displacement. Capping a line off will cause pressure (and heat) buildup until the pump fails or the ECU may just shut it down.
 
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Old Apr 21, 2013 | 09:54 PM
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2nd that. Liquid is incompressible. The displaced fuel would find a place to go... and it wouldn't likely do so peacefully.

You could pull the injector and leave it attached to the line, and just return the "ejected" fuel to the tank, i.e. via whatever return line system is available or a seperate line.
 
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Old Apr 21, 2013 | 10:02 PM
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Can you re-route the line into a can and drain it back into the fuel return system?
 
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Old Apr 21, 2013 | 10:11 PM
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Thanks guys, I was afraid of that.
ND, that sounds like an idea to look at. I was toying with the idea of pulling the head and replacing just the one valve, but I've never torn into one of the big Cats before and from what I can see just the head sets are pricey on 'em and I don't see the company springing for a lot of $$$ on a retired rig.
 
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Old Apr 21, 2013 | 10:25 PM
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Originally Posted by Chevy_Eater
... I don't see the company springing for a lot of $$$ on a retired rig.
Well, once you state the cost savings of saving 1/8 of the fuel used on occasional yard use...
 
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Old Apr 21, 2013 | 11:49 PM
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Is the junk turbo still on it? I saw a turbo bearing collapse on a 600hp cummins. The motor then fueled itself on the turbo oil supply and hit 8000rpm before it seized. lots of smoke and very exciting for the driver.
 
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Old Apr 21, 2013 | 11:58 PM
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Originally Posted by ozdatman
Is the junk turbo still on it? I saw a turbo bearing collapse on a 600hp cummins. The motor then fueled itself on the turbo oil supply and hit 8000rpm before it seized. lots of smoke and very exciting for the driver.
They've had that happen at the mine here (in Australia) on a few Land Cruiser 70 series turbo V8s... now they have to have fire supression systems. All that for nothing, since they're pinned at 25km/h...
 
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Old Apr 22, 2013 | 01:30 AM
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Originally Posted by NorthernDiesel
They've had that happen at the mine here (in Australia) on a few Land Cruiser 70 series turbo V8s... now they have to have fire supression systems. All that for nothing, since they're pinned at 25km/h...
Where are you in Aus? I live in Perth.
 
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Old Apr 22, 2013 | 01:44 AM
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Originally Posted by ozdatman
Where are you in Aus? I live in Perth.
Mount Isa, QLD (he says with excitement... lol!)
I'm just about done a year here on loan from a Canadian operation.

Pretty great seeing all these 80s and 90s F-Trucks all rust free, with custom boxes (sorry... trays, lol) and all. Tried to buy one, almost browned my pants at the prices... 90s trucks selling for the price of a brand new base F-150 back home!

One hell of a country!
 
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Old Apr 22, 2013 | 09:57 PM
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I thought the Echo had a fuel rail and electronic injectors? A was a straight mechanical, B was some electronics added, C was an electronically controlled injector pump and the the Echo had a computer mounted on the side of the engine that ran everything. If that's the case, just pop the valve cover and unplug the injector electrical. It's high voltage, like 90-140v so you might want to seal it somehow. If it has an injection pump, then just cut the line, clamp a hose on it and tee it into the return system. It won't have the pressure in it since there won't be an injector capping the end.
 
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