OK, more rants on the 6.7 - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 46 (permalink) Old 05-22-2007, 08:26 AM Thread Starter
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OK, more rants on the 6.7

My nephew works for a Dodge dealership as he attempts to put himself through college. When I talked to him about my pickup, he repeatedly told me "do not let it idle". Odd that the dealer mentioned this as well (after I bought the damn thing). Turns out he has had to replace a number of engines and the common factor among all of them is too much time at idle according to the computer. He says the pistons look like mushrooms, I'm not sure what that means, but it can't be good. Anyhow, when my 6.7 runs I have to call it the nicest outfit I've ever steered, but for the most part it don't run and I would caution all of you to steer clear until Dodge gets some things figured out.
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post #2 of 46 (permalink) Old 05-23-2007, 12:44 AM
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Idleing lets the piston face get too cool and the piston rings shrink up alittle and allow blow-by. Also the turbo doesn't get enough oil pressure and that does something bad that I can't think of now. The turbo itself creates or can create a vacuum that does bad things on a engine that is made to make boost 100% of time. This was tought to me a Detriot Diesel school. So if this applies to beautiful Cummins, I'm not positive but I would think so.
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post #3 of 46 (permalink) Old 05-28-2007, 05:20 PM
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I know with bigger engines (cats, etc) letting them idle for an extended period of time allows the combustion chamber temps to cool down too much to completely burn the fuel thats in there, leading up to build up on the valves and stuff. Not a good thing. When I let my big truck idle, i bump the idle up to say 900 or so, whatever is smoothest for me to sleep, high idle keeps the engine a little warmer. Not sure if you can rig something up for your engines tho

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post #4 of 46 (permalink) Old 05-28-2007, 07:09 PM
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Oh to add the oil sprays that spray the pistons obvoiusly lose their pressure and don't get as much or any spray to the pistons causing lack of lube.
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post #5 of 46 (permalink) Old 05-28-2007, 08:57 PM
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oh great, is the 6.7 becoming the 6.0L powerstroke of the Cummins line up? I've heard of egr related issues with common rail 5.9s, but the 6.7 is making me wonder, especially people with 18 check engine lights in a month

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post #6 of 46 (permalink) Old 05-28-2007, 10:23 PM
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I wouldn't get excited yet. It's to early to tell whether it's a gonna be a bomb or a success.
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post #7 of 46 (permalink) Old 05-28-2007, 10:52 PM
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i saw one on my way home from livingston broke down with a 40 ft goosneck
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post #8 of 46 (permalink) Old 05-29-2007, 12:22 AM
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I'm sure glad I didn't buy one. Bully Dog pretty much made my mind up I didn't want one. Hopefully I'll have an 07' 5.9 soon :Thumbup: .

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post #9 of 46 (permalink) Old 05-29-2007, 01:57 AM
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[ide rather have a 5.9 than a 6.7 becauce of the emissions crap
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post #10 of 46 (permalink) Old 05-29-2007, 02:33 AM
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I think in due time all of the 3 will have problems like this because of the new emissions agenda set in place. FORD has the flame-thrower, now DODGE has the mushrooms. What will GM have?


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