Engine Rap 6.7 - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 27 (permalink) Old 07-10-2007, 07:58 PM Thread Starter
 
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Engine Rap 6.7

:HITFAN: :HITFAN: Hey people, 1st time in here, have new 6.7 6 speed auto, 1000 miles developed engine rap few days ago and is going to dealer tomorrow to diagnose, hope it is something minor, anyone else had similar issue? please respond......
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post #2 of 27 (permalink) Old 07-11-2007, 12:34 AM
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Good luck w/that, somone told somone who told me, so I dont knwo how true, but a guy ahd a 6.7 w/a nasty knock iin it, took it back to the dealer, tech said its a diesel supposed to be like that, and about 40 miles later something inside came apart had to replace the engine(motor didnt split open and dont knwo what came apart besides, the motor locked up/didnt run wahtever, just heard it had to be replaced, dont know how true.. Im not out here to knock the 6.7 or start a war, jsut a story I heard, maybe cummins had a few get out where something wasnt torqued right???? Like I said im not trying to bash dodge or cummins, they make good engines, one of the top diesels out there right now.

1996 Gmc k2500 4x4 6.5 turbo diesel, with mods Blew the head gasket, put all new heads, valves, injecotrs gaskets etc on the truck only to get it together and find out it had no oil pressure, and sounded horrible (pry a spun bearing). SOLD
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post #3 of 27 (permalink) Old 07-11-2007, 11:47 PM Thread Starter
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:feedback Just got truck back from dealer, no diagnose yet on engine rap, other that they can here it, they will run tests next week when i have time to drop it off..............As i was leaving the dealer and got on the highway all of a sudden the engine dropped all power and it sounded like a MAJOR mechanical failure for maybe 5 seconds, i went to pull over and it just came back........like what the f*#K, i just traded my 06 5.9 24k with no issues, i hope i did not make a mistake??????????
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post #4 of 27 (permalink) Old 07-12-2007, 02:45 AM
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good lucki, at least the dealer didnt sya" its bad fuel" or we cant hear it, its normal something liek that, hope you get it taken care of

1996 Gmc k2500 4x4 6.5 turbo diesel, with mods Blew the head gasket, put all new heads, valves, injecotrs gaskets etc on the truck only to get it together and find out it had no oil pressure, and sounded horrible (pry a spun bearing). SOLD
2007 chevrolet 2500hd Duramax loaded. GM LEMON BUYBACK
2007 Chevrolet LBZ 1 ton crew cab 8ft box
on star, xm, tow mirrors, 145 amp alt,
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post #5 of 27 (permalink) Old 07-12-2007, 07:15 PM
 
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Keep us posted

Rubicon,
Keep us posted on what you find out. My new 6.7 has 2700 miles on it now. Most of the milers were put on towing my 8,000 lb. trailer. I have not experienced any issues. That being said, reading all of these posts on this board has me listening to every rattle and clank that the truck may produce when driving down the road. I'm keeping my fingers crossed as well hoping I didn't make a mistake. Love the truck however!

JR
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post #6 of 27 (permalink) Old 07-12-2007, 07:39 PM Thread Starter
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Quote:
Originally Posted by Myguy
Rubicon,
Keep us posted on what you find out. My new 6.7 has 2700 miles on it now. Most of the milers were put on towing my 8,000 lb. trailer. I have not experienced any issues. That being said, reading all of these posts on this board has me listening to every rattle and clank that the truck may produce when driving down the road. I'm keeping my fingers crossed as well hoping I didn't make a mistake. Love the truck however!

JR
Tell me about it.......................
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post #7 of 27 (permalink) Old 07-13-2007, 12:05 AM
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I'm not sure how true but a buddy of mine's uncle works in coumbus, IN at the cummins plant and he said they halted production for 3 days on the 6.7 cause of poor cranks that failed QC:shrug: . Like i said I don't know how true it is but this wouldn't be something advertised.

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post #8 of 27 (permalink) Old 07-15-2007, 03:21 PM
 
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I wouldn't rule out that you got bad gas. My truck did the same thing once when I got $20 worth of gas from a place I'd never been just to make it to work. I noticed that the truck was running a little rougher and bogged down from stoplights. I made it to work ok, and when I went to leave I filled it up with trusted gas from my usual 'close to work' station and all was fine. Lucky I only put $20 in.

I know you're not stupid, but I would only go to 2 maybe 3 trusted places to get your diesel. Make sure it's the green "low sulfer" diesel and stick to those places unless you're out of town. The 6.7 is a great engine so far (6100 miles - first oil change yesterday) but you might have to be a little more picky with what you feed it. Hope this helps!
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post #9 of 27 (permalink) Old 07-17-2007, 01:24 AM
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Any news yet

1996 Gmc k2500 4x4 6.5 turbo diesel, with mods Blew the head gasket, put all new heads, valves, injecotrs gaskets etc on the truck only to get it together and find out it had no oil pressure, and sounded horrible (pry a spun bearing). SOLD
2007 chevrolet 2500hd Duramax loaded. GM LEMON BUYBACK
2007 Chevrolet LBZ 1 ton crew cab 8ft box
on star, xm, tow mirrors, 145 amp alt,
#23 Singles Club
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post #10 of 27 (permalink) Old 07-17-2007, 01:58 AM
 
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yea any news? i've been working on mine today. this noise is driving me nuts because i can't find it. I did try to "phase" the pump today. The book shows to rotate the engine top dead center and put the numbers on the shaft of the pump at the nine oclock position. someone told me that i could just pull the gear loose and turn the shaft 180 degrees so i did. now it is louder and more constant. maybe i went too far maybe i should have only went 20-30 percent. could it be a defective pump? i'm puzzled.:shrug:
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