Problems in the 6.7?????????? - Diesel Truck Forum - TheDieselGarage.com
Thread Details Posted by thejdman04, this thread has received 34 replies and been viewed 4827 times.

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 35 (permalink) Old 03-19-2007, 01:06 AM Thread Starter
Senior Member
 
Join Date: Jan 2007
Posts: 3,754
Points: 41,077
Thanks: 0
Thanked 4 Times in 4 Posts
Problems in the 6.7??????????

I AM NOT TRYING TO START A BRAND BASHING WAR. Dont turn this thread into one. I was talking to a buddy of mine who works for chrysler. He has not even seen one of the new 6.7 cummins, but he said FROM WHAT HE HAS BEEN HEARING, from other shops etc, the new cummins have been having cam bearing failures. I asked why, he said again from what he hears, its because possibly the longer stroke bore, but they are not real sure at this point. Anyone else hear this??? I know its could all be a rumor, certainly hear say. Just curious. I think cummins motors are awsome, and the 5.9 was a great motor, jsut wondering if anyone else had heard this,making the 6.7 a dud motor. Even if they are having problems, I am sure w/dpf's etc cummins engineers are watching all motors and any failures very closely and coming up w/solutions, jsut wondering if anyone else has heard this.

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
thejdman04 is offline  
Sponsored Links
Advertisement
 
post #2 of 35 (permalink) Old 03-19-2007, 01:11 AM
 
Join Date: Jun 2005
Posts: 2,352
Points: 19,229
Thanks: 0
Thanked 0 Times in 0 Posts
the stroke on the 5.9 to the 6.7 hasnt changed that i am aware of, but the bore is larger, how much larger im not sure. i have no clue why this would cause more stress on anything that the other motor had. The only thing different about the 6.7 from the 5.9 is the larger bore, variable geometry turbocharger, and a couple other small things. the highest load point in an engine is the cam, so if there is no lubrication that can lead to serious damage.
Deezle1 is offline  
post #3 of 35 (permalink) Old 03-19-2007, 01:37 AM
 
Join Date: Jan 2007
Posts: 119
Points: 384
Thanks: 0
Thanked 0 Times in 0 Posts
probably a rumor, I've got a 6.7 so I hope so, I am watching 6 different diesel sites reading everything out there on this new engine and have not heard of anything that bad yet, just a few codes coming up but not serious, the worst thing seems to be poor fuel economy.
gen4 is offline  
post #4 of 35 (permalink) Old 03-19-2007, 02:34 AM
Mafia #42
 
HighTQCummins's Avatar
 
Join Date: Dec 2008
Location: Valley Forge PA/West Long Branch NJ (college)
Posts: 3,646
Points: 27,826
Thanks: 3
Thanked 40 Times in 34 Posts
Garage
Send a message via AIM to HighTQCummins
how bad is the MPG?

Hank

TDG and the Mafia lives on

TDG B.O.M.B. Squad #5

My Truck:2007 Toyota Tacoma V6 4x4

Diesel is in my blood, I guess you can call it a disease, sadly there is no cure for it, it's my cross I must carry
HighTQCummins is offline  
post #5 of 35 (permalink) Old 03-19-2007, 04:08 AM
 
Join Date: Jan 2007
Posts: 119
Points: 384
Thanks: 0
Thanked 0 Times in 0 Posts
My 07 is not in service yet, but everyone is saying 10 to 12 mpg across the board, auto, stick, towing, empty. my 95 only gets 11 so it's no big shock to me, but it will be to the guys getting close to 20 mpg now with their 5.9's.
The computer on mine says 11.5 with the little driving I've done.
gen4 is offline  
post #6 of 35 (permalink) Old 03-19-2007, 03:41 PM
 
Join Date: Dec 2008
Posts: 2,189
Points: 45,563
Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by Deezle1
the stroke on the 5.9 to the 6.7 hasnt changed that i am aware of, but the bore is larger, how much larger im not sure. i have no clue why this would cause more stress on anything that the other motor had. The only thing different about the 6.7 from the 5.9 is the larger bore, variable geometry turbocharger, and a couple other small things. the highest load point in an engine is the cam, so if there is no lubrication that can lead to serious damage.

The block was strengthened. To add durability and reduce sound. It's probably the best engine block a Dodge Ram has ever had. 12 MPG is pretty high considering the engines aren't even broken in and have EGR valves. I think the most empressive MPG are yet to be had. If someone can figure out a way to get rid of the EGR, intake, and exhaust emissions features and still make the engine function properly we should see some of the best MPG seen.
Smokem is offline  
post #7 of 35 (permalink) Old 03-19-2007, 06:49 PM
Senior Member
 
Join Date: May 2005
Posts: 706
Points: 1,298
Thanks: 0
Thanked 1 Time in 1 Post
Ive heard rumors too,but not of cam bearings,but scuffed pistons on the 6.7

2000 Dodge CTD 2500 4x4,Qcab SWB, 4.10 LSD,PDR cam,PDR twins,DonM 6,Edge Drag Comp,RASP fuel system,DTT trans,Blizzard 810,Sidewing plow,Trynex Vp8000,Sunnybrook 3310
John DiMartino is offline  
post #8 of 35 (permalink) Old 03-19-2007, 11:37 PM Thread Starter
Senior Member
Threadstarter
 
Join Date: Jan 2007
Posts: 3,754
Points: 41,077
Thanks: 0
Thanked 4 Times in 4 Posts
I figured pry ar umor, but thought id ask. Thanks to everyone for not making this a huge brand bashing contest, seems to happen whenever you mention any brand and problems. They all have their quirks and issues.

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
thejdman04 is offline  
post #9 of 35 (permalink) Old 03-20-2007, 01:12 AM
 
Join Date: May 2006
Posts: 223
Points: 3,253
Thanks: 0
Thanked 0 Times in 0 Posts
my dad's has close to 2500 miles on it, mpg has jumped from 10 to almost 14 now. it's a stick w/3.73 gears
jackedupF350 is offline  
post #10 of 35 (permalink) Old 03-20-2007, 01:29 AM
Mafia member 46
 
Join Date: May 2005
Posts: 555
Points: 1,719
Thanks: 1
Thanked 3 Times in 3 Posts
Quote:
Originally Posted by Deezle1
the stroke on the 5.9 to the 6.7 hasnt changed that i am aware of, but the bore is larger, how much larger im not sure. i have no clue why this would cause more stress on anything that the other motor had. The only thing different about the 6.7 from the 5.9 is the larger bore, variable geometry turbocharger, and a couple other small things. the highest load point in an engine is the cam, so if there is no lubrication that can lead to serious damage.

THe bore AND stroke has been increased on the 6.7.

Current: '07.5 2500 QC/SB ETJ/68RFE, 4x4, Fabtech 6" lift, KMC XD "Diesel" 20x10 wheels, Pro Comp X all terrain 37x13.5R20 tires, BDog P Pup AFE, MegacannonII, H&S Gen 1 DPF Delete, EGR unplugged. Dynoed 361hp/677tq 20090220
SOLD!'03.5 3500 SRW QC Dynoed 2/11/06 457hp/1002tq
Scrappy is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Diesel Truck Forum - TheDieselGarage.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome