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Adding head studs to a diesel #4629681
01/09/18 08:21 PM
01/09/18 08:21 PM
Joined: Nov 2009
Posts: 4,941
Houston, Texas
motor_oil_madman Offline OP
motor_oil_madman  Offline OP
Joined: Nov 2009
Posts: 4,941
Houston, Texas
I was thinking of putting head studs in my truck. I got a guy who does good work, but I'm not sure if you're supposed to do this. He said you can just remove a bolt and replace it with the stud.

Maybe he explained it wrong. Can you remove all the bolts and just put studs in and keep the same head gasket? My head gasket isn't blown, just want to do some preventative measures.


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: Adding head studs to a diesel [Re: motor_oil_madman] #4629704
01/09/18 08:32 PM
01/09/18 08:32 PM
Joined: Sep 2015
Posts: 5,839
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline
Joined: Sep 2015
Posts: 5,839
Kalifornia Kollective
Mostly I'd check the TQ on the existing bolts. New VC gasket. Any adjustments needed while I was in there. If the bolts TQ down and they were off by less than 10#, I would not worry. If one or two are off by more than 10#, THEN you think another clamping strategy ...

Now, on some engines, if you rotate the head bolts, they will weep coolant. Don't know if this is one of those engines ...

Studs are a different animal. They usually go in with a mild thread locker so they won't rotate once installed and the nuts will. But, this is all something to be discussed with your technician ...

And a lot of this has to do with the thread depth into the block deck, how much distortion the bolts cause vs studs, etc. It's not cut and dry ...


Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: Adding head studs to a diesel [Re: motor_oil_madman] #4629728
01/09/18 08:48 PM
01/09/18 08:48 PM
Joined: Dec 2013
Posts: 2,177
Fort Worth, Texas
clinebarger Offline
clinebarger  Offline
Joined: Dec 2013
Posts: 2,177
Fort Worth, Texas
You can replace them one at a time if the gasket isn't blown, IF this is a stock engine with no modifications......It's a waste of money!

On my 1997 Dodge 12 Valve running 35 PSI, TST fuel Plate, Cranked AFC Wheel......I popped the heads off 2 head bolts pulling a grade with 13,0000 pounds. Smelled coolant & limped it to a parking lot, Cleared the coolant from the bolt holes, Sent my wife to Cummins to buy 2 bolts, Torque them back down & didn't change the head gasket 'til 8 months later.

My current Duramax has 380,000 plus miles on it with stock bolts....I learned my lesson trying to tow heavy with modified engines!!!

If want to spend money on your 6.7L ISB.....Put some genuine Bosch reman Injectors in it IF it has over 150,000 on it!!!!


2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/Auto
Re: Adding head studs to a diesel [Re: motor_oil_madman] #4629741
01/09/18 08:59 PM
01/09/18 08:59 PM
Joined: Nov 2009
Posts: 4,941
Houston, Texas
motor_oil_madman Offline OP
motor_oil_madman  Offline OP
Joined: Nov 2009
Posts: 4,941
Houston, Texas
Do you have to remove head bolts/studs to replace injectors?


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: Adding head studs to a diesel [Re: clinebarger] #4629747
01/09/18 09:01 PM
01/09/18 09:01 PM
Joined: Dec 2016
Posts: 6,226
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,226
Waco, TX
Originally Posted By: clinebarger

On my 1997 Dodge 12 Valve ..................I popped the heads off 2 head bolts


That's pretty wild... never heard of that before


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Adding head studs to a diesel [Re: Linctex] #4629821
01/09/18 10:18 PM
01/09/18 10:18 PM
Joined: Dec 2013
Posts: 2,177
Fort Worth, Texas
clinebarger Offline
clinebarger  Offline
Joined: Dec 2013
Posts: 2,177
Fort Worth, Texas
Originally Posted By: Linctex
Originally Posted By: clinebarger

On my 1997 Dodge 12 Valve ..................I popped the heads off 2 head bolts


That's pretty wild... never heard of that before


If I didn't witness it....I would have a hard time believing it myself. I was pushing it really hard....Had to almost stop at the bottom of the grade & lost all momentum. I sure don't miss that NV4500!!!


2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/Auto
Re: Adding head studs to a diesel [Re: clinebarger] #4629922
01/10/18 01:16 AM
01/10/18 01:16 AM
Joined: Nov 2017
Posts: 286
North of you Idaho
KneeGrinder Offline
KneeGrinder  Offline
Joined: Nov 2017
Posts: 286
North of you Idaho
Originally Posted By: clinebarger
You can replace them one at a time if the gasket isn't blown, IF this is a stock engine with no modifications......It's a waste of money!


^^^^This

If its a Ford, the last couple near the firewall won't go without cutting clearance in the firewall.


Edit, I see your sig is a dodge.

Last edited by wwillson; 01/10/18 07:30 AM. Reason: Fix quote
Re: Adding head studs to a diesel [Re: motor_oil_madman] #4629925
01/10/18 01:20 AM
01/10/18 01:20 AM
Joined: Nov 2017
Posts: 286
North of you Idaho
KneeGrinder Offline
KneeGrinder  Offline
Joined: Nov 2017
Posts: 286
North of you Idaho
Originally Posted By: motor_oil_madman
Do you have to remove head bolts/studs to replace injectors?


No. They just have an injector clamp that holds them in the head.

Do you have some bad injectors? Common rail diesels don't need larger injectors for big increase in HP and torque. If you have injector issues, you may want to upgrade your fuel filter situation. The OEM big 3 don't set up their trucks right with filter systems. That's why the common rail injectors have issues.

Last edited by KneeGrinder; 01/10/18 01:27 AM.

08 Tribeca 82k PUP 5w30 wix
06 Accord Hybrid 131k PUP 5w20 wix
02 Chevy k3500 97k Delvac 1 esp 5w40 wix
00 F350 133k Delvac 1300 15w40 wix
Re: Adding head studs to a diesel [Re: motor_oil_madman] #4629952
01/10/18 03:37 AM
01/10/18 03:37 AM
Joined: May 2012
Posts: 5,363
Fort Lauderdale, FL
DoubleWasp Offline
DoubleWasp  Offline
Joined: May 2012
Posts: 5,363
Fort Lauderdale, FL
Yes, it's been done this way too many times to count on 6.7 engines.

Not bad to have as preventive maintenance, but hardly necessary. I would also vote for getting new injectors and a CAT filter setup first. Dropping an injector is baaaaaaaaaaaaaad news.


07 Lincoln Navigator M1 0w-40/FU
68 Charger R/T / Supercharged 440 VR1/DBL7349
07 Ram 3500 4x4 / Cummins 6.7 /DBL7349
17 Maserati GranTurismo Cabrio
Re: Adding head studs to a diesel [Re: clinebarger] #4630045
01/10/18 08:27 AM
01/10/18 08:27 AM
Joined: Apr 2008
Posts: 12,852
Onondaga County
Miller88 Offline
Miller88  Offline
Joined: Apr 2008
Posts: 12,852
Onondaga County
Originally Posted By: clinebarger
Originally Posted By: Linctex
Originally Posted By: clinebarger

On my 1997 Dodge 12 Valve ..................I popped the heads off 2 head bolts


That's pretty wild... never heard of that before


If I didn't witness it....I would have a hard time believing it myself. I was pushing it really hard....Had to almost stop at the bottom of the grade & lost all momentum. I sure don't miss that NV4500!!!



What was wrong with the NV4500?


18 Forester 2.5I 6M
00 Jeep Cherokee
01 Ford F-350 XL 4x4 5M
Re: Adding head studs to a diesel [Re: DoubleWasp] #4630071
01/10/18 09:03 AM
01/10/18 09:03 AM
Joined: Nov 2009
Posts: 4,941
Houston, Texas
motor_oil_madman Offline OP
motor_oil_madman  Offline OP
Joined: Nov 2009
Posts: 4,941
Houston, Texas
Originally Posted By: DoubleWasp
Yes, it's been done this way too many times to count on 6.7 engines.

Not bad to have as preventive maintenance, but hardly necessary. I would also vote for getting new injectors and a CAT filter setup first. Dropping an injector is baaaaaaaaaaaaaad news.


I'm at 120,000 miles and like 5300hrs. Chrysler put out an upgraded filter for this engine back in 09 i think. It filters 100 percent at 5 microns and like 95 percent at 3 microns. Still not the recommended minimum of 3 microns that Bosch recommends but pretty close.

Last edited by motor_oil_madman; 01/10/18 09:09 AM.

2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: Adding head studs to a diesel [Re: motor_oil_madman] #4630990
01/11/18 12:49 AM
01/11/18 12:49 AM
Joined: Nov 2017
Posts: 286
North of you Idaho
KneeGrinder Offline
KneeGrinder  Offline
Joined: Nov 2017
Posts: 286
North of you Idaho
I would not trust Ford, GM, or Chrysler for a fuel filter for a high pressure fuel injection system. The injectors at stock tune settings see in the range of 22,000 to 25,000 psi at the nozzle. To boot, I most certainly would not trust Bosch/Botch because it seems as if most of their common rail diesel injectors have issues.

If you are going to keep your truck long term, a good investment would be a 12 micron water separator with a lift pump followed by a 2 micron Cat filter. Using the large class 8 style truck size filters. The filters would give you almost lab quality fuel, and the lift pump will save your cp3 high pressure fuel pump. Its the small fine dirt, debris that erodes the injector ball and seats. You can probably do the job for a little over what 1 injector cost's.


08 Tribeca 82k PUP 5w30 wix
06 Accord Hybrid 131k PUP 5w20 wix
02 Chevy k3500 97k Delvac 1 esp 5w40 wix
00 F350 133k Delvac 1300 15w40 wix
Re: Adding head studs to a diesel [Re: motor_oil_madman] #4631135
01/11/18 08:58 AM
01/11/18 08:58 AM
Joined: Nov 2009
Posts: 4,941
Houston, Texas
motor_oil_madman Offline OP
motor_oil_madman  Offline OP
Joined: Nov 2009
Posts: 4,941
Houston, Texas
I don't trust the remanufactured injectors. I hear lots of problems with those. Apparently the only way to get a new set is buy a new truck.


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: Adding head studs to a diesel [Re: motor_oil_madman] #4631137
01/11/18 09:00 AM
01/11/18 09:00 AM
Joined: Nov 2009
Posts: 4,941
Houston, Texas
motor_oil_madman Offline OP
motor_oil_madman  Offline OP
Joined: Nov 2009
Posts: 4,941
Houston, Texas
It's only at 23,000 at full throttle. Then I believe that's the fuel rail, so you divide that by the number of injectors. I could be wrong about that part though.


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: Adding head studs to a diesel [Re: motor_oil_madman] #4631780
01/11/18 07:56 PM
01/11/18 07:56 PM
Joined: Dec 2013
Posts: 2,177
Fort Worth, Texas
clinebarger Offline
clinebarger  Offline
Joined: Dec 2013
Posts: 2,177
Fort Worth, Texas
Originally Posted By: motor_oil_madman
I don't trust the remanufactured injectors. I hear lots of problems with those. Apparently the only way to get a new set is buy a new truck.


I don't have issues with genuine Bosch remans, It's ALL about the install!!!! Absolutely critical to be as clean as possible. One grain of sand can ruin an injector!!

Some of the CR Dodge's I see come from other shops with misfires/hard starts after injector replacement have the "Transfer Tubes" Over or Under torqued. The others are just a dirty install.

I guess I'm glad I cut my teeth on LB7 Duramax's.....You want to talk about a JOB!!


2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/Auto
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