12 VALVE HEAD BOLT TORQUE - Diesel Bombers



12 Valve 2nd Gen Dodge Cummins 94-98 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with P7100 Injection Pumps

Reply
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 01-08-2011, 03:45 PM
zdanman's Avatar
Diesel Fan
Thread Starter
 
Join Date: Jan 2011
Location: Virginia
Posts: 42
Question 12 VALVE HEAD BOLT TORQUE

Correct me if I'm wrong but I haven't seen any detailed threads on re-torquing the 12 valve head bolts down to handle more boost which I'm looking into as I build up the engine a little.

Here's a good article I read online from diesel power mags you can read here on torquing the bolts down. They give 2 methods of doing it and warn the reader of torquing the bolts down more than 120 ft-lbs.

The article states the Factory Cummins torque spec is around 115 ft-lbs.
However - my Chilton manual gives the stock torque spec as
66 ft-lbs +1/4 turn for the short head bolts and 90 ft-lbs +1/4 for the long head bolts.
So....


My Question: Does anyone else have experience with this? What's the true factory specs and what specs can you push the stock bolts too?

Thanks
Reply With Quote
  #2  
Old 01-08-2011, 04:12 PM
Flight911's Avatar
Diesel Enthusiast
 
Join Date: Dec 2010
Location: West, Tx
Posts: 162
Default 12 VALVE HEAD BOLT TORQUE

I've always replaced the head bolts cause all ur gunna wind up doing is streaching them or break them. I just pulled the head off mine cause of to much boost. I'm going back with head studs and a better head gasket. Stock bolts and gasket are designed for no more than 42psi I think
Reply With Quote
  #3  
Old 01-08-2011, 06:28 PM
monster12valve's Avatar
Diesel Bomber
 
Join Date: Sep 2009
Location: willowick, ohio
Posts: 1,355
Default

i would pull one and measure it to make sure it is not stretched already. then i would re torque them to 150 if there not stretched.... or just get some studs
Reply With Quote
The Following User Says Thank You to monster12valve For This Useful Post:
  #4  
Old 01-09-2011, 01:49 AM
Pyro690's Avatar
Diesel Wrench
 
Join Date: Jun 2009
Location: SW MN
Posts: 883
Default

How much timing and boost do you want to run?
Reply With Quote
  #5  
Old 01-09-2011, 07:47 AM
zdanman's Avatar
Diesel Fan
Thread Starter
 
Join Date: Jan 2011
Location: Virginia
Posts: 42
Default

@ Pyro690

40 psi
Reply With Quote
  #6  
Old 01-09-2011, 10:19 AM
monster12valve's Avatar
Diesel Bomber
 
Join Date: Sep 2009
Location: willowick, ohio
Posts: 1,355
Default

diesel power mag a few months back there is a truck built maximum diesel thats rund 600hp on twins and runs 11's with re-torqued stock head bolts torqued to 150 lbs. not saying i recommend this. just couldnt believe it when i was reading it.
Reply With Quote
  #7  
Old 06-01-2011, 06:35 PM
Newbie
 
Join Date: Mar 2010
Location: NV
Posts: 2
Default

Quote:
Originally Posted by monster12valve View Post
diesel power mag a few months back there is a truck built maximum diesel thats rund 600hp on twins and runs 11's with re-torqued stock head bolts torqued to 150 lbs. not saying i recommend this. just couldnt believe it when i was reading it.
...and it probably blew the headgasket the next time they started it.. haha.
Reply With Quote
  #8  
Old 06-01-2011, 11:16 PM
daveO's Avatar
Diesel Bomber
 
Join Date: May 2009
Location: Pottstown, PA
Posts: 1,030
Default

The 98 FSM says to torque all bolts to 66, then torque only the long ones to 89, and then an additional 90* on all.
Reply With Quote
  #9  
Old 06-02-2011, 12:36 AM
BRE's Avatar
BRE BRE is offline
Diesel Wrench
 
Join Date: Feb 2010
Location: Southwest Missouri
Posts: 769
Default

I would re torque to 130 if they will hold and if you can get more, go for it.
Reply With Quote
  #10  
Old 06-02-2011, 10:06 AM
dshane62's Avatar
Diesel Fan
 
Join Date: Dec 2009
Location: phoenix az.
Posts: 59
Default

i use fel-pro head gasket print-o-seal
set torque at 100
run 35 lbs boost
in 5yrs i have blown 1 gasket
i dont see how you can run studs in the back of motor due to room the only way i can get pushrods in on #6 is to remove crossmember and let tranny hit the ground
still have to fight to get them in
Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
96 12 valve oil coming out of exhaust manifold Jake12valve Diesel In Distress - Support Ticket 5 05-11-2015 12:57 AM
Head rebuild Vmason Ford Powerstroke 99-03 7.3L 1 01-22-2015 12:33 AM
6.7 head on a 05 5.9 block? Adam65 5.9 Liter CR Dodge Cummins 03-07 1 01-10-2015 12:50 AM
head stud install.. twinturbo12v 12 Valve 2nd Gen Dodge Cummins 94-98 10 12-08-2014 08:58 PM
AFC star wheel cover bolt NiNjAassasin545 12 Valve 2nd Gen Dodge Cummins 94-98 0 12-03-2014 12:40 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not 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 Off
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 04:26 PM.