Diesel Bombers SIGN UP NOW

National Association of Diesel Motorsports
Go Back   Diesel Bombers > Dodge Cummins > 12 Valve 2nd Gen Dodge Cummins 94-98
Sign in using an external account
Register Forgot Password?
Search


Registered Members don't see these ads. Register now it's free!

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

Welcome to Diesel Bombers Forums!
Welcome to DieselBombers .com.

You are currently viewing our forums as a guest, which gives you limited access to view most discussions and access our other features. By joining our community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join the Diesel Bombers Forums community today!


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 ... JOIN NOW TO REMOVE TRACER

Reply
 
 
 
submit to reddit
 
LinkBack Thread Tools Search this Thread
  #1  
Old 01-08-2011, 02:45 PM
zdanman's Avatar
Diesel Fan

   
View Member's Albums View Member's FaceBook Profile

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

zdanman's Sig:98 12v Cummins 4x4, 2.5" Level Kit, 315/75/16 Grabber A/T2s, 90 HP 7x9 SDX Injectors, #100 Fuel Plate ff, Starwheel ff, K&N intake, Banks intake manifold, 4" full MBRP exhaust with dual turnout stacks, 17* timing, Billet input shaft, Billet TC, Custom Rebuilt 47RE, BD Adjustable Wastegate (tuned @ 35psi), TC Lockup System, Kenwood head + 600W Alpine amp + 2 x Alpine 12s, Head Bolts at 120 ft/lbs
Reply With Quote
  #2  
Old 01-08-2011, 03:12 PM
Flight911's Avatar
Diesel Enthusiast
Status: Eatin beans fartin around

   
View Member's FaceBook Profile

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, 05:28 PM
monster12valve's Avatar
Diesel Bomber
Status: must go faster!!

   
View Member's Albums

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

monster12valve's Sig:SOLD! 94' 2500 4x4, 5"mbrp to 8in black stack , bhaf, no plate, afc tune, isspro gauges, 4k gsk, 60lb VS, ATS intake manifold, tc lock up switch, 5x14's, 191 dv's, single disk, shift kit.
2007 powerstroke, cc,sb 4x4. stockish
Reply With Quote
  #4  
Old 01-09-2011, 12:49 AM
Pyro690's Avatar
Diesel Wrench
Status: F'em if they can't take a joke.

   
View Member's Albums

Default

How much timing and boost do you want to run?

Pyro690's Sig:97 Cummins 12v w/ a Dodge 2500, X cab, 4x4, NV4500, Flat bed, KDP tabbed, Autometer Boost/pyro gauges, 100 fuel plate, 4" Diamond Eye exhaust, 4GSK, SDX IIs
Reply With Quote
  #5  
Old 01-09-2011, 06:47 AM
zdanman's Avatar
Diesel Fan

   
View Member's Albums View Member's FaceBook Profile

Default

@ Pyro690

40 psi
Reply With Quote
  #6  
Old 01-09-2011, 09:19 AM
monster12valve's Avatar
Diesel Bomber
Status: must go faster!!

   
View Member's Albums

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, 05:35 PM
Newbie

   

Default

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, 10:16 PM
daveO's Avatar
Diesel Bomber

ctd12v
   
View Member's FaceBook Profile

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.

daveO's Sig:OUTLAW DB
AMSOIL dealer
*98 Cummins 12v, QC, SB, 2wd, 17* timing, DTT 47RE, HTB2 62/14, ATS Arc-Flow intake, ATS Exhaust manifold, DDP DV's, DDP Stage 4 140hp injectors, 3k GSK, #0 Plate, AFC mods, 5" Aussie stacks, gauges.
Reply With Quote
  #9  
Old 06-01-2011, 11:36 PM
BRE's Avatar
BRE BRE is offline
Diesel Wrench
Status: Save her, comfort her... Flog her!

   
View Member's Albums

Default

I would re torque to 130 if they will hold and if you can get more, go for it.

BRE's Sig:[SIGPIC][/SIGPIC]
94 2 wheel drive regular cab 12 valve-5 speed.
Little fuel, little bigger squiters, small air pusher, and just a little timing.
Dads Rig- 02 Duramax CC SB, Banks 6 gun with speed loader, Straight piped, K&n Cold air, BD high idle.
Reply With Quote
  #10  
Old 06-02-2011, 09:06 AM
dshane62's Avatar
Diesel Fan

   
View Member's Albums

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

dshane62's Sig:95 dodge 3\4 ton w\2002 cummins recon, auto to standard 5 spd. p-pump maxed .
3400 gsk, dual 5" stacks, ele. pumps, afc modded,gov. arm ,rack adjusted, 2 water sep, 2 fuel filt. extra fuel heater by coolant,full guages .Frantz by pass filter
100 gal. aux. fuel tank, runs 100% bio-diesel make myself for .79 cents a gal.
can also heat & run veggie oil. 3.54 gears rebuilt, timing +15
Reply With Quote
 
 
 
submit to reddit
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search


 
All times are GMT -5. The time now is 07:06 AM.

Copyright And Legal Notice Links Of Interest

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Diesel Bombers ® - All Content Protected Under Intellectual Property Rights Law of Registered Trademarks
Reg. No. 3,494,401 Cls. 100, 101 & 104 Under Int. Cl. 38
USE AT YOUR OWN RISK WE HOLD NO LIABILITY FOR ANY CONTENT RIGHT, WRONG OR INDIFFERENT

Protected by Copyscape Duplicate Content Check