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Cummins Cylinder Head Line Torque Cummins Cylinder Head Line Torque
RacinDuallie
05-08-2007
Torque the head to Cummins spec
Step1- all bolts to 66 ft.lbs.
Step2- recheck all bolts.
Step3- all bolts to 89 ft.lbs.
Step4- recheck all bolts.
Step5- rotate all bolts an additional 90degrees-(bolts) if using Studs torque to-125 ft.lbs.
Check valve clearance when done.
Bring engine up to operating temperature(without driving!)
Let engine cool down to about 95degrees to begin Line Torque Procedure.

To line torque head:
Make a mark with a magic marker, so you have a reference point on top of the bolthead or nut(studs).
Then start at the front(pass. side of head) bolt/stud-nut, loosen it up, then re-torque it to 125 ft.lbs.(studs) 90ft.lbs.(bolts.)
Proceed down that line of bolt/studs, doing same thing, one at a time.

*NOTE*
If you notice more than 1/8th inch rotation of the bolt while doing last step, then you may have a bolt that has 'stretched'
You need to pull that one out and measure it with a Cummins Bolt Guide, or Bolt Stretch Indicator.

Do not forget to re-check valve clearances once procedure is done.
Intake : .010"
Exhaust : .020"


Drive truck for the next week but keep the boost psi under 30psi during this time. (crucial)
By doing this,the different heat cycles will get the head to 'settle' better.

After a weeks time has passed, do the Line Torque Procedure again. Same exact way you did the first time. Drive it again for a week. And you can get into the pedal a little bit more but don't go maxing it out just yet.

After a weeks time has passed again the head should have settled by now and you can do the last line torque procedure and you should be good to drive it HARD. (as long as you don't see any movement from your marks.)



 
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