ARP stud insall tomorrow.. help ASAP!! - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 18 (permalink) Old 02-21-2009, 07:52 AM Thread Starter
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ARP stud insall tomorrow.. help ASAP!!

After work tonight we pulled the engine out of the truck, tore it apart, switched in a set of forged rods and called it a night.

Tomorrow we will be completing the engine assembly and re-installing the engine.

As part of my build I have a set of new ARP head studs. The ARP instructions say to torque to like 80 lbs with ARP molly lube and like 106 with 30 weight oil...

I thought you had to tighten and loosen... then tighten and loosen.... and the final torque was more like 135????

Can some body please guide me!!! What is the best sequence and torque spec on new ARP head studs...

Thanks!!!
Bob

1995 Ford F350 XLT CC LB, 4X4, 12V Cummins, ZF5, D60, Sterling 10.5, 6637 air filter, 7.3L Intercooler, Autometer Cobalt Gauges. ZF6 swap soon to come
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post #2 of 18 (permalink) Old 02-21-2009, 08:07 AM
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Re: ARP stud insall tomorrow.. help ASAP!!

When I did mine I was also a bit confused. I know the type of lube does make a big difference. I wound up doing 120 with oil. They held with OEM headgaskets for 30,000 miles @ up to 50 psi boost before I finally split the block. But never had a headgasket leak. Also, if you look closely, you will find that there are 8 studs that are slightly shorter then the rest. These need to go by the injector cups so the hold downs will clear the stud when you install your injectors. I learned the hard way by installing the studs with the motor out, installed the motor, then the injectors and the the hold downs didn't fit. Then I had to find the 8 special studs with motor already installed and play musical studs what a PITA that was!!

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post #3 of 18 (permalink) Old 02-21-2009, 08:42 AM Thread Starter
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Re: ARP stud insall tomorrow.. help ASAP!!

Did you just torque to 120 in one go?? or did you do several torques to 120???

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post #4 of 18 (permalink) Old 02-21-2009, 12:39 PM
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Re: ARP stud insall tomorrow.. help ASAP!!

[QUOTE=Mr. Bob;402725]After work tonight we pulled the engine out of the truck, tore it apart, switched in a set of forged rods and called it a night.


I thought you needed to have it balanced if you went from PMR to forged?
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post #5 of 18 (permalink) Old 02-21-2009, 01:46 PM
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Re: ARP stud insall tomorrow.. help ASAP!!

Bring the studs up evenly... 65, 85, 105, 125, (I go 140)

Then, do each stud one at a time... at your final torque (again, some say 125 others say 140)... Torque, Untorque, Torque, Untorque, Torque, Untorque, Final Torque

Use whatever torque spec you are comfortable with. I use 140 all the time and I have never had a failure. Others have said that they broke studs at 125
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post #6 of 18 (permalink) Old 02-21-2009, 02:17 PM
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Re: ARP stud insall tomorrow.. help ASAP!!

mine are at either 130 or 135 dont remember that was w/ arp lube.

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post #7 of 18 (permalink) Old 02-21-2009, 04:28 PM
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Re: ARP stud insall tomorrow.. help ASAP!!

The directions call for 125 max ft-lbs. If you go more ARP won't warranty them if they stretch out. I went to 140 on my studs :)

As far as staging goes. This is what ARP said to do. First install all of them per factory spec at 95 ft-lbs. Then go straight to 125 then loosen and tighten back to 125 three times. Then go over all the studs one more time to ensure they are all the same.

You start with the outer part (exhaust manifold side) of the head and work towards the inside in rows.

Use the moly lube under the washers and nuts.
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post #8 of 18 (permalink) Old 02-21-2009, 08:22 PM
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Re: ARP stud insall tomorrow.. help ASAP!!

The reason behind the repeated tightening and loosening during initial stud installation is that the friction between the male and female threads burnishes (polishes) the contact area of the threads. This polishing leads to a more uniform friction from stud to stud, which in turn gives a more uniform clamping force across the cylinder head.
This is procedure is not necessary if you are re-using a set of studs.
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post #9 of 18 (permalink) Old 02-21-2009, 10:19 PM
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Re: ARP stud insall tomorrow.. help ASAP!!

i torqued mine to 140 also. Its a b!tch with the motor in the truck with the fuel bowl in place.

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post #10 of 18 (permalink) Old 02-22-2009, 12:32 AM
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Re: ARP stud insall tomorrow.. help ASAP!!

When we did mine, we took them to 130 loosened them then back to 130 and that was it
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