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Head Stud Install Question

LorenS
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LorenS

LorenS

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I plan to install my new injectors soon and was wondering if that would be a good time to install head studs.  Can a guy loosen all 26 bolts, then install the studs 'finger tight' one at a time without worrying about the head shifting or otherwise affecting the head gasket?

Or, is it recommended to completely remove the cylinder head and install new gasket when installing studs?

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hdpwipmonkey

hdpwipmonkey

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When I did mine, I pulled a bolt out put in the stud then put the washer and nut on and tighten it to 40 ft/lbs, waited about 30 seconds then tightened it down again to 80 ft/lbs waited again and then tightened to 125 ft/lbs then repeat with the next bolt.  Follow the picture in the kit when you pull the bolts and install the headstuds.  I retorqued after a week.

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AH64ID

AH64ID

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When I did mine I did one at at time in 3 phases to 105 lbs. When they were all done I went back around in 3 passes with about 30 minutes between at 115 then 125. I then turned the block heater on for about 6 hours and re-did them at 125 and called it good.

OEM bolt torque is about 105, so you are not increasing the torque on the gasket until all the bolts are replaced with studs.

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JHFIII

JHFIII

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I just did mine. As others have said, its a one at a time type deal. I used the glacier diesel method which is kind of a pain in the butt, but I do feel a little bit more secure about the install. 

Pro tip...grab a crosscheck paint marker so you and put a line on your stud and the nut so you can watch that your 1/4 to1/2 turn back off of the stud doesn't shift too much on you, and you can one on the nut to keep an eye on those.

20201212_220041.jpg

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JHFIII

JHFIII

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20 minutes ago, Mopar1973Man said:

Yeah when I did the mine there was no 1/4 or 1/2 turn stuff. I know the final torque was 125 foot/pounds for ARP 425 studs. 

 

 

The 1/2 turn was just how much to back the stud out once you bottom it in the block before you put the nuts on. The purpose of the mark  on the stud was to keep track of how far the stud turned back towards bottoming once you started torquing the nuts. 

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Doubletrouble

Doubletrouble

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 I have a few questions about studding the head mainly because it's been a long time since I've done one and it was not a diesel.

 Do you locktite the stud in the block?

How many head bolts are there on a 5.9 24valve?

 I know you really don't need to do studs until a certain power level is reached but, should the original bolts ever be retorqued?

 Lastly, is there any advantage to studding the head if you do not anticipate going above say 300hp?

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dripley

dripley

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I reused the head bolts on my HG replacement. Cummins says you can as long as they have stretched to much. Mine fell well within that spec. I never retorqued mine until l had to replace the gasket. As far as when studs are needed l leave that to more knowledgeable. 28 head bolts IIRC.

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AH64ID

AH64ID

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4 hours ago, Mopar1973Man said:

Yeah when I did the mine there was no 1/4 or 1/2 turn stuff. I know the final torque was 125 foot/pounds for ARP 425 studs. 

 

 

 

It's been part of the install since I did my 05 in 2011. 

1 hour ago, Doubletrouble said:

 I have a few questions about studding the head mainly because it's been a long time since I've done one and it was not a diesel.

 Do you locktite the stud in the block?

How many head bolts are there on a 5.9 24valve?

 I know you really don't need to do studs until a certain power level is reached but, should the original bolts ever be retorqued?

 Lastly, is there any advantage to studding the head if you do not anticipate going above say 300hp?

 

No locktite. 

 

Can't recall the number, it's a few thou!

 

No need to requote stock bolts, and no need for studs at 300 hp. The 6.7 uses bolts and is running 420/1075 for the MY21 motor, you're fine!

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NIsaacs

NIsaacs

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4 hours ago, dripley said:

I reused the head bolts on my HG replacement. Cummins says you can as long as they have stretched to much. Mine fell well within that spec. I never retorqued mine until l had to replace the gasket. As far as when studs are needed l leave that to more knowledgeable. 28 head bolts IIRC.

 

 

I reused mine as well, torqued to 120 lbs, with a Napa/Fel-Pro gasket. No retorque, 5 years and 100k miles ago.

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dripley

dripley

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17 minutes ago, NIsaacs said:

 

 

I reused mine as well, torqued to 120 lbs, with a Napa/Fel-Pro gasket. No retorque, 5 years and 100k miles ago.

I would have to go and find my instructions but they said to tighten in 3 sequences. The first 2 were given ft pound numbers. But 3rd was turn the bolts 90* more. So l dont really know what my final torque was. I do know that was a lot work doing that 28 times  even on the 24" breaker bar. About 60k on mine and all is still well.

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