Engine/Transmission (1994 - 1998) ARP Head Studs Retorque????'s

[Sandifer]

Does everyone else retorque in a line pattern? And when you retorque do you loosen them then retorque to said torque?

 

[Signal73]

Yep, loosen them up first and re apply moly. I ran them each time with the cummins pattern. either way is good I suppose for retourque's, but the inital should be cummins pattern.

 

[Forrest Nearing]

initial should always be in Cummins spec pattern... and if you increase torque, it should be in pattern... but re-torques can be done in line

 

[Highfinance97]

Yep, loosen them up first

Why do want to loosen them?? and obviously one at a time right??





Michael

 

[Signal73]

Defenetly one at a time. You need to loosen them to re apply moly to the washers and nut base. Also you will get a more accurate torque measurement then if you were just to hit them all while they were tight.....

 

[CumminsPower98]

If you try to re-torque them to the same value while still tight it will take more to overcome the standing friction thus the need to loosen first. If you were going to be adding a considerably higher torque number then you could start out with them tight. Also when it's getting close to tight it's best to try to get it all in one motion because if you stop when it's close and try to start again you have to again overcome the standing friction, which could result in a lower torque number. I don't know if I'm making myself clear or not, I'm not great at describing things but hope this helps.

 

[Forrest Nearing]

this is absolutely correct, you want to be "approaching" the torque value when you hit it... if your shooting for 120 and you're coming around and hit say 110-115 and stop, your wrench may click when you get back on it.

 

[Timebomb]

Defenetly one at a time. You need to loosen them to re apply moly to the washers and nut base. Also you will get a more accurate torque measurement then if you were just to hit them all while they were tight.....

On this note the stud will "Set" thats what ARP calls it. I torqued all mine to 120 then without loosening them atempted to retorque to 130 they clicked. So yes it is good to loosen one at a time apply molly lube and retorque.

 

[Sandifer]

Is there an online site that would show the cummins pattern for tightening the head studs? Gotta get some moly too.

 

[Signal73]

from looking at the front of the engine it goes like this:





23 24

19 20

15 16

11 12

7 8

3 4

2 1

6 5

10 9

14 13

18 17

22 21

26 25

 

[EHarvey]

Why do want to loosen them?? and obviously one at a time right??





Michael

hmmmmmmmmmm good to know lol

 

[Sandifer]

thanks Signal.

 

[biggy238]

Notice the clockwise spiral outward of the torque sequence numbers. MOST heads (if not all) torque in that same fashion. Start nearest the center of the head and spiral outward.







Oh yeah, I want to thank you all. It took a few days but this is the kind of thread I wanted to read about the subject.