6.7L Cummins ARP Head Stud Warm Retorque Experience

[Tonybain42]

Hello everyone, I wanted to share this because when I was asking about it it was about 50/50 on weather or not doing a engine warm retorque was required for the arp 425/2000 head studs.

ARP says nothing about it in the instructions, but several people here said to hot retorque them.

I called a few shops and it was 50/50 on weather or not it was necessary.

Well, I'm very happy I did it!

While it's kind of a ***** to torque them in the first place and positioning the torque wrench is difficult it's completely worth it!!!

I have a nice digital torque wrench that displays torque as used and holds peak numbers.

I did my initial torque about 6 weeks ago and the truck has been sitting since then.

Finally today had time to let it warm up and pull it apart to do the retorque.

I had a few start moving right at 100 ft-lbs , even though ARP says 125, and I had previously torqued them all to 130 ft-lbs.

With it warm some took considerable movement to get back to 125 ft-lbs.

So I would say anyone installing these should absolutely let the engine warm up.

I did mine at 180 degrees, because I have a 180 thermostat, and re-torque them.

I mean I thought there would be slightly less torque from colt to warm from the metal expansion, but seeing that I had movement at 100 and they were torqued to 130.

That's 23 percent lower torque!

So retorque those head studs with the engine warm!

Now time to go put the valve train back on and adjust all the valves.

 0 Comment(s)

[cumminsdieselfreak]

Hello everyone, I wanted to share this because when I was asking about it it was about 50/50 on weather or not doing a engine warm retorque was required for the arp 425/2000 head studs.

ARP says nothing about it in the instructions, but several people here said to hot retorque them.

I called a few shops and it was 50/50 on weather or not it was necessary.

Well, I'm very happy I did it!

While it's kind of a ***** to torque them in the first place and positioning the torque wrench is difficult it's completely worth it!!!

I have a nice digital torque wrench that displays torque as used and holds peak numbers.

I did my initial torque about 6 weeks ago and the truck has been sitting since then.

Finally today had time to let it warm up and pull it apart to do the retorque.

I had a few start moving right at 100 ft-lbs , even though ARP says 125, and I had previously torqued them all to 130 ft-lbs.

With it warm some took considerable movement to get back to 125 ft-lbs.

So I would say anyone installing these should absolutely let the engine warm up.

I did mine at 180 degrees, because I have a 180 thermostat, and re-torque them.

I mean I thought there would be slightly less torque from colt to warm from the metal expansion, but seeing that I had movement at 100 and they were torqued to 130.

That's 23 percent lower torque!

So retorque those head studs with the engine warm!

Now time to go put the valve train back on and adjust all the valves.

This is why I personally recommend a hot retorque, glad you got them installed and don't hesitate to let me know if you need anything else!

 0 Comment(s)

[Compton]

I never had mine back out.

Not yet anyway.

When I first put the studs in (I also torqued to 130) I figured I better check later down the road to see if any had loosened.

After about 1000 miles and putting my foot in it I rechecked the studs and they were all the same.

I wonder why that is?

Some peoples back out and others don't.

Kinda odd.

I did use quite a bit of the ARP lube and when I first threaded the studs in I bottomed them out and then loosened off a quarter turn.

 0 Comment(s)

[cumminsdieselfreak]

I never had mine back out.

Not yet anyway.

When I first put the studs in (I also torqued to 130) I figured I better check later down the road to see if any had loosened.

After about 1000 miles and putting my foot in it I rechecked the studs and they were all the same.

I wonder why that is?

Some peoples back out and others don't.

Kinda odd.

I did use quite a bit of the ARP lube and when I first threaded the studs in I bottomed them out and then loosened off a quarter turn.

I'd retorque them if it were my truck.

 0 Comment(s)

[Moparriggan]

I have these to install on my 17' 6.7L.

I plan on installing them one by one I wonder if i should drive the truck with a 30% throttle or less and let the engine heat cycle a month or so then retorque the hot to 165LBS?

Suggestions?

1614034201056363441726586695997.jpg

 0 Comment(s)

[Compton]

I followed the Glacier Diesel ARP head stud install.
You have the 625s so it says 160.

https://www.google.com/url?sa=t&sour...JW-eHKa9i-MKa6

 0 Comment(s)

[Scrambler13]

I have these to install on my 17' 6.7L.

I plan on installing them one by one I wonder if i should drive the truck with a 30% throttle or less and let the engine heat cycle a month or so then retorque the hot to

1614034201056363441726586695997.jpg

The 625’s are a once and done compared to the 425’s which they say you should retorque them after a few heat cycles.

 0 Comment(s)