Crankshaft/ lower pulley bolt torque spec/sequence?

[Yellow03snake]

I installed an 08 damper on my 07 almost two years ago. I figured it was like any other balancer install on a normal V8. Well after noticing a belt chirp that gradually got louder I went over everything and noticed the crank bolt had loosened itself.

I cranked it back down to about 125 ft pounds and figured I just didn't tighten it enough the first time(didn't fix the belt chirp btw)

Drove the car a couple more 1000 miles and checked the bolt.....loose again!

Did some research and "heard" there is a proper torque sequence to this bolt, but I've had zero luck finding it.

Hopefully the crank is OK because I've also heard of lower pulley cars snapping off the front of the crank, one of them was missing the bolt entirely. YIKES!

Anyone know the torque specs?

 

[zporta]

Stage 1 : tighten to 90nm or 66 lb ft
Stage 2 : loosen 360 deg
Stage 3 : tighten to 50nm or 37 lb ft
Stage 4 : tighten 90 deg

 

[zporta]

Abviously these bolts are one time use. So once it taken off it needs to be replaced. Or get an arp bolt and call it a day

 

[Yellow03snake]

Stage 1 : tighten to 90nm or 66 lb ft
Stage 2 : loosen 360 deg
Stage 3 : tighten to 50nm or 37 lb ft
Stage 4 : tighten 90 deg

Really? There's no final torque spec?

 

[zporta]

This is exactly what my buddy told me. He's like a ford manual.

 

[UnleashedBeast]

and don't forget to use Red loctite!

 

[alghanim]

..any P/N for the ARP bolt..

 

[armycook1981]

If you goto vmp site he sells a bolt it's like $19:99 or something

 

[Yellow03snake]

If you goto vmp site he sells a bolt it's like $19:99 or something

It took him 3 weeks to reply about a tune, pass. I'd rather whittle one out of beachwood

 

[zporta]

Haha call JPC or lethal they might have them

 

[Riptide]

Interesting. That's the same torque sequence for the 3v 4.6.

And red loctite? For realsies? Never heard of anyone using that before.

 

[UnleashedBeast]

And red loctite? For realsies? Never heard of anyone using that before.

Or course. You rarely ever remove a crank bolt, and you don't want it to loosen on its own. If you ever do have to remove it, heat it up and you can still torque the bolt out. Sometimes, engine heat alone is enough to break red loctite free when under moderate torque.