Alternative crank pulley tightening method

[urq20v]

I have had the head off my RR urquattro to fit a new head gasket and cambelt and am now ready to torque up the crank pulley/harmonic balancer bolt. 450nm of torque is way beyond the maximum of my torque wrench and I don't have access to a larger one. I could fabricate a torque extender but I think my torque wrench would break in this situation.
As an alternative method of torquing up the bolt I have read that Audi issued a bulletin 10/93 for the ABY/AAN stating that 150nm + 180 degrees was acceptable. Since the RR and ABY/AAN bolt is the same part number, would this method be OK for the RR? My torque wrench will do 150nm and I have a 3/4 drive socket set and long bar to turn the extra 180 degrees. I also read that this is a common method used by quite a few other manufacturers.
Has anyone else used 150nm + 180* on an RR or 3B?
Any advice would be greatly appreciated.
Rex

[AndyP]

I've tried this before but never managed to get to 180°, despite a 3/4" breaker bar and a long extension! Never had it come loose either though

[merlin's S4]

I used that method on my AAN. No problems so far.

[s2dk]

Used loctite and a 1" impact tool
Its not going Anywere ��

[domas]

Used loctite and a 1" impact tool
Its not going Anywere ��

Using impacts can result in shattered crank gears.

[LHD_Kid]

Used loctite and a 1" impact tool
Its not going Anywere ��

Did you use an impact gun to tighten it????

We know it isn't good practice to use a gun as this is what likely damages the key on the pulley...

[s2dk]

Im allso using terrys cranck sprocket

Never had Any problems with it
Or with usining inpact guns to tighten Them

[Bowie69]

If using chef's pulley, then it is billet, whereas the OE ones are cast, then machined. Billet won't fracture, unlike cast in that situation, but I would still get it really well seated before attacking it with a gun.

I made a crank locking tool, and have a loooong 3/4" drive bar, know my bodyweight and where to place it on the bar to get the right torque

[Error404]

450nm for me - my 75kg body weight on a 600mm breaker bar - job done

[Bowie69]

If you wanted to get all technical about it, get yourself a spring balance, and some strong arm muscles

[LHD_Kid]

450nm for me - my 75kg body weight on a 600mm breaker bar - job done

75kg... and I'm dating a 23 yr old supermodel...

[domas]

450nm for me - my 75kg body weight on a 600mm breaker bar - job done

am i plain wrong or you are supposed to use 6 meter long breaker bar in this case to achieve needed torque?

600mm is 0.6 of a meter...

[LHD_Kid]

am i plain wrong or you are supposed to use 6 meter long breaker bar in this case to achieve needed torque?

600mm is 0.6 of a meter...

τ = F x r

Symbols

τ = Torque
F = Force
r = Lever Arm Length

75kg @ 60cm = 441.29925 Nm

[domas]

τ = F x r

Symbols

τ = Torque
F = Force
r = Lever Arm Length

75kg @ 60cm = 441.29925 Nm

I agree with everything apart from the fact that you use centimeters where you are supposed to use meters.
---
wait what.

it is more like 75*~10*0.6M

**** never been so wrong in my life.

[Bowie69]

Weird, was sure I wrote a reply to this....

1Kg = 9.8N, so...

75Kg * 9.8 * 0.6m = 441Nm.