Method used to torque crankshaft pulley centre bolt?
Usually with a heavy duty impact wrench (rattle gun). Put some thread-lock compound on the bolt also, as that is standard practice.
There may be at the transmission end some means of stopping the crank from turning, and then you could use a torque wrench.
Before servicing the vehicle, refer to the Precautions Section.
Disconnect the negative battery cable
Properly relieve the fuel system pressure.
Remove the alternator drive belt.
Remove the fresh air duct from the top of the radiator.
Remove the upper radiator hose.
Remove the 4 attaching nuts to the clutch fan.
Remove the 5 fan shroud bolts. Remove the fan and shroud as an assembly.
Remove the 4 splash guard mounting bolts and the splash guard.
Loosen the lock bolts and loosen the air conditioning drive belt.
Loosen the power steering lock and mounting bolt. Remove the power steering belt.
Remove the six crankshaft pulley mounting bolts and remove the pulley.
To install: reverse above
Crankshaft match marks 
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Hi Steven loots, I want to help you with your question, but I need more information from you. Can you please add details in the comment box? Do you have the torque setting? What is the problem here? Is the crankshaft rotating when you try to tighten the bolt?
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