The crankshaft is the the one that has the bottom pulley that that drives both of the accessory belts. If you have the pulley off already, you will need to put the nut back on to turn the crankshaft for adjustment. It also is the bottom pulley for the timing belt. Sorry no pic, but hope this helps ...

Hi folks, new to the forum here, and a little confused. I'm helping a friend with his V70 xc that had the TB tensioner give out on him as he was pulling out of his driveway. Working on lining up the pulleys for TB, and he tells me that the 'W's scribed on the cam pulleys are the timing marks. I don ...