There are six standard ways to hold pulleys on shafts: axial bolts, grub screws, pinching collars, tapers, tapered keys (gib-head keys) and press fits. You should be able to see the crankshaft above the pulley to verify it is the same diameter as below the pulley: if it is, there is no taper. You should also be able to see whether there is a grub screw or a gib-head key. It does not look as if there is a pinching collar (tapered collar, pulled into the gap between shaft and pulley by a nut against the pulley) but check above the pulley as well. If it has none of the other retention methods, it must be one of two things: a press fit, which means you have to remove it with a gear puller; or retained by an axial bolt, tapped into the crankshaft's Power Take Off shaft. The crankshaft looks a bit messed up and abraded in the picture, so it might be a hassle to get it off. See if you can get some penetrating oil to soak in between the pulley and the crankshaft.
Last edited by grumpy; 30/04/14 08:13 PM. Reason: Add sixth alternative
