Jun 08, 2015 · I need some help removing a pulley wheel from my the blower shaft on my swamp cooler. I already removed the set screw, and the wheel is definitely loose. However, I can't just pull it off as there appears to be something else installed holding the wheel to the shaft. See the photo in the link below. I circled the problem in red. Rear Of Old 3.5" Pulley: The larger 3.5" smooth supercharger idler pulley is located just above the crank shaft pulley (lowest & largest) and slightly closer to the front of the car. To remove the 3.5" SC idler pulley, place the 15mm socket and long handled wrench on the pulley's bolt.
I still say that in this case since the engine is junk and because those pulley sides are somewhat thin; cut it off, put it on a big socket and beat the shaft out with a big drift and hammer; no chance of damage that way.