It's kind of like aligning a clutch disc. The seal around the pulley is mounted in the timing cover. You don't want it flopping and shifting around on its own, but you want to leave the timing cover loose so that you can shift it to center the seal around the pulley.
The threads are good for drawing it down. Using them certainly is better than beating on it, which can damage the thrust surfaces of your main bearings, though a light judicious tap wouldn't hurt any.
I've never been able to get one off without heat. It takes a lot less to got it back on and I've just always found the job goes better having heated it.
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Today's Featured Article - Product Review: Electronic Ignition - by Staff. Oil, for example has come a long way in the last 50 years and I don't use anything but the latest API grade available. I've heard the arguments for non-detergent oils but would never trade it for today's formulations. Paint is another, the modern acrylic enamels are great for resistance to grease and fuel stains, retaining their shine and they last forever; unlike enamels and lacquers . Still another is the alternator. No doubt using the original generator keeps the tractor pure, but for thos
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