Looks like a keyed shaft into the pulley. Those things can get awfully tight. Looks like the shaft is tapered - even worse problem! I've taken some apart where the key virtually welded itself to the shaft. Had to grind it out with a Dremmel and cut off wheels. May have to get a gear puller, but be sure to be careful not to distort the pulleys or you'll be buying some new ones. Heat wrench may help. You might also get some replies about someone's favorite snake oil. Right now, I'm frustrated with them all. Ran a test on several and NONE penetrated rusted bolts more than a couple threads. Good luck.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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