To remove the crankshaft pulley, first take it off and note the installation depth and orientation of the seal, ensuring the new one is installed the same way. Carefully pry the oil seal out of the cover; if a seal removal tool is unavailable, partially thread a self-tapping screw into the seal and use pliers as a lever to extract it. If replacing the seal with the timing chain cover removed, support the cover on two blocks of wood and drive the seal out from the rear using a hammer and punch, taking care not to scratch or distort the area where the seal fits to prevent leaks. For installation, apply clean engine oil or multi-purpose grease to the outer edge of the new seal and install it in the cover with the lip facing inward, using a seal driver or a large socket and hammer to drive it into place, ensuring it enters squarely and is at the correct depth. Avoid getting oil on the rubber part of the seal or the crankshaft pulley contact area, as the seal must be installed dry. Check the pulley hub surface for grooves from prolonged contact with the seal; if damaged, replace the pulley. Lubricate only the inside of the pulley hub with clean engine oil before installing the crankshaft pulley, and complete the installation by reversing the removal steps.