The document provides instructions for removing and installing a flywheel and crankshaft rear seal on a Caterpillar C7.1 engine. To remove the flywheel, the starter motor must first be removed, then bolts securing the flywheel are removed and guide studs are used to lift the flywheel off. To install the flywheel, guide studs are used to position the flywheel, then bolts are tightened to the specified torque. To remove the crankshaft rear seal, torx screws securing it must be removed. To install the new seal, it is pressed onto the crankshaft flange using a plastic sleeve, then the torx screws are tightened in the specified sequence.