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 and guide studs are used to lift the flywheel off. To install the flywheel, guide studs are used to align it, then bolts are tightened. To remove the crankshaft rear seal, torx screws must be removed, then the seal can be taken off. To install the new seal, it is aligned with a plastic sleeve and tooling before the torx screws are tightened in a specific sequence.