Raise the vehicle and support it securely on jackstands. If equipped with a manual transaxle, remove the pressure plate and clutch disc, taking the opportunity to check or replace the clutch components and pilot bearing if necessary. For vehicles with an automatic transaxle, check and replace the front pump seal or O-ring. Use paint or a center-punch to make alignment marks on the flywheel or driveplate and crankshaft to ensure correct alignment during reinstallation. Remove the bolts securing the flywheel or driveplate to the crankshaft, and if the crankshaft turns, hold the flywheel or driveplate with a pry bar or jam a screwdriver into the ring gear teeth. Carefully remove the flywheel or driveplate from the crankshaft, supporting it while removing the last bolt due to its weight. Clean the flywheel to remove grease and oil, inspecting the surface for cracks, rivet grooves, burned areas, and score marks, with light scoring removable using emery cloth. Check for cracked or broken ring gear teeth or a loose ring gear, laying the flywheel on a flat surface to check for warpage with a straightedge. Clean and inspect the mating surfaces of the flywheel or driveplate and crankshaft, replacing the crankshaft rear seal if leaking before reinstalling. Position the flywheel or driveplate against the crankshaft, aligning the marks made during removal, and noting any alignment dowels or staggered bolt holes for correct installation. Apply thread locking compound to the bolt threads before tightening, using a screwdriver wedged into the ring gear teeth to prevent turning. Complete the installation by reversing the removal process.