Cadillac 12575412 Engine Crankshaft FLYWHEEL

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To remove the transmission, check components such as oil seals and replace them if necessary. For manual transmission models, remove the clutch and check or replace the clutch components and release bearing. Make alignment marks on the flywheel and crankshaft to simplify replacement, as the bolt holes are slightly offset. Hold the flywheel/driveplate stationary while unscrewing the bolts; use a transmission mounting bolt and a wide-bladed screwdriver to prevent turning. Loosen and remove each bolt, ensuring new replacements are obtained for reassembly due to the severe stresses they endure. Carefully remove the retainer and flywheel, noting its weight. Clean the flywheel to remove grease and oil, inspecting for cracks, rivet grooves, burned areas, and score marks, with light scoring removable using emery cloth. Check for cracked and broken ring gear teeth and lay the flywheel on a flat surface to check for warpage. Clean and inspect the mating surfaces of the flywheel and crankshaft, replacing the oil seal if leaking, especially in high-mileage engines. While the flywheel is removed, clean its inboard face and the sensor's tip, ensuring the sensor is securely fastened. Install the flywheel/driveplate on the crankshaft, aligning all bolt holes using the marks made during removal, then install the retainer and new bolts, tightening them by hand. Lock the flywheel using the disassembly method, tightening the new bolts in a diagonal sequence to the specified torque in two or three stages. The remainder of the installation follows the reverse of the removal process.