With the engine fully cooled off, remove the viscous clutch cooling fan, engine accessory belts, and crankshaft vibration damper and pulley, ensuring to mark the belts with their direction of rotation. Install the cap using the BMW special tool 11 2 383 on the end of the crankshaft, followed by the seal guide with the BMW special tool 11 2 385, making sure to align the groove with the keyway on the crankshaft. Use the oil seal puller (BMW special tool 11 2 380) by screwing in the body of the puller until it contacts the seal, then tighten the bolt in the center of the tool to draw the seal out of the cover. Coat the new seal with oil and position it in the timing chain cover, utilizing the BMW special tool 11 3 280 and the crankshaft center bolt to draw the seal in flush with the timing case cover. Reinstall the crankshaft vibration damper and pulley, and complete the installation by reversing the removal process, taking care to install the engine accessory belts and the cooling fan.