Water Pump Replacement M70 (V12) ↗
Owner guide to the V12 water pump: spot a leaking pump by coolant on the hydraulic hose in front of the sump, or play in the shaft once the belt is off. It explains the old (bleeder screw) and new (hose nipple plus Y-hose) pump styles and the access traps on the way to a hard-to-reach pump.
Tools mentioned: Sockets, fan clutch wrench, gasket scraper, coolant