12. COOLING SYSTEM MXU 300/250 Impeller Mechanical Seal Inspect the mechanical (water) seal and seal washer for wear or damage. The mechanical seal and seal washer must be replace as a set. Seal Washer (Porcelain) WATER PUMP SHAFT REMOVAL Remove the water pump impeller. (page 12- 9) Disconnect the water hose from the right crankcase cover. Remove the twelve bolts attaching the right crankcase cover. Inner Bearing Water Pump Shaft Remove the water pump bearing snap ring from the water pump assembly. Remove the water pump shaft and inner bearing. Snap Ring 12-10