12. COOLING SYSTEM ATV 300/250 WATER PUMP MECHANICAL SEAL (WATER SEAL) INSPECTION Inspect the telltale hole for signs of mechanical seal coolant leakage. If the mechanical seal is leaking, remove the right crankcase cover and replace the mechanical seal. Water Pump Telltale Hole Water Pump Cover WATER PUMP/IMPELLER REMOVAL Drain the coolant. (page 3-20) Loosen the screw and disconnect the coolant inlet hose. Remove the four bolts and the water pump cover. Bolts Inlet Hose Water Pump Impeller Gasket Remove the gasket and 2 dowel pins Remove the water pump impeller, washer and seal washer (porcelain). The impeller has left hand threads. Dowel Pins 12-6