12. COOLING SYSTEM GRAND DINK 125/150 Remove the four bolts and the water pump Bolts Water Pump Cover cover, gasket and 2 dowel pins. Impeller (Left Hand Threads) Remove the water pump impeller. The impeller has left hand threads. Inspect the mechanical (water) seal and seal Mechanical Seal Seal Washer (Porcelain) washer for wear or damage. The mechanical seal and seal washer must be replace as a set. Impeller 12-10