12. COOLING SYSTEM MXU 300/250 Outer Bearing WATER PUMP SHAFT INSTALLATION Drive a new water pump shaft outer bearing into the water pump assembly from the inside. Water Pump Assembly Install the water pump shaft and shaft inner bearing into the waster pump assembly. Install the snap ring to secure the inner bearing properly. Install the dowel pins and a new gasket and then install the water pump assembly to the right crankcase cover. Tighten the twelve bolts to secure the right crankcase cover. When installing the water pump assembly, aligning the groove on the water pump shaft with the tab on the oil pump shaft. WATER PUMP/IMPELLER INSTALLATION When the mechanical seal is replaced, a new seal washer must be installed to the impeller. Install the impeller onto the water pump shaft. Torque: 1.2 kgf-m (12 Nm, 8.64 lbf-ft) The impeller has left hand threads. Install the two dowel pins and a new gasket. Install the water pump cover and tighten the four bolts. Torque: 1 kgf-m (10 Nm, 7.2 lbf-ft) 12-12