You should begin water pump assembly (2AZ-FE) replacement by disconnecting the battery negative terminal while draining the engine coolant. Start the water pump assembly (2AZ-FE) replacement by using Special Service Tool: 09249-63010 to remove the front fender apron seal RH, engine under cover RH, and the fan and generator V-belt. User Special Service Tool: 09960-10010 (09962-01000, 09963-00700) for bolting removal of the 4 water pump pulley bolts before the generator assembly separation. Detach the clamp of the crankshaft position sensor from the water pump following disconnecting the wire from its clamp bracket while removing the 4 bolts and 2 nuts and clamp bracket. Follow these steps to remove the water pump from the cylinder block by carefully using a thin object between them to avoid damaging the contact surface. Apply a continuous bead of 2.2 to 2.5 mm (0.09 to 0.10 inch) in diameter seal packing material (Part No. 08826-00080 or equivalent) to the contact surface after you remove all old seal packing material remnants from its surface. Install all components within 15 minutes after applying the seal packing because delays longer than 3 minutes require removing the material then reapplying it. Install the water pump using 4 bolts and 2 nuts while torquing it to 9.0 Nm (92 kgf-cm, 80 inch lbs.). Then secure the crankshaft position sensor wire and attach its clamp to the water pump before installing the water pump pulley using Special Service Tool 09960-10010 (09962-01000, 09963-00700) and torquing 4 bolts to 26 Nm (265 kgf-cm, 19 ft. lbs.). Install the water pump pulley with Special Service Tool: 09960-10010 (09962-01000, 09963-00700) by using its 4 bolts while torquing them to a value of 26 Nm (265 kgf-cm, 19 ft. lbs.). The generator assembly and fan together with a generator V-belt are reinstalled using Special Service Tool: 09249-63010 to which engine coolant is added before reconnecting the battery negative terminal and torquing it to 5.4 Nm. The last step involves checking for leakages and then reinstalling both the engine under cover and the front fender apron seal running along the right-hand side.