Lexus 16100-09690 Engine Water Pump Assembly

1. Remove the engine covers, radiator support trim cover, and the inner fender splash shield on the right side. 2. Remove the drivebelt. 3. Remove the engine harness ground connector. 4. Remove the upper front engine mount bracket and the engine movement control rod. 5. Remove the rear engine mounts and insulators. 6. Remove the front engine mounts and insulators. 7. Place a floor jack with a wooden block under the engine oil pan for support and remove the front engine mounting bracket. 8. Remove both the front and rear drivebelt idler pulley assemblies. 9. Remove the bolt and the drivebelt tensioner pulley. 10. Hold the water pump pulley with a special pin-spanner wrench and remove the pulley mounting bolts. 11. Remove the coolant inlet or thermostat housing and gasket. 12. Remove the water pump mounting bolts, then remove the water pump/pulley and gasket. 13. Thoroughly clean all sealing surfaces, removing all traces of old gasket and sealer. 14. Install a new gasket to the water pump and tighten the bolts and nuts to the torque. 15. Install a new gasket and O-ring to the water inlet housing. 16. The remainder of installation is the reverse of removal. Tighten the bolts to the torque. 17. Refill the cooling system and run the engine, checking for leaks and proper operation.

Spray automotive drivebelt dressing on the belts to eliminate the belt as a possible cause of the noise.