This video documents the investigation of a knocking sound on the right side of the engine bay, in a 2005 Toyota Corolla LE sedan with a 1.8L, 1ZZFE naturally aspirated engine. Various methods for coming to a clear diagnosis are discussed.

Using methods shown in the video, we came to the conclusion that the knocking sound was coming from failing bearings inside the water pump. We go on to show how we replaced the pump using an anterior access method by removing the alternator and sneaking the pump out the front, without having to remove the motor mount or gain entry through the right front wheel well. Details of how to remove alternator connections and water pump connections are shown. For better access you can support the engine and remove the motor mount to get better access to those two bolts at the back, which are done entirely by feel if you use the method shown.

Auto repair is inherently dangerous both to person and property, even more so when the operator is inexperienced with inadequate tools. Specifically if you fail to adequately burp the cooling system you can destroy your engine, so be sure to carefully do that. Never rely on any single source for critical facts. The information provided here is offered in good faith, for free, but with no guarantees as to accuracy or safety. Before stepping into any repair, you need to honestly assess your own experience, skill and tool set, and your willingness to accept risk.

Any misadventure you encounter if you decide to accept the risk of DIY repair is your responsibility.

Music at the end is River Meditation, by Audionautix, licensed under a Creative Commons 4.0 Attribution license
(https://creativecommons.org/licenses/...)