What I really need is written instructions on how to replace it. I was a auto mechanic for 10 years. It's my first time working on a Lexus. If someone has written instructions on this topic, can you send them to my email. It's making a great deal of noise and it's the only car I have. Please help if you can.

 

It is a pretty in depth task and will require timing belt removal (and might as well replace while you have it removed)

If you search on the net, you can find the toyota service manuals in PDF format that will give you step by step.