Timing Chain

it is a big job, it takes a whole day and costs about $1000. Typically the chains and guides wear out on a Toyota by this mileage unless you use a top synthetic oil and change it every 3000-4000 miles

I have the same sound but is not that loud. I recently changed the guides and the chain tensioner and the sound stopped for a couple weeks and it started again. It cost me $1300. On top of that, I returned to the shop and they replaced the timing chain tensioner again and the sound stopped for the second time. I two weeks the sound returned. The sound comes around the timing chair and the tensioner. I'm starting to wonder that the chain tensioner was not installed properly.