The 3.0l doesn't have a chain it's timing belt, I would get it changed if it hasn't been done. Get the water pump done at same time. Can you try and get the video of the sound working would help to point you in the right direction
It could be the vvt cam it's been a problem on other Toyota engines, if the noise goes away after a couple of seconds. If the noise stays I would look at the idlers on the belts
Hi video doesn't work and is it at start up or all the time. There isnt anything special about the Alphard engines so no reason any good mechanic can't work on them
Yes acf50 will wash off but it's so easy to use no mess at all, it's no real pain other then the cost lol it's something I've used on my motorcycles for the last 15yrs so know it works well
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