Yes you need special tools. I wanted to check my valve clearences and had to buy a special tool that pushes down on the shim bucket to take the shims out that didn't meet valve clearence specs. I also bought a micrometer that measured the thickness of the shim which I had to do to determine the replacement shim to get the clearences back to specs.
I couldn't get the tools here in Kuwait so I had to wait a few months till I went on vacation and got them from a store in California and they had to order them.
These engines aren't designed like american or german engines where you can adjust valve clearences easily.
The best thing to do is research the specific job in the TSRM and it will list any special tools that you will need.
Make sure you have everything you need before you start.
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