It's been over a year since OP wrote a post on this forum. Perhaps try a private message? I'm still interested in this topic.
Welp today is your day because I have an answer!
Yes, the alternator pulley can be removed without removing the alternator. I just got everything wrapped up.
Tools you will need:
-OEM tools part no. 27261 (the amazon link OP posted has the correct sizes)
-Pulley, Alternator W/Clutch (Toyota OEM Part Number: 27415-0W131)
-19 mm open ended wrench (the longer the better)
-10mm socket/wrench
Tips:
-watch the Gates training video link in this thread! It helps to figure out how to use the tool (although its pretty straightforward)
-the 19 mm open ended wrench will turn COUNTER-CLOCK WISE as you hold the 10mm OEM tool in place.
-make sear all sockets and OEM tool fittings are properly fitted and snug before wrenching, it seems like the metal of the bearing housing is aluminum and can strip which can be a headache. I was getting close to that point of the tool slipping and not holding the pulley in place while wrenching...make sure everything is seated properly.
-disconnect the negative terminal on battery
After wrapping it up the noise is 90% eliminated. There is a faint bearing noise and I believe that is due to the drive-end-frame-bearing located inside the alternator. I've been through too many water crossings and mud pits to where my alternator is caked with mud.
