After an Old Pac run on Tuesday night, I started hearing a horrible noise which varies with engine speed. I started fearing the worst, but the car felt completely normal on the way home, apart from the noise.
When I got home I removed the alternator belt and AC belt and I discovered a relatively minor, but nonetheless very frustrating failure of this part (I have an older revision of it on my engine):
https://rossperformanceparts.com/product/toyota-3sgte-3sge-metal-jacket-harmonic-damper/
The outer metal pulley section for the AC belt only, had completely separated from the inner part of the unit. 
The damper/pulley had lasted ~7 years and copped a lot of abuse, but it's still annoying when the part cost me ~$600. 
Now I have to buy another one, and go through the hassle of removing and replacing it. At least the newer revisions of that part have a different design which should prevent the sort of failure I had, according to the owner of Ross Performance whom I talked to on the phone. 
 
Before I begin the task of removing the crank pulley, can anyone confirm whether or not I'll be able to remove it without lowering the engine at all (to clear the chassis rail)? Note that the aftermarket pulley has the same outer dimensions as the OEM one. 
If the answer is no, then how many engine/torque mounts need to be disconnected to allow the engine to drop sufficiently?
Remember that I only need to remove the crank pulley, I don't need access to the timing belt or anything like that. 

IMR22C
From memory, you can't remove the pulley without dropping an engine mount.
You might be alright just removing the D/S mount. That's what I normally do, but my other engine mounts are in need of some Sikaflex so I likely get more movement out of them.

Thanks for the info Bill!
My kirkosaurus torque mount inserts may limit the movement compared to yours, but I'll try the right side engine mount first and see what happens. 

stuka
Never ends Rob. You must have crapped yourself when you first heard the noise!

Sure did!

On another note, the recent Photobucket changes have caused all the photos in my build thread to disappear! It's going to take a lot of work to upload them all again in some other way.

Holding photoholders and websites to ransom. Mongrels.

You surely won't need to do that much. The driveshafts have movement in them so they shouldn't need to come out, exhaust also has a fair amount of flex. I would remove the gearbox mount only if required and see where that gets you.

Thanks Nathan!