Well, after almost 6 years of ownership, as well as membership on this site, I've decided to give back. I haven't seen a how to for replacing the front wheel hub assembly on the 350Z, so I decided to write one up since I was replacing mine.
This was done on my car, which is a 2003 Track model. Steps might be different on cars not equipped with the Brembo brakes.
Additionally, I take no responsibility for what happens to your car if you try to do this on your own. This i merely a documentation of my experience replacing the wheel hub assembly on my car.
Parts and Tools Needed:
torque wrench (if you want to be accurate when re-tightening bolts)
small extension for socket wrench
zip ties or string or wire
a breaker bar/cheater bar of some sort is helpful
Loosen the lug nuts on the wheel/s where you will be replacing the hub assembly.
Jack up the car and place jack stands. I have to drive onto a block of wood to get my car high enough to fit the jack under the side skirt. (Note: if you are unsure of where to jack up the car from or where to place the jack stands, there is a picture in the service manual, and also floating around on this site.)
Completely loosen lug nuts and remove wheel.
Remove the two 22mm bolts holding the brake caliper in place. I found it difficult to remove with just my 1/2" drive socket wrench, so I used a pipe on the wrench to provide extra leverage.
To provide some support for the brake caliper, I zip-tied it to the top of the control arm.
Remove the rotor from the hub. Some people have claimed to have trouble removing their rotor, but mine slide right off. If you have trouble I recommend figuring out a solution with a 2x4 and mallet.
Remove the four 17mm bolts that hold the hub assembly in place. They are located behind the hub assembly. One of the bolts is difficult to access due to the steering knuckle being in the way. I jacked up the suspension a bit to try and make it easier, but am not really sure if it made any difference. You don't need to actually remove the bolt completely anyway so it's not a problem.
The brake shield will also come off, so note its orientation.
Caution: When removing the four bolts, be careful not to have the hub assembly fall off the car and onto your foot while wearing sandals. The hub assembly is pretty heavy, and will hurt your foot (ask me how I know!
Put it all back together with the new hub assembly!
Torque specs are:
Four 17mm bolts holding hub assembly: 78.5-98.1nm/ 58-72ft-lb
Two 22mm bolts holding brake caliper: 151-152nm/ 111.4-112.1lb-ft
Take car for test drive and enjoy improved driving.
Kick back and enjoy a brewsky of your choice (of in my case what was given to me for free... thanks w0ady!)
The car drives soooo much better now that I replaced the faulty/worn bearing. Before I had serious noise coming from that bearing. It sounded like my friends lifted truck on off roading tires, but worse.
My brake pedal also feels much improved. The engagement of the brakes is way more solid and the pedal is much less mushy.
Overall, this is a pretty simple DIY. This was my first time replacing a part like this, and it took me about 45 min to replace the front passenger side assembly, start to finish. If you can lift the car and remove the wheel, you should be able to replace the hub assembly.