My99

Fellas -

I picked up a very nice 86 a couple of weeks ago. She only has 70k original miles, and is in nice shape. That being said, there are a couple of things I've got to get fixed. One was the front rotors. I'm in the process still, and need some guidance. From a very nice write-up done by Joe Micciche, @ http://www.4x4wire.com/toyota/mainte...nd/reassembly/ , he states:

"The preload on the outer bearing has to be set. To do so, using either a 54mm or 2 1/8" socket and a torque wrench, torque the adjusting nut to 43 ft. lbs. After setting it to this torque, spin the rotor/hub assembly each direction several times, then back off on the adjusting nut until you can turn it by hand. Then set the torque wrench to 18 ft. lbs. and torque the adjusting nut.

Toyota recommends that the rotor preload should be set to 12.6 ft. lbs. This can be accomplished with a spring gauge, or a fish scale. I had neither, so I trusted that this reassembly, as prior ones had gone, would be correct based on torque values and "feel". "

I don't understand what the "rotor preload" means. He just stated to torque the large nut to 18 ft lbs. Then he says the rotor preload should be 12.6 ft.lbs. I don't know what this means... If anyone could help me out, that'd be great.

Also, whenever you pull the rotor & assembly off the axle, the "outer" wheel bearing that fits around the axle basically falls out. Well, I didn't see which way it fell off. My partner did not take note of this on his side either. Can someone tell me if it's the larger diameter or smaller diameter that should the facing inward toward the truck. The bearing is tapered, so one end is larger diameter than the other.

Thanks!
Kyle

TNRabbit

Larger diameter should go in.

The PRELOAD is measured by placing a scale on one of the lug nuts & ensuring you have 12.6 lbs necessary to "move" the wheel. You're basically ensuring there is 12.6 lbs of resistance to spinning. Understand? That's the better way to do this. The Toyota way is the best way.

My99

I understand what you're saying. Thank you.

As far as the "larger diameter" side going on first, I just want to confirm this is accurate, as it appears from the pics on an FSM I found on the internet it could be the other way around, but really can't tell.

Thanks!
Kyle

My99

Anyone else care to weigh in?

Max Volume

iTrader: (1)

The "outer" bearing goes small side in. Think about it, a tapered bearing will only go in one way.

As for the preload, I use the feel method, so im no help.

My99

Thank you! That's how it appeared on the pages of the FSM. If someone knew for certain, that would be great, but this is helpful indeed.

Thanks,
Kyle