93sc400nm

Well you guys have been great at helping me with this sc400 project...I have one last odd problem.

My rotors are knocking on the wheel studs because the wheel studs on it are aftermarket and too skinny for the rotor holes. When going into reverse or forward you can actually hear the rotors clunk against the lug studs! Very weird.

Is there a guide pin or screw which holds the rotor to the hub or not is my question. Thanks! Not particularly looking forward to replacing all the lug studs on this car haha

Blkexcoupe

iTrader: (8)

There is no guide pin that attaches the rotor to the hub. The rotor is held in place by the rim and lug nuts once they're torqued to spec. The closest thing to a guide is the center bore.

The holes for the wheel studs on the rotor are supposed to be a larger diameter of the wheel stud for heat expansion. Also, if your wheel studs were too small like you claim, then your factory lug nuts would not work. The factory wheel studs are M12x1.5 thread pitch, so that would mean someone installed M10 studs and lug nuts on your car.

If you have a knocking sound when going forward and reverse I would look into the condition of your LCA bushings before changing out the wheel studs.

93sc400nm

Awesome good to know, I will check my lower control arm bushings again...they are aftermarket lug nuts I believe...unless the factory lugs are long with a spinning spacer on the bottom...they just dont look factory but I could be wrong. Thank You

RXRodger

iTrader: (2)

Agreed, I don't think the studs are the source of your noise, I would look elsewhere. Also, as already noted I would check bushings

Blkexcoupe

iTrader: (8)

That sounds like the factory lug nut. Aftermarket lug nuts have a 60 degree taper where it seats to the rim. The stock lug nut looks like a cylinder.

Bankswood

Yep, I was getting a clunk when first starting off and it was lower control arm bushings. FYI if you need new lower control arms look for Supra lower control arms. About 1/2 the price of Lexus.