Blindcars Posted October 13, 2014 Share Posted October 13, 2014 just curious what a maximum allowable run out if a front hub should be? Noticed that the rotir was slightly contacting the pads, then not cintacting them so i decided to investigate. Runout on the hub face showed a 5 thou variance, reinstalled rotor and hat, measured on the face of it and there was a 20 thou variance, install wheel and check off the face of the rim and was out by 50 thou. Root of problem is an egg shaped bushing on tge spindle whis is used to change the spindle size from that of a fiero to that of a pinto ( which is what the wilwood hubs fit). So what is an acceptable runout? Im thinking like 2 or 3 thousandths Thanks Leo Link to comment Share on other sites More sharing options...
Blindcars Posted October 13, 2014 Author Share Posted October 13, 2014 Ugh.. Excuse the typo's. I do know how to spell but my phone decided to change some things. Need a 2 min edit time window on posts Link to comment Share on other sites More sharing options...
Dave W Posted October 13, 2014 Share Posted October 13, 2014 The typical rotor runout tolerance verified about a 1/2" in from the dics edge is only .005" to .007" Check for some markings on the spacer which would indicate an index mark relative to the spindle? If not, sounds like a machine shop is in the future. Dave W Link to comment Share on other sites More sharing options...
coffee break Posted October 13, 2014 Share Posted October 13, 2014 Is there something that caused you to look for run out? Vibration or steering wheel wobble? Link to comment Share on other sites More sharing options...
Blindcars Posted October 13, 2014 Author Share Posted October 13, 2014 While assembling the car i spun the wheel to check out the newly assembled hub/rotor/wheel and heard the rotataing rotor hit the pads, then not hit, then hit, etc.. That pretty much said something was amiss. Looking closer i could actually see the runout changing at the rims face. Yes, Dave W, a machine shop is in the cards . Get the bushing on the spindle cured and that should locate the hub bearing correctly which likewise will get me into acceptable runout specs. Link to comment Share on other sites More sharing options...
Blindcars Posted October 14, 2014 Author Share Posted October 14, 2014 What has occupied my brain today is this aspect: the bushing in the spindle "should" only affect the rotational runout in an up and down manner due to the small egg shape of the bushing. It shouldn't make it have side to side variations. Tomorrow ill move all the hub and rotor assembly to the other side and see if the problem moves with it. If it does then ill have to dig deeper into is the race set evenly, bearing issue, or a mis machined hub. None of which i think is a possibility. Leo Link to comment Share on other sites More sharing options...
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