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front rotor runout (Read 44 times)
Oct 4th, 2018 at 1:11pm

teamo1   Offline
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MA

Gender: male
Posts: 8
 
Trying to dial in the front hub rotors. All new bearings, seals, and rotors. I put a dial gauge on the rotor and I am getting about .025 runout. I moved the rotor over one lug at a time and it didn't correct it. I tried the other rotor that I bought and it seems to be the same so I believe that it is probably the hub. The other hub isn't ready yet because I ruined the seal so I have to pick up another one before trying the other side. I have two other hubs that I could restore and install new bearings. Should I go that route or try to shim what I have?
 

'75 Coupe Auto TH400
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Reply #1 - Oct 4th, 2018 at 1:49pm

68-73-77   Offline
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Newark,Delaware

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.002-.005 is what I look for, but if you have the upgraded stainless steel inserts in your caliper you can get away with a bit more. You should have almost no play in your hubs. I tighten them up all the way & back it off no more than 2 carter-key slots.
Alan Smiley
 
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Reply #2 - Oct 4th, 2018 at 2:27pm

teamo1   Offline
Newbie
MA

Gender: male
Posts: 8
 
I'll try another adjustment on the bearings and take some more readings. I don't think it's going to take that much runout off of it though. If shimming doesn't do it I may have to try another hub.
 

'75 Coupe Auto TH400
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Reply #3 - Oct 5th, 2018 at 4:55am

68-73-77   Offline
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NCRS Member 68,73,77 Corvettes
Newark,Delaware

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If that frt hub is loose your run out will be all over the place especially when the bearings are cold.
Alan Smiley
 
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Reply #4 - Oct 5th, 2018 at 3:48pm

teamo1   Offline
Newbie
MA

Gender: male
Posts: 8
 
The bearings are adjusted tight enough. I tried the hub from the other side and the runout was .004. I have a few used hubs so I am going to try a different one and see if I can get it within spec.
 

'75 Coupe Auto TH400
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