What he said! 
front rotor runout
Thread Starter
Pro
Joined: Feb 2013
Posts: 572
Likes: 61
front rotor runout
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?
Last edited by teamo; Oct 4, 2018 at 04:27 PM.
Le Mans Master
Joined: Oct 2006
Posts: 7,123
Likes: 433
From: Gladstone MO
C3 of Year Finalist (appearance mods) 2019
Check the end play on the wheel bearings too- and sometimes you have to use shims to get the runout dialed in. Hobby Lobby sells brass sheets that make dandy shim stock. And cheap..
Drifting
Joined: Mar 2011
Posts: 1,347
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From: Kernersville NC
Le Mans Master
Joined: Nov 2016
Posts: 9,258
Likes: 950
From: Lake Tahoe, CA
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?
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Thread Starter
Pro
Joined: Feb 2013
Posts: 572
Likes: 61
I tried the other hub on the spindle and the runout was .004 so it looks like it is an issue with the hub mating surface. I have another used hub that I just cleaned up and painted. I'm going to try that one and see what I come up with.
Thread Starter
Pro
Joined: Feb 2013
Posts: 572
Likes: 61
I've been working on other things and have returned to finish the front suspension and brakes. The run out is still a problem on one side. I have .015 run out. I bought some .010 sheets of brass stock at the hardware store. I cut a section of sheet and put it under the low side (0 on the dial indicator). I expected to find .005 remaining on the high side but it was .008. I tried a piece of .005 shim and put it on top of the .010 expecting the run out to drop to 0 but it actually increased back to .015. I don't seem to be able to get more than a correction down to about .008. I've tried indexing the rotor with no improvement. Maybe it's time to replace that hub with a new one?
Le Mans Master
Joined: Nov 2016
Posts: 9,258
Likes: 950
From: Lake Tahoe, CA
I've been working on other things and have returned to finish the front suspension and brakes. The run out is still a problem on one side. I have .015 run out. I bought some .010 sheets of brass stock at the hardware store. I cut a section of sheet and put it under the low side (0 on the dial indicator). I expected to find .005 remaining on the high side but it was .008. I tried a piece of .005 shim and put it on top of the .010 expecting the run out to drop to 0 but it actually increased back to .015. I don't seem to be able to get more than a correction down to about .008. I've tried indexing the rotor with no improvement. Maybe it's time to replace that hub with a new one?
Here's a link: https://www.corvetteforum.com/forums...post1583201124
