Disc Runout
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Disc Runout
I have been having a pulsing hissing sound coming from the passenger front wheel.
I have stripped the unit down and found a lot of disc run out. They are pretty new slotted and dimpled discs.
After repositioning the disc 90deg I have reduced the runout to about 6 thou or 0.15mm. It this good enough?
If not is it possible to get the discs ground?
Regards
Dave
I have stripped the unit down and found a lot of disc run out. They are pretty new slotted and dimpled discs.
After repositioning the disc 90deg I have reduced the runout to about 6 thou or 0.15mm. It this good enough?
If not is it possible to get the discs ground?
Regards
Dave
1973 MGBGT
1975 MGB V8
I thought I could see the light at the end of the tunnel but it turns out it was a train comming!!
1975 MGB V8
I thought I could see the light at the end of the tunnel but it turns out it was a train comming!!
Re: Disc Runout
tetlow wrote:I have been having a pulsing hissing sound coming from the passenger front wheel.
I have stripped the unit down and found a lot of disc run out. They are pretty new slotted and dimpled discs.
After repositioning the disc 90deg I have reduced the runout to about 6 thou or 0.15mm. It this good enough?
If not is it possible to get the discs ground?
Regards
Dave
6 thou sounds pretty good to me. I guess the "proof is in the pudding"...go for a spin
tetlow wrote:I am in the process of rebuilding the front and rear suspension, removing all the Koni shocks and replacing with standard ones, and replacing the gear box with a 5 speed jobbie.
I do not want to rebuild the front hub units only to have to strip them again!!
I guess the only way to be sure if you can't drive the car is to check out the runout limit in the manual.
I used to race an F1 sidecar and spent hours moving disks round on splined shafts to get the lowest run out figure. I would have been happy with 6 thou.
Regards,
Pete
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Thanks Dave.
I had adjusted the endfloat to about zero with the shims.
I have checked all mating surfaces for burs etc but all seems OK. The hubs are nearly new.
I bit the bullet this morning and the discs are in for grinding at £12 each, which thought was not too bad.
I will update when I refit them.
Cheers
Dave.
I had adjusted the endfloat to about zero with the shims.
I have checked all mating surfaces for burs etc but all seems OK. The hubs are nearly new.
I bit the bullet this morning and the discs are in for grinding at £12 each, which thought was not too bad.
I will update when I refit them.
Cheers
Dave.
Guess what.
Just got discs back. Look great. Same problem as before.
I checked hubs and as per katanaman said they seem to be distorted.
The hubs rotate true but the lip that the discs bolt to goes up and down.
I have checked the surface and it seems OK, i.e. no lumps etc.
I will try this morning to see if my local engineers can true the hubs.
At least I know the discs are good now.
Dave
Just got discs back. Look great. Same problem as before.
I checked hubs and as per katanaman said they seem to be distorted.
The hubs rotate true but the lip that the discs bolt to goes up and down.
I have checked the surface and it seems OK, i.e. no lumps etc.
I will try this morning to see if my local engineers can true the hubs.
At least I know the discs are good now.
Dave