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Disk Hubs
https://ausmini.com/forums/viewtopic.php?f=2&t=97961		 Page 1 of 1
Author:  dimmo [ Sat Nov 17, 2018 3:00 pm ]
Post subject:  Disk Hubs
Hi guys, I have put new pre-built disc hubs on and have new CV joints, CK-BL-02, but when i put the disc and drive flange on, 8 1/4", i only have to finger tighten the nut and it all locks up. any Suggestions on this problem? TIA
Author:  hpal [ Sat Nov 17, 2018 3:11 pm ]
Post subject:  Re: Disk Hubs
I’d say at a guess they are built hubs but not set up correctly, ie too much preload. They have likely used aftermarket bearings which are hit and miss with the preload you will need to set them up properly and fit longer spacers and machine them down to get your required preload. I had to do this as well when building my hubs as one spacer was a bit short. Apparently timken bearing are better and can be put in and will have the correct preload and be good to go.
Author:  dimmo [ Sun Nov 18, 2018 12:04 pm ]
Post subject:  Re: Disk Hubs
hpal wrote:
I’d say at a guess they are built hubs but not set up correctly, ie too much preload. They have likely used aftermarket bearings which are hit and miss with the preload you will need to set them up properly and fit longer spacers and machine them down to get your required preload. I had to do this as well when building my hubs as one spacer was a bit short. Apparently timken bearing are better and can be put in and will have the correct preload and be good to go.



Thanks, I had a suspicion that may be the case. ahh well, more time consuming jobs
Author:  Harley [ Sun Nov 18, 2018 7:57 pm ]
Post subject:  Re: Disk Hubs
The case hpal mentioned will be easily confirmed if you put the drive flange on without the disc.
If the flange only can go on and it doesn't lock up, check that your disc retaining screws arent too long or something like that.
Author:  dimmo [ Sat Nov 24, 2018 11:57 am ]
Post subject:  Re: Disk Hubs
Harley wrote:
The case hpal mentioned will be easily confirmed if you put the drive flange on without the disc.
If the flange only can go on and it doesn't lock up, check that your disc retaining screws arent too long or something like that.



put the flanges on on their own and all seems good. The bolts holding the disc to the flange do not protrude through the disc centre at all so it seems like the disc centre is too thick (? ) or the flange has been machined for some reason. These are the parts that were on the car when i bought it and it had been flogged so all things are possible. I think i will just get new flanges and discs and try from there.

Thanks for the info
Author:  drmini in aust [ Sat Nov 24, 2018 12:37 pm ]
Post subject:  Re: Disk Hubs
If new drive flanges don't fix it, the problem is the bearing spacer supplied is too thin.
As hpal said above Timken kits seldom have this problem, but the no-name kits do. I recently had the same problem with an all new 7-1/2" disc brake kit.

See my blog in the how-to forum for assembly information.
Author:  hpal [ Sat Nov 24, 2018 2:26 pm ]
Post subject:  Re: Disk Hubs
They really shouldn't sell them as built ready to bolt on should they! If they've just built them with aftermarket bearings and not checked the set-up at all, it probably wouldn't be viable to set them up properly and as such they should probably only be selling prebuilt hubs using timken's so you can be pretty sure they'll be right.
Author:  drmini in aust [ Sat Nov 24, 2018 3:09 pm ]
Post subject:  Re: Disk Hubs
My no-name kits had 1 spacer 5 thou too short, and one 3 thou short. I found a 3 thou longer one in my collection but had to machine a 5 thou longer one from steel tube. Luckily I have a lathe.

You only want around 1 thou preload when hub nut is fully torqued up.
If you run them with too short a spacer the bearings destroy themselves quick smart from excessive preload.
These aftermarket bearings seem well made, pity the supplied spacers are often too short.
Author:  dimmo [ Sun Nov 25, 2018 3:53 pm ]
Post subject:  Re: Disk Hubs
drmini in aust wrote:
My no-name kits had 1 spacer 5 thou too short, and one 3 thou short. I found a 3 thou longer one in my collection but had to machine a 5 thou longer one from steel tube. Luckily I have a lathe.

You only want around 1 thou preload when hub nut is fully torqued up.
If you run them with too short a spacer the bearings destroy themselves quick smart from excessive preload.
These aftermarket bearings seem well made, pity the supplied spacers are often too short.


I checked flanges and found one has a lot of wear on the pressure surface and the other does not.
I placed shim material between the bearing surface and the spacer and it was about 30 thou before the grinding noise stopped. this means the spacer is very short i guess.will get new flanges anyway and it is probably cheaper for me to get a set of timken bearings rather than send them out to be done.
Author:  hpal [ Sun Nov 25, 2018 5:06 pm ]
Post subject:  Re: Disk Hubs
Yep probably best to get new flanges and timkens if you don’t have the means to make new spacer yourself. Much easier
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