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Preload on 997 (drum brake) CVs
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Author:  Mick [ Mon Mar 11, 2013 4:22 pm ]
Post subject:  Preload on 997 (drum brake) CVs
I'm away from home so can't check.

Are ball joint shims big enough to be used as shims for pre-loading a set of tapered rollers on a 997 Disc brake (ie Drum brake) CV and drive flange?

I have picked up a set of EBC greens for the diminutive little discs. I wonder how it will go...or stop...
Author:  drmini in aust [ Mon Mar 11, 2013 5:59 pm ]
Post subject: 
Nope the CV shaft is 1.250"(31.75mm).
A balljoint shim is only 29mm bore. :cry:
Author:  Mick [ Mon Mar 11, 2013 6:00 pm ]
Post subject: 
Where do you pick them up from? Or I suppose I will need to hand cut a few shims...
Author:  drmini in aust [ Mon Mar 11, 2013 6:06 pm ]
Post subject: 
You don't usually shim bearings on a 997, a tapered roller kit should go straight in and work with the spacer in the kit. But yeah if the bearings are aftermarket, & have a 1/2 spacer on and it's too tight when assembled, I can see you might want a shim.
I machined some thick spacers up once, can send you one and you can face it off in a lathe there as needed if that helps.

PM sent.
Author:  Mick [ Mon Mar 11, 2013 6:11 pm ]
Post subject: 
drmini in aust wrote:
You don't usually shim bearings on a 997, a tapered roller kit should go straight in and work with the spacer in the kit. But yeah if the bearings are aftermarket, & have a 1/2 spacer on and it's too tight when assembled, I can see you might want a shim.
I machined some thick spacers up once, can send you one and you can face it off in a lathe there as needed if that helps.

PM sent.


Thanks Doc.
Yeah they're the aftermarket variety, and the seal rings are new as well. but it's still a little too tight for my liking. I might try hand linishing the spacer a little. I've got a unimat lathe for some hobby work I'm keen to set up.
Author:  drmini in aust [ Mon Mar 11, 2013 6:14 pm ]
Post subject: 
If you linish the spacer thinner it will be TIGHTER!!! :shock:
They need to be dead parallel too.... bit hard on a linisher.
Author:  Mick [ Mon Mar 11, 2013 6:21 pm ]
Post subject: 
Oh...your right..oops. Shims or wider spacer it is!

These bearings have a seperate spacer to the bearing, like the Timkens.
One side is fine, the other is a little tight at the Drum CV nut specified torque.
Author:  drmini in aust [ Mon Mar 11, 2013 6:28 pm ]
Post subject: 
Mick wrote:
Oh...your right..oops. Shims or wider spacer it is!

These bearings have a seperate spacer to the bearing, like the Timkens.
One side is fine, the other is a little tight at the Drum CV nut specified torque.

Let me guess- noname ones in a blue box? :lol:
That's why I made thicker spacers... I needed them. Genuine Timken kits give no probs unless the web in the hub is worn.
Author:  Mick [ Mon Mar 11, 2013 6:34 pm ]
Post subject: 
drmini in aust wrote:
Mick wrote:
Let me guess- noname ones in a blue box? :lol:
That's why I made thicker spacers... I needed them. Genuine Timken kits give no probs unless the web in the hub is worn.


Ha ha, yep. I figured I wasn't going to drive the pants off the little discs. They're so cute.
Author:  mini_mad_matt [ Mon Mar 11, 2013 6:37 pm ]
Post subject: 
If you know someone who has a collection of the spacers go through them all with some verniers and you might find a thicker one. I've done that recently to solve the problem.
Author:  drmini in aust [ Mon Mar 11, 2013 7:57 pm ]
Post subject: 
mini_mad_matt wrote:
If you know someone who has a collection of the spacers go through them all with some verniers and you might find a thicker one. I've done that recently to solve the problem.

I have quite a collection, if you can give me the actual thickness you need.
If not I can machine one of my specials to width.
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