z4 hubs fail. vid.

[LowR3V'in]

hey just to tell you guys check runout on these chinese hubs.
now i have to buy some new ones because these are f'd.
going to try to get a refund or new ones. The driver one seems ok though.


looks like the machining is off.

https://youtu.be/x6_0zabzBdo

[LowR3V'in]

so i bought an oem p/n 33416752381
and for some reason it does not fit my axle.

but it does fit the pos autozone axle
same p/n... so right now i don't know what to do.

it will slide in part way but does not go in on multiple oem axles.


First one is the china one second is oem.
The china one will also fit on the autozone axle btw.

E30 spines. by jet jones, on Flickr
Different splines? by jet jones, on Flickr

[LowR3V'in]

hope this helps other future people.
filed the shit out of the splines with a triangle.
tight fit but it slid in. There is no side to side movement it's locked.
maybe why bmw sorta improved on the splines because the older style it would have wiggle to it.


Filed to fit by jet jones, on Flickr

Tight fit by jet jones, on Flickr

[nando]

you need to deburr the splines on the OEM hub. BMW doesn't send them out deburred, I had the same problem with stock ix front hubs several years ago.

[LowR3V'in]

thanks for the tip
i'll try that on the next one but it was probably not that because the crappy autozone axle
slide right in. strange.

Run out on oem hovers between 0.00 to 0.01
it's pretty damn good. i'm happy.

Run out on china side that seemed to be ok goes to 0.18... not ok.

Again, when it comes to stuff like this buy oem / febi.
going reorder the other side but we learn with failure.
Only reason i check was because it would make a clicking noise back there.

Perfect oem by jet jones, on Flickr
Got to love china by jet jones, on Flickr

[CDNe30]

you need to deburr the splines on the OEM hub. BMW doesn't send them out deburred, I had the same problem with stock ix front hubs several years ago.

BUMP - I think i am having this same issue. Can you explain how you "deburr" the splines? Did you have to machine them or did you manually file down visible burrs?

[nando]

I did it manually, take a small file (I have some triangle shaped hobby files that worked perfectly for this) and file off the corners and any visible burs, and any you can feel with your fingers. it was still tight but before then it wasn't even close to fitting.

They probably fit easily on his autozone CV shafts because the splines on those are crap or were worn down from being remanufactured/bead blasted.

[CDNe30]

I did it manually, take a small file (I have some triangle shaped hobby files that worked perfectly for this) and file off the corners and any visible burs, and any you can feel with your fingers. it was still tight but before then it wasn't even close to fitting.

They probably fit easily on his autozone CV shafts because the splines on those are crap or were worn down from being remanufactured/bead blasted.

Thanks so much for the fast response! I think this is my issue - the hub will kind of seat into place but feels 1mm too big and doesn't slide on at all. Do you happen to have any pictures from your deburring? Never done something like this before.