Miata Mailing List: January 2000, Message #36

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All,
Thanks to all that replied to my question, both on and off the list.
I feel ready to assemble now. 
I will use 10.9 low head black oxide Unbrako's. Available at my local shop.
Torque to standard (ZF-manual).
I was told that the preload of the tapered bearings can't be checked with
the pinion installed. But there is no need as long as only the bearing is
replaced.
I've taken a picture of the ring-gear with locked bolts. If anyone is
interested in seeing that, I can mail it to your private mail-adress.
Thanks again folks.
espen


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> Fra: Espen Graffer <espeng@c2i.net>
> Til: Multiple recipients of list <detomaso@realbig.com>
> Emne: ZF-question
> Dato: 21. januar 2000 22:22
> 
> Hi All,
> I have removed the differential from my gearbox for safety-locking of the
> ring-gear bolts, as per instructions from this wonderful list (thanks
> guys!).
> When doing that I was unfortunate to ruin a couple of the screws holding
> the differential housing cover. They are low head Unbrako's M8 x 18 mm,
and
> gold/yellow plated. Tensile strength 12.9. My local fastener provider (in
> Oslo) says that they now can't be delivered stronger than 10.9.
> 
> Anybody know if 12.9 is really needed? 
> Is the gold plated 12.9 Unbrako screw the correct original one (in the
> ZF-manual it's drawn with hex head)?
> 
> I had to replace one of the tapered bearings (I ruined that one too! 
> <blush> ). When assembli