Paul,
Conical bearings need some (not much) pre loading. There are several ways to
do this. MG used a spacer and as you mentioned a torque of 40-70 Ft Lbs.
With the spacer and correct shims fitted this gives the correct pre load on
the wheel bearings. Other makes have a different way of skinning the same
cat. My company (Volvo) on 240's have the technician torque the wheel
bearings to 30 Ft. Lbs. and spin the wheel to center the bearings, then loosen
the nut 1/2 turn and retorque to 11-15 inch Lbs. this also pre loads the
bearings to the correct amount. Either way the idea is to remove the slop and
not to over load the bearings which would cause a premature failure.
Rick Ewald
67 MGB
In a message dated 3/29/99 12:30:42 PM Pacific Standard Time,
paul.hunt1@virgin.net writes:
> As well as the spacer and shims, when tightened to the correct torque of
> 40 - 70lb ft, strengthening the axle shaft they also stop any tendency for
> the inner races to spin on the axle. The correct shims will give an
> end-float of .002 to .004in, not a loading of 11 to 15 in lb.
>
> PaulH.
> http://freespace.virgin.net/paul.hunt1/
>
> -----Original Message-----
> From: Karl Shultz <karl.shultz@ibm.net>
> To: MG List <mgs@autox.team.net>
> Date: 26 March 1999 05:20
> Subject: pulling out the spacers in the front hubs
>
>
> >Hello MGers,
> >
> >Hope all is well with you getting your assorted brit cars ready for the
> >warm season. I'm coming along myself - I've replaced the brake lines
> >(which looked as old, if not older, than the entire 73 B itself), the
> >heater control valve (with a gasket now) some hoses, and made some hacks
> >into the electrical system whose effectiveness seems to vary day to day.
> >
> >Anyhow, I took a trip to Flying Circuis Cars in Durham, NC. They're a
> >Brit car specialist where I buy my parts. So I go to buy shims for the
> >front hubs (which rattled about horribly) and a guy came in from the
> >garage area telling me something interesting. I'd like to bounce this
> >off the group, it seems odd.
> >
> >He said that the big spacer, and the accompanying shims, could be
> >installed in the trash can rather than the hub. "Conical bearings can
> >accept the load themselves no problem; people used to think you had to
> >make perfect contact between the bearing housings with those shims, but
> >all the cars we work on, we just pull all that stuff out.
> >
> >Odd, no? I tried it. The hub can be put together and adjusted up just
> >fine without all this stuff. But concerned for the longevity of the
> >bearings (they say "made in england," so they must be as old as the car
> >too...) I haven't really finalized the work.
> >
> >Any thoughts on this odd suggestion?
> >
> >--
> >Karl Shultz
> >95 Integra GS-R, black, loud
> >73 MGB, orange, only marginally drivable
>
>
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