I don't feel this is entirely true. By design the Brake shoes are
mounted in a configuration that they float.?????????????????
Reference the following....(even slight errors)
> If the center bore was mis-matched, and so were the wheel stud holes, it
> would be
> humanly impossible to properly center the drum upon reinstalling the
> wheel. As you
> say, even slight error would result in pedal pulsation, if not brake
> overheating from
> continually dragging for part of each rotation.
>
Power British Performance Parts, Inc. wrote:
>
> J&E wrote:
>
> > Taken from 1-10-00 TR Digest List
> > >Hi Karl,
> > I'm copying this to the list as it may be unclear for others as well.
> >
> > If the center bore was mis-matched, and so were the wheel stud holes, it
> > would be
> > humanly impossible to properly center the drum upon reinstalling the
> > wheel. As you
> > say, even slight error would result in pedal pulsation, if not brake
> > overheating from
> > continually dragging for part of each rotation.
> >
> > Actually, the center bore that fits over the axle nut is the same for
> > both drums, and
> > there is no problem with drums locating on center for either
> > combination. The
> > difference is in the shank of the wheel stud. While both cars take the
> > same 7/16 - 20
> > lug/stud, the shank on the solid axle cars is stepped to about 9/16 at
> > the hub and the
> > holes in the drum for the studs are correspondingly larger. With that
> > in mind, if you
> > were to install a TR-4 drum onto a TR-6, the drum would locate properly
> > on the hub's
> > center, but you'd have axial shift about the extra clearance in the stud
> > holes. In
> > this situation, the only positive location for the drum would be the
> > retaining
> > screws. True, friction between the drum, hub, and wheel would and
> > should probably
> > keep it from shifting. But if it doesn't, the drum may slip, especially
> > in a panic
> > stop the forces involved are quite high. If the drum does slip, all the
> > panic-braking
> > force would be transmitted throught the locating screws and the they
> > might shear under
> > such stresses. This could result in potential damage to the drum or
> > hub.
> >
> > Of course, you could run the combo without the screws, and just allow
> > the drum to
> > shift on the clearance around the stud holes, but I sure wouldn't want
> > to take any
> > chances like that with my brakes. Regards, -Brian Schlorff <
> > -----------------------
> > Hi List!
> > Question: Why can't some type of "pipe or tubing" be installed as a
> > "sleeve" to take up the space between the wheel stud & drum hole for the
> > wheel stud. Thus being a "bushing" of some type? Also, if this was to be
> > done would Stainless Steal be an accpetable material? If not, then what
> > material would be accpetable? Wouldn't I be a good idea to coat the
> > inside & outside of this material with an anti-seize grease coating for
> > easy removial of the drum? -Cosmo Kramer
>
> Yes, sleeves could be made up if you really had to run a TR-4 drum on a TR-6,
>but just
> be very clear that it is marked in some way so if someone else takes the drum
>off,
> they know to look for the spacers and not to overlook them on reinstallation.
> The
> only time this would be an issue is if you were to put TR-3/4 drums on a
>TR-6. Again,
> I strongly urge you not to take ANY chances with brakes and just get the
>right drums.
> TR-6 drums are very easy to find. The only time I could see a real need for
>this
> procedure would be if you were to get a set of Alfin's that were once on an
>early car
> and you are now trying to fit them to a late car. If you're doing that, just
>have
> them drilled for the correct size stud at a 45 degree offset - then you'd
>effectively
> have dual pattern drums. Alternatively, you should be able to find a machine
>shop to
> weld the holes up and redrill them to the correct size. If you get the 240Z
>drums,
> they'll be the smaller size to begin with and you can just machine them to
>fit your
> particular application.
>
> Regards,
>
> Brian Schlorff '61 TR-4 '64 TR-4 '72 TR-6 '79 Spit
> ---------------------------------------------------------------------
> Power British Check out Power British
> 1242 E. Ridge Pike on the 'net!
> Plymouth Meeting, PA 19462
> (610) 270-0505 http://www.powerbritish.com/~britcars
> ---------------------------------------------------------------------
|