TC Front Hub Assembly

[NEWetzel@aol.com]

Bob, (and the rest of the list also)
Do you know what the std part numbers would be for tapered bearings to
replace the balls. (Speaking of which, I am glad I am not a brass monkey
today in Michigan -12 F.). I may as well do the rebuild correctly as long as
I am this far.
Thanks in advance to all.
Norm Wetzel

[Bob and Carolyn Grunau]

TC front wheel bearings using Timken tapered roller bearings:
4 off-07204 cups
2 off-07079 cones
2 off-07097 cones.
Bob

----------

> From: NEWetzel@aol.com
> To: cgrunau@pathcom.com; AJChalmers@aol.com; JTPAKI@aol.com;

mg-tabc@egroups.com

> Subject: Re: [mg-tabc] Re: TC front hub assembly
> Date: Friday, January 21, 2000 12:17 PM
>
> Bob, (and the rest of the list also)
> Do you know what the std part numbers would be for tapered bearings to
> replace the balls. (Speaking of which, I am glad I am not a brass monkey
> today in Michigan -12 F.). I may as well do the rebuild correctly as

long as

> I am this far.
> Thanks in advance to all.
> Norm Wetzel

[Ray McCrary]

The spacer loads the hub near the inside. Without it, the tapered spindle
flexes.
Regards,
Ray McCrary
"Speed is Life;
of course Luck and Altitude
are helpful, too."

----- Original Message -----
From: "Bob and Carolyn Grunau"
To: "Peter Pleitner" ; ;

Sent: Wednesday, January 19, 2000 7:18 PM
Subject: [mg-tabc] Re: TC front hub assembly


> Peter, John and Others,
> The question of use of the bearing spacer has been answered MANY times.
> Original information 35 years ago said to delete the spacer with tapered
> rollers. This information was WRONG.
> Please ALWAYS use the bearing spacer, suitably shimmed with shims if using
> tapered roller bearings, as it makes for a much stronger front stub axle.
>
> Regards, Bob
> ----------
> > From: Peter Pleitner
> > To: JohnHWSteedman@aol.com; mg-tabc@egroups.com
> > Subject: [mg-tabc] Re: TC front hub assembly
> > Date: Wednesday, January 19, 2000 4:42 PM
> >
> > Hi John,
> > New ball or roller bearings? Do you have the original spacer between
the
> > inner races?
> > Cheers, Peter
> >
> > -----Original Message-----
> > From: JohnHWSteedman@aol.com [mailto:JohnHWSteedman@aol.com]
> > Sent: Wednesday, January 19, 2000 4:16 PM
> > To: mg-tabc@egroups.com
> > Subject: [mg-tabc] TC front hub assembly
> >
> > I am just about to reassemble my front hubs/stub axles with new
> bearings,
> > seals and hubs. Is there a preferred sequence of assembly, - I've
> learned
> > that it pays to ask before you start!
> >
> >
> >
> > John Steedman TC 0301
> >
> > ------------------------------------------------------------------------
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[Ray McCrary]

Actually, the thing is elegantly simple.
The interference fit between the bearing retainer nut, inner race of outer
bearing, spacer/shims, the inner race of the inner bearing, and finally the
inner spindle shoulder creates a rotating column around a solid shaft.
As you may recall, a column is stiffer than a solid rod of the same diameter
because of added surface area.
Regards,
Ray McCrary
"Speed is Life;
of course Luck and Altitude
are helpful, too."

----- Original Message -----
From:
To: ;
Sent: Thursday, January 20, 2000 8:25 AM
Subject: [mg-tabc] Re: TC front hub assembly


> Don't even think of using other than ball bearings in the front hubs.
Stub
> axles are designed for balls and rollers tended to cause two piece stub
> axles. I can't locate the scholarly treatise on the subject, but if I do
I
> shall post.
>
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[Ray McCrary]

Quite true. The tapered bearings have a much higher side-load bearing
strength than the ball bearings. But you still have to use the spacer.
Ray McCrary
"Speed is Life;
of course Luck and Altitude
are helpful, too."

----- Original Message -----
From: "Bob and Carolyn Grunau"
To: ; ;
Sent: Thursday, January 20, 2000 7:09 PM
Subject: [mg-tabc] Re: TC front hub assembly


> I disagree.
> The stub axle does not know if ball or roller bearings are being used. The
> critical difference is that previous information was to leave out the
> bearing spacer and install the stub axle nut loose when using tapered
> roller bearings. This resulted in a smaller effective diameter stub axle
> than if the whole assembly was locked up using the spacer and shims and
the
> nut fully tightened. That was the problem, not the bearings. A
> properly set-up front stub axle using tapered rollers, bearing spacer and
> shims to allow the stub axle nut to be fully tightened will result in a
> much superior wheel bearing assembly.
> Tapered roller bearings are far superior to the original ball bearings.
> Thats why modern cars use tapered rollers.
> Bob
> ----------
> > From: AJChalmers@aol.com
> > To: JTPAKI@aol.com; mg-tabc@egroups.com
> > Subject: [mg-tabc] Re: TC front hub assembly
> > Date: Thursday, January 20, 2000 9:25 AM
> >
> > Don't even think of using other than ball bearings in the front hubs.
> Stub
> > axles are designed for balls and rollers tended to cause two piece stub
> > axles. I can't locate the scholarly treatise on the subject, but if I
do
> I
> > shall post.
> >
> > ------------------------------------------------------------------------
> > For the fastest and easiest way to backup your files and, access them
> from
> > anywhere. Try @backup Free for 30 days. Click here for a chance to win
a
> > digital camera.
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> >
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> > -- http://www.egroups.com/ChatPage?listName=mg-tabc&m=1
> >
> >
>
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> digital camera.
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>

[m.jablonski@mei.unimelb.edu.au]

I thought I'd sent this to the list but it hasn't appeared so I presume
I only sent it to the individual whose posting I was replying to.

I believe that by including the bearing spacer the stub is preloaded
and that this reduces stress cycling in the stub root. Stress cycling
is the primary cause of fatigue failure. Increasing the effective
diameter of the stub (by use of the spacer) also reduces the stress
level at the root and this also improves the fatigue life.

When I converted my hubs to tapered roller bearings I used the bearing
numbers given in TSO, in an article by F E Old. These correspond to
those posted by Bob Grunau.

When I came to do the work I found that the inner and outer races were
stepped in relation to one another by 1.25mm which would have resulted
in the hub and brake drum being pushed out by that amount and the space
between inner races greater than the length of the original spacer. I
ended up making a new inner spacer (the one the oil seal runs on) with
a thickness of 0.200" (original 0.250") to compensate for the 1.25mm.
I also made up an additional spacer, 0.100" thick, to go between the
bearings. Then, with shims, I set up the bearings for a clearance of
0.005". The shims were available from my local automotive parts
supplier (Repco in Oz). The arrangement was similar to that on my MGB.
Interestingly, I needed 0.020" of shims on one side and 0.015" on the
other. I could have made the 0.100" spacer a little thicker to reduce
the number of shims I needed.

With apologies for the late posting,

Mark Jablonski
TC6022