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Clayton, --
The bearing outer race must be a press fit in the hub to prevent
relative motion and wear. If the bearing was loose in the hub the
outer race would "walk" (orbit) in the rotating hub causing wear in
the hub that would increase the clearance with time. This happened
to my front hubs a few months ago, and it got so bad that I had to
repace the hubs. If you catch this situation early enough you can
install the bearings into the hub with Loctite 620 bearing set
adheive to prevent motion of the outer race in the hub. For future
service it may require heat to soften the adhesive to remove the
bearings from the hub.
The bearing inner race can be a slip fit on the spindle. When the
spindle nut is tightened it pushes all of the parts tight together,
oil seal spacer, inboard bearing inner race, inner race spacer,
outboard bearing inner race, keyed flat washer, and the nut. When
all is tight the inner bearing races cannot move on the spindle.
Barney
At 03:54 PM 7/18/2015 -0700, Clayton Kirkwood via Mgs wrote:
>....
>Hello Barney.
>
>I read with great interest Barney's The Nature of ROLLING ELEMENT
>BEARINGS -- UT-106 at mgaguru.com, regarding the loading and
>tightness of bearing in the front hub. If the Gentle Reader
>remembers, we were last reviewing the problems of my hubs, bearings
>and various other components of suspension and brakes. A quick
>recap: wire wheels with unmovable brake caliper pistons (shot) and
>both inner and outer bearings a variable tightness in hubs. The
>inner spacer was not tight, it wobbled around inside the hub more
>than the .0125" free that adding up the numbers in the repair manual
>suggest (more like .15 inch short) although the bearings were
>against the shoulders and neither bearings nor inner spacer appeared
>worn axially. I found that the last assembly was missing the oil
>seal spacers on both side. There is some definite wear at the outer
>bearing spindle suggesting problems with solidarity of bearings and
>inner spacers, very possibly because of missing oil seal spacer.
>
>Barney's explanation is worth the read just to better understand
>bearings in general, but front MGA bearings specifically. My
>greatest difficulty in reading his missive was regarding the fit of
>the bearings on the spindle and inside the hubs. The suggestion is
>that the outer races should be press fit or close, while the inner
>races on the spindle should only by hand application tight. Barney,
>I don't really understand why the inner races can be so relatively
>loose. Because of the relative damage to the spindle, a noticeable
>wear on one side of the spindle especially on the outer bearings, I
>would think that a slip fit inner race, even with axial compression,
>would allow potential spinning on the spindle causing wear similar
>to what I am seeing. Will I have a problem with gluing the inner
>races to the spindle? I realize this may make it difficult to
>dismantle later but perhaps a small amount of glue would be
>acceptable given the current wear? Moss doesn't have replacement
>spindle knuckles, only hubs, which, with the new bearings I am
>buying, may still need to be purchased.
>
>At this point, I am purchasing bearings, all new spacers, oil seals,
>brake calipers, pads, disks, suspension kit, swivel links, bolts and
>side washers and associated swivel pins, tie rod ends. Expensive.
>
>Thanks for any illumination.
>
>Clayton
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Clayton, -- <br><br>
The bearing outer race must be a press fit in the hub to prevent relative
motion and wear. If the bearing was loose in the hub the outer race
would "walk" (orbit) in the rotating hub causing wear in the
hub that would increase the clearance with time. This happened to
my front hubs a few months ago, and it got so bad that I had to repace
the hubs. If you catch this situation early enough you can install
the bearings into the hub with Loctite 620 bearing set adheive to prevent
motion of the outer race in the hub. For future service it may
require heat to soften the adhesive to remove the bearings from the
hub.<br><br>
The bearing inner race can be a slip fit on the spindle. When the
spindle nut is tightened it pushes all of the parts tight together, oil
seal spacer, inboard bearing inner race, inner race spacer, outboard
bearing inner race, keyed flat washer, and the nut. When all is
tight the inner bearing races cannot move on the spindle.<br><br>
Barney<br><br>
<br>
At 03:54 PM 7/18/2015 -0700, Clayton Kirkwood via Mgs wrote:<br>
<blockquote type=3Dcite class=3Dcite cite=3D"">....<br>
Hello Barney.<br>
<br>
I read with great interest Barney=92s <b>The Nature of ROLLING ELEMENT
BEARINGS -- UT-106 at mgaguru.com, </b>regarding the loading and
tightness of bearing in the front hub. If the Gentle Reader remembers, we
were last reviewing the problems of my hubs, bearings and various other
components of suspension and brakes. A quick recap: wire wheels with
unmovable brake caliper pistons (shot) and both inner and outer bearings
a variable tightness in hubs. The inner spacer was not tight, it wobbled
around inside the hub more than the .0125=94 free that adding up the
numbers in the repair manual suggest (more like .15 inch short) although
the bearings were against the shoulders and neither bearings nor inner
spacer appeared worn axially. I found that the last assembly was missing
the oil seal spacers on both side. There is some definite wear at the
outer bearing spindle suggesting problems with solidarity of bearings and
inner spacers, very possibly because of missing oil seal spacer.<br>
<br>
Barney=92s explanation is worth the read just to better understand bearings
in general, but front MGA bearings specifically. My greatest difficulty
in reading his missive was regarding the fit of the bearings on the
spindle and inside the hubs. The suggestion is that the outer races
should be press fit or close, while the inner races on the spindle should
only by hand application tight. Barney, I don=92t really understand why the
inner races can be so relatively loose. Because of the relative damage to
the spindle, a noticeable wear on one side of the spindle especially on
the outer bearings, I would think that a slip fit inner race, even
with axial compression, would allow potential spinning on the spindle
causing wear similar to what I am seeing. Will I have a problem with
gluing the inner races to the spindle? I realize this may make it
difficult to dismantle later but perhaps a small amount of glue would be
acceptable given the current wear? Moss doesn=92t have replacement spindle
knuckles, only hubs, which, with the new bearings I am buying, may still
need to be purchased.<br>
<br>
At this point, I am purchasing bearings, all new spacers, oil seals,
brake calipers, pads, disks, suspension kit, swivel links, bolts and side
washers and associated swivel pins, tie rod ends. Expensive.<br>
<br>
Thanks for any illumination.<br>
<br>
Clayton</blockquote></body>
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