[Mgs] Follow up to MGA 1600 MkII front end suspension suspense

[Barney Gaylord]

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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