The brass bushing, is so the FDS axle can float up against it. It's a wear point, since brass is softer than steel. The grooves hold grease, to reduce wear and thus sound of metal to metal.
The hub flange snap ring, come in various thicknesses. By setting hub flange snap ring gap at less than 0.20mm. Were pulling the seals (knuckle seal and FDS outer axle seal) together, to make a watertight seal. The brass bushing, is number the one wear point. The various size snap rings, take up the wear of brass.
Note:
Even when FDS axle pulled up to knuckles brass bushing and gap set to spec:
I see some issues, when non OEM or remain FDS used.
Outer axle seal, that FDS comes with. May not be the same as OEM or worn out. So we may get water entry.
Water entry also:
Snap ring gap, larger than spec. We may get water entry.
Hub flange pounded off, warping or creating lips (high spots), so hub flange will not mat perfectly flush. We may get water entry.
Reusing grease cap, we may get water entry.
Grease turns milky brown, if water mixes in it.
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CVJ reman FDS, painted black (I hate that paint). The paint damaged axle bearings, and can damage wheel hub seal. Note: If using a painted FDS axle. Remove the paint, before installing.
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This one had spindle threads damage from reuse of wheel bearing lock washer, also damaged ball joint & TRE boot seats, from pound off with BFH, rather than using ball joint pullers as one should. Additional, it was an excessively rusty knuckle.
Axle contaminated grease cleaned up, paint removed. Also axle needle bearing, brass bushing, seal surfaces polished (shown before polishing).
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Recondition all metal, painted with POR-15 Top Coat, new needle bearing & brass bushing, seal. Needle bearing pack with grease and brass coated with grease.
Knuckle recondition and ready to install..
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