Fwd: Wheel Bearing Postmortem, ws Note to Benz Strut Brace users.
b.benz at charter.net
Sat Dec 22 21:38:31 PST 2007
Begin forwarded message:
> From: Bernie Benz <b.m.benz at prodigy.net>
> Date: November 15, 2001 11:36:59 PM PST
> To: 200q20V mailing list <200q20v at audifans.com>, audi-20v
> <audi20v at rennlist.org>
> Subject: Wheel Bearing Postmortem, ws Note to Benz Strut Brace users.
> They can't both be broke, and they wern't!
> My conjecture is that the strut brace rigidly couples the unsprung
> masses of
> each side together mechanically and also these unisolated masses
> together in
> such a strong manner acoustically that it was impossible to
> determine, while
> driving, which side the rumble was originating from.
> The bearing postmortems revieled that both bearings were on the
> verge of
> suffering from a lack of lubrication at 140K miles, the grease
> being hard
> and not in contact with the balls. But only one bearing had any
> sign of
> damage, gauling on one of the two outer ball races. A little
> can surely make a lot of rumble noise.
> But the second bearing wasn't broke! So, after the thorough cleaning
> required for this inspection, it was easier to relube and
> reassemble the
> good one rather than indure the fight to remove the inner race from
> its hub
> for a new bearing. I did so, and now have one new, and one rebuilt
> installed. Put your money on the winner! Mine is on the rebuilt one,
> as I know its total condition. Another 250K will maybe tell.
> What else?
> The anti-sway bar bushings to the lower control arm were in good
> shape and
> not needing replacement at 140K, but I decided to increase the
> on them anyway. Did so by grinding 1mm from the center spacer of each
> bushing half, thus increasing the total bushing squeeze by 2mm. (BTDT
> before, different car)
> The ball joints and tie rod ends were tight and sound, so relubed
> them by
> injecting oil around the boots, hypo needle between shaft and
> boot. (BTDT
> The strut top thrust bearings were dry. Disassembled, cleaned and
> regreased. Careful! Lots of uncaged little balls. (BTDT)
> Tightened down 1/2 turn on the Koni rebound setting, after 25K miles.
> One big, dirty job! Pro wrenches earn their keep.
> I'm currently doing a front wheel bearing replacement job on the
> I can't tell which one is bad, even with a stethascope, so I may be
> to replace both sides. Heaven Forbid! They can't both be broke
> can they?
> But they sure have become real growlers over the past 6 months.
> Anyway, when removing the strut assembly you can save a little
> grief by
> removing the brace from the strut rod end and replacing it with
> just the nut
> while the car is still on the ground, as a first step. This will
> allow the
> strut assembly to be removed in one piece, rather than having a
> loose spring
> cause parts to fly all over. Add this note in your Bentley, pg.
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