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From digest.v6.n772 Sun Jun 15 07:25:10 1997
From: Kurt Gibble <kurt.gibble_at_yale.edu>
Date: Sat, 14 Jun 1997 12:28:43 -0400
Subject: <E34> Thrust Arm Bushing Replacement
Few years back when I joined the list, all the E28's were shaking (Are
you back yet Steve B.?). It looks like it's our (E34) turn now. Mine
(and Don E.'s too) had a bad vibration at 55 mph that goes mostly away
by 60. I did shocks/springs and, with the front struts off, it was easy
to see that the thrust arm could easily be rotated in the horizontal
plane. After removing it, there were large cracks in the rubber
bushing. (If you imagine that the front suspension sort of looks like
an A-arm made of 2 separate pieces, the thrust arm is the one towards
the back of the car and the bushing is the one attaching it to the frame
- other end is a ball joint - see below.)
You can buy replacement arms with new bushings - I bought replacment
bushings and pressed them in (have access to a 50 Ton hydraulic press).
If you press them, you'll need 2 pieces of tubing about 4" long
(probably from a good plumbing store or machine shop scrap) - one should
have an OD just smaller than the size of the bushing and the other an ID
just bigger to support the arm. Needed ~1/2 to 3/4 Tons of force to
press-in - the old ones were easy to get out (go figure). If you press
them yourself, be careful - if things go crooked, they can fly far and
fast. Have not BTDT and don't want to.
On the one side, the thrust arm came right out. On the other, I
couldn't unseat the thrust arm ball joint (I didn't have the special
tool). However, if you undoe the 3 lower (19 mm) strut bolts and undoe
the front contral arm body mount, then it's easy to get the thrust arm
pivoted out from under the car so that, with the proper tool it'd be
easy to press in (see Steve d' I believe). I had done this hoping to
undo the tie rod ball joint - it also did not cooperate. Only mildly
daunted, I uncsrewed the tie rod by turning the whole contraption - not
quick but quicker than all the time I already wasted trying to undo the
ball joint. If you do this, mark the tie rod position, count CAREFULLY,
and check your toe when your done (not a bad idea in any case). With
all this off the car, it was easy to press out the ball joints with the
press and push in the new bushing. Remember to tighten all the bushing
mounts to the frame with the car on the ground (well, actually on
2x4's).
No more stinkin' shimmys,
Kurt
'92 E34 M50
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