From digest.v6.n697 Mon May 26 18:58:48 1997
From: BMWBill <bmwbill_at_mindspring.com>
Date: Mon, 26 May 1997 14:22:16 -0400
Subject: re:E30M3 Lucky at Hell, do this mod!!!
E-30 M-3 owners beware both the inner and outer ball joints have failed
with regularity on tracked M-3s for years. These failures were reported
to BMW-CCA speed events officials as early as 1993, but E-30 M-3 owners
were never notified in any way by BMW-CCA. I personally know of one
BMW-CCA drivers school instructor who has had three on-track balljoint
failures. Contrary to the post "E30M3 Lucky at Hell, do this mod!!!"
the aluminum 1990 and later lower control arm DOES NOT CURE this
problem. The breakage is caused by the lateral shear forces exceeding
the design limit (diameter) of the balljoint shaft itself, especially
when sticky track tires are fitted, which raise the forces considerably
from street tires. There is no remedy for this, only yearly replacement
of the control arms on heavily tracked E-30 M-3s and very careful
torqueing of the balljoint nuts are available options to help prevent
these catastrophic failures from occuring as often.
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