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Re: FRONT SUSPENSION (archive)

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Posted by Wayne McKay on August 07, 2001 at 10:42:39:

In Reply to: FRONT SUSPENSION posted by DERECK on August 07, 2001 at 09:49:22:

Rattles over bumps are usually the anti-sway bar link joints. The ball joints could be worn out or possibly just loose. The other components you are refering to, upper and lower control arms, are usually associated with shimmies and shakes. Impropely fitted or completely worn out shock inserts can produce rattles as well but poor fitting would rattle from the start and inserts worn out that bad would cause you to complain about wheel bounce or hop. A third option could be a loose upper strut mount assembly. Either the three 8mm studs holding the upper mount in place or the top nut on the insert itself could cause rattling if they were loose. The correct torque for the three studs is 22 Nm (16 ft-lb) and for the top nut/cartridge is 65 Nm (48 ft-lb) for the external hex style or 45 Nm (33 ft-lb) for the internal hex style of shaft.

The control arms extend from the bottom of the wheel assembly inwards where they attach to the body of the vehicle through 'rubber' bushings. They are fairly thick curved steel bars and attach to the wheel through large ball joints. The anti-sway bar is also a fairly thick rod and extends from one side of the vehicle to the other. It attaches to each strut through a thin link oriented vertically. The link has a small ball joint on each end. The other component in this area is the tie rods (left, right and center). The center link connects to the steering pitman arm, the idler arm and to both the left and right tie rods. The left and right tie rods connect to the same item (steering arm) on the bottom of the strut that the upper and lower control arms connect to.

Hope this helps,
'88 750iL


My front end rattles when I go over speed bump or even very shallow pot holes, could this be my controller arm bushings.. I took one of my front wheels off thinking it was my brake callipers but turn to find out it is an arm running from behind my hub to the chasis.. Is that the controller arms PLEASE ADVISE....





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