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#1
08-19-2006, 06:37 PM
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Support Arm Bushing Picts but no C/V's YET
For those that care, the support arm bushing is probably the most critical link in providing solid road feel. That bushings absorbs all the force when the wheel hits a bump and wants to deviate from the position the steering wheel is in. It literally supports the entire suspension and keeps it strait and true on the road. Just look at the support arm it’s 4 times the size of the control arm. This bushing is well know in the E39 circle and rarely mentioned when talking about front end concerns in the X5. At About 70k I started to notice the X feeling “light” in the steering wheel and not responding as crisp as when it was new. When I took a look around I noticed the sway bar links were shot, and both support arm bushing had a crack running around the entire mount. I pulled the support arms and pressed in new bushings, really big improvement in the feel. The deterioration of the mount is so slow that you really don’t notice what has been lost till you replace it. I know most DIY guys don’t have a press, but if your mileage is around mine have a look at that mount, it’s vastly more important that many owners think, and if your in the SF bay area I’ll press your arms for nothing, just let me know. First picts show the cracks. 
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#3
08-19-2006, 07:35 PM
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Yes, Rob is correct, no preload is needed, but on the ground is correct.
Last edited by The Cleaner; 08-19-2006 at 11:05 PM.
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#5
08-19-2006, 08:14 PM
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Has anyone ever looked for polyurethane aftermarket bushings for the X5?
Evosport shows the following fitment "Powerflex - Front Inner Track Control Arm (TCA) Bushings (pair) - e34 535, 540, M5 w/ alloy arms; e83 X3 (All); e53 X5 (All) - PFF5-620". http://www.evosport.com/product/prod...US.BMW.TCA.620 However, the Powerflex website does not show an E53 fitment. Both the E39 and E34 front suspensions are different than the E39 - control arms don't look the same. I wonder if this is a mistake in the Evosport catalog.
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#6
08-21-2006, 05:15 AM
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Cleaner last week while making the maintenace on my car I saw that the arm is not centered on the bushing. On passenger side arm is centered, but on the driver side the arm is is slightly to the right. Do you think this is a sign of wearing?
J.Seven
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#7
08-21-2006, 08:46 AM
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Quote:
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#8
08-21-2006, 10:30 AM
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I don’t thing it’s wear if they are not centered. I think the spec was 12.5 mm on each side of the arm. That is almost impossible to get exact, my new mounts are off by +/- a mm or 2. On interesting thing is that it’s a hydro mount, when I pressed out the old one I had to push the rubber part out of the sleeve about half way so I could line up the new bushing, anyway it poured out fluid from a chamber inside. I think the first sign of wear will be the crack you see in my photos, the second will be fluid leaking. I think by the time you have fluid leaking you will have significant change in how the car feels.
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#10
08-21-2006, 01:51 PM
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Yes, If you look at the first pict there is a triangle in the rubber at about 1 O’clock. That is to orientate the bushing in the arm. If you look at the arm there is also a notch at about 1 O’clock. You need to lines these up when you press in the mount.
The Bushing has 3 holes in the rubber and they go all the way thru. The crack goes right past the tip of the triangle in the rubber. The second blurry picture shows the crack from the left up to the top and down to the right on the mount.
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