So I used some silicone spray to ease the job of pressing in the rear subframe bushings on my '86 325es. But now that I think about it i'm kind of nervous that the subframe could slide on the bushings once on the car because there will not be enough friction to hold it tightly on the busing. Just want to hear your thoughts/experience with this. Thanks.
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Will my rear subframe bushings "uninstall"?
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Yer gud. That 6" bolt and 2.5" washer will do its job of holding it all together for yousigpic
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Originally posted by flyboyx View PostYer gud. That 6" bolt and 2.5" washer will do its job of holding it all together for you
Unless, once the bolt is tightened down, that makes the bushing "expand" within the subframe, wedging it in there so tight that there is no way it will move anywhere?
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Originally posted by Mook613 View PostThe bushing has the car's body on top and the bracket on the bottom and therefore can't move once it's all bolted in.
With poly bushings, it is even recommended to slather up the bushing in a grease or anti-seize when installing to prevent squeeking.
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true - mine were lathered in lithium grease when pressed in to lube them up and make sure they don't squeak.
Once the weight of the car is on the bush, as the bush is clamped by the bracket at the bottom and can't move, it will try to expand inside the sleeve on the subfame - there's no way the subframe is moving with around 500lbs of pressure transferred through the bush to the sleeve that the bush sits in (plus whatever pressure the bolt running through the bush puts on it too).
Sure - friction is the only thing holding the subframe, but that friction is pretty high!
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