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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Wed, May-17-2017, 08:12:19 PM   #1
Philby
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Question rear shock mounts failing FAST

SO.... I must be doing something wrong

Blown out TWO sets of rear shock mounts in just a few miles.

Installing new Bilsteins on my own (E36 M3 of course)

First set of mounts was a fresh "upgrade kit" from Pelican Parts, said to be E46 mounts, includes reinforcement plate above the tower. My towers look fine.

This first set both pushed the rubber out of the steel mount on a big bump after about 2 miles of driving!

Second set was the previous mounts which looked fine (no cracks visible). One of these tore the rubber all around and pushed up and out, just a mile or two.

1. Maybe not torqued properly? I torqued these before installing in the car, upon further study I should torque after car is off the jacks on level ground? [though I will need a crowfoot wrench to torque it while holding the shaft?]

2. Needs new or at least correct upper and lower washers? These appear to be dished in the parts book, maybe not what was on the car when I bought it. I re-used these washers. My old lower washer slips all the way over the shock shaft, past the shoulder. Seems to me the lower washer should sit on the shoulder, which would allow it to transmit force to the rubber in the mount.

3. Could these be wrong shocks? Bavauto and Pelican list only one Bilstein, I think there used to be different ones for lowered vs. stock (my car is not lowered)

Thanks!
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Old Wed, May-17-2017, 10:13:27 PM   #2
JGard
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Default Re: rear shock mounts failing FAST

I have never heard of anybody blowing out their shock mounts. If you're getting that much travel (which is the only thing I can see causing that problem) then you likely have other problems. How are the bump stops? How are the rest of your bushings? Stock springs? Something else is likely wrong with your suspension and this is just one of the symptoms.
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Old Wed, May-17-2017, 10:15:07 PM   #3
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Default Re: rear shock mounts failing FAST

Washer on the bottom should not go over the shaft. Should stop at the bottom of the shaft to dissipate the load.
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Old Thu, May-18-2017, 12:08:42 PM   #4
fiveightandten
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Default Re: rear shock mounts failing FAST

It should look like this:
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Old Thu, May-18-2017, 01:16:23 PM   #5
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Default Re: rear shock mounts failing FAST

I agree -- the OP is installing the shock to the RSM incorrectly.
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Old Thu, May-18-2017, 03:09:10 PM   #6
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Default Re: rear shock mounts failing FAST

Lower washer must be the problem, yes.

The old shocks had a slightly bigger diameter lower shaft, so the old washers sat on the shoulder.... just barely small enough inner diameter to sit on the shoulder.... looks like it was selected from the old-hardware bin.

Should have thought more clearly and checked when the lower washer went past the shoulder

Thanks folks!
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Old Fri, May-19-2017, 11:57:14 PM   #7
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Default Re: rear shock mounts failing FAST

You can press the rubber back in there. It's tough, but it'll go back in. Use oil
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Discussing rear shock mounts failing FAST in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)