12-11-2020, 03:06 PM | #1 |
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Hi folks,
I'm having a pretty bad clicking noise when I go from lock to lock when stationary on my M2. I installed MSS Height Adjustable Springs on my car this past weekend, and then the noise started coming up maybe ~400mi after install. I'm tempted to say it's the top hat / bearing, but wanted to see if others have had this issue before I order new top hats since they're pretty pricey. I already tried taking off the wheel and applying silicone spray towards the tophat area, and made sure there were no rocks in the wheel well. Shop said they have torqued everything to spec. This first link is the noise from my car: Second link is an M4 but with the exact same noise. **Pinch strut bolt tightened and replaced with new bolts, noise has come back**
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12-11-2020, 04:51 PM | #2 |
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Why would the existing top hats suddenly start making a noise as a result of changing the springs? The spring seats into a really big thrust race, so look at the other end, or suspect a seating issue.
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12-11-2020, 06:30 PM | #3 | ||
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Ended up finding the problem - my pinch bolt for the strut was loose. I guess the shop hasn't torqued it down properly to spec? Pics attached. Tightened the bolt and nut more and now it makes 0 noise! *whew*
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12-12-2020, 03:45 AM | #4 | |
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12-12-2020, 10:11 PM | #6 | |
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More of my thoughts here: https://f87.bimmerpost.com/forums/sh....php?t=1774036 |
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01-01-2021, 03:16 PM | #7 |
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Noise is back
Well the noise is back. I tightened the pinch strut bolt to spec and noise went away for about a day, but now is back and much louder than it was before. Not sure what it could be, but it legitimately sounds like bones creaking everytime I turn the wheel. Wonder if it's safe to drive??
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01-02-2021, 02:40 AM | #8 | |
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01-02-2021, 04:23 AM | #9 | |
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01-02-2021, 04:40 AM | #10 |
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First of all, make sure the springs are seated properly in the spring cups top and bottom. I don't know if MSS uses the stock cups?
Providing the above is ok, it could be the spring(s) slipping instead of the top hat bearing rotating. I have always suspected the top hat bearings tighten up under load (low cost design). When this happens, if it is easier for the spring to slip then that's what you will get. The spring being wound up when turning and it then slipping to release the tension, making the clicking noise as it does. Alternatively, it could be the strut top nut. They are notoriously difficult to tighten properly (pass through spanner arrangement in a hard to access hole). If the shop didn't have the exact right tools, they could have left it loose enough to move about. The Ackerman on these cars is such that a lot of load is placed on the suspension when turning. You might be able to see this happening. Take off the protective cover in the engine bay and watch for movement as someone turns the steering. It will be very slight. Lastly, the pinch bolt. You've already addressed that one. Something to try: place a jack on the central lifting point. The donut on the belly pan. And incrementally jack up whilst steering to take weight off suspension. If the noise reduces and then stops altogether, it is one of the three items above. Good luck. |
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01-02-2021, 03:56 PM | #11 | |
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Attaching some photos to show what I mean
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01-02-2021, 03:59 PM | #12 |
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Yeah I made sure to get new ones as well, and put them in the correct orientation with the bolt head facing forward. At this point, I've ruled this out...
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01-02-2021, 05:52 PM | #13 | |
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Are the perches metal? Is there anything between the top of the perch and the bottom of the spring? I've seen springs in metal perches make noise as the spring skips around the perch under load (spring is more unloaded when wheels are off the ground so that may be why you didn't see it). A thrust sheet/bearing there would be how to fix it, if that's where the noise is coming from, but you could try lubricating that area with a lightweight oil and then seeing if the noise is still there to test. |
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01-02-2021, 07:03 PM | #14 | ||||
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Do you have any recs on what kind of lubricant to use there? between the springs and the perch and the springs themselves.. wondering what else I should try at this point.
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01-02-2021, 07:06 PM | #15 | |
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Okay, so to eliminate the noise coming from the spring rotating on the lower surface (which would mean the top hat bearings g isn't working as it should), take a marker and draw a line on the spring relative to a feature on the adjusting collar. That key slot in the pic for example. Then rotate steering in both directions and see if the spring rotates with the adjuster as it should. Normally you get multiple clicks when the coil is skidding on the bottom surface, as it binds and slips, binds and slips. My money is still on the top strut nut not done up tight enough. Drop an 18mm socket onto it and try tighten it. If it rotates with the damper rod, it probably isn't tight enough. Whilst in the engine bay, just double check the top hat bolts too. |
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01-02-2021, 09:16 PM | #16 | |
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01-03-2021, 01:21 AM | #17 | ||||
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At this point, signs are pointing to the tophat bearing?? Not 100% sure, but definitely seems like it could be the culprit. If the spring was skipping, I feel like it would be more of a popping noise than this clicking.
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02-04-2021, 11:47 AM | #18 | |||||
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02-07-2021, 01:46 PM | #19 |
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I can confirm it has nothing to do with the springs or lowering kit. My stock suspension started to do this after Camber plate install. Replacing the pinch bolt was a temporary fix. Noise came back, Doesn't effect drivability, I've tracked the car since a few times without issue. However after just disregarding it for some time, i think it went away again? lol
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02-09-2021, 10:28 AM | #20 | ||
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Still unclear what the main issue is.
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08-23-2021, 05:48 PM | #21 |
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I'd love to chime in on this. I've been dealing with this very issue since lowering my car early this year. Turns out someone might have figured it out.
I think the key to solving this is the removal of the bracket in between the pinch point(later in the video when he goes back over it in more detail) |
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