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      10-31-2021, 04:57 PM   #1
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How many folks are replacing TTY bolts and reindexing bushings?

I splurged on a TIS membership for the day and I came away with this question...

Although shops are doing spring installs for pretty cheap, it seems very rare that any shop outside of a dealer will replace these bolts or reindex the bushings for the new drop.

I haven't seen these steps mentioned in the MSS or any one else DIY video/instructions. No wonder BMW charges what they do since they go by the book procedure and time which does seem to have its benefits.

How important are each of these steps? Admittedly, as kids working on cars I never knew what a torque spec even was let alone a TTY bolt or indexing a bushing. "Very snug" seemed to get us by.

TIS is quite the source of info! I even went to the jacking section where it clearly states the use of the rear differential as a jack point. No mention of caution due to the fins or anything.
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      10-31-2021, 08:45 PM   #2
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Good questions. I can only share a couple relevant articles that I just found.

https://autoexpert.com.au/questions-...rench-rotation

https://www.onestopauto.com/Why-shou...e-re-used.html
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      11-04-2021, 12:05 PM   #3
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I always replace TTY bolts and preload the bushings when installing suspension components.
The BMW installation manual of the F87 M Performance HAS, however, does not specify clocking the bushings.
Probably because the KW supplied MP HAS does not go as low as the aftermarket version.
I guess for moderate drop (<1"), not clocking the bushings does not have much adverse effect than the more aggressive drops.
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      11-08-2021, 07:30 AM   #4
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The shop I used asked if I wanted to replace the tty bolts when they did my AST springs and I said yes. I went with them because they were the only shop to bring it up. I'm glad they did however my new issue is that I'm getting a creaking noise in the front over certain bumps. It almost sounds like rubbing (I do have 15mm spacers and Pzeros) but I can't confirm. I took it back to them and they adjusted the top mounts and springs in the perches and it got rid of ~85% of the noise but I still hear it at times... it's driving me crazy tbh. Not sure what could be causing it. There are no bushings up front to reindex are there?
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      11-08-2021, 09:17 AM   #5
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Quote:
Originally Posted by JTO24 View Post
The shop I used asked if I wanted to replace the tty bolts when they did my AST springs and I said yes. I went with them because they were the only shop to bring it up. I'm glad they did however my new issue is that I'm getting a creaking noise in the front over certain bumps. It almost sounds like rubbing (I do have 15mm spacers and Pzeros) but I can't confirm. I took it back to them and they adjusted the top mounts and springs in the perches and it got rid of ~85% of the noise but I still hear it at times... it's driving me crazy tbh. Not sure what could be causing it. There are no bushings up front to reindex are there?
Yikes. First time I've heard of that issue. Please let us know what you end up finding out.
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      11-08-2021, 07:14 PM   #6
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Quote:
Originally Posted by JTO24 View Post
The shop I used asked if I wanted to replace the tty bolts when they did my AST springs and I said yes. I went with them because they were the only shop to bring it up. I'm glad they did however my new issue is that I'm getting a creaking noise in the front over certain bumps. It almost sounds like rubbing (I do have 15mm spacers and Pzeros) but I can't confirm. I took it back to them and they adjusted the top mounts and springs in the perches and it got rid of ~85% of the noise but I still hear it at times... it's driving me crazy tbh. Not sure what could be causing it. There are no bushings up front to reindex are there?
Interesting. I have the same exact issue. With AST springs. Squeaking noise coming from my front passenger side. I'm hoping it goes away as it's only been about 2 weeks since install and I haven't gotten my alignment done yet. Interesting to hear I'm not the only one.
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      11-09-2021, 08:33 AM   #7
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Quote:
Originally Posted by abrush32 View Post
Interesting. I have the same exact issue. With AST springs. Squeaking noise coming from my front passenger side. I'm hoping it goes away as it's only been about 2 weeks since install and I haven't gotten my alignment done yet. Interesting to hear I'm not the only one.
Oh, wow good to know! Mine, too was mainly coming from the passenger side. When the shop adjusted things the passenger side seems quiet but then it sounded like the driver side was making a little bit of noise still.. they tried adjusting the driver's side and I still hear it. I just did my alignment about 8 days post-install and the noise was still there... curious to know what it could be.

tom @ eas you guys have installed a few of these sets now... any complaints about this sort of noise or what the root cause could be, in case of improper install?
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      11-09-2021, 03:07 PM   #8
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Quote:
Originally Posted by JTO24 View Post
Oh, wow good to know! Mine, too was mainly coming from the passenger side. When the shop adjusted things the passenger side seems quiet but then it sounded like the driver side was making a little bit of noise still.. they tried adjusting the driver's side and I still hear it. I just did my alignment about 8 days post-install and the noise was still there... curious to know what it could be.

tom @ eas you guys have installed a few of these sets now... any complaints about this sort of noise or what the root cause could be, in case of improper install?
Only had 1 return, and it was for an unrelated issue (brake shield was making contact with rotor).

Likely install related. Shop needs to make sure all bolts are torqued properly and rubber spring insulator isn't torn. Usually we'll add a light layer of grease before seating the spring so this doesn't happen. If the boot is already torn, it will need replacement.
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      11-23-2021, 10:22 AM   #9
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Quote:
Originally Posted by tom @ eas View Post
Only had 1 return, and it was for an unrelated issue (brake shield was making contact with rotor).

Likely install related. Shop needs to make sure all bolts are torqued properly and rubber spring insulator isn't torn. Usually we'll add a light layer of grease before seating the spring so this doesn't happen. If the boot is already torn, it will need replacement.
So update on my creaking noise: I ended up taking it to the dealer for a second set of eyes after the original shop tried to fix it. Dealer said the springs were "collapsing onto themselves" meaning that when compressed, one coil was hitting the adjacent cool. They said they applied grease to them to lessen the impact and reduce the noise. My concern is, should the springs be doing that? To me, grease seems like a temporary fix since it could get washed away with rain water etc.

What do you guys think?
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      11-23-2021, 11:35 AM   #10
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Quote:
Originally Posted by JTO24 View Post
So update on my creaking noise: I ended up taking it to the dealer for a second set of eyes after the original shop tried to fix it. Dealer said the springs were "collapsing onto themselves" meaning that when compressed, one coil was hitting the adjacent cool. They said they applied grease to them to lessen the impact and reduce the noise. My concern is, should the springs be doing that? To me, grease seems like a temporary fix since it could get washed away with rain water etc.

What do you guys think?
And yours definitely had the black rubber covers on the top coils? That sounds like a temporary fix for sure, and I hope this isn't a common thing and that you can get it addressed if it comes back.
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      11-23-2021, 01:04 PM   #11
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Quote:
Originally Posted by mattssi View Post
And yours definitely had the black rubber covers on the top coils? That sounds like a temporary fix for sure, and I hope this isn't a common thing and that you can get it addressed if it comes back.
I'm going to swap my winter wheels on this week and check the orientation of the springs to look for those black rubber isolators. Can the springs be installed upside down? Or is one end bigger than the other that they only fit one way?

I just picked up the car and can't hear any noise which is good. They only charged me $76; not even a full hour's worth of work. Plus, they finally were able to do the diff fluid for the break-in service as when I had it done originally a few weeks ago they didn't have any diff fluid in stock.
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      11-23-2021, 01:30 PM   #12
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I think both could be installed upside down, but I would be surprised. The rears easier than the fronts. I installed mine rubber covers up in the front and the rears with the part number printed on the spring right-side-up.
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      11-23-2021, 01:56 PM   #13
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Quote:
Originally Posted by JTO24 View Post
So update on my creaking noise: I ended up taking it to the dealer for a second set of eyes after the original shop tried to fix it. Dealer said the springs were "collapsing onto themselves" meaning that when compressed, one coil was hitting the adjacent cool. They said they applied grease to them to lessen the impact and reduce the noise. My concern is, should the springs be doing that? To me, grease seems like a temporary fix since it could get washed away with rain water etc.

What do you guys think?
Most likely your insulator boots are torn (#8, diagram from F8x catalog).

Most shops use a light coating of grease on the boot when assembling to prevent this from happening during installation.
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      11-23-2021, 03:25 PM   #14
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Quote:
Originally Posted by tom @ eas View Post
Most likely your insulator boots are torn (#8, diagram from F8x catalog).

Most shops use a light coating of grease on the boot when assembling to prevent this from happening during installation.
Thanks, Tom... I asked the shop and they claim the boots were fine when I brought it in the second time to try to fix it. As for the tear, where on the boot would it tear? At the top? If so, do you guys just apply some grease to that area?

What about the spring itself? Is there a proper orientation like the printed part number should face up/ the rubber isolators on the spring itself should be near the top? Sorry for asking all these questions but I appreciate everyone's support!
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      11-23-2021, 03:27 PM   #15
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Quote:
Originally Posted by JTO24 View Post
Thanks, Tom... I asked the shop and they claim the boots were fine when I brought it in the second time to try to fix it. As for the tear, where on the boot would it tear? At the top? If so, do you guys just apply some grease to that area?

What about the spring itself? Is there a proper orientation like the printed part number should face up/ the rubber isolators on the spring itself should be near the top? Sorry for ask the questions but I appreciate everyone's support!
It'll tear at the upper lip where the spring seats. If torn, they need to be replaced.

Springs are tapered, they cannot be installed upside down.
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      11-23-2021, 03:54 PM   #16
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Quote:
Originally Posted by mattssi View Post
I think both could be installed upside down, but I would be surprised. The rears easier than the fronts. I installed mine rubber covers up in the front and the rears with the part number printed on the spring right-side-up.
It sounds like according to Tom, the fronts can only go in the way you have them, so that's good at least lol
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      11-29-2021, 10:41 AM   #17
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So the saga continues... greasing the coils was just a temporary solution. When I swapped my winter wheels on yesterday and had the suspension decompressed it must've removed/displaced some grease as the noise is back to almost as bad as it was originally.

Per Tom's feedback, I purchased two new dust boots (just in case) and am bringing the car to AutoCouture next week for them to check out.
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      12-09-2021, 08:48 AM   #18
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Sorry OP, I know this is off topic and I'll be done after this post but wanted to give a final update on my noise situation... purchased new dust boots and took the car to Autocouture to have them take a look. They replaced the dust boots and reinstalled everything the way they would normally do it and so far on the 2 hr ride home I have no noise! They told me the original install looked good for the most part and the original boots were still in tact. They did notice the bottom rubber spring isolator was maybe a little shifted but not sure if that contributed to the noise.

Anyway, I'm happy now... I guess to tie it together with the OP's question, I had zero issues on the rear where TTY bolts were replaced
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      12-09-2021, 02:13 PM   #19
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Glad you got it resolved! Very strange, but it's part of the fun I guess. Thanks for the update!
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