Suspension Shock replacement advice
#1
03-15-2019, 05:04 PM
Shock replacement advice
I'm going to be replacing my shocks in a few weeks. I'm going with the Koni "special active" (the old FSD) since Im not lowering. That is not what this thread is about.
This is the first MAJOR job I'll be doing myself. I've been doing oil changes and routine maintenance for years and Youtube has given me the confidence to tackle something bigger.
From those who have done this at home, what advice or recommendations do you have? Any specialty tools I should acquire in advance? Resources or threads I should read. Tips & tricks?
This is the first MAJOR job I'll be doing myself. I've been doing oil changes and routine maintenance for years and Youtube has given me the confidence to tackle something bigger.
From those who have done this at home, what advice or recommendations do you have? Any specialty tools I should acquire in advance? Resources or threads I should read. Tips & tricks?
#2
03-17-2019, 12:21 PM
#3
03-17-2019, 01:10 PM
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my_wifes_mini (03-17-2019)
#4
03-17-2019, 02:18 PM
Alliance Member
As mentioned, pretty straight forward if you are mechanically inclined.
Tool? Make sure you have a spring compressor. One of these can be helpful, too:
https://www.ecstuning.com/b-schwaben...-tool/scw3435/
Make sure when replacing the lower mount bolt into the control arm that it threads smoothly, and the lower shock mount is seated correctly before torqueing. Havein that bolt snap or strip makes the job much more cumbersome.
Tool? Make sure you have a spring compressor. One of these can be helpful, too:
https://www.ecstuning.com/b-schwaben...-tool/scw3435/
Make sure when replacing the lower mount bolt into the control arm that it threads smoothly, and the lower shock mount is seated correctly before torqueing. Havein that bolt snap or strip makes the job much more cumbersome.
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#6
03-17-2019, 06:23 PM
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#7
03-18-2019, 03:58 AM
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#8
03-18-2019, 04:09 AM
Alliance Member
The gen 2 is a little bit better there, with a bolt and a nut. Still a chance it could be rusted and break. But if it is and does, won’t have to replace the whole knuckle.
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my_wifes_mini (03-18-2019)
#9
03-18-2019, 04:25 AM
#10
03-24-2019, 11:02 AM
As stated, a spring compressor is required. Have plenty of respect for the amount of energy stored in the spring, take your time and get the compressors setup so that the spring compresses evenly and straight. Get some PB blaster and soak down the spindle where the shock mounts. It is likely locked up and will need to be knocked free with a hammer (hit the spindle vertically down, with the strut still tight to the body at the upper mount).
When removing the pinch bolt, loosen the bolt head, not the nut. The nut is serrated and bites into the spindle (the Bentley Manual gave me this tip, and indicates to tighten the bolt head when reassembling). Depending on the amount of corrosion between the bolt and spindle, this not be possible, you may still need to remove the nut. Either way, this bolt will be tight (like a wheel bolt).
While everything is apart, do a good inspection of the old parts. Strut mounts and sway bar end links loosen up over time.
Make sure that you stay organized on how the washers go between the spring mount and strut mount. If they go together wrong, the steering will not return properly (ask me how I know).
Have fun,
Mike
When removing the pinch bolt, loosen the bolt head, not the nut. The nut is serrated and bites into the spindle (the Bentley Manual gave me this tip, and indicates to tighten the bolt head when reassembling). Depending on the amount of corrosion between the bolt and spindle, this not be possible, you may still need to remove the nut. Either way, this bolt will be tight (like a wheel bolt).
While everything is apart, do a good inspection of the old parts. Strut mounts and sway bar end links loosen up over time.
Make sure that you stay organized on how the washers go between the spring mount and strut mount. If they go together wrong, the steering will not return properly (ask me how I know).
Have fun,
Mike
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#11
03-24-2019, 02:33 PM
A few of things...
- Rear shock replacement - the bottom bolt is self tapping. And there are no “real” threads in the aluminum lower control arm. That is, the threads are what were made when the bolt was put in a drilled (not tapped) hole at the factory. Disassembly should not be an issue. Soak the bolt end opening in the control arm with rust buster of some sort. When installing the new shocks be very careful to align the tapered section of the shock mount in the receiver location in the control arm and then hand thread the bolt in. You may have to use your other hand to hold the shock in place so the bolt threads in straight and smoothly. Only thread it in by hand most of the way. If it starts to get cross threaded, stop, back it out and start over. If you try to force it, it will cross thread easily, you will have weak threads and it may pull out over time, while you are driving and drop the car on the road. I found that a little never-seize on the bolt threads helped with the hand threading. Note, the factory torque for these is very high, but is intended to include the initial cutting of the threads. There is no reassembly torogue that I am aware of. The bolt is 14mm, same as the wheel bolts and the wheel bolts are torqued to 102 ft-lbs. I used that as my guide. There are ways to fix lower control arm if the threads are stripped, but we won’t get into that because I know you will be careful (but, if needed, I have done that repair)
- The front shock tube is too long to pull out of the steering knuckle easily. I took a 2”x2” piec of wood that was long enough to reach from the underside of the spring perch to just below the lower control arm. I held it in place with duct tap and used a floor jack to compress the spring a little and allow the steering knuckle to slide off. Do that again to do the reassembly.
- you will need a way to loosen and tighten the nut on the top of the strut. While still on the car, I loosened the nut with an impact wrench. Don’t tighten it with an impact wrench as you can snap off the stem. For tightening I used an old school 13/16th sparkplug socket that has the hex on top. I put a wrench on that and the Allen wrench down through the 1/2” drive hole. However, I seem to remember the FSDs had a smaller nut than the MINI shocks, which was a PIA. Sorry.
- I bought 2 sets of spring compressors from Harbor Freight and used 3 of 4 compressor turnbuckles to compress the spring. I found this made it easier to compress the spring easily and evenly. Never have the spring or the far end of the shock pointed at your face or other part of your body when the spring is compressed with those tools.
- You will need both wheels off the ground when doing the fronts and then again when doing the rears.
Hope this helps...
- Rear shock replacement - the bottom bolt is self tapping. And there are no “real” threads in the aluminum lower control arm. That is, the threads are what were made when the bolt was put in a drilled (not tapped) hole at the factory. Disassembly should not be an issue. Soak the bolt end opening in the control arm with rust buster of some sort. When installing the new shocks be very careful to align the tapered section of the shock mount in the receiver location in the control arm and then hand thread the bolt in. You may have to use your other hand to hold the shock in place so the bolt threads in straight and smoothly. Only thread it in by hand most of the way. If it starts to get cross threaded, stop, back it out and start over. If you try to force it, it will cross thread easily, you will have weak threads and it may pull out over time, while you are driving and drop the car on the road. I found that a little never-seize on the bolt threads helped with the hand threading. Note, the factory torque for these is very high, but is intended to include the initial cutting of the threads. There is no reassembly torogue that I am aware of. The bolt is 14mm, same as the wheel bolts and the wheel bolts are torqued to 102 ft-lbs. I used that as my guide. There are ways to fix lower control arm if the threads are stripped, but we won’t get into that because I know you will be careful (but, if needed, I have done that repair)
- The front shock tube is too long to pull out of the steering knuckle easily. I took a 2”x2” piec of wood that was long enough to reach from the underside of the spring perch to just below the lower control arm. I held it in place with duct tap and used a floor jack to compress the spring a little and allow the steering knuckle to slide off. Do that again to do the reassembly.
- you will need a way to loosen and tighten the nut on the top of the strut. While still on the car, I loosened the nut with an impact wrench. Don’t tighten it with an impact wrench as you can snap off the stem. For tightening I used an old school 13/16th sparkplug socket that has the hex on top. I put a wrench on that and the Allen wrench down through the 1/2” drive hole. However, I seem to remember the FSDs had a smaller nut than the MINI shocks, which was a PIA. Sorry.
- I bought 2 sets of spring compressors from Harbor Freight and used 3 of 4 compressor turnbuckles to compress the spring. I found this made it easier to compress the spring easily and evenly. Never have the spring or the far end of the shock pointed at your face or other part of your body when the spring is compressed with those tools.
- You will need both wheels off the ground when doing the fronts and then again when doing the rears.
Hope this helps...
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#12
03-27-2019, 06:55 PM
#13
03-27-2019, 10:01 PM
Moderator
Excellent advice above. One other tip - put Loctite Blue on the threads for the pinch bolt and sway bar end links when you reassemble. The nuts on the swaybar endlinks have a self locking feature that only works once (at factory install) and when you remove and replace them they will loosen up, causing horrible rattling. And I had both pinch bolts loosen up even though I had torqued them to spec, which caused low speed clunking over bumps.
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#14
03-28-2019, 05:45 AM
https://www.northamericanmotoring.co...ml#post4153735
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#15
03-28-2019, 06:51 AM
https://www.waymotorworks.com/koni-s...7-r58-r59.html
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#16
04-01-2019, 05:56 PM
#17
04-01-2019, 06:46 PM
Alliance Member
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#18
04-01-2019, 06:48 PM
front:
road wheel to hub 103 ft-lb (+-7)
strut assembly pinch bolt (tighten bolt only) 74 ft-lb
strut upper bearing to strut tower (replace collar nut) 25 ft-lb
tie rod end to steering knuckle 48 ft-lb
stabilizer link to strut housing 41 ft-lb
strut shaft to strut top bearing 47 ft-lb
rear:
rear strut lower mount to trailing arm 122 ft-lb
rear strut upper mount to body 41 ft-lb
upper strut mount to strut shaft 22 ft-lb
road wheel to hub 103 ft-lb (+-7)
strut assembly pinch bolt (tighten bolt only) 74 ft-lb
strut upper bearing to strut tower (replace collar nut) 25 ft-lb
tie rod end to steering knuckle 48 ft-lb
stabilizer link to strut housing 41 ft-lb
strut shaft to strut top bearing 47 ft-lb
rear:
rear strut lower mount to trailing arm 122 ft-lb
rear strut upper mount to body 41 ft-lb
upper strut mount to strut shaft 22 ft-lb
Last edited by yesti; 04-01-2019 at 07:00 PM.
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#19
04-02-2019, 06:07 AM
Do you know if the 122 ft-lb torque to the trailing arm is for the initial installation at the factory, where the bolt is cuttting threads, or is it for reinstallation of the bolt?
The reason I ask is, if the 122 ft-lb is for the initial installation at the factory, then part of that torque is going towards cutting the threads in the aluminum trailing arm and is not going into the actual load to retain the shock in place. That torque is also not going into creating stress in those new thread. If that torque is then used as part of a reinstallation, then that torque is not being used to cut new threads which results in it now creating a higher level of stress in the threads than there would be from the initial factory installation. This issue has come up before in other thread discussions on this topic of installing replacement shocks, but my recollection is that no one could come up with a BMW/MINI “reinstallation” torque. The option was to use standard guidelines for that size bolt, which would be more in line with the wheel bolt torque (~100 ft-lbs). The concern is the potential for stripping out the threads in the control arm with the higher torque value.
As for the strut shaft to bearing torque, this has to be held by an 8mm Allen wrench. But, I found that the Craftsman Allen wrench I was using wasn’t strong (large) enough to withstand that torque. Not sure how to get to that torque with a 8mm Allen wrench; maybe the special tool you can buy will get there.
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#20
04-02-2019, 07:31 AM
Just to get everything in one place for the future.
https://www.northamericanmotoring.co...ll-how-to.html
https://www.northamericanmotoring.co...ll-how-to.html
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930 Engineering (12-02-2020)
#21
04-02-2019, 07:38 AM
#23
04-02-2019, 08:47 AM
The option that I used was a 13/16" old school spark plug socket for the MINI nut:
You can get these any where. I used an open end wrench on the hex (crow's foot for the torque wrench) and the Allen wrench went down through the socket drive hole in the top.
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my_wifes_mini (04-02-2019)
#24
04-02-2019, 06:58 PM
Two things...
Do you know if the 122 ft-lb torque to the trailing arm is for the initial installation at the factory, where the bolt is cuttting threads, or is it for reinstallation of the bolt?
As for the strut shaft to bearing torque, this has to be held by an 8mm Allen wrench. But, I found that the Craftsman Allen wrench I was using wasn’t strong (large) enough to withstand that torque. Not sure how to get to that torque with a 8mm Allen wrench; maybe the special tool you can buy will get there.
Do you know if the 122 ft-lb torque to the trailing arm is for the initial installation at the factory, where the bolt is cuttting threads, or is it for reinstallation of the bolt?
As for the strut shaft to bearing torque, this has to be held by an 8mm Allen wrench. But, I found that the Craftsman Allen wrench I was using wasn’t strong (large) enough to withstand that torque. Not sure how to get to that torque with a 8mm Allen wrench; maybe the special tool you can buy will get there.
The strut shaft bearing torque would require the special tool, we managed to get it to seat without it.
Last edited by yesti; 04-02-2019 at 07:06 PM.
#25
04-02-2019, 07:01 PM
collar nuts
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