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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > Suspension | Chassis | Brakes > Droplink reminder
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      08-19-2019, 01:42 AM   #1
Loopcifur
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Hey all,

Fitted my coilovers this weekend and just wanted to give everyone a reminder to tighten your droplinks!

Obvious i know but for a day and a half ive been chasing a clang/knock coming from the nearside which was really audible.

Read many threads from people asking questions but not stating if and how they fixed it which was frustrating so thought I'd at least provide a potential remedy!

So I checked and torqued up the tophat bolts, strut bolts the works on the coilovers... Nothing got rid of the knock.

Last option was to start again and pull the strut where I then removed the droplink nut. As i moved the droplink out of the way it made the 2same noise... I moved it again and thought... 'Surely not', but the noise was coming from the other side. Looked like the ARB was knocking.

Whipped it all back together, pulled the far side wheel off and everything felt tight no movement at all??

I put an axle stand under the strut andc dropped the car to provide some load and there was the tighniest sogn of movement so literally tightened the droplink bolt half a turn on the strut and voila... Its gone!! No more clangs bangs or knocks!

So lessons to be learnt, make sure even the smallest of nuts is tightened fully because even a half turn on a nut will cause the biggest knocks!
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      08-19-2019, 04:01 AM   #2
dsc888
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Great write up! Was the knock over all bumps or was it over certain ones (bigger and perhaps only on one side when one it would cause the anti-roll bar to be put on tension)?

I'm asking as I just had my B8s and Eibachs installed and am getting a random "knock" like I have 80 psi in my driver's front tire. It drives fine otherwise. The noise seems to occur mostly if I go over rough roads or if my driver's side rooms over a bump/dip causing that one wheel to travel where as the passenger wheel stays relatively level. It doesn't occur with every bump though. Odd.

I checked the strut mount and the center strut bolt and both seems OK and tight.

Did you torque it down to a certain spec also?
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      08-20-2019, 12:55 AM   #3
Loopcifur
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Quote:
Originally Posted by dsc888 View Post
Great write up! Was the knock over all bumps or was it over certain ones (bigger and perhaps only on one side when one it would cause the anti-roll bar to be put on tension)?

I'm asking as I just had my B8s and Eibachs installed and am getting a random "knock" like I have 80 psi in my driver's front tire. It drives fine otherwise. The noise seems to occur mostly if I go over rough roads or if my driver's side rooms over a bump/dip causing that one wheel to travel where as the passenger wheel stays relatively level. It doesn't occur with every bump though. Odd.

I checked the strut mount and the center strut bolt and both seems OK and tight.

Did you torque it down to a certain spec also?
The noise was quite random, happened more at lower speeds amd whilst it did clang a lot over big bumps you would get the occasional squeak or knock over smaller bumps, but especially at lower speeds.

It threw me as the sound was all over the place but i was adament it was front left, the noise was just transmitting though and it was the opposite side.

No torque settings i found... I just put a 14mm spark plug socket on the top nut of the droplink (its a perfect fit) , fed a t30 torx through to hold the link so it didnt spin and then tightened it as much as possible with a ratchet spanner.
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      09-11-2019, 07:47 AM   #4
JaredG_F30
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What size is the pass-through socket needed to remove the drop link nut to the strut?
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      09-18-2019, 12:56 AM   #5
Loopcifur
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As above "... I just put a 14mm spark plug socket on the top nut of the droplink (its a perfect fit) , fed a t30 torx through to hold the link so it didnt spin and then tightened it as much as possible with a ratchet spanner."

Hope this helps.
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