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      06-02-2013, 03:03 PM   #1
Black Dog
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Question How to remove front strut mount nut?

Hi,
I have KW V 1 on my e92 335i and I want to replace front strut mounts, but I don't know what kind of tool I need to remove strut mount nuts(http://www.e90post.com/forums/showthread.php?t=336355 - step number 10 from this DIY).
Every time I try to unscrew the nut it turns together with the shock.

I contacted KW but they told me to ask my local dealer and I decided to ask here first.
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      06-02-2013, 03:18 PM   #2
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Use an Impact wrench while there is load on the suspension and it should come loose quick and easy.
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      06-02-2013, 03:37 PM   #3
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Quote:
Originally Posted by Dr. G View Post
Use an Impact wrench while there is load on the suspension and it should come loose quick and easy.
Thank you for reply. I will try this.
But as far as I remember from when I tried to unscrew the nut around year ago I tried different ways of unscrewing it both with compressed and uncompressed spring...
And I believe I can't reach the nut without jacking up a car and removing a strut.

I mean I haven't tried impact wrench yet, but maybe there are more options for removing the nut?
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      06-02-2013, 03:47 PM   #4
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I use a 21mm spark plug socket (you may be able to get a 13/16 to fit too) and put an allen key through the top hole to hold the strut. Then I turn it with the hex part near the top of the socket.
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      06-02-2013, 04:11 PM   #5
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Quote:
Originally Posted by PINeely
I use a 21mm spark plug socket (you may be able to get a 13/16 to fit too) and put an allen key through the top hole to hold the strut. Then I turn it with the hex part near the top of the socket.
+1. As I recall an offset wrench on the top nut allowing you to use the tool to hold the strut bolt from rotating.
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      06-02-2013, 04:13 PM   #6
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Quote:
Originally Posted by PINeely View Post
I use a 21mm spark plug socket (you may be able to get a 13/16 to fit too) and put an allen key through the top hole to hold the strut. Then I turn it with the hex part near the top of the socket.
Good post, this will work if you have the spark plug socket at your disposal. 13/16 works pretty good with a 12-point socket as well.

I think the allen key size was 6mm. If you don't have a spark plug socket you could try vice gripping the socket or using a pipe wrench, or maybe grinding it to give two flat surfaces to grab onto with a wrench.

I use an impact for removal since it's the quickest.
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      06-02-2013, 04:15 PM   #7
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Quote:
Originally Posted by Black Dog View Post
Thank you for reply. I will try this.
But as far as I remember from when I tried to unscrew the nut around year ago I tried different ways of unscrewing it both with compressed and uncompressed spring...
And I believe I can't reach the nut without jacking up a car and removing a strut.

I mean I haven't tried impact wrench yet, but maybe there are more options for removing the nut?

You can reach the nut from the engine bay, you just need to remove one screw and move the bar over top of the strut out of the way. Then remove the dust cover on top of the strut and the impact will remove the nut easily.
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      06-02-2013, 04:47 PM   #8
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Thank you for help. I will try both methods.
This time the nut has no chance.
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      06-02-2013, 09:02 PM   #9
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If you remove the nut using a spark plug socket and allen key, how do you assemble it back to spec? most torque wrenches won't give you an opening to use the allen key, no?

Or do most ppl just tighten until snug w/o use of torque wrench?

Another question is, if you loosen the top nut from the engine bay, how do you remove the strut after that? I'd imagine when you take the load off, the spring will uncompress and be at its tallest state -- can you still angle the strut off under the fender to remove?
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      06-03-2013, 09:47 AM   #10
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I did this like 3 weeks ago and I used this open socket with a torque wrench

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      06-03-2013, 10:06 AM   #11
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Quote:
Originally Posted by NJ330i
I did this like 3 weeks ago and I used this open socket with a torque wrench

Is that the knuckle spreader on the left? Where did u buy these?
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      06-03-2013, 11:17 PM   #12
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Quote:
Originally Posted by wheen View Post
If you remove the nut using a spark plug socket and allen key, how do you assemble it back to spec? most torque wrenches won't give you an opening to use the allen key, no?

Or do most ppl just tighten until snug w/o use of torque wrench?

Another question is, if you loosen the top nut from the engine bay, how do you remove the strut after that? I'd imagine when you take the load off, the spring will uncompress and be at its tallest state -- can you still angle the strut off under the fender to remove?
To answer the first question, the nut is usually a lot more compliant about being tightened than coming off. Use the plug socket and allen key to get it started and then finish it with the torque wrench. Usually it won't spin the strut that way.

As for the second question, you have to use spring compressors to take the load out of the spring. I usually use four; two to take the strut out and then when I am putting the mount back on I use two more with an impact wrench to compress them quickly and totally. You can do it with two but four makes it easier.
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      06-04-2013, 12:43 AM   #13
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Thanks -- that's real helpful info. My car only has like 7400 mi but I'm considering buying a new set of top hats, just so I can pre-assemble the front struts before the actual install day. I'm hoping that way I won't have to make use of spring compressors on the day of the install.
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      06-04-2013, 12:56 AM   #14
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That would save you huge amounts of time for sure! And wrestling with spring compressors for 30 minutes is no fun.
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      06-04-2013, 11:16 AM   #15
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Quote:
Originally Posted by wheen View Post
Is that the knuckle spreader on the left? Where did u buy these?
Yes that is the knuckle spreader. Got them on ebay for like $40 for both.

http://www.ebay.com/itm/171010535098...84.m1497.l2649
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      06-04-2013, 11:29 AM   #16
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Thanks! Was it actually the 19mm that you bought?

Edit: Seems ECS has both the 21mm socket and the spreader tool too, but the spreader part number is 3435 (vs 3424). Perhaps 3424 is more Audi/VW spec'ed? -- nope i'm wrong, ECS application guide lists audi/vw models for 3435. maybe it's the same thing.

Last edited by wheen; 06-04-2013 at 12:11 PM.
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      06-04-2013, 01:26 PM   #17
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Quote:
Originally Posted by wheen View Post
Thanks! Was it actually the 19mm that you bought?

Edit: Seems ECS has both the 21mm socket and the spreader tool too, but the spreader part number is 3435 (vs 3424). Perhaps 3424 is more Audi/VW spec'ed? -- nope i'm wrong, ECS application guide lists audi/vw models for 3435. maybe it's the same thing.
Yes I bought the 19mm but you have to check what size nut you have on your struts. The spreader worked fine on the e90.
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      06-05-2013, 10:57 PM   #18
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Quote:
Originally Posted by NJ330i View Post
Yes I bought the 19mm but you have to check what size nut you have on your struts. The spreader worked fine on the e90.
Great info -- thank you sir!
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      06-06-2013, 07:11 AM   #19
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Great info -- thank you sir!
No problem
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      06-06-2013, 01:46 PM   #20
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Forget the spreader, I just used a screwdriver and rubber mallet. The sparkplug socket/allen key trick works great!
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      06-09-2013, 06:53 AM   #21
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I tried the impact wrench with suspension under load method and the shock still turned together with the nut.
I haven't properly tried the other method though. Hopefully it will work for me. Will let you know once I get under the car.
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      11-10-2013, 11:43 PM   #22
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Was looking for other info. Sure OP already got it all done, but this makes it really easy

http://www.harborfreight.com/21-piec...set-67974.html

If it's not obvious from the picture....it's a pass through socket set. Spin the nut with the socket (even has a hollow extension) while holding an allen wrench on the stub.
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