Top mounts rattling after swapping out..!

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webrits
Joined: Wed 13 May, 2015 22:25
Posts: 12

  Z3 roadster 2.8

Top mounts rattling after swapping out..!

Post by webrits » Thu 17 Sep, 2015 22:27

After getting sick of some little knocking from the rear I decided to swap out both top mounts.
Problem is they're both now making more noise than they ever did!!
Wtf?
Anyone know why that might be? Is there something obvious I've done wrong?

Thanks all.

Mugs
Joined: Wed 07 Aug, 2013 02:26
Posts: 341

  Z3 roadster 1.9

Re: Top mounts rattling after swapping out..!

Post by Mugs » Fri 18 Sep, 2015 21:16

have you got the dished washers on the top the right way round?
they should be cupped away from the mount. i found out the hard way and put them on upside down and they rattled like hell.

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Southernboy
Joined: Thu 07 Oct, 2010 13:39
Posts: 6312

  Z3 roadster 3.0i
Location: Johannesburg

Re: Top mounts rattling after swapping out..!

Post by Southernboy » Sat 19 Sep, 2015 08:08

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webrits
Joined: Wed 13 May, 2015 22:25
Posts: 12

  Z3 roadster 2.8

Re: Top mounts rattling after swapping out..!

Post by webrits » Sat 19 Sep, 2015 09:51

Yup, that's how I have it...!

Mike Fishwick
Joined: Fri 19 Jun, 2009 11:27
Posts: 1991

  Z3 roadster 2.8
Location: Daglan, France

Re: Top mounts rattling after swapping out..!

Post by Mike Fishwick » Sat 19 Sep, 2015 11:19

Did you replace the gasket between the mount and the body? I find that two gaskets make a difference.

Also - did you use the original nuts with built-in washers? use of ordinary nuts with washers is known to generate noise.

Mod edit -Gazza
A Z3 is not just for Christmas - it's for life!

Hairyscreech
Joined: Thu 16 Apr, 2015 13:08
Posts: 69

  Z3 roadster 2.8

Re: Top mounts rattling after swapping out..!

Post by Hairyscreech » Sun 20 Sep, 2015 02:41

Are you sure it is the top mounts?

Could it be the "vibration dampers" the 6 cylinder cars have hidden behind the bumpers?

webrits
Joined: Wed 13 May, 2015 22:25
Posts: 12

  Z3 roadster 2.8

Re: Top mounts rattling after swapping out..!

Post by webrits » Sun 20 Sep, 2015 16:46

Pretty sure it's the top mounts based on the location of the rattle.
Maybe I'll try 2 gaskets as our very own language expert suggested....!

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Gazza
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Joined: Tue 04 Oct, 2005 21:58
Posts: 9220

  M roadster S54
Location: East London/Essex

Re: Top mounts rattling after swapping out..!

Post by Gazza » Sun 20 Sep, 2015 18:47

To test the mounts,get a friend to ride along with you and feel the mount from inside the car, they do move slightly but anything above slight indicates a problem.
Gazza

"Understeer is when you hit the wall with the front of the car, oversteer is when you hit the wall with the rear of the car. Horsepower is how fast you hit the wall and torque is how far you take the wall with you"

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Del
Joined: Sat 19 Nov, 2011 18:35
Posts: 2126

  Z3 roadster 1.9

Re: Top mounts rattling after swapping out..!

Post by Del » Mon 21 Sep, 2015 09:22

I've heard of unbranded, ebay budget, rear top-mounts failing from new but not those from either the OE manufacturer Lemforder (which can be bought for less without the dual BMW branding) or the Meyle HD ones which I fitted to my car a few years back (along with numerous others on this forum) and they have been trouble-free for me.

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Gazza
Site Admin
Joined: Tue 04 Oct, 2005 21:58
Posts: 9220

  M roadster S54
Location: East London/Essex

Re: Top mounts rattling after swapping out..!

Post by Gazza » Mon 21 Sep, 2015 19:59

This thread has been tidied up to keep the content on topic.
Gazza

"Understeer is when you hit the wall with the front of the car, oversteer is when you hit the wall with the rear of the car. Horsepower is how fast you hit the wall and torque is how far you take the wall with you"

S54 M roadster Image, BMW Z1, BMW M3 CSL, Mustang Fastback

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Mugs
Joined: Wed 07 Aug, 2013 02:26
Posts: 341

  Z3 roadster 1.9

Re: Top mounts rattling after swapping out..!

Post by Mugs » Mon 21 Sep, 2015 20:06

just another thought....... put a washer behind the head of the bottom shock bolts. these can sometimes bottom out in the hole and cause the shock to rattle. this will then reverberate up through the top mounts and make it sound like they are rattling.

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