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Author Topic: Knocking n/s/f  (Read 6120 times)

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Migv6 le Frog Fan

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Knocking n/s/f
« on: 19 February 2017, 20:47:11 »

Quite a severe knocking when going over bumps and even when applying the brakes, from the n/s/f. I fitted new Meyle droplinks today but that hasn't cured it.
I observed there was noticeable play in the wheel bearing, question is, would that be a likely cause of these symptoms. I cant see it myself, but I may be wrong.  :-\
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Re: Knocking n/s/f
« Reply #1 on: 20 February 2017, 08:25:20 »

Following as iv same but only when turn or a little bump
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Re: Knocking n/s/f
« Reply #2 on: 20 February 2017, 09:44:43 »

The usual cause is droplinks needing replacing which is why I did that first. In my case it hasn't worked though.
I shall probably replace the wheel bearing (hub) soon anyway, and if it isn't that, then dampers and top mounts are about the only thing left to change.
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Nick W

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Re: Knocking n/s/f
« Reply #3 on: 20 February 2017, 10:13:53 »

You can determine if it's the wheel bearing by jacking the car and inspecting. It's unlikely to be the problem,as you would have other symptoms. Changing them just for the sake of it is daft.


Which leaves a worn out shock/top mount/bearing/rusty strut tower.


Knackered shock is where I would look next.
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Re: Knocking n/s/f
« Reply #4 on: 20 February 2017, 11:47:49 »

You can determine if it's the wheel bearing by jacking the car and inspecting. It's unlikely to be the problem,as you would have other symptoms. Changing them just for the sake of it is daft.


Which leaves a worn out shock/top mount/bearing/rusty strut tower.


Knackered shock is where I would look next.

If it was WB then you would hear a grumbleing noise would you not
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Re: Knocking n/s/f
« Reply #5 on: 20 February 2017, 12:33:23 »

You can determine if it's the wheel bearing by jacking the car and inspecting. It's unlikely to be the problem,as you would have other symptoms. Changing them just for the sake of it is daft.


Which leaves a worn out shock/top mount/bearing/rusty strut tower.


Knackered shock is where I would look next.

Definitely noticeable bearing play when pulling / pushing on top & bottom of the disc.  :y
I'm also suspecting shock. Being an elite,means its quite "floaty" anyway, so maybe not as easy to diagnose as an MV6 say.
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Re: Knocking n/s/f
« Reply #6 on: 20 February 2017, 13:54:26 »

Play at 12 and 6 isn't always a bearing. If you do that and feel the top mount I bet you'll find it's that that's causing the knocking and the play. Check the nuts tight and if it is replace top mount
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Re: Knocking n/s/f
« Reply #7 on: 20 February 2017, 14:50:05 »

Check the rear vertical bush on the suspension arm.this can detach itself from its rubber surround
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Re: Knocking n/s/f
« Reply #8 on: 20 February 2017, 17:45:49 »

Its almost brand new, genuine GM. ;)
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Re: Knocking n/s/f
« Reply #9 on: 20 February 2017, 18:42:36 »

Worth a wiggle but we can probably eliminate that then !
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Re: Knocking n/s/f
« Reply #10 on: 01 March 2017, 11:31:20 »

Removed the strut this morning to see if there was anything visbly obvious, which there wasn't. Problem is I don't have any spring compressors to strip it any further, so cant ascertain if the top mount bearing is knackered or not.  :-[
Should be able to borrow some compressors soon, so can hopefully carry on with diagnosis shortly.
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Re: Knocking n/s/f
« Reply #11 on: 01 March 2017, 13:09:40 »

Iv a pair u can borrow :y
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Re: Knocking n/s/f
« Reply #12 on: 01 March 2017, 13:37:43 »

Very kind offer thanks, but Ive arranged to borrow some from a workmate.  :y
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Re: Knocking n/s/f
« Reply #13 on: 01 March 2017, 15:30:46 »

Very kind offer thanks, but Ive arranged to borrow some from a workmate.  :y

Ok buddy be interested to know what the outcome is as my steering is a little wavey n I've a knocking coming from ns also
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Re: Knocking n/s/f
« Reply #14 on: 01 March 2017, 15:45:24 »

Very kind offer thanks, but Ive arranged to borrow some from a workmate.  :y

Ok buddy be interested to know what the outcome is as my steering is a little wavey n I've a knocking coming from ns also
99/100 droplinks knocking and worn bushes... bet yours is between 80 and 120k miles old ;)
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