Knocking/Rattle from the rear? - Suspension Forum - Peugeot 306 GTi-6 & Rallye Owners Club

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Subject: Knocking/Rattle from the rear?

JayKay

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Location: Poulton-le-fylde

Registered: 11 Aug 2012

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Post #1

This is driving me insane! There's a knock and rattle coming from the back end whilst going over even the smallest of bumps, i've had it on and off the four poster more times than i dont know what and i cant find it! I've tightened every nut, bolt and screw i can see and it has aluminium subframe mounts(don't know if this is standard). I'm at a dead end as i cant understand how anything can be rattling, any suggestions?

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Posted 18th Aug 2012 at 21:47

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welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

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Post #2

fit rubber mounts, job done.

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Posted 18th Aug 2012 at 23:08

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coskev

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Location: Oswestry

Registered: 01 Nov 2009

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Post #3

Solid mounts wont make it rattle/knock.

Shocks and beam bearings ok?

Exhaust in good condition?

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Posted 19th Aug 2012 at 09:27

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matt evans

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Post #4

My moneys on the bushes in the lower shock mount, they can click/knock when under load if worn.

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Posted 19th Aug 2012 at 09:34

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swiftyboi006

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Post #5

Rattle sounds more like exhaust, heatshield, spare wheel cage. Mounts tend to nock but not rattle

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Posted 19th Aug 2012 at 09:45

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jonnie205

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Post #6

yes solid mounts will make it rattle usually, check rear caliper bolts too

Posted 19th Aug 2012 at 10:47

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greenbelt

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Post #7

Check your rear brake disc protectors. If they are corroded they can make it sound as if your car is about to disintegrate Wink

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Posted 19th Aug 2012 at 12:36

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coskev

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Post #8

jonnie205 wrote:

yes solid mounts will make it rattle usually, check rear caliper bolts too

solid mounts might make rattles and bangs louder,but they cannot rattle or bang themselves as they are bolted to the car/beam tightly Dunno

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Posted 19th Aug 2012 at 19:23

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30ASTOR6

Regular

Location: shrewsbury

Registered: 19 Mar 2012

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Post #9

matt evans wrote:

My moneys on the bushes in the lower shock mount, they can click/knock when under load if worn.

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Posted 19th Aug 2012 at 19:35

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jonnie205

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Post #10

coskev wrote:

jonnie205 wrote:

yes solid mounts will make it rattle usually, check rear caliper bolts too

solid mounts might make rattles and bangs louder,but they cannot rattle or bang themselves as they are bolted to the car/beam tightly Dunno

well they do, needle bearings to arm shafts are metal on metal, the play between the bearings and shafts can vibrate and rattle, same on the 206 beams, as soon as you go solid they rattle, some worse than others. Also any play in arb bushes, shocks, calipers all transmit througn the solid mounts into the shell

Posted 19th Aug 2012 at 19:49

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coskev

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Location: Oswestry

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Post #11

jonnie205 wrote:

coskev wrote:

jonnie205 wrote:

yes solid mounts will make it rattle usually, check rear caliper bolts too

solid mounts might make rattles and bangs louder,but they cannot rattle or bang themselves as they are bolted to the car/beam tightly Dunno

well mine don't Thumbs up

perhaps on a old f**ked beam you would hear it more,but thats not the mounts making the noise is it? Roll eyes

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Posted 19th Aug 2012 at 20:56

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jonnie205

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Post #12

the mounts dont make the noise but they transfer any noises into shell LOL

Posted 19th Aug 2012 at 21:21

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JayKay

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Location: Poulton-le-fylde

Registered: 11 Aug 2012

Posts: 87

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Post #13

Cheers guys, I've looked at almost all of what everyone's saying. I have no spare wheel carrier or bolt/hook so that's ruled out, full s/s exhaust and it doesn't touch anywhere(I spent hours making sure of this as it was knocking under deceleration when I got the car), There's a little rattle from the rear pads but it isn't that I can hear.... May do the shock bushes for the fun of it Smile

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Posted 20th Aug 2012 at 07:30

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coskev

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Post #14

Might be worth checking in the holes through the boot floor/box section where beam mounts are secured to car,make sure the washers are fitted Wink

Could be loose rattling around in the box section Dunno

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Posted 20th Aug 2012 at 10:44

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stan_306gti6 Forum Admin

Location: Kent

Registered: 18 Jan 2004

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Post #15

Solid rear mounts do not create a rattle from the rear of the car. They do however make any rattle that's present sound louder as there is no longer any rubber damping to absorb the noise. Yes

My guess is either as suggested shock bushes worn or beam bearings themselves worn. Wink

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Posted 20th Aug 2012 at 16:15

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daveyboy

aka Jim Davey

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Registered: 01 Oct 2007

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Post #16

If it's under deceleration it could be engine/chassis mount related.

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Posted 20th Aug 2012 at 16:21

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JayKay

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Location: Poulton-le-fylde

Registered: 11 Aug 2012

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Post #17

Nah it's not under acceleration or deceleration, in any case I have just fitted group N engine and gearbox mounts, and I've tightened every nut and bolt I can reach, what does the "passive" rear steering? Is the beam bearings a problem?

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Posted 20th Aug 2012 at 20:22

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greenbelt

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Post #18

greenbelt wrote:

Check your rear brake disc protectors. If they are corroded they can make it sound as if your car is about to disintegrate Wink

Seriously mate I would check the disc protectors. Takes less than a minute to see if they are the cause Yes

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Posted 20th Aug 2012 at 20:56

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coskev

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Post #19

You haven't got passive rear steering,due to having solid mounts Thumbs up

the orig mounts give the passive rear steer.

Beam bearings are a problem now as the cars are old,is there any camber on either of the rear wheels?

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Posted 20th Aug 2012 at 22:09

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JayKay

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Location: Poulton-le-fylde

Registered: 11 Aug 2012

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Post #20

, That's strange as I thought I could feel lateral movement at the rear under heavy cornering....

There doesn't seem to be any camber on the rear, the beam bearings must be at fault, although I will check the disc protectors tomorrow, can the beam bearings being worn become dangerous... I.e. Is a unit going to fly off eventually? Typically when half way round a tight left-hander on the limit on a narrow country road in the small hours? Big grin

Anyone have an opinion on which mounts are best, original or solid? I'd quite like a bit of rear steer....

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Posted 20th Aug 2012 at 23:39

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stan_306gti6 Forum Admin

Location: Kent

Registered: 18 Jan 2004

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Post #21

It's all down to personal preference really when it comes to the rear mounts.

Some prefer standard ones with the passive rear steer whilst others prefer the solid. I personally would never go back to standard ones, for me the solids make the car so predictable and handle much better. Each to their own really.

As for worn beam bearings being dangerous, the fact that you haven't got any noticeable camber on the rear wheels suggests to me they're not critical as yet to be changed, but even so they don't really cause massive failures like bits flying off. Smile

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Posted 21st Aug 2012 at 06:27

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JayKay

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Location: Poulton-le-fylde

Registered: 11 Aug 2012

Posts: 87

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Post #22

Cheers Stan, I'm going to york on Monday and I suspect my clutch won't last the day at the strip so it will be straight back and on the four poster for a week or so, I'm thinking organic clutch, lightened flywheel, air con removed, one of those fandangly alloy lower pulleys and a general good going over! So I'll check all te back end out then and figure out what I want to do with the rear mounts!

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Posted 21st Aug 2012 at 10:16

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coskev

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Post #23

Agree with Stan,would never go back to standard beam mounts after solids Thumbs up

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Posted 21st Aug 2012 at 10:38

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eliotrw

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Post #24

from what I understand from peoples comments and my understanding of the effect they have, Its seems to me that having them is one of those things that you need to have modifications else where in the suspension to get the best out of them?

I.e Stiffing the back with a thicker arb/stiffer shocks?

i may be wrong though

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Posted 21st Aug 2012 at 10:53

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JayKay

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Location: Poulton-le-fylde

Registered: 11 Aug 2012

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Post #25

I'm not sure, I'm used to big RWD cars so I'm not adverse to a "loosening" of the rear, in fact; I quite enjoy it! I know a lot of people don't like rear unpradictability though, I suppose I'd just have to try 'em out and see what happens! I'm not doing them until I find out what all this noise is though, disc protectors are fine but there is a little camber at the rear; about two or three degrees I would estimate....

I take it that's not supposed to be? How much for beam bearings, which ones and what are they like to fit anyone?
Cheers for all the help and advice fellas Thumbs up

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Posted 21st Aug 2012 at 18:02

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