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Old 03-30-2005, 13:02   #1 (permalink)
kezoe
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Knocking when wet

I have a 1994 300 disco tdi.

When we get rain, it knocks underneath. Normally on braking or
cornering/body roll. It doesn't do it in the dry, only when it rains
for a day or two.

Anybody any ideas? I'm ruling out gearbox drive train as it's affected
by damp conditions.

Incidentally, many of you helped me with a ticking noise last year.
Thanks for that. It turned out that after replacing expensive parts
such as the front pipe, some nerd had put number 4 injector clamp on
upside down when it went in for a replacement cylinder head under
warranty months before. Just in case you hear of this one again.

K
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Old 03-30-2005, 13:02   #2 (permalink)
sylva@despammed.com
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Re: Knocking when wet

On 30 Mar 2005 11:33:37 -0800, kezoe@screaming.net (kezoe) wrote:

>When we get rain, it knocks underneath. Normally on braking or
>cornering/body roll. It doesn't do it in the dry, only when it rains
>for a day or two.


Worn rubber bushes which allow movement in the wet but not when dry?

AJH
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Old 03-30-2005, 13:02   #3 (permalink)
JD
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Re: Knocking when wet

sylva@despammed.com wrote:

> On 30 Mar 2005 11:33:37 -0800, kezoe@screaming.net (kezoe) wrote:
>
>>When we get rain, it knocks underneath. Normally on braking or
>>cornering/body roll. It doesn't do it in the dry, only when it rains
>>for a day or two.

>
> Worn rubber bushes which allow movement in the wet but not when dry?
>
> AJH


Yes, more specifically, one or more of the steel sleeved bushes is just
loose enough to move when it is lubricated by water but not when it is dry.
Most likely the front of the rear radius rod or the panhard rod ends, but
could be any of the other steel sleeved bushes. An early repair will save
wear to the cheek plates that clamp the inner sleeve of the bushes, or in
the case of the front of the rear radius rods, the shoulder on the rod.
JD
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Old 03-30-2005, 13:02   #4 (permalink)
sylva@despammed.com
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Re: Knocking when wet

On Thu, 31 Mar 2005 06:28:18 +1000, JD <jjd@SPAMLESS.com.au> wrote:

>Yes, more specifically, one or more of the steel sleeved bushes is just
>loose enough to move when it is lubricated by water but not when it is dry.
>Most likely the front of the rear radius rod or the panhard rod ends, but
>could be any of the other steel sleeved bushes. An early repair will save
>wear to the cheek plates that clamp the inner sleeve of the bushes, or in
>the case of the front of the rear radius rods, the shoulder on the rod.


I had this with a series III but it was the bush on one of the spring
hangers coming adrift from the steel tube.

If it's slop in the radius rods you often feel it as a power on/off
steering effect if it gets bad.

AJH
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Old 03-31-2005, 11:01   #5 (permalink)
kezoe@screaming.net
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Re: Knocking when wet

Thanks for the advice. Will undertake a thorough investigation of all
bushes this weekend
K

JD wrote:
> sylva@despammed.com wrote:
>
> > On 30 Mar 2005 11:33:37 -0800, kezoe@screaming.net (kezoe) wrote:
> >
> >>When we get rain, it knocks underneath. Normally on braking or
> >>cornering/body roll. It doesn't do it in the dry, only when it

rains
> >>for a day or two.

> >
> > Worn rubber bushes which allow movement in the wet but not when

dry?
> >
> > AJH

>
> Yes, more specifically, one or more of the steel sleeved bushes is

just
> loose enough to move when it is lubricated by water but not when it

is dry.
> Most likely the front of the rear radius rod or the panhard rod ends,

but
> could be any of the other steel sleeved bushes. An early repair will

save
> wear to the cheek plates that clamp the inner sleeve of the bushes,

or in
> the case of the front of the rear radius rods, the shoulder on the

rod.
> JD


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