Banging noise when going over bumps

Pathfinder100 · 2022-03-09 21:56:43

I have a noise that sounds like the bushings have gone on the rear, nearside wheel (back left). I think it's bushings and sounds the same as problems I've had on cars with a similar issue. If not, it's probably the shock or springs. I had a quick look under last weekend and the springs, while looking rusty and generally crap, don't appear to be broken. The shocks I can't gauge, but the universal test of pushing down on the back and seeing if the van bounces back up is ok, it does come back up.

Does anyone have any other ideas. My current thoughts are to replace the shocks and springs.

If I could find what was making the banging noise it would be helpful. But for now I think its coming from just in front of the wheel, which I believe is where the shock is mounted.

I originally thought it was the exhaust, but I checked all the rubber mounts and they are fine.

kenbw2 · 2022-03-10 02:18:54

I was told when I had this it was the rear axle bushes

Pathfinder100 · 2022-03-10 14:12:43

I had a look yesterday and according to this diagram, this is (I think) what i need.

I am guessing that you jack the back end up, put it on axle stands, remove the wheels and then remove the bolts, replace the bushes and then put everything back together. Or is it more in-depth than that?

kenbw2 · 2022-03-10 15:29:35

I have no personal experience, but I was told that it's an absolute arse. My understanding is that it's in principle fairly straightforward, but the bushes are ridiculously tight and hard to fit. I'd get the opinion of someone more knowledegable though

Pathfinder100 · 2022-03-10 20:44:51

Ahh, silicon grease, clamp and knocking stick territory.

I admittedly have never done them before. Most jobs on a car or van seem to need a hammer nowadays.

CaptainFlint · 2022-03-10 22:08:59

I did the rear bushes on my old 2001 dispatch, it's not that hard a job!

doing one side at a time is how I did it, no need to remove the rear axle that way.

Jack back of the van up
Remove the rear wheel
Stick something under the axle (a trolley jack is perfect)
Remove shock absorber
Watch the rear spring fall out
Undo the bush nut/bolt wossname
Pull out the rubber part of the bush (it'll be falling to bits)
Using a hacksaw cut out the old bush metal sleeve (might need a screwdriver to pry it out once you've cut it)
Give everything a clean
Using a threaded bar with some spacers and nuts, install the new bush
Put everything back together and do the other side.

I did buy a tool to install the new bush but it's essentially a threaded bar with nuts and spacers.

CaptainFlint · 2022-03-10 22:13:25

Also my way of telling the rear bushes had perished was the noise coming from the back of the van when hitting a pot hole.

It sounds nearly identical to twanging a ruler on the edge of a desk

Pathfinder100 · 2022-03-11 00:24:20

Is it possible to inspect the bush without removing everything. Mine doesn't give a twanging noise. It's basically a bang on every bump, hole, or uneven section of the road. I might do the shocks as well at the same time. It has to be one of them. This has been going on for a couple of weeks, so maybe the bush has completely disintegrated.

Will try and get a good look at it tomorrow. if it is that, then I will order a set of new bushes and maybe shocks.

CaptainFlint · 2022-03-11 11:29:55

I'm not sure if you can inspect the bushes without removing stuff.

Suppose you could just jack the van up, take the wheel off and the bottom of the shock - it could give you enough free play to see if there's any wiggle room in the bush.

Just noticed you're in south yorkshire too, if you want you can have the bush tool I used to install bushes on my old van - it's just sat in the garage doing not a lot!

320man · 2023-01-16 11:59:37

Just done this and a wee update
Jack up van on one side and put an axle stand way inside under the chassis leg. Keeps work area clear.
Put your trolley jack under the coil spring but don’t jack up yet
Remove nut from bolt holding bush in place , this is a dog to get off. Coat with WD40 overnight and heat till it glows with a plumbers torch worked for me.
Jack up under coil spring to take load off bolt and remove.
Lower jack and the bush is easy to work on. You don’t need to remove any other bolts , shocker or coil spring.
I used an electric reciprocating hack saw to make a cut through the outer metal sheath . Couple taps with small chisel and it was out .
Coat new bush and housing liberally with copper grease (I left bush in freezer overnight )
Seat bush and tap in to place with a large socket (35mm)
Jack back up put bolt in . Done
Simple to do in around an hour

Last edited by 320man (2023-01-16 12:01:53)

kenbw2 · 2023-01-16 12:48:34

Oh nice, I've been told they're an absolute bitch to replace without the right tools. But sounds like with a bit of planning you nailed it

AlvyLad · 2023-01-16 19:37:29

https://dispatchexpertscudo.org.uk/foru … hp?id=1667
Forgotten to post back the jobbie that was done by a monkey wrenches local to me.
No joke two of them where hammering with sledge hammers and cold chisels for an hour in turns to get it out and where using special threaded bushing kit with extensions to get a new one in.
In short unless you are well clued up and we'll geared up it absolutely is pig of a job... Hence I didn't even try to do it own self (or that is my excuse) ;P

Pathfinder100 · 2023-01-20 19:59:46

It is really high on my list at the minute. But I'm damned if I will pay someone to do it. I could afford it, but if i was in the arse end of Mongolia or something and had to do it, well it's better to have that type of knowledge. Also I have to take the back wheels off anyway to do the brake shoes.

I have a hacksaw, I have a hammer, chisel, screwdriver, lots of copper grease and a selection of big sockets that can be used to hammer the new one in. I just hope it's the right parts. Mine cost considerably less than yours did. I got these ones. Cost less than £20. If they last a year or two I will be happy.

https://www.ebay.com/itm/266056161953

JohnDragonMan · 2023-01-20 23:26:05

use a big drill to "drill" out as much rubber from the old bush as you can, then thread the hacksaw blade through the newly drilled hole and connect it up upside down in the handle, then saw through the outer race of the bush. once you do that and get through the outer race it will come out real easy. to get the new one in, i used a bit of threded bar, 2 nuts, 2 thick washers, and 2 sockets. added some copper grease and they wound right in place.

for any real space you will have to disconnect your brake hose flexies on the rear axle.. thing is though if they are as old as the van, i'd get them changed anyway. chances are the brake fluid is over 10 years old too.

am i the only one that uses a vacuum pump and catch tank to bleed brakes or am i just weird? does work well..

Pathfinder100 · 2023-01-21 07:41:20

Brake fluid is on my 'to do' list of jobs. Was planning on using a DIY one way valve setup using a bottle, pipe and some duct tape. I don't know how long the fluid has been in, but since I have weird brakes that work, but don't feel good, I might as well do it too. Technically I have an ABS issue too, like a bouncing on the brakes. I watched a guy on YT trying to find out the cause and it was holes/notches in the ABS sensor disc. It's not in budget to replace them at the minute. So many other things are substandard that are higher on the list.

TBH i would prefer to not remove any brake line hoses. I hate brakes at the best of times, but when you get air in the hoses, that's when I really hate them. tongue it's bad enough doing the bike brakes.

scotchjoe · 2023-01-21 09:07:00

JohnDragonMan wrote:

use a big drill to "drill" out as much rubber from the old bush as you can, then thread the hacksaw blade through the newly drilled hole and connect it up upside down in the handle, then saw through the outer race of the bush. once you do that and get through the outer race it will come out real easy. to get the new one in, i used a bit of threded bar, 2 nuts, 2 thick washers, and 2 sockets. added some copper grease and they wound right in place.
for any real space you will have to disconnect your brake hose flexies on the rear axle.. thing is though if they are as old as the van, i'd get them changed anyway. chances are the brake fluid is over 10 years old too.
am i the only one that uses a vacuum pump and catch tank to bleed brakes or am i just weird? does work well..

I use a hand vacuum pump to bleed brakes as well. Mainly used on motorbikes with linked brake systems, but makes bleeding brakes on any vehicle a one man job.

JohnDragonMan · 2023-01-24 00:07:56

heh i used the same vacuum pump i used when i evacuated the AC system on the van. my theory being that it cant have air in it, if all the air is gone. i made it so any ir would bubble up through a jar of brake fluid but when i opened the valve ont he pump to atmosphere it sucked all of the brake fluid back into the break system. it worked amazing.

i fully agree though, if you dont feel good with brakes get a pro to do them. i lost a close family member to bad brakes on a bike that was not even old enough to have its first MOT due to someone inexperienced working on them.. its why i always strip down brakes on any vehicle i buy and replace most key parts. funny the parts i never really replace is pads and discs as well its false economy if they still have life in them. most hydraulic stuff however i change just for my own.. hmm.. insecurity reasons. i sometimes even modify brakes on old stuff like my old panda to have a bit of redundancy should one corner fail.

anyway, back to bushes and suspension? for saying i am a mod on another forum you would thing i would be all up and strict with going off topic haha

Stu-D · 2023-01-26 23:51:51

On my van it was the exhaust knocking the chassis originally, then when I cut that short/back box deleted it, as I had not welded on a downturn to the exhaust exit I started getting another knocking from the rear as the exhaust had cooked bush for the panhard bar, but if memory serves you have fixed that already in another post eh? If it is the rear axle bushes you would feel the back end skipping about when cornering and hitting bumps while hearing the clunking, most likely?

Stu-D · 2023-01-26 23:54:38

JohnDragonMan wrote:

am i the only one that uses a vacuum pump and catch tank to bleed brakes or am i just weird? does work well..

I used to but I find a gunson eazeebleed on a tyre with about 10psi in it is even quicker for bleeding things, especially like a MK4 golf when trying to bleed full system with abs.

Pathfinder100 · 2023-02-01 14:53:56

Stu-D wrote:

On my van it was the exhaust knocking the chassis originally, then when I cut that short/back box deleted it, as I had not welded on a downturn to the exhaust exit I started getting another knocking from the rear as the exhaust had cooked bush for the panhard bar, but if memory serves you have fixed that already in another post eh? If it is the rear axle bushes you would feel the back end skipping about when cornering and hitting bumps while hearing the clunking, most likely?

Yeah it skips and bangs. I had a go at it the other day, but will need a bit more time. if it's dry tomorrow I will probably have another go then.

It's just one of too many jobs, that need doing.

Pathfinder100 · 2023-02-22 16:09:20

So I had a go and then realised I would have to remove the exhaust to get at the offside bolt. I don't have good experiences from messing with exhausts. But saying that, the brakes are also knackered but working. What you (John) said about replacing the brake fluid is spot on. I had the hubs off on the weekend and the adjusters are seized up and I need new pistons as both are rusty and one is leaking. I sprayed everything down with WD-40 (except brake shoes) and tried to clean up as much crud as possible. Everything else isn't bad.

Anyway it went in for MOT and failed on offside ball joint. Nearside got done last year, so not entirely surprised. smile that's happening on Monday and then I need to try and get on with the bushes.

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#1 2022-03-09 21:56:43

Banging noise when going over bumps

#2 2022-03-10 02:18:54

Re: Banging noise when going over bumps

#3 2022-03-10 14:12:43

Re: Banging noise when going over bumps

#4 2022-03-10 15:29:35

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#5 2022-03-10 20:44:51

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#6 2022-03-10 22:08:59

Re: Banging noise when going over bumps

#7 2022-03-10 22:13:25

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#8 2022-03-11 00:24:20

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#9 2022-03-11 11:29:55

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#10 2023-01-16 11:59:37

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#11 2023-01-16 12:48:34

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#12 2023-01-16 19:37:29

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#13 2023-01-20 19:59:46

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#14 2023-01-20 23:26:05

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#15 2023-01-21 07:41:20

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#16 2023-01-21 09:07:00

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#17 2023-01-24 00:07:56

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#18 2023-01-26 23:51:51

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#19 2023-01-26 23:54:38

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#20 2023-02-01 14:53:56

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#21 2023-02-22 16:09:20

Re: Banging noise when going over bumps

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