Knock knock

**Salt grinder** · 22nd February 2019, 04:32 PM

We've just been back from Tassie a week after 3 weeks touring and camping in the D4
I had planned a bit of remote tracks work in the big forrests but the fires changed our minds.

However an issue raised it's ugly head and I'll have to start searching the cause.
This noise only occurs on the dirt tracks, corrugations or rough black holes.

Best described as a knock similar to that like a worn shocky. Solid knock. bag bang bang only - only the rough. I wonder if anyone notes this as a common problem.
No sound at all on the smooth and steering tight and normal . . no slack.
I have not had a moment to look yet but thought maybe someone with experience can narrow the search down for me.

I can't do anything for a couple of weeks as I just had a holiday hernia stiched up today. Got to just sit on my A

**ramblingboy42** · 22nd February 2019, 05:09 PM

I had similar in my D2.

first thing I found was lower front damper bushes were split.

second thing I found was engine mounts were suspect

changed all , peace and smoothness again

**letherm** · 22nd February 2019, 05:18 PM

Who's there?

Sorry, couldn't resist.

Martin

**jonesy63** · 22nd February 2019, 06:04 PM

It's probably the lower control arm hydro-bushes. They wear out - more so if you do a lot of off-road work.

**twr7cx** · 22nd February 2019, 09:33 PM

Originally Posted by jonesy63

It's probably the lower control arm hydro-bushes. They wear out - more so if you do a lot of off-road work.

Is there a test for this? i.e. do the hydro bushes visually look damaged when they've failed such as rips/tears/cracks or traces of leaking 'hydro' fluid? Or is it just a pry bar to test for movement/play in them?

**loanrangie** · 22nd February 2019, 09:50 PM

Originally Posted by twr7cx

Is there a test for this? i.e. do the hydro bushes visually look damaged when they've failed such as rips/tears/cracks or traces of leaking 'hydro' fluid? Or is it just a pry bar to test for movement/play in them?

They split and the fluid leaks out, a big screwdriver or tyre lever between the arm and chassis mount will confirm.

**cjc_td5** · 22nd February 2019, 09:52 PM

Originally Posted by twr7cx

Is there a test for this? i.e. do the hydro bushes visually look damaged when they've failed such as rips/tears/cracks or traces of leaking 'hydro' fluid? Or is it just a pry bar to test for movement/play in them?

Mine just sprung an oil leak. There was no great increase in play using a pry bar, just the fluid leak and a lot of clunking. (I was out half way along the Gunbarrell Hwy at the time, grrr).

**Redback** · 26th February 2019, 09:30 AM

Lower control arms as said above, replace both sides and it's cheaper to replace the whole arm than replace the bushes.

**Pippin** · 26th February 2019, 09:55 AM

Originally Posted by Redback

Lower control arms as said above, replace both sides and it's cheaper to replace the whole arm than replace the bushes.

It is! I recently bought new Meyle HD bushes from Advanced Factors in the UK, after much difficulty finding someone to fit them and the cost I bit the bullet and bought the complete arms from AF. The ride is great with the Meyle HD bushes, so if any one wants to buy a complete set of bushes for both sides and has the equipment to press them send me a pm. Nick

**Redback** · 26th February 2019, 10:56 AM

Originally Posted by Pippin

It is! I recently bought new Meyle HD bushes from Advanced Factors in the UK, after much difficulty finding someone to fit them and the cost I bit the bullet and bought the complete arms from AF. The ride is great with the Meyle HD bushes, so if any one wants to buy a complete set of bushes for both sides and has the equipment to press them send me a pm. Nick

Yes that's the main issue, finding someone willing to do it, I did for my last set but the price difference was not much and he said afterwards he would be reluctant to do them again.

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