D2 SLS Airbags

[Brad110]

What size are the airlines? 3, 4 or 5mm 1/4"?

Do the lines self seal if I remove them from the manifold near the pump?

Do the bags equalise when the car is not running, turned off?

What thread is the junction into the manifold? And into the airbags?

All for now, just trying to diagnose possible problem and make emergency inflation lines should (or when) a failure occurs.

When did the bags change from gland fittings to push in as per Diff locks.?

[Pedro_The_Swift]

4mm,

self seal?!?, and take away a chance of a bag deflation?:p

aparently, but only for a very short time,, mines never done it, only ever farts to let air out.

I'm only guessing but being a wabco probably metric something,

I've carried a DIY kit for, um, 8 years now,, but naturely after replacing bags in both Disco's I've never needed it:angel:

[bsperka]

4mm.
Just a normal connection at the valve block. Undo the connection air comes out.
Thread size - I don't know.
Self leveling suspension so bags don't equalise unless weight is same on both sides and level ground etc. There's a reason there is a computer controlling the air pressures.
Factory are screw in; aftermarket can either be screw in or push in.
Have an emergency kit of 2x 1 metre 4mm lines, 2x Shrader valves and pipe adaptors (and brass connectors if oem). Keep maintenance up and should not need to use them.

[joel0407]

http://www.aulro.com/afvb/discovery-2/181009-my-sls-emergency-spares-kit.html

4mm.

To remove the tube, without pressure in the system, push the hose and the collar into the fitting at the same time then remove the tube while holding the collar in. Hope that makes sense.

You can buy all sorts of 4mm fittings, straight through joiners, T peices, Y peices, up sizers, down sizers. Use your imaginaion.

Happy days.

[joel0407]

The best way is to pop the cover off the compressor and have a look. You'll see 2 valves on the bottom, left. These are the left and right valves. The compressor turns on to go up and the exhaust opens to go down. The left and/or right valves open or close depending on which (or both) side needs to up or down. I haven't completely worked it out yet but I think I read that it if one side is low and the other high, it will inflate the low side before exhausting the high side and I think from memory, it won't adjust if they are more than 100mm different in heights.

"Lewy" has mentioned he has a LED light in the vehicle so he knows when the system is inflating or exhausting. I can't hear mine inflate with the engine running until my air tank is low enough for the compressor to turn on. I can hear it exhaust but only when stopped and a window down.

My next mod will be a relay in my exhaust valve to prevent it exhausting under brakes as the rear rises and weight comes off the rear in this situation. My problem is the system adjusts too often in town for my liking. Every stop it's letting air out and then adding straight away after I take off.

Happy Days.

[jadan]

Hi, is it common for the exhaust valves to be faulty? My drivers side has gone down 3 times in 2 weeks. about 4-5 days apart. seems to happen with a bit of a load and when I am loading the vehicle. has only happened with car not running. no obvious leaks once reinflated.... any ideas... cheers

[joel0407]

I should mention. I ran around for a couple of months on the emergency 4mm lines with the shrader valves until I got my compressor sorted.

During this time I found the air bags to be more sensative to weight than springs. By this I mean a little weight made a big differance to height. I never measured it but seemed like it would drop 2 inches from just filling up with fuel from empty. When I first put them in I got it on level ground and measured everything, pumped them up and got it all nice and level but within a couple of weeks I found I was adjusting it every few days because I'd used some fuel and think "gee thats high" measure it and lower and bit. Then I'd have the kids in the back and thing "gee that low" and add a bit.

I guess air bags and more progressive than springs as in, if you add 100kg they drop 2 inches but if you add 100kg more they'll only drop another 1/2 inch. They are just really soft around centre and I guess that's what makes there ride like it does and that would make it easier for a shock to control bounce as the force from the air bag (air spring) reduces as it reaches centre.

Happy Days

[joel0407]

Hi, is it common for the exhaust valves to be faulty? My drivers side has gone down 3 times in 2 weeks. about 4-5 days apart. seems to happen with a bit of a load and when I am loading the vehicle. has only happened with car not running. no obvious leaks once reinflated.... any ideas... cheers


I have not had any experience with a failing or old sytem as I rebuilt mine since the previous owner had fited coils.

I have read that they can leak in the fold so you can check the bags and think they are not leaking but hit the "off road mode" button on the dash and once the bags expand and unroll you might find a leak under the roll.

I don't think it would be common for the exhaust valve to leak as there is 2 valves between your bags and the atmosphere. The first of the 2 vales one each on the left and right bags and then the exhaust valve itself.

The left and right valve block has 3 connections on top and it is completely seperate to the pump/exhaust. The centre connection goes to the pump/exhaust, the other 2 go to the left and right bags.

There is also a pressure released valve on the side of the compressor. I'll try and find the pic in one of my past threads. I hacked up my compressor just to see how it all worked and posted up some pics for those who might be interested.

Happy Days

[joel0407]

Found it.

Page 1 shows the SLS sytem muffler cut in half. Thats the plastic cylinder thats mounted on the chassis rail back from the compressor. Turns out it's pretty much an empty plactic can.

Page 2 has the pressure releif valve opened. It has an allen key slot in the centre and pops out in a bayonet style fitting. Just be cautious the spring is a little hard. I didn't know what it was at the time of pulling it apart but other suggested and it makes sense. It seems like it could be servicable in the way its fitted. You could check that for a leak.

Happy Days.

http://www.aulro.com/afvb/discovery-2/192364-d2-sls-pump-alternative-2.html

[bsperka]

Hi, is it common for the exhaust valves to be faulty? My drivers side has gone down 3 times in 2 weeks. about 4-5 days apart. seems to happen with a bit of a load and when I am loading the vehicle. has only happened with car not running. no obvious leaks once reinflated.... any ideas... cheers

You can try extended mode, but it doesn't work to determine if there is a leak every time. Sometimes the fabric starts to fail, rather than a hole. T To really figure it out, take the airbag out and pump up with only a bit of pressure in a bucket of water.

[joel0407]

You can try extended mode, but it doesn't work to determine if there is a leak every time. Sometimes the fabric starts to fail, rather than a hole. T To really figure it out, take the airbag out and pump up with only a bit of pressure in a bucket of water.

Is it hard to get them to roll back over the base once you unroll them? Mine came rolled over the base from new and it looked pretty tight. I installed them rolled over and when the vehicle lowers it just goes back over the base.

Happy Days.

[Clarkey]

soapy water in a spray bottle is ideal for finding leaks in bags, lines and fittings. Push in fittings are notorious for getting dirt in them making them hard to remove, personal preference is brass screw type fittings. I work on Kenworths, 8 airbags miles of airline and fittings, a disco is easy.