SLS Bag/Compressor Emergency Fix

**JayBee75** · 5th July 2010, 12:47 PM

Hi Guys,

Have spent a lot of time searching the forums and whilst I have learnt a lot I am still seeking the answer to the following questions for a quick emergency fix on the SLS system.

SLS Bags - can be manually inflated from an external air source. Some of the guys have put together attachments with air line that can be connected directly to the bag's. Does anyone have the list of parts I need to make up the the line and brass attachments, as I don't want to particullary want to pay $80+, for something that costs up to $20. I did find one thread with pics and all, however cannot re find it now! Once the bag is manually inflated is the line left in? how does the bag continue to hold it's air?

With the new internal collar attachments on top of the dunlop bags, how do you then pull out the main line from the top of the bag to then put in your manual line?

In relation to the compressor, in the event of failure, or manually inflating the bags, how do you "switch it off" so it does not keep trying to inflate or burn itself out if the line has been removed from the top of the bag?

Thanks
JB

**Scouse** · 5th July 2010, 01:14 PM

Originally Posted by JayBee75

I did find one thread with pics and all, however cannot re find it now!

This one?

http://www.aulro.com/afvb/projects-t...ation-kit.html

A fellow forum member made the kit so your money will go to a good cause.

**JayBee75** · 5th July 2010, 01:34 PM

Originally Posted by Scouse

This one?

http://www.aulro.com/afvb/projects-t...ation-kit.html

A fellow forum member made the kit so your money will go to a good cause.

Thanks Scouse, happy to support the foum and members, do you know if I just contact Discowhite directly?

I am still interested in understanding how the bags then hold the air if the compressor fails? What stops the compressor from trying to keep pumping air, how do I switch it off? Again if the Bags fail, how do I stop the compressor from trying to inflate.

For me this is just having a back up plan or preparing in case, rather than waiting until something happens. my bas are 9 years old, and touch wood (taps head) I will not have any issues.

Thanks
JB.

**Scouse** · 5th July 2010, 01:42 PM

It's a Hard Range kit so contact Paul (PaulP38), Andy (AndrewE) or go through the Hard Range site (probably easiest).

Disco II - SLS Emergency Bypass Kit (COMING) | Hard Range Australia

**tassied2** · 5th July 2010, 04:48 PM

I put coils in mine and pulled the pump fuse .

**Pedro_The_Swift** · 5th July 2010, 04:53 PM

how hard can it be?
two 4mm push-in joiners
two schrader valves,
(all available at Pirtek etc,)

some form of compressed air,,

all this and more in the good oil,,,

**discowhite** · 5th July 2010, 06:01 PM

Originally Posted by Pedro_The_Swift

how hard can it be?
two 4mm push-in joiners
two schrader valves,
(all available at Pirtek etc,)

some form of compressed air,,

all this and more in the good oil,,,

your sig line is required here.
3 bolt vs 4 bolt steering box questions

cheers phil

**JayBee75** · 6th July 2010, 08:09 AM

Originally Posted by Pedro_The_Swift

how hard can it be?
two 4mm push-in joiners
two schrader valves,
(all available at Pirtek etc,)

some form of compressed air,,

all this and more in the good oil,,,

Apologies I thought the forum was used to ask questions when unsure. Unfortuantely not all of use carry an expertise in these respective areas.

I have tralled through the Good Oil, and read everything on the bags and EAS, and any other posts I could find. However no where does it state what my question pertained to.

- What happens to the compressor if you manually inflate the bags, particularly if it is letting air out as it has failed, or continues to pump due to it's failure.

- When manally inflating with the line that you refer to, once inflated do you leave the line in the top of the bag with the attachment you have made up, otherwise it just deflates again?

- How do I match the attachment to the attachment at the top of the OEM bag. (schrader valves?) I assume are the ones you are talking about.

Thankyou
JB

**discowhite** · 6th July 2010, 01:29 PM

Originally Posted by JayBee75

Apologies I thought the forum was used to ask questions when unsure. Unfortuantely not all of use carry an expertise in these respective areas.

I have tralled through the Good Oil, and read everything on the bags and EAS, and any other posts I could find. However no where does it state what my question pertained to.

- What happens to the compressor if you manually inflate the bags, particularly if it is letting air out as it has failed, or continues to pump due to it's failure. if the comp fails then you bags will only go down if a bag has a leak, or the exhaust valve fails.

- When manally inflating with the line that you refer to, once inflated do you leave the line in the top of the bag with the attachment you have made up, otherwise it just deflates again? its too hard to get to the top of the air bag, so the fitting would go somewhere easier to get to, you could put the shrader valves in the comp box, the shrader valves will stop the bags deflating, if they are placed in the air line to each bag.

- How do I match the attachment to the attachment at the top of the OEM bag. (schrader valves?) I assume are the ones you are talking about.
again, you add the fittings to the airlines that go to the air bags. but if you wanted to try the fittings at the compressor end are the same as the ones ontop of the bags.

ide just go out and buy a ready made kit. all the hard works already done

Thankyou
JB

from rave

The air supply unit comprises a 12 V electric motor, a compressor and air dryer unit, a pressure limiting valve, an
exhaust valve and two air supply control valves. The exhaust and control valves are solenoid operated responding to
signals from the SLABS ECU. The electric motor, compressor, air dryer and pressure limiting and exhaust valve are
mounted on flexible rubber mountings to reduce operating noise.
The electric motor drives a crank with an eccentric pin to which a connecting rod is attached. The connecting rod has
a piston which fits in the bore of the compressor. Operation of the motor rotates the crank, moving the piston in the
bore of the compressor.
The compressor is attached with Allen bolts to the motor housing and sealed with an O-ring. Attached to the
compressor is the air dryer which contains a silicate box for removing moisture from the compressed air. Air supplied
to inflate the air springs passes through the air dryer. When the air springs are deflated, the exhaust air also passes
through the air dryer, removing the moisture from the unit and expelling it to atmosphere.
Attached to end of the air dryer unit is the pressure limiting valve. The valve protects the air springs from over inflation.
The pressure limiting valve also operates when the exhaust valve is opened. The valve is pneumatically operated,
responding to air pressure applied to it.
The exhaust valve is also located with the pressure limiting valve. The exhaust valve is solenoid operated by the ECU
and directs air from the air springs and control valves to atmosphere when required.
The two air control valves for the LH and RH air springs are located at the forward end of the housing. Each valve is
connected to the compressor/air dryer unit through a shared single pipe which directs air to and from the air springs.
Each control valve is individually operated by the ECU.
All air connections to and from the air supply unit are made through the SLS air harness which is located along the
left hand chassis longitudinal.

on page 1025 of the D2 rave it shows the circut diagram of the sls system

cheers phil

**John W** · 7th July 2010, 08:10 PM

I was after a simple kit, I have recently replaced my second compressor! I put this in as a project.

The idea is to undo the air bag airlines from the valve block next to the compressor and then screw these airlines into two separate tyre valves. Then just connect an external tyre compressor or even a bicycle pump to the valve and pump up that sagging rear end, simple.

I found some brass tubeless valves at a truck tyre shop $10 each X2. Then drilled the opposite end to the valve out with 17/64 (6.8mm) drill bit to a depth of 16mm. Then this hole was threaded with an 8mm X 1mm tap. Cost $6 from the local Bolt Barn. This is the same thread on the ends of the air lines to the air bags.

You then need to chamfer the edge of the hole to accommodate the o-ring on the airline. Not too much and you are done.

You will need to take note of where the air lines come from as you want to put them back in their correct side on the valve block afterwards.

The compressor has a simple 12 V connector I would suggest you just pull this out when you want to bi-pass it. Plug up the valve block where you have unscrewed the air lines from to stop water and dirt getting in those and that should do it. Would expect that you may get SLS warning lights. Again I expect that you can ignore and drive on with you manual inflation.

Total cost $26. no permanent re-plumbing should only take minutes to fit and inflate. Kit is no more than the size of 2 tyre valves.

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