SLS Compressor - Servicing the damn thing
I have a 1989 DA LTD and over the course of many weekends I have been fixing the SLS to work again and was successful after a few trips to the wreckers.
I know most people think the SLS is shit and get rid of it but you can fix it yourself with a couple of hours, and thats the point.
The following paragraph is how to service the compressor if you nail it down to this is where the problem is using the SLS self diagnostic test, and reason for this post.
It can be serviced. Ford says it cant but its a crock of shit. Take the damn thing out and then take it apart. Note where the wiring goes and dont stuff up here. The solenoid inside the compressor will die if you pass current to it the wrong way.
1. Look at the graphite rings on the piston and check for leakage
2. Remove the solenoid and check O ring
3. Remove and replace inner air filter - this normally blocks and fails causing the SLS to fail. On both of the compressors (fitted & spare part unit sourced from wreckers) this was the cause of the lack of air being passed to the shockers.
4. Check motor for operation. Is a Bosch so shouldnt fail.
5. You can sand the rust of the damn thing but be careful. Use wet & dry.
5. Put it all back together applying heat resistant liquid gasket where required. Replace defective parts with parts sourced from wreckers.
6. Replace the dryer with something a little newer from wreckers. There is some sort of pressure valve within this but you cant undo it. It has to be replaced. Check the seals at both ends when refitted for leakage with detergent water.
The rest is up to you. Always check your air shockers first especially the one next to the exhaust and check for a failed T piece behind the back right seat.
Somebody else can provide the SLS dianostic signal results as I have forgotten them.
My car has 285K on the clock and has had the air shockers replaced twice and only now have I had problems with the compressor. I dont use it to tow anything of weight.