SLS troubleshooting

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scarab
Posts: 25
Joined: Sat May 23, 2020 11:29 pm
Location: US

SLS troubleshooting

Post by scarab »

I’m not sure if my SLS is working properly. Honestly there’s not much information about it, everyone just gets rid of it and I don’t wanna go that route. I figured my SLS pump was running all the time, I’m not sure if that’s expected behavior. There was a small leak underneath it so I decided to rebuild it. I’ve purchased the kit from Ray and installed it. Today I mount the pump back and refilled the reservoir with fresh Febi M6162. The leak is gone, I let the pump run for like 15 minutes and seems to be working fine as the fluid level went down from max to min. Ride height went up about half an inch. But the pump kept running, it turns off for a while only once I hit the brake pedal. Is this normal? Once I turned the ignition off fluid level went back from min to max in like 5 minutes. I don’t see any leaks on shocks or anywhere but I’m still not sure if that’s the way SLS should work. Here is the stance of my E24 before pump rebuild. Is it normal or low?
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Luke
'88 635CSi L6
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Sbeaud
Posts: 279
Joined: Fri Jan 04, 2019 9:38 pm
Location: Okahumpka, Florida USA

Re: SLS troubleshooting

Post by Sbeaud »

Hard to say with a picture on a dirt surface. But the tire to fender opening would suggest it's off. I'll show my vehicle as reference, but I can't vouch that it meets factory trim level.
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1988 M6
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Sbeaud
Posts: 279
Joined: Fri Jan 04, 2019 9:38 pm
Location: Okahumpka, Florida USA

Re: SLS troubleshooting

Post by Sbeaud »

I'll update this thread since I am now also needing to troubleshoot my SLS. Further investigation provided the following.

From the factory repair manual section 37 page 3:
BMW Repair Manual Ride Height.JPG
BMW Repair Manual Ride Height.JPG (23.26 KiB) Viewed 2105 times
From the factory specifications manual section 37-12:
BMW Repair Manual Ride Height.JPG
BMW Repair Manual Ride Height.JPG (23.26 KiB) Viewed 2105 times
My system is now randomly dropping/raising so I'll have to do some work...

Scott
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1988 M6
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Sbeaud
Posts: 279
Joined: Fri Jan 04, 2019 9:38 pm
Location: Okahumpka, Florida USA

Re: SLS troubleshooting

Post by Sbeaud »

Just noticed I posted the E32 spec! Disregard that and use this specification information.
BMW Specs Manual Ride Height.JPG
BMW Specs Manual Ride Height.JPG (111.23 KiB) Viewed 2103 times
BMW Specs Manual Ride Height - non M.JPG
BMW Specs Manual Ride Height - non M.JPG (127.11 KiB) Viewed 2103 times
Scott
1988 M6
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Sbeaud
Posts: 279
Joined: Fri Jan 04, 2019 9:38 pm
Location: Okahumpka, Florida USA

Re: SLS troubleshooting

Post by Sbeaud »

Didn't notice this before, but it's interesting that the M6 measured height is greater than the base 633/5 by 10mm. :-k I assume the base vehicle had higher profile tires (non-TRX as well), so possibly the ground-to-body measurement would be the same between the base and M6?
1988 M6
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