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#1
03-24-2016, 04:12 PM
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SlS Sag - Springs?
On my '81 300TD, the SLS seems to function fine when the engine is running. I.e., it rides perfectly level whether the rear is empty, full, or pulling a trailer. I replaced the accumulators 3-4 years ago, and there are no leaks. I have not ever adjusted the valve. In the morning, when I come out to drive away, the rear end is sagging low. When I start up and get underway, the system kicks into gear and it's level again. ************** on youtube is doing a series on the SLS, and Kent says that one cause of this symptom is worn springs.
Where would you look for the cause of overnight sagging?
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Mike 1980 300SD 1981 300TD 1998 E320 Gasser Wagon 2000 SL500 
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#2
03-24-2016, 04:18 PM
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It's not your springs. SLS sagging over night means it's time to rebuild your SLS valve.its bleeding pressure over night.
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2004 F150 4.6L -My Daily 2007 Volvo XC70 -Wife's Daily 1998 Ford F150 -Rear ended 1989 J-spec 420SEL -passed onto its new keeper 1982 BMW 733i -fixed and traded for the 420SEL 2003 Volvo V70 5 Speed -scrapped 1997 E290 Turbo Diesel Wagon -traded for above 1992 BMW 525i -traded in 1990 Silver 300TE -hated the M103 1985 Grey 380SE Diesel Conversion, 2.47 rear end, ABS -Sold, really should have kept this one 1979 Silver 300D "The Silver Slug" -Sold
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#3
03-24-2016, 04:25 PM
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The springs do less on the SLS system than on a car with a conventional rear suspension. Its very rare that the springs cause an issue.
dude99's response is correct.
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#4
03-24-2016, 04:27 PM
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Your SLS valve is leaking internally. Had the same problem on my wagon. The MBZ Classic Center has a rebuild kit for the valve. About $90. Be sure to index (mark) the position of the adjustment lever and rod before disassembly. There is a great DIY set of instructions somewhere on this forum. From memory - the system does not need to be bled once the valve has been rebuilt. The bleed screw is simply to relieve pressure on the system before removing the valve from the car. I rebuilt my valve about 1 year ago and the car has not dropped at all in that time. The rear springs seldom sag and the rear shocks seldom leak (according to Tom Hanson at the MBZ Classic Center).
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