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Old 03-12-2008, 03:52 PM
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Join Date: Dec 2007
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81 300TD SLS Pumps engine oil into SLS?

Hello All..

I have a 300TD wagon and I believe the SLS pump may have gone sour.

When I bought it the system didn't seem to work. I discovered that the valve lever was loose and I tightened it. I brought CHF 11S fluid (listed as compatible- its the green citroen stuff) because the reservoir had about an inch of black fluid in the bottom of it. I flushed the system by getting 550lbs of sandbags in the back and raising and lowering the system while draining the return line into a can and filling with new fluid. After 3 liters it came out green and I hooked it back up. It was at the max line. I then tested for adjustment and had the suspension so it would sit on the springs at 14 inches from MB star to fender lip with no load and lever in down position. Then it would be neutral at the same level, and after loading in 550lbs it would raise to the same 14 inches. Drove the system unloaded for about 2 or 3 weeks, and then went to replace the rear brakes. When I jacked it up on the pumpkin (wheels hanging) I discovered a huge oil slick under the front of the car. Popped the hood and the SLS reservoir was overflowing BAD. I removed the dipstick, and there were big 'waves' as a lot of air came out of the top- pushing black fluid with a ton of air bubbles in it out the top. (car was running) I figured it was the system venting air that I never vented and I just let it run out. Today I came home and popped the hood to check and it was overflowing everywhere again. I checked the oil dipstick (just did an oil change about 1,500 miles ago when I bought it) and it wasn't on the dipstick. I went to get some more Rotella T and filled it- but now it seems like the engine oil has strangely similar mini bubbles in it. Also- the reservoir stopped overflowing after I added engine oil? (Might have been dreaming here)

Is my pump shot? Does anyone know if there is a rebuild kit? Can I continue to drive it until I get it rebuilt or is it pumping SLS fluid into the engine oil as well?

Thanks (sorry its so long)

Tim

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Old 03-12-2008, 04:04 PM
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Join Date: Dec 2004
Location: Albany, OR
Posts: 4,845
Sounds like the pump is leaking and allowing motor oil to get into your SLS fluid. There is a guy named George Murphy or Performance Analysis that sells a seal kit for the SLS pump, here is his info.
George Murphy
Performance Analysis Co.
969 Oak Ridge Turnpike, Suite 258
Oak Ridge, TN 37830
865-482-9175 9 am to 5 pm ET M-F

He sells a bunch of MB stuff. He has a SLS seal kit for about $40. Give him a call he has a cataloge he will send you for free. The SLS kit comes with instructions.
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'04 Jetta TDI Wagon
'82 300TD ~ Winnie ~ Sold
'77 300D ~ Sold
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Old 07-10-2008, 04:33 PM
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Location: NW Indiana
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My SLS fluid is also very dark, however I've never flushed the system. Does dark fluid automatically indicate that that there is a seal leak allowing engine oil into the system or may I it just be dark from wear and tear. I'm not having any overflow issues or loss of engine oil as knipdlo indicated he was having. Just a saggy rear (when engine is off..I assume leaking seals in the valve).
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Old 07-10-2008, 05:22 PM
ForcedInduction
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The SLS oil should be changed like the transmission oil, every 30,000miles or 1-2years. If its neglected for several years it will eventually turn brown/black.

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