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#1
11-10-2007, 03:52 PM
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1998 E300D-T Steering Noise, Pump? Leak? Air in Rack?
1998 E300D-T, 83,450 miles
W210, OM606.962, 722.6 Hope everyone has enjoyed autumn so far...some new MB projects, I'm sure! I have been having this slight annoyance with my 1998...whenever I take a turn at higher speeds and sharper angles (i.e. leaving my neighborhood onto a 45-mph main road, u-turns, etc.), I hear a whine and motor-noise from the steering wheel. Upon further inspection, I noticed some liquid surrounding the reservoir (black cap next to fuel lines and fuel filter). I have never adjusted the PS fluid since it is not a maintenance item in the service booklet (but neither is the lifetime-fill transmission oil, right?!?!?). Anyway, what could be causing this problem. Has anyone experienced a similar whine from the power steering system? Am I looking in the right place, and what can I do to correct the problem? Thanks!!!
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1982 300D-T (sold) 1988 300E (sold) 1994 E320 Wagon (sold) 1995 E320 1998 E300D-T 1999 E3204M Wagon 2001 E320 2005 E320 CDI 
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#2
11-10-2007, 04:16 PM
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Have you checked the level of the PS fluid?
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#3
11-10-2007, 04:18 PM
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No...because I'm unsure of how to check the level...hot? cold? engine running?
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1982 300D-T (sold) 1988 300E (sold) 1994 E320 Wagon (sold) 1995 E320 1998 E300D-T 1999 E3204M Wagon 2001 E320 2005 E320 CDI
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#4
11-10-2007, 04:25 PM
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Theres a dipstick on the underside of the cap. Engine off.
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#5
11-10-2007, 04:29 PM
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Dip stick has a hot and cold fill level IIRC.
There is a hose clamp that was allowing a little leakage on mine. Whined turning right when low.
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Terry Allison N. Calif. & Boca Chica, Panama 09' E320 Bluetec 77k (USA) 09' Hyundai Santa Fe Diesel 48k (S.A.)
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#6
11-10-2007, 05:00 PM
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I believe the fluid level was OK...MAX mark at 20C (had driven it about 1.5 hours before measuring...is 20C or 80C the correct temperature?). I will check clamps...how about any o-rings or seals that could be leaking or allowing air in?
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1982 300D-T (sold) 1988 300E (sold) 1994 E320 Wagon (sold) 1995 E320 1998 E300D-T 1999 E3204M Wagon 2001 E320 2005 E320 CDI
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#7
11-10-2007, 06:04 PM
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20c would be the cold fill level and 80c the hot.
Turning the wheel lock to lock against the bump stop bleeds it. If its whining it probably a bit low. Check it again both cold and hot. I dont think there is an oring at the HP line that attaches to the pump but the detail is poor so cant say for certain.
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Terry Allison N. Calif. & Boca Chica, Panama 09' E320 Bluetec 77k (USA) 09' Hyundai Santa Fe Diesel 48k (S.A.)
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#8
11-12-2007, 07:29 PM
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Slightly Below Min.
The level was slightly below the minimum line at 20C. What should be the next step? Is there a leak in the system, or is it normal for a car to lose a small amount of PS fluid over 85K miles?
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1982 300D-T (sold) 1988 300E (sold) 1994 E320 Wagon (sold) 1995 E320 1998 E300D-T 1999 E3204M Wagon 2001 E320 2005 E320 CDI
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#9
11-12-2007, 07:32 PM
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Mine was doing this too. I found the level to be low and located a small leak from the hose and fitting on the lower right side of the resorvoir. I cut off about 1/4" of the hose and re-clamped it and it's been fine ever since...
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-Evan Benz Fleet: 1968 UNIMOG 404.114 1998 E300 2008 E63 Non-Benz Fleet: 1992 Aerostar 1993 MR2 2000 F250
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#10
11-12-2007, 07:45 PM
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The fluid can foam up if it is very low which leads to false readings. Best to check it when cool after sitting a while so any foam subsides. Use the proper fluid, you can buy it at the dealer in 1L bottles and it is made by Febi I think. It doesn't hurt to suck all the fluid you can from the reservoir and refill it with fresh stuff since you will have plenty.
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Marty D. 2013 C300 4Matic 1984 BMW 733i 2013 Lincoln MKz 
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