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#1
05-07-2011, 02:09 PM
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Power Steering Fluid Foaming
I just completed a complete Power Steering System replacement on a 1998 ML320 with 237k miles. I am the original owner and have the entire service history since new.
The work was done mainly because the original steering rack was leaking at the driver's side inner tie rod boot. This project included a ZF Factory rebuilt steering rack (rack and pinion unit), new MB OEM hi pressure and return hoses with new O-rings, outer tie rods left and right, ZF Factory rebuilt power steering pump, O-ring and OEM reservoir (filter). I have flushed about 5quarts of new PS fluid through the system. When I button everything back up, top up the fluid and run it, the PS fluid is frothy with what seems to be air entrainment. Any recommendations appreciated on what to look for next. Thanks, Ken
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2014 E250 Bluetec 4-Matic 2014 GL350 Bluetec 4-Matic 1996 Chevy Tahoe 4 x 4 2009 ML350 (sold) 2005 SLK350 (sold) 1999 E300 Turbodiesel (sold) 1998 ML320 (sold) 1991 300D 2.5 Turbodiesel (sold) 
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