Before worrying about pressure, check the linkages between the height correctors and the control lever inside the car. Since both ends of the car are rising somewhat, and the height is the same (but low), I would check that first. What happens if you raise the lever inside the car? What happens if you add load to one end or the other? Does the car adjust?
As to pressure: I do not know for sure, but I imagine that the pressure management aspect of the system is as much a copy of Citroën's system as is all the rest, therefore: There is a central pressure regulator, located logically in the pressure circuit so that it controls fluid delivery to the "fifth" sphere, which is the central accumulator/pressure reserve sphere. On the 6.9 this sphere is on the driver's side adjacent to the suspension sphere. I don't know where it is on a W126. The system is designed around a common working pressure as delivered from that point on. This allows the pump to be variable output (with RPM). Extra fluid is simply routed back to the reservoir without pressure. Look for the place where the largest reservoir return line originates. This will be the pressure regulator (the line must be able to handle full pump flow, unlike the suspension element return lines which only handle leak-by). The pressure regulator (again, I'm talking about Citroën, you'll need to verify the MB implementation) has a ball valve and a calibrated spring. There's also an adjustment screw to set the relief pressure. NOTE: an under-pressure reserve/main accumulator sphere can weaken/damage the pressure regulator valve if there's too much cycling of the valve. You should test overall system pressure as measured on the CONTROLLED side of the regulator valve, and verify the gas pressure in the central accumulator. Those are the most important numbers. D. > On 1/6/2011 12:55 PM, Alex Chamberlain wrote: >> But the car, though at the same height front and back, won't >> rise to normal ride height overall. It's too low all the way around, >> by about three inches; >> >> Any suggestions appreciated! >> >> Alex >> > _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
