I have a 79 300SD in excellent condition. Have maintained timely and normal service for my car (oil/fluid changes, etc.,...) but in the last month or so...have started hearing a "yawwing" sound when I turn the wheel. It's normally much more pronounced upon starting the car early in the day and eases off the longer I drive - although it's still noticeable when I drive.
Warm weather (I live in Los Angeles) seems to make this less pronounced as well.

I still have the original Mercedes owners book and it mentions power steering fluid as somehow connected with the Transmission fluid (?) but haven't found any specific valve for power steering fluid. I'm about to just take it to my mechanic but don't want to bring it in only to be told...just add some poewer steering.

Does anyone out there know what I can do? Is there an actual power steering intake under the hood? Or is this a sign of a different issue?

How is the fluid level? Pull off the nut and cap and take a look. The system is seperate from the transmission.

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine

i am not sure he knows where to look...the PS nut he is talking about is on the right side of the engine (while standing at the front looking to the back) it is a winged nut. it will be just behind the pulleys, and i believe just to the front and right of the 22 mm bolt.

it has been a bit since i have seen my 80SD so i might be a bit rusty.

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-Trevor

OBK #12
1980 300SD 333,XXX miles - Totaled
1986 Mazda RX-7 212,XXX miles - impounded and auctioned off
2005 Jeep Liberty CRD Limited 33,000- SEGR, Provent, Fumoto