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#1
10-07-2011, 03:36 PM
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Power Steering Basic Questions
Power steering seems weaker than it has in the past (1991 300D w/99k miles)....but it clearly still works. I renew fluid every 10k miles by draining and filling reservoir; filter was changed 20K miles ago.
What's the likelihood a clogged filter could account for anemic power steering? Do pumps fail/weaken gradually, or do they just go out at some point? Is there any way to describe, even quantify, what the steering should be like if everything is working properly? How can I figure out if the pump is working as it should? I HATE the thought of replacing the pump..... $$$$$$ part.
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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles 06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion 19 Honda CR-V EX 61k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife 
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#2
10-08-2011, 03:14 PM
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Wonder if some part in the steering linkage has or is becoming seized?
Changing steering fluid every 10K seems excessive, but you're only taking sips out if all you're doing is draining the reservoir. So you're never really getting a good exchange. Better to run the engine, pull the hoses, and flush it all out til it runs clear with new fluid.
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Cheers! Scott McPhee 1987 300D
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#3
10-08-2011, 03:43 PM
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Quote:
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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles 06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion 19 Honda CR-V EX 61k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife
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#4
10-08-2011, 05:27 PM
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Quote:
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#5
10-12-2011, 03:22 PM
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Just noticed that, on my 92, the PO had to replace the pump at 96,000 miles. So if mine is going out at 99,000 miles maybe that's par for the course.
So how long do people's pumps last??
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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles 06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion 19 Honda CR-V EX 61k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife
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#6
10-12-2011, 03:34 PM
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Did you also drain the steering gearbox?
What tire pressures do you run? A lower tire pressure would make steering feel stiffer.
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http://farm8.staticflickr.com/7271/7...144c3fc1dc.jpg
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#7
10-12-2011, 03:38 PM
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Quote:
I run tires at about 32 psi, so somewhat on the high side.
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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles 06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion 19 Honda CR-V EX 61k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife
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#8
10-12-2011, 04:23 PM
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PS Reservoir Filter
No big Deal to change,BUT follow FSM instructions!
Lack of required Fluid (Complete Change)and Filter (Replace per FSM) maintenance,CAN substantially shorten PS Pump Lifespan. I've one with over 188K on it with no problems. The Steering Gearbox fluid change is PART of the "Fluid Flush" (Search) BUT,BUT,BUT Do Not Attempt the "Flush" until you understand HOW FAST the PS Pump moves Fluid.(Like a 1/2 Gallon of Fluid in a NanoSecond) Running the Pump DRY during a Flush WILL FIX all your PS Pump Problems... You just get a New or Reman Pump! ALSO, a changeout to Redline Synthetic or Mobil1 fluid will Lengthen Pump Life.
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'84 300SD sold 124.128 Last edited by compress ignite; 10-13-2011 at 07:48 PM.
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