W211 whine from engine sounds like pwr str pump

1995-Present : E200, E220D, E240, E290TD, E300, E300TD, E200, E240, E250, E280, E300, E320, E420, E430, E350, E500 E55AMG, E63AMG & incl. blueTEC & BlueEfficiency, All CLS models
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W211 whine from engine sounds like pwr str pump

Post by Rb30e » Mon 31 Oct, 2016 10:19 pm

Hi all,

Dead keen on joining the club, went to look at a 2004 AMG E55 today. Car has about 110000km or 65k miles thereabouts. Everything looked good on the car it has the full service history and had been serviced more frequently than 25000km stated interval which seems like ages. One thing that stopped me from putting a deposit on the car there and then; it sounded like the power steering pump was gone on it or so I thought. Same sound as a problematic power steering pump but the sound did not change tone when the steering wheel is turned. I couldn't figure it, wasn't coming from the supercharger which I thought may have been the case or any of the idlers. The mechanics who were checking over it for me seemed to think it was just noisy operation of the drive belt because its heavy duty and has to drive the supercharger. Dunno if this is an accurate diagnosis although I hope it is as then I will definitely put the deposit down tomorrow. Just wanted to research a little more before spending my hard earned.

Any advice would be much appreciated.


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300 SLR
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Joined: Fri 10 Oct, 2008 12:10 am
Model you own: w111
Location: Perth WA

Re: W211 whine from engine sounds like pwr str pump

Post by Bartman4800 » Tue 01 Nov, 2016 11:00 am

Dunno if I read it here or elsewhere. But I believe there is an O-ring on the intake side of the pump that can dry out.
The pump then starts to suck in air which makes it cavitate (noisy)

Also check the fluid level in the vessel.

1963 220 Sb Sedan "Kermit" (Australian Assembly)
1960 220 Sb Sedan "Zum Schlachten" (Early German Assembly, with a torsion bar spring for the bonnet) - Stored in Country WA
1981 Subaru Brumby 1.8 with Weber and 5-speed box "little utie" - Sold to another enthusiast!
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Re: W211 whine from engine sounds like pwr str pump

Post by Ivanerrol » Wed 02 Nov, 2016 10:41 am

If you are serious about buying one of these cars, make sure you get a pre purchase inspection from a qualified Mercedes specialist before hand.
Anything AMG has a price premium on it when it gets to servicing or spare parts.
W211 - E240
W204 - C280
W202 - C200, C180, C180
W126 - 380SE , 380SE (Ex SA Import), 560SEL
W124 - 300e, 260e (ex Japan)
W111 220s (Indonesia) 4 speed manual column shift
W123 230
W116 450SEL
W140 420SEL
W210 E240, E240
W209 CLK 240
W201 190e 2.6 (ex U.K.)

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