Removing power steering pump?

BHAMDOC1973

MEMBER
2007 MERCEDES BENZ S600
V12
TURBO
2WD
AUTOMATIC
101,000 MILES

I want to take a chance on this one. Removed belt and the pulley is a bit harder to turn that most pulleys are, not smooth, I think this is where the noise is coming from.

Saturday, August 6th, 2022 AT 1:10 PM

3 Replies

SQM

MECHANIC
6,383 POSTS

Hello,

The pulley should have some resistance, but it will turn smoothly.
So, it is possible that the bearing is bad.

One way to determine where the noise is coming from is to use an automotive stethoscope (see picture below) and put it on the hub/shaft of the pulley when the engine is running. This can make it easier to determine the source.

I have attached the power steering pump replacement procedure below for your reference.

Let me know of any questions.
Thank you.

https://www.2carpros.com/articles/how-to-replace-a-power-steering-pump

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Saturday, August 6th, 2022 AT 1:51 PM

BHAMDOC1973

MEMBER
1,657 POSTS

I checked and there was some from there but also from one of the belt pulleys, but the noise seemed like it was coming from above of the pulley on top left, area of the air check valve, but with belt off noise is gone.

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Saturday, August 6th, 2022 AT 2:11 PM

SQM