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I have a 2008 C300 4Matic with the M272 engine. I suspect that either my alternator or power steering pulley is bad. I am going to replace the whole alternator soon, but was just curious if anyone knows if it’s possible/feasible to change the power steering pump pulley by itself without changing the whole pump? I already did a fluid drain and fill a month ago before I suspected the pulley so I would prefer to not have to buy another liter of fluid if possible. Thank you!
Yes you can change the pulley but they don't sell just the pulley. So your only option is to find a used one in a junk yard or on eBay.
I don't see how the pulley can make noise tho cuz it's pressed on pretty solid.
If you have a squeaky noise you can't find have you tried running the engine without the oil cap on? If you do this and there is allot of vacuum at the oil fill hole and there squeal goes away then you have a bad PCV diaphragm and it's sucking air in making noise.
Yes you can change the pulley but they don't sell just the pulley. So your only option is to find a used one in a junk yard or on eBay.
I don't see how the pulley can make noise tho cuz it's pressed on pretty solid.
If you have a squeaky noise you can't find have you tried running the engine without the oil cap on? If you do this and there is allot of vacuum at the oil fill hole and there squeal goes away then you have a bad PCV diaphragm and it's sucking air in making noise.
I’m going to a junkyard next weekend, any idea of what the removal process is or if I need any specialty tool like the harmonic balancer would need?
And I’m not chasing a squeak, I’m chasing whatever is making my belt bounce around. New tensioner and idler pulleys and belt and still no luck making my belt stable. It causes a vibration at idle that is removed if I run the engine without the belt. Harmonic balancer looks to be good, alternator is definitely contributing but if it isn’t that my best guess is the power steering pulley so I figured I would do some asking around.
So yes you would need a power steering pump pulley puller. You can borrow one from a auto parts store. You tube and you will see how to use the tool. It's pretty straight forward and the tool will also install the pulley.
The belt bouncing could be the alternator pulley as it is a one way clutch on that pulley that is supposed to stop belt bounce when you accelerate fast then let of the accelerator the pulley will slip. You should be able to check that with only removing the belt and use something to stop the alternator from spinning. Then you should only be able to soon the pulley in one direction. I'm assuming you have the alternator with the clutch on the pulley.
So yes you would need a power steering pump pulley puller. You can borrow one from a auto parts store. You tube and you will see how to use the tool. It's pretty straight forward and the tool will also install the pulley.
The belt bouncing could be the alternator pulley as it is a one way clutch on that pulley that is supposed to stop belt bounce when you accelerate fast then let of the accelerator the pulley will slip. You should be able to check that with only removing the belt and use something to stop the alternator from spinning. Then you should only be able to soon the pulley in one direction. I'm assuming you have the alternator with the clutch on the pulley.
How can I tell if there is a clutch on the alternator? I don’t see anything obvious but I imagine it wouldn’t be external like on the A/C compressor. What’s the best way to stop the alternator from spinning?
The clutch is like a one way roller bearing that is inside the pulley off the alternator.
To know for sure remove the belt. Jam up the alternator with something so it won't turn then try to turn the poult both directions. Should not turn one way since the alternator is jammed up by us and should turn the other way even tho the alternator don't spin.
The clutch is like a one way roller bearing that is inside the pulley off the alternator.
To know for sure remove the belt. Jam up the alternator with something so it won't turn then try to turn the poult both directions. Should not turn one way since the alternator is jammed up by us and should turn the other way even tho the alternator don't spin.
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