How to Replace an Overrunning Alternator Pulley - Mercedes C/CLK/E Class

[@vincemarshall8550]

hoping to do this on my fiat doblo ,taking the alternator off involves all kind of mental gymnastics ,great vid ,thanks

[@mrsinghsgarage]

Glad you found it useful:) I can imagine it was a tight squeeze to get the alternator out! Good luck for the pulley replacement.

[@vincemarshall8550]

@@mrsinghsgarage thanks mr singh x

[@Propriis.automotive]

I have a om646.811 and I belive it's the pully also was it clicking slightly at idle but as soon as you hold revs slightly higher it goes away ??

[@mrsinghsgarage]

@@Propriis.automotive It wasn't clicking, but it was squeaky

[@jagvolvo33]

can you explain why it needs to turn clockwise a little then wound off anti clock wise it dosnt make sence??

[@mrsinghsgarage]

@@jagvolvo33 The part I'm turning clockwise to loosen is the shaft of the alternator, and the spanner is holding the pulley in place. When I'm spinning it off by hand, the pulley is turning anticlockwise, but the alternator shaft stays still in place. When I'm turning the shaft clockwise, the pulley is effectively being turned anticlockwise to wind off the shaft. Think of it like the pulley is a nut and the alternator shaft is a threaded rod. If you turn the nut anticlockwise, it will loosen. However, if you turn the threaded rod clockwise (from the same point of view), then you will also loosen the nut. I hope that helps!

[@williamkennedy5492]

Thats a very good video, I have a W212 E220 and Mr Mercedes gave little thought to maintenance access.. I have a problem following the cars auto box service by Mercedes at 148k, you now feel the car jump as drive is selected, its ok in reverse, Also slowing down through 40 and 20 you feel the car change down. Its very noticeable. The car has been back to Mercedes and fluid levels are correct, BUT the service manager did mention this over run pulley, I cannot see the connection between that pulley and my gearbox can you ?

[@mrsinghsgarage]

@@williamkennedy5492 It sounds like the service manager is lying. You'd notice the pulley at idle, as the belt would bounce slightly. It sounds like your gearbox might have already had some wear internally, and fresh fluid has magnified that wear.

[@erdoganog]

do these pulleys make any noises before they go out or some bearing noise normal ? 70k on e300

[@mrsinghsgarage]

The idler pulleys are more common to produce noises when they're failing. The only noise that the alternator pulley will produce is a squeak when you shut off the engine.

[@konstantin-big]

What is the difference between OAP and OAD??? Can we see the difference with eyes??? Can we replace an OAP pulley with an OAD pulley????

[@samblease1570]

Thpught ypu had handcuffs on in the beginning 😅

[@mrsinghsgarage]

@@samblease1570 Haha, yeah it's called a Kara. I'm a Sikh and I wear it for religious purposes

[@toufikhaddad1094]

MerCi