CLK-Class (W209) 2003 on: CLK 270 CDI, CLK 200K, CLK 200 CGI, CLK 240, CLK 320, CLK 350, CLK 500, CLK 550 [Coupes & Cabriolets]

W209 generator wear

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Old 10-20-2017, 01:14 PM
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CLK320 CDI
W209 generator wear

Hi MBworld,

Just pulled the generator off my CLK320CDI intending to change the voltage regulator and discovered this:


I would really appreciate if some body could tell meh if it is too far gone to add a new voltage regulator?
Old 10-20-2017, 10:14 PM
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"what" did you discover? I guess you mean to attach a photo?
Old 10-21-2017, 03:41 AM
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Here is the picture. Worn out or not?



Dear Rodney, I very much appreciate your reply. I actually did attach a picture in the original post. But somehow it appears all black to other users of MBWorld. I have attached it again and now at least my son can see it right. What I am in doubt about is whether the contact points are too far worn to accept a new voltage regulator and actually work properly. SO any input regarding that is very welcome. Keys words: W209 generator wear

Last edited by Claus Bornęs; 10-21-2017 at 04:10 AM. Reason: more info
Old 10-21-2017, 12:40 PM
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I think you are going to need a new alternator. That outer brush contact surface on the rotor pole is deeply worn. It should look just like the inner contact surface. If you have a Bosch alternator, you can buy a rebuild kit of just the rotor and bearings, but the Valeo is not rebuildable. You will also need a new regulator (as I am sure its outer brush is defective). At this point, you're likely better off buying a whole unit, with the regulator and all ready to install. Here in the USA, several of our retail auto parts stores (Advance Auto, Autozone, etc.) sell a rebuilt unit with a lifetime warranty for around $200. OEM new is more like $450. I put an Advance Auto brand reman on in my SL550. It was stamped "China", but it was the OEM Bosch alternator, just rebuilt in China.
Old 10-30-2017, 10:18 AM
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Dear Rodney,

Thanks for reassuring me about the state of the generator. My own assesment was also that it was way goen. Just wanted to make sure that it wasn't a fancy new way to make these contact surface. I ordered a new generator, complete with regulator installed it (a lot of work) and now the car charges nicely again.

All thé best, Claus

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