Will CLK 2007 220CDI have alternator clutch?

[Droverunner]

At 115K mls I'm doing a water pump, tensioner, idler pulleys and aux belt change. I wondered though if I should have an alternator clutch on this car? When I had the aux belt off the other day I noticed the alternator pulley was solid with no clutch action. There is no rattling or noise from the alternator and if it shouldn't have a clutch then no problem... if it should and mine is seized I'll replace it.

Is there any way from looking to know if you have a clutch or not?

If I did find a replacement needed is this tool OK for the job... http://www.ebay.co.uk/itm/22pcs-Alt...683425&hash=item3acf288786:g:wtQAAOSwFnFV~maD

I see there are cheaper tools like this... http://www.ebay.co.uk/itm/Mercedes-...epid=0&hash=item3aec6a704d:g:BGUAAOxykUZTh7Kp but I assume to need something to go up the middle to hold the alternator shaft still??

 

[om613]

You'll almost certainly have a freewheel pulley.
My 2002 E class did.
I bought a cheap £5 tool and chopped down a TX bit to go through it.
They can be quite tight to crack off...

 

[Droverunner]

Thanks. I'm doing the water pump etc tomorrow and will look at the alt pulley more closely. I think once the plastic cap is prised off the front of the pulley it will be possible to see if it is a clutch type or not.

Re the tool I'll just get the cheap spline thing as I have loads of torx bits I could make fit. I wonder though if anyone knows the exact type I need as they seem to have different amounts of splines.

 

[Droverunner]

Did the water pump and pulleys swap today. Popped the plastic cap off the alt pulley and it's clearly a clutch type that's seized solid so I'll get a pulley and the tool.

 

[Droverunner]

I must get onto this soon. Can anyone confirm if our CLK alternator pulley will be the 33 spline like this tool?

http://www.ebay.co.uk/itm/ALTERNATO...256545&hash=item4b209f7619:g:jPkAAOxyLtFTjyO-

Or perhaps this is better as the complete tool...

http://www.ebay.co.uk/itm/S-XA17H-A...836405&hash=item1c6d3cbbd7:g:DD0AAOSw6n5XtsSB

 

[Droverunner]

Well I've confirmed my own question. The overrun pulley and tool arrived today. The correct tool for our 2007 CLK 220CDI alternator pulley is this one...

http://www.ebay.co.uk/itm/S-XA17H-A...836405&hash=item1c6d3cbbd7:g:DD0AAOSw6n5XtsSB

33 splines for the pulley and M10 to hold the shaft.