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Old 12-26-2012, 06:54 AM   #1 (permalink)
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Help needed changing an Alternator on 2009 300c diesel

Good Afternoon, I'm hoping some kind soul will be able to point us in the right direction for changing a defunct alternator on my 2009 300c diesel (UK) like how to take the tensioner off, or any tips, thank you
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Old 12-26-2012, 11:58 AM   #2 (permalink)
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from my experience only and not necessarily the correct way.

first you need to clear everything off the front of the engine to both get to the tensioner and remove the alternator... intercooler pipes, air resonator box, glow plug relay control module and air flow box.
the small bracket below and left of the air box which supports the box to the engine block also needs to come off to get the alternator out.

to relieve the tension you need a long socket bar and a suitably sized torx socket.

on the tensioner is a small torx head casting, below and right of the centre bolt, which you place the socket on and turn anti clockwise to relieve the tension.
mine was broken off and a real pain doing the job.

look closely, there is a hole in the right hand side of the tensioner and body, about 2 o'clock, into which you push a drill bit etc to lock the tensioner when it's pulled back.
if you dont lock it you will have fun pulling it back to replace the belt.


to remove the tensioner completely do the same but once locked back undo the centre stud and lift the tensioner off

good luck with the change....it is a pain in the neck.

Last edited by Pappajohn; 12-26-2012 at 12:00 PM.
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Old 12-27-2012, 03:23 AM   #3 (permalink)
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Alternator changed, bit of a long job! going to buy a splash shield now, don't want the same thing happening to the new alternator, why on earth do Chrysler not fit as standard if they know that this happens. Once again many thanks for your post Pappajohn
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Old 12-27-2012, 06:49 AM   #4 (permalink)
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