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Outstanding Contributor W221 Moderator
2010 E350 P1/P2, 2008 S550 Designo, 2002 ML320
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2,602 Posts
So I went to change my belt this weekend and found that the bolt through the center of the pulley is a Security Torx head (see picture). Does anyone else have this? If so, do you remeber what size it is? I hate to buy 12 bits when I just need one.
 

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Outstanding Contributor W221 Moderator
2010 E350 P1/P2, 2008 S550 Designo, 2002 ML320
Joined
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2,602 Posts
Well firstly, thanks for the bitset. There is a HF not 5 miles from me.

Secondly, this bolt is indicated as #4 in your diagram above. For my '95 S420 it is a male torx bolt, which I have a socket for. But for this thing it is as pictured below. Any thoughts?
 

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Outstanding Contributor W221 Moderator
2010 E350 P1/P2, 2008 S550 Designo, 2002 ML320
Joined
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2,602 Posts
I will take a look tonight and see if this moves with increased belt tension.

It does seem odd that they put a security torx bolt in this location, as if we are meant to pry in another location. I'll try to pop the engine cover and look behind it, and post some pics of course. Thanks!
 

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Outstanding Contributor W221 Moderator
2010 E350 P1/P2, 2008 S550 Designo, 2002 ML320
Joined
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2,602 Posts
That is IT! Thanks so much NorCal!!! :thumbsup: :bowdown:

I ordered the tools to remove the fan and will try this out this weekend after they arrive.

BTW, glad I didn't order the bit set yet. ;)
 

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Outstanding Contributor W221 Moderator
2010 E350 P1/P2, 2008 S550 Designo, 2002 ML320
Joined
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2,602 Posts
It's 108F here today, I'm changing it while it is still in the garage, not on the side of the road. :)


Change successful, no need for special tools. Thanks for all of your help Kajtek1, NorCal and supradupe. I changed it from below and it was quite easy.
 
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