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Old 02-25-2007, 06:31 PM   #1 (permalink)
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serpentine belt change

can the serpentine belt be changed by regular guys like us...or does it need to be done by a pro? If we can do it ourselves can anybody point me to a procedure? Is it like changing it on american cars?

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Old 02-25-2007, 06:40 PM   #2 (permalink)
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If your hood doesn't have a routing diagram, make one before you start. Place a box end wrench of appropriate metric size on the bolt end of the spring tensioner pulley and release the pressure and slip the belt off with the other hand. Replace new belt by putting it on all pulleys before the tensioner, release tension by holding the pulley back with the wrench and slip new belt on. You may want to try releasing the pressure a couple of times to get the feel of it.
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Old 02-25-2007, 08:57 PM   #3 (permalink)
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Same topic goes in 210 section, that shares the engine.
The tensioner has big hex for pulling the tensioner out and smaller center bolt is locking it.
You need a long box wrench to take the tension off and than you can slip the belt off. I think for easier job you can pull the tensioner out and lock it in this position with smaller bolt, what would leave you 2 hands to deal with the belt, but I never actually tried this method. Sizes wary supposable 13-17 mm for tensioner and smaller bolts come with different sizes and shapes.

Last edited by Kajtek1; 02-26-2007 at 02:52 PM.
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Old 02-25-2007, 09:32 PM   #4 (permalink)
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This is a really simple job. It will take you longer to get the right socket heads selected than it will to put the new belt on (my original has a Torx female but my new one was completely different). If you have the original idler pulley with over 100,000 miles, I predict the idler pulley bearings are rough and noisey (spin the idler puller once you have the belt off). My tensioner bearing also starting making lots of noise a few hundred miles after the new belt was installed. The bearing was clearly into failure mode.

Removing the single nut (36mm) holding the fan to the fan clutch is fast and makes the belt replacement, tensioner and idler pulley a breeze (in fact on the ML430 you must remove the fan to get the idler pulley bolt out). This is intended to be honest input AND sort of self promoting since I have an extra 36mm thin, long wrench I'd love to sell.
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Old 02-26-2007, 11:43 AM   #5 (permalink)
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Thanks!

I appreciate the help, and quick response. Ya'll have a great day!

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Old 06-24-2007, 01:52 PM   #6 (permalink)
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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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Old 06-24-2007, 02:23 PM   #7 (permalink)
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Go on and buy the set. You know you will be happy to know that you have them all and can spend the next month looking for a use for them.

Seriously, how much is a set?
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Old 06-24-2007, 05:39 PM   #8 (permalink)
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This is the first time I've heard about security fastener on belt. Are you sure you are looking at right bolt?
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Old 06-24-2007, 08:14 PM   #9 (permalink)
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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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File Type: jpg torx_security.JPG (3.8 KB, 3043 views)

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Old 06-24-2007, 09:31 PM   #10 (permalink)
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Wait. There must be a reason why it is safety bolt. That doesn't look like tension mechanism. Might be just the rerouting wheel. It looks quite different on my 99 and 01 engines.
I am not familiar with your set up, but if you are not sure what is the tensioner, push the belt where you can and see what pulley will move. That would be the tensioner. Your picture is dark, but there might be spring mechanism behind the wheel.?
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