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"Gretchen" my 1986 300E 286000 km+ (RIP) August 2015
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Discussion Starter #1 (Edited)
Hello everyone, I own an 1986 300e and need to replace the idler pulley. I have searched the threads in many places and couldn't find what I was looking for.
Are there any special instructions on the removal of this part? DIY/Pictorial would be FANTASTIC !!!!

Thanks Again
 

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W124 Moderator
86 190E 2.3L 16V, 2 95 320TE's, 02 S500
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12,698 Posts
GHM,

The only special part of this process is the attention you need to pay to the tensioner. If you don't do this specifically, you'll just need to buy a new tensioner and adjuster rod. Trust me. There is a large 19mm bolt or 10mm allen hex that is located in the center of the tensioner. You must back off this bolt FIRST and tighten it down LAST. No kidding. Once you have backed off the tension, it is just a matter of taking the needed parts off and replacing them. After everthing has been re-assembled, tighten the belt tensioner with the adjuster rod and then tighten down the center bolt.

Good Luck,

Jayare
 

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"Gretchen" my 1986 300E 286000 km+ (RIP) August 2015
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Discussion Starter #3
Thank you for information. much appreciated.
 

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Premium Member
About a dozen 1988, 1989, 1990, and 1991 sedans, wagons, 4Matics and 1 coupe
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5,466 Posts
Keep in mind that there are 3 idlers and if one is shot the other two are not far behind. There's the one above the alternator, the one *on* the tensioner, and the one that the fan clutch/pulley bolt to. I forgot about that last one when I did my engine swap and paid for it later.
http://www.bos-engel.com/benz/failedidler.jpg
 

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"Gretchen" my 1986 300E 286000 km+ (RIP) August 2015
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Discussion Starter #5 (Edited)
I'm going to replace the idler pulley and the tensioner pulley, thanks for FYI
 
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