supercharger belt tensioner failure

Discussion in 'AMG Lounge' started by dddrrift, Apr 9, 2015.

  1. dddrrift

    dddrrift New Member

    Messages:
    15
    Joined:
    Mar 27, 2015
    Car:
    SL55 AMG & M3
    anyone had this tensioner fail? This may be useful to those that are handy with a spanner! Mine recently developed a rumble and I could visibly see the pulley wobbling when the engine was running.

    Priced up a new tensioner which worked out around £130 online, however I decided to dismantle the one I had and see if I could replace the bearing.

    Bought a new high speed 6303 skf bearing for £4.50 :)

    you remove the tensioner mounting bolts x2

    lock the tensioner using a drill bit or small screwdriver

    loosen the large centre bolt, its a male torx

    remove the pulley and drill the 5 pressed rivots, the pulley will now split in half and you can remove the bearing, replace with the new one and assemble again. I used 5mm rivots to join the pulleys again.

    Job jobbed and £125 saved! :)

    The other belt tensioner uses the same bearing although is a plastic pulley, I havnt yet tried to replace it!
     
  2. Andrew W

    Andrew W Active Member

    Messages:
    438
    Joined:
    Oct 26, 2014
    Car:
    Vw caddy
    Nice work , if your capable its amazing
    How you can save yourself a few quid ;)
    although it goes back in the fuel tank ;)
     
  3. OP
    OP
    dddrrift

    dddrrift New Member

    Messages:
    15
    Joined:
    Mar 27, 2015
    Car:
    SL55 AMG & M3
    your right there! I will post a few pictures when I get a chance! Its a Handy DIY!
     
  4. BigFactHunt

    BigFactHunt New Member

    Messages:
    9
    Joined:
    Jan 6, 2015
    Car:
    e55
    arent you referring to the idler pulleys? the tensioner puller is just to the upper right of the idler pulleys and is a single pulley supercharger only, the idler pulleys I believe, as you point out have one metal pulley (supercharger) and a plastic (accessories)
     
  5. OP
    OP
    dddrrift

    dddrrift New Member

    Messages:
    15
    Joined:
    Mar 27, 2015
    Car:
    SL55 AMG & M3
    no, im referring to the tensioner for the supercharger belt on an SL55 AMG, its a metal pulley.

    Probably should have said what car I was working on!lol
     
    1 person likes this.
  6. Mrhanky

    Mrhanky MB Enthusiast

    Messages:
    1,592
    Joined:
    Jun 19, 2014
    Car:
    Superb 3.6 4x4 & W221 S500
    Yep its an easy DIY if you have the tools and your confident enough. Ive done three of these, I now have it down to a fine art.

    I just wished I had more time to do these sorts of jobs as I enjoy them. Probably as its so polarised compared to what I normally do.

    Spent most of last night looking and considering doing the split cooling mod.
     
  7. OP
    OP
    dddrrift

    dddrrift New Member

    Messages:
    15
    Joined:
    Mar 27, 2015
    Car:
    SL55 AMG & M3
    wouldn't say much confidence is even required! if you can operate a ratchet and a few sockets anyone could do this! Saved me a few £££ and perhaps will save some other people some £££ too

    the split cooling mod wouldn't be too hard either I don't think, give it a go!
     
  8. Mrhanky

    Mrhanky MB Enthusiast

    Messages:
    1,592
    Joined:
    Jun 19, 2014
    Car:
    Superb 3.6 4x4 & W221 S500
    Exactly my point and of course drilling out the rivets and then pressing the bearing and then the re-revit
     

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