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Thread: What size torx is the I6 deflection pulley?

  1. #1
    Join Date
    Jul 2011
    Location
    New York
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    535
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    E39

    What size torx is the I6 belt tensioners?

    I tried to change the serpentine and AC belts, the belt tensioners had a plastic cap, underneath was what appeared to be a torx bolt, does anyone know what size? I tried a T50, no dice.

  2. #2
    Join Date
    Jul 2012
    Location
    mitten
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    3,760
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    525it,02 525it,73 2002
    Its Not a Trox. Its a allen head.

    I did water pump couple weeks back.
    dont know size off hand..


  3. #3
    Join Date
    Oct 2016
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    Norton Massachusetts
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    76
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    2003 530i M-sport
    Mine isn't a hex, it's a torx. T60 works great.

  4. #4
    Join Date
    May 2006
    Location
    Omaha, NE
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    4,196
    My Cars
    1998 528i 5-spd 102K
    - E39 comes in 2 flavors: pry the cap and use a mirror to look. It is either 8mm Hex or Torx #50.

    - To undo the mechanical tensioner, you need Torx 60.

    - I wrote a Partial Cooling Overhaul for my 2006 X5 M54 and you can see the detail below, my 2006 X5 M54 engine has a mix of both 8-mm Hex and T50! Go figure why these German engineers mixed different types of bolts!!!

    https://xoutpost.com/bmw-sav-forums/...16k-miles.html

  5. #5
    Join Date
    Sep 2006
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    Los Gatos CA
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    1987 325is, e34, Z3, e39
    The mechanical tensioner was often upgraded with a hydraulic tensioner. The retrofit kit didn't include fasteners, so there isn't a predictable fastener head.

  6. #6
    Join Date
    Jun 2010
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    Bay Area, California
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    325iT, 540iT
    It's not TORX it's TORX+. TP45 or 55 I think.
    Last edited by blarf; 06-22-2018 at 03:14 AM.

  7. #7
    Join Date
    Aug 2016
    Location
    Virginia,USA
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    528i, 525iT, M5
    Depending on the year and assembly point there were multiple vendors who supplied those parts. Each one including the aftermarket uses Torx, Torx+, Metric HEX (Allen Wrench as they invented it or at least popularized it in the US) hole, or in the aftermarket SAE (Fractional) Hex hole. Add a few tools to your fishing tackle box and you will find out what you have. IT IS NOT ROCKET SCIENCE.
    Where to buy tools: Sears, Harbor Freight, https://www.tooltopia.com/ (my favorite), Amazon, the local big box store (Home Depot, Lowes, even Costco). The real question for you is do you want to build up a set of tools that you can use over your lifetime or do you just add odds and ends so your hunting all your life trying to discover what tool is needed so off you go to ask someone else? Pick a path....

    Before someone else chips in and says the solution to every issue is a BFH, get one of those too....
    Last edited by StephenVA; 06-23-2018 at 10:37 AM.
    Current Garage Highlights
    2003 525iT TiSilver
    2002 M5 TiSilver
    1998 528i KASCHMIRBEIGE METALLIC (301) (Goldie)

    Former Garage Highlights
    2005 X5 4.8is
    2004 325iTs (2x)
    1973 Pantera L
    1971 Dodge Dart Swinger "Lite Package"
    1970 Dodge Challenger T/A 340 Six Pack Alpine White
    1970 Dodge Challenger T/A 340 Six Pack GoManGo Green
    1969 Road Runner 383
    1968 Barracuda Formula S 340 Sea Foam Green

  8. #8
    Join Date
    Feb 2014
    Location
    Alexandria, VA
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    ‘01 540’00 528T’03 525T
    I pay for the tools to come to me... .. . SnapOn!
    Set the controls for the heart of the sun

  9. #9
    Join Date
    Aug 2016
    Location
    Virginia,USA
    Posts
    3,144
    My Cars
    528i, 525iT, M5
    Now now, don’t mention that tools purchased for a life time are more effective, better engineered materials and you really do get what you pay for when buying high quality tools when compare to pot metal junk as it will be lost on the fishing tackle box crowd!
    Those who invest in tools always end up prepared for 90% of DIY projects.
    Meanwhile at the local pick a part there are people taking the “toolsets” found in the trunks as BMW special tools.....😀

  10. #10
    Join Date
    Sep 2006
    Location
    Los Gatos CA
    Posts
    4,246
    My Cars
    1987 325is, e34, Z3, e39
    You can (apparently) sell the BMW tools for $$$. And they just toss them into their bag, so they don't cost anything.

  11. #11
    Join Date
    Aug 2016
    Location
    Virginia,USA
    Posts
    3,144
    My Cars
    528i, 525iT, M5
    There, another tool source and income generator...
    Current Garage Highlights
    2003 525iT TiSilver
    2002 M5 TiSilver
    1998 528i KASCHMIRBEIGE METALLIC (301) (Goldie)

    Former Garage Highlights
    2005 X5 4.8is
    2004 325iTs (2x)
    1973 Pantera L
    1971 Dodge Dart Swinger "Lite Package"
    1970 Dodge Challenger T/A 340 Six Pack Alpine White
    1970 Dodge Challenger T/A 340 Six Pack GoManGo Green
    1969 Road Runner 383
    1968 Barracuda Formula S 340 Sea Foam Green

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