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Thread: What bolt head T4 2.5 petrol head bolts

  1. #1
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    What bolt head T4 2.5 petrol head bolts

    I must have misread a bunch of advice and sourced an RT10 Ribe 1/2" bit for the head bolts on my T4, however on closer inspection they appear to be a spline.

    Are these triple squares M12s?

    Asking before I spend more of my hard earned on tools I will never use again.

    Darren.
    Attached Thumbnails Attached Thumbnails What bolt head T4 2.5 petrol head bolts-img_20220329_174232-jpg  

  2. #2
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    I think I've answered my own question - looks to be a triple square when I zoom in on the photo. Are these what most shops sell as spline bits? Now I just need to sus out what size it is...

  3. #3
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    I just did this job to my 98 Caravelle. Definitely 12 triple square. Beware of the FAI head bolts, the ones I got had defective heads, the bit wouldn't fit in. They can't have made just one box of them.

  4. #4
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    My T5 BPC was M12 x 1.75 12 point - so triple square.....I used Elring.
    2014 Skoda Yeti TDI Outdoor 4x4 | Audi Q3 CFGC repower | Darkside cams | Darkside dump pDPF | Wagner Comp IC | Water Meth | Bilstein B6 H&R springs | Rays Homura 2x7 18 x 8" 255 Michelin 4s | Golf R subframe | Superpro sway and bushings | 034 engine mounts | MK6 GTI brakes.

  5. #5
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    Quote Originally Posted by TransporterDaz View Post
    looks to be a triple square when I zoom in on the photo.
    Another name for them is XZN or multispline As for the size, I would buy a 12mm as suggested on the
    understanding that it can be exchanged for another size if it doesn't fit.
    I have different sizes of these & have needed them more than once.
    Understand how it works, troubleshoot logically BEFORE replacing parts.
    2001 T4 TRAKKA Syncro 2.5TDI,2006 Mk5 2.0TDI Golf manual,2001 Polo 1.4 16V manual [now sold], '09 2.0CR TDI Tiguan manual,
    Numerous Mk1 Golf diesels

  6. #6
    Join Date
    Feb 2008
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    Adelaide,Oz
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    i bought a box set combo of allen key, torx, spline bits 6-12mm from Repco, few years back. Not expensive either
    Haven't used them on head bolts though.Yet.

    Like this but generic
    https://www.repco.com.au/en/tools-eq...03k/p/A9931868
    Last edited by Rebuild; 07-04-2022 at 03:03 PM.
    Steve
    04 T5 auto 2.5L TDI

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