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  1. #1
    Join Date
    Dec 2019
    Location
    amersham
    Posts
    62

    Seat belt anchorage

    Continuing with my AK build i started to look at the lower seat belt anchorage points, i purchased some 7/16 UNF eye bolts and it looks as though they screw into the existing tapped holes in the chassis,now i presume that they do need to be eye bolts as when you look at seat belts/safety harness connections they generally show a spring type catch arrangement which attaches to the eye bolt, is this the correct interpretation.

  2. #2
    Join Date
    Mar 2008
    Location
    Coventry
    Posts
    2,328
    The harnesses bolt flat to the chassis with normal bolts, you need eyed for the top mounts.

    Paul
    AK, on the road Oct 2012

  3. #3
    Join Date
    Dec 2019
    Location
    amersham
    Posts
    62
    Paul
    Thats how i thought it might be ,but when you look at modern safety harnesses for instance in Merlin motor sport the harness end connections are all spring type catch arrangements.
    Confusing ! Also the tapped hole in the chassis lays back from the fibre glass foot well by about 7 mm which means that when you tighten the bolt whether its an eye bolt or just a plain bolt the fibre glass will crack unless spacer washers are added, not the best design for a safety relevant part.

  4. #4
    Join Date
    Apr 2005
    Location
    Worcestershire
    Age
    45
    Posts
    2,305
    These are the type of harness you need, as Paul says, eye bolt at the top, bolts at the hips.

    https://www.merlinmotorsport.co.uk/p...4w?pn=SS3X4B-W
    Regards

    Craig Perry

    No, I'm not "repairing" it, I'm fine tuning its performance.

  5. #5
    Join Date
    Mar 2008
    Location
    Coventry
    Posts
    2,328
    Quote Originally Posted by methoni View Post
    Paul
    Thats how i thought it might be ,but when you look at modern safety harnesses for instance in Merlin motor sport the harness end connections are all spring type catch arrangements.
    Confusing ! Also the tapped hole in the chassis lays back from the fibre glass foot well by about 7 mm which means that when you tighten the bolt whether its an eye bolt or just a plain bolt the fibre glass will crack unless spacer washers are added, not the best design for a safety relevant part.
    My body when fitted was quite tight to the fixing holes, once the fibreglass was removed over the fixing hole a large washer was enough to allow the bolt to tighten up with no issues

    Paul
    AK, on the road Oct 2012

  6. #6
    Join Date
    Nov 2012
    Location
    Lanarks
    Age
    63
    Posts
    258
    Eyebolts top and bottom on mine

    I think IVA chap would like to see the swinging brackets with the catch need clearance and not foul on the seat or headrest




  7. #7
    Join Date
    Dec 2013
    Location
    Newark, Notts
    Age
    69
    Posts
    1,535
    When I fixed my lower bolts I made a spacer which went through the fibreglass and then sat flat on the chassis. This got over the flexing off the fibreglass
    Charlie

    Quote Originally Posted by methoni View Post
    Paul
    Thats how i thought it might be ,but when you look at modern safety harnesses for instance in Merlin motor sport the harness end connections are all spring type catch arrangements.
    Confusing ! Also the tapped hole in the chassis lays back from the fibre glass foot well by about 7 mm which means that when you tighten the bolt whether its an eye bolt or just a plain bolt the fibre glass will crack unless spacer washers are added, not the best design for a safety relevant part.
    Joint Area Rep - East Midlands Region
    AKCharlie - ''AKA SOOTY'' - AK GEN2 - LS3 - 6.2litre - 434bhp - A dream come true
    .

  8. #8
    Join Date
    Dec 2019
    Location
    amersham
    Posts
    62
    Yes
    I have come to the same conclusion,make up a spacer or use washers to bridge the gap, and having spoken to Merlin motor sport ordinary grade 8.8 hex bolts are the way to fix the lower belt to chassis anchorage points.
    Regards

  9. #9
    Join Date
    Apr 2014
    Location
    Stourport on Severn
    Age
    61
    Posts
    256
    Did mine similar to Charlie.
    Used a lock nut and wavy washer to allow a bit of rotation on the belt Anchorage.
    The locknut acts as a spacer.

    43F3FF49-A002-45A6-9F71-E8E758DBA0BD.jpeg
    Cheers
    Steve

    My missus asked me to build her a Cobra! – How good is that!

    AK Gen2 chassis arrived 12/2/15 IVA Passed 2/7/18 on road 29/7/18
    http://stevesakcobrabuild.blogspot.com

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