Steve Robinson Posted August 12, 2002 Share Posted August 12, 2002 Am in the process of trying to fit the FIA rollbar. The bolts that fit from the top are fine, the problem is the bolt that is inserted from underneath the bulkhead, the fixing kit as supplied by Caterham doesn't contain a bolt that fits. The text says it should be 5/16 x 1", but that seems too big. Anyone know what size we need???? TIA Robbo Link to comment Share on other sites More sharing options...
Fred Posted August 12, 2002 Share Posted August 12, 2002 Steve the bolts you are looking for have a very thin head on them this is so they dont foul the top of the shock fred Link to comment Share on other sites More sharing options...
Steve Robinson Posted August 12, 2002 Author Share Posted August 12, 2002 Thanks Fred, any idea what size thread though - are they imperial or metric, as I've already had one case of Caterham build manual talking metric to be told by the helpline that it should in fact be imperial! Robbo Link to comment Share on other sites More sharing options...
Fred Posted August 12, 2002 Share Posted August 12, 2002 steve cant remember but it won't mater if you find the flat head bolts they will fit the thread this is all they are for . why do you need to know 🤔 fred Edited by - fred on 12 Aug 2002 18:24:53 Link to comment Share on other sites More sharing options...
Steve Robinson Posted August 12, 2002 Author Share Posted August 12, 2002 True enough Fred, but can't find the buggers anywhere !!!!!!!!!!! If they're not in the FIA bar fixing pack any ideas on where else they could be lurking???? Link to comment Share on other sites More sharing options...
Peter Carmichael Posted August 12, 2002 Share Posted August 12, 2002 The roll cage uses a larger dia thin head bolt, so they may have supplied these by mistake. The FIA roll bar bolts are so small that the heads hardly engage the edge of the hole. Might be worth drilling and tapping to 5/16. *thumbup*253 bhp, up and running *thumbup*New boingy bits Link to comment Share on other sites More sharing options...
Fred Posted August 12, 2002 Share Posted August 12, 2002 this might be silly but you haven't used them on the seat belt in the car just a thought car seat belt retaning bolts are very similar on tin tops fred Link to comment Share on other sites More sharing options...
Steve Robinson Posted August 12, 2002 Author Share Posted August 12, 2002 Found them!!! They were in the miscellaneous bag!!! Thanks for the flat head description, wouldn't have located them without that. Robbo Link to comment Share on other sites More sharing options...
SPW Posted August 12, 2002 Share Posted August 12, 2002 Steve, Just had exactly same problem only after finding the bolts in teh misc bag I found threads were poor in roll bar and had to be cleaned out with a tap to stop them siezing up - they are 3/8" UNF which is not a common thread these days!! Did you get an instruction leaflet on fitting the petty bar (i.e. how is it mounted in the passenger footwell) and headrest restraints? Steve Link to comment Share on other sites More sharing options...
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