angelfj Posted August 20, 2009 Report Share Posted August 20, 2009 Is this a special tool? See diagram and excerpt below. Considering that I have never seen let alone own a 1/8" Unbrako hexagon wrench, I assume that this is a tool which limits the torque at which the allen screw is tightened. What can be used as an alternative and is this a safe approach? Quote Link to post Share on other sites
jerrytr5 Posted August 20, 2009 Report Share Posted August 20, 2009 I think that 'Unbrako' were just a trade name of the time - nothing more. Just use a nomal allen key wrench. Quote Link to post Share on other sites
Alec Pringle Posted August 20, 2009 Report Share Posted August 20, 2009 Hi Frank, Jerry is quite right, Unbrako were and are manufacturers of top notch fasteners, particularly known for socket heads. The allen (hex) key in question was a 'long', which means about 4" as opposed to the 2" short or 6" extra long. Hope that helps . . . but sorry, I've no idea what that equates to in torque, other than a damn good pull - Unbrako hex tools were as good as it got, you'd have to go some to bend one !!! Cheers, Alec Quote Link to post Share on other sites
angelfj Posted August 21, 2009 Author Report Share Posted August 21, 2009 Hi Frank, Jerry is quite right, Unbrako were and are manufacturers of top notch fasteners, particularly known for socket heads. The allen (hex) key in question was a 'long', which means about 4" as opposed to the 2" short or 6" extra long. Hope that helps . . . but sorry, I've no idea what that equates to in torque, other than a damn good pull - Unbrako hex tools were as good as it got, you'd have to go some to bend one !!! Cheers, Alec Thanks guys for your expert assistance! Quote Link to post Share on other sites
angelfj Posted August 21, 2009 Author Report Share Posted August 21, 2009 Is this a special tool? See diagram and excerpt below. Considering that I have never seen let alone own a 1/8" Unbrako hexagon wrench, I assume that this is a tool which limits the torque at which the allen screw is tightened. What can be used as an alternative and is this a safe approach? Just got this clamping arrangement apart this morning. I had to escape the heat and humidity for a while as it's about 85F and maybe 90% rh. You may want to make a notation in your workshop manuals because the 1/8-inch hex is actually a 3/16-inch hex (at least on my TR250). Can someone measure and concur, please. Quote Link to post Share on other sites
harrytr5 Posted August 22, 2009 Report Share Posted August 22, 2009 Just got this clamping arrangement apart this morning. I had to escape the heat and humidity for a while as it's about 85F and maybe 90% rh. You may want to make a notation in your workshop manuals because the 1/8-inch hex is actually a 3/16-inch hex (at least on my TR250). Can someone measure and concur, please. Just checked Frank and you are right 3/16" Regards Harry TR5 Nutter Quote Link to post Share on other sites
angelfj Posted August 22, 2009 Author Report Share Posted August 22, 2009 Just checked Frank and you are right 3/16"Regards Harry TR5 Nutter Thanks Harry!!! Quote Link to post Share on other sites
Guest ntc Posted August 22, 2009 Report Share Posted August 22, 2009 Hi Frank Ensure the bottom of the stud is flat most are worn and not Quote Link to post Share on other sites
angelfj Posted August 22, 2009 Author Report Share Posted August 22, 2009 Hi FrankEnsure the bottom of the stud is flat most are worn and not can you explain why this is important? thanks Quote Link to post Share on other sites
Guest ntc Posted August 22, 2009 Report Share Posted August 22, 2009 can you explain why this is important? thanks Frank It is std practice to renew the whole clamp if the stud is slightly rounded you will get play on the steering wheel and bare in mind it is designed to collapse ie slide in a collision Quote Link to post Share on other sites
angelfj Posted August 23, 2009 Author Report Share Posted August 23, 2009 FrankIt is std practice to renew the whole clamp if the stud is slightly rounded you will get play on the steering wheel and bare in mind it is designed to collapse ie slide in a collision OK thanks. That sure makes sense. Quote Link to post Share on other sites
angelfj Posted September 3, 2009 Author Report Share Posted September 3, 2009 (edited) "Frank It is std practice to renew the whole clamp if the stud is slightly rounded you will get play on the steering wheel and bare in mind it is designed to collapse ie slide in a collision" First a comment: I agree. This would be the logical thing to do. However, the clamps are no longer manufactured and a quick check of the major suppliers shows NLA! I was offered a good used one by Revingtons, but what's the point. So, I have decided to re-use what I have but I first did a thorough examination for cracks, bad threads, etc. I will fit a new grub screw and lock nut also. Now, an UPDATE!!! I reported previously, that I could not find torque values for the safety clamp bolts and grub screw in my Haynes manual. It seemed to me that this was critical. However, after further research: The Robert Bentley TR250/TR6 shop manual states the following: " . . . .tighten both pinch bolt and the two bolts securing the safety clamp - torque 6 to 9 lb-ft." " . . . .tighten the grub screw - torque 18 to 20 lb-ft and tighten the lock nut." Edited September 3, 2009 by angelfj Quote Link to post Share on other sites
Guest ntc Posted September 3, 2009 Report Share Posted September 3, 2009 (edited) And a reply to you got two new one's last month Edited September 3, 2009 by ntc Quote Link to post Share on other sites
angelfj Posted September 3, 2009 Author Report Share Posted September 3, 2009 And a reply to you got two new one's last month who supplied them pray tell? Quote Link to post Share on other sites
Guest ntc Posted September 3, 2009 Report Share Posted September 3, 2009 (edited) " . . . .tighten both pinch bolt and the two bolts securing the safety clamp - torque 6 to 9 lb-ft." " . . . .tighten the grub screw - torque 18 to 20 lb-ft and tighten the lock nut." Frank That is the correct sequence I will Pm you later but having problems with email's etc just now Edited September 3, 2009 by ntc Quote Link to post Share on other sites
Jersey Royal Posted September 3, 2009 Report Share Posted September 3, 2009 And a reply to you got two new one's last month Hi Neil, Spill the Beans........ You know you want tooooo Cheers Guy Quote Link to post Share on other sites
Guest ntc Posted September 3, 2009 Report Share Posted September 3, 2009 Hi Neil, Spill the Beans........ You know you want tooooo Cheers Guy Not here Guy and still having problems with email 1 in 30 coming though bad for business Quote Link to post Share on other sites
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