RogerH Posted October 28, 2016 Report Share Posted October 28, 2016 Hi Folks, as mentioned by Bob in an earlier post; it should reasonably easy to test a torque wrench. Hold the square drive in a vice. Attach a rope to the centre of the handle and let it hang down (orientate the wrench to allow this). Attach various weights to the end of the rope. Assuming that the distance from the square drive to the rope is 12" or 1ft. then the weight should be read out on the gauge. Otherwise you will have to compensate for the length. 2ft = 1/2 the weight I can't see it being accurate for the bendy bar or a cheap spring torque spanner. But as mentioned it will be repeatable. Roger Quote Link to post Share on other sites
Waldi Posted October 28, 2016 Report Share Posted October 28, 2016 To add to the accuracy aspect: The instrument may be calibrated and all correct, but in industry it is recognized that an accuracy of +/- 30% for this method is about right. Factors influencing this are lubrication, condition of thread, harded steel washers (or not). Around 50% of the applied torque is absorbed by friction, which is accounted for in the specified torque, off course. So it is equally inportant to have studs, nuts and rings in good and in the same condition, and lubricate all contact areas with the specified lubricant. Quote Link to post Share on other sites
Motorsport Mickey Posted October 28, 2016 Report Share Posted October 28, 2016 Waldo my boy....Triumph torques are all specified dry unless you replace head studs or others with specialist fastenings that have lubrication allowed for in their fitting, ARP for example. Mick Richards Quote Link to post Share on other sites
Waldi Posted October 28, 2016 Report Share Posted October 28, 2016 Mick, thanks, i was not aware of this. My post applies to general bolttorquing, sorry for not expressing myself clear. Interesting the nuts/studs shall not be lubricated on a tr4 head stud. And my name is Waldi:) Quote Link to post Share on other sites
stillp Posted October 28, 2016 Report Share Posted October 28, 2016 He's still right - the specified lubricant is: none. Pete Quote Link to post Share on other sites
peejay4A Posted October 28, 2016 Report Share Posted October 28, 2016 +30% on a TR head = stripped threads. -30% on a TR head = blown head gasket pronto. Quote Link to post Share on other sites
Guest ntc Posted October 28, 2016 Report Share Posted October 28, 2016 With a quality wrench if you release it to 0 after use it will last for years. Quote Link to post Share on other sites
graeme Posted October 28, 2016 Report Share Posted October 28, 2016 Just to add, I have a Norbar wrench which is 45 years old, always returned to zero after use and has never been out when it is checked. Cheers Graeme Quote Link to post Share on other sites
Alec Pringle Posted October 29, 2016 Report Share Posted October 29, 2016 Agreed, a decent torque wrench properly treated should last for years. As mine have. That is not a good reason to take them for granted. Which is why we check them. It's a damn sight cheaper to do that than to rebuild an engine . . . . . again . . . . . Cheers Alec Quote Link to post Share on other sites
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