trolleybus Posted December 9, 2019 Report Share Posted December 9, 2019 Hello All, Does anyone have the dimension or know where I might get the figure for the pinion height or fore/aft position on a 3.7:1 TR6 differential. The figure is not in the workshop manual and just refers to using the special setting tool. I've done the usual searches and just found a lot of noise on the subject. I would really like a number and or a reference/link where to find it Pleezze. Cheers, Quote Link to post Share on other sites
ed_h Posted December 9, 2019 Report Share Posted December 9, 2019 Check out this link: http://www.74tr6.com/pdfs/Differential.pdf Ed Quote Link to post Share on other sites
trolleybus Posted December 9, 2019 Author Report Share Posted December 9, 2019 (edited) On 12/9/2019 at 11:48 AM, ed_h said: Check out this link: http://www.74tr6.com/pdfs/Differential.pdf Ed Thanks Ed, I found it while ago and read it at length, I would not call it a succinct piece of writing, really can't see where he gives the actual concise length. However with a re reading, I found the measurement, But would like to have a confirmation from another source. Cheers, Edited December 10, 2019 by trolleybus Quote Link to post Share on other sites
Z320 Posted December 9, 2019 Report Share Posted December 9, 2019 (edited) Issue: "gearbox, prop shaft, differential", or "rear axle, differential, drive shafts", no special model, not only TR6 had that only 7 months ago at "general technic", with a different article sadly lost there in the "big heap" Later I discussed this with a friend, he made several diffs. He told me this dimension is originally writen on the top of the pinion. I don't know if it is true.... Ciao, Marco Edited December 9, 2019 by Z320 Quote Link to post Share on other sites
BlueTR3A-5EKT Posted December 9, 2019 Report Share Posted December 9, 2019 12 hours ago, Z320 said: Issue: "gearbox, prop shaft, differential", or "rear axle, differential, drive shafts", no special model, not only TR6 had that only 7 months ago at "general technic", with a different article sadly lost there in the "big heap" Later I discussed this with a friend, he made several diffs. He told me this dimension is originally writen on the top of the pinion. I don't know if it is true.... Ciao, Marco The dimension given on the top of the original TR6 pinion head that I have seen was -3, -2, -1, N +1, +2, +3. Also etched on the pinion head was a number that matched it to its paired crown wheel. The dimension is from the standard setting (N) in thousandths of an inch. So if you have an ORIGINAL factory diff that is fitted with a pinion having -1 on the pinion head you should replace with the same or 0.001" adjustment to pinion height will be required to get back to original setting. The TR6 diff has an adjusting washer between the head of the pinion and the big pinion bearing, which sets the pinion height. This adjusting washer must be installed with a new pinion or the height will be all to cock. The sizes and part numbers of these adjusting washer I think is only given in the Triumph Parts Technical Information sheets, not the parts books. The rigid axle TR2/3/4 as far as I have found do not use this adjusting washer. In these the pinion height is set by shims between casing and big pinion bearing outer race. I have no idea about modern replacement CW&P sets. Cheers Peter W Quote Link to post Share on other sites
Colin Fairhurst Posted December 9, 2019 Report Share Posted December 9, 2019 The Moss parts list shows that the part numbers for the TR6 Crown Wheel & Pinion and the Diff. bearings are the same as those for the TR2 & TR3 with the 3.7:1 ratio. Does Logic say that the setting up dimensions are also the same ? Regards Colin Quote Link to post Share on other sites
trolleybus Posted December 10, 2019 Author Report Share Posted December 10, 2019 I think that a reasonable hypothesis in this case, Colin. Quote Link to post Share on other sites
Z320 Posted December 10, 2019 Report Share Posted December 10, 2019 Hi Peter, thanks for that answer, but this gives me more questions. Allow me to ask them todays evening on my thread, not because it is my thread but because it is listed at "general technic" and not related to any special model. Ciao, Marco Quote Link to post Share on other sites
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