PaulR Posted February 9, 2014 Report Share Posted February 9, 2014 2-3 years ago I had a problem with my 64 TR4 jumping out of second gear when not under load. After reading the forum and dismantling the Gbox I found the second gear 'Top Hat' bush was sheared. This was duly replaced and all was well with the world. Until recently. Same problem has re-occured. Just had the box out and low and behold 'Top Hat' bush has sheared again. Now thinking that sheared bush was effect rather than cause. All the rest of the innards appear fine, no missing teeth or wear marks. However the rear gearbox mount has done its usual trick and disintegrated, could this be the cause? Anyone got any suggestions what I should check before replacing the bush and refitting Also whats the answer to the gbox mount, this will be the 3rd one since I 've had the car Thanks in advance Paul Quote Link to post Share on other sites
BlueTR3A-5EKT Posted February 9, 2014 Report Share Posted February 9, 2014 Fit the two piece top hat bush in second gear from the Stag? 153237 + 153239 Peter W Quote Link to post Share on other sites
MichaelH Posted February 9, 2014 Report Share Posted February 9, 2014 Isn't there a steel version of the bush available? which of course is much stronger than the brass version Michael Quote Link to post Share on other sites
Geko Posted February 9, 2014 Report Share Posted February 9, 2014 (edited) re g-box mount, I would first check if the engine and dif mounts are ok. I have fitted 2 Land Rover engine mounts which have a larger plate hence providing better dampening. Edited February 9, 2014 by Geko Quote Link to post Share on other sites
graeme Posted February 9, 2014 Report Share Posted February 9, 2014 (edited) The steel version is used on the later gearbox('73, metric?). I am not sure if you can retro fit to the early box. Did you check the endfloat after fitting the top hat? Details here: http://www.buckeyetriumphs.org/technical/Gearbox/GearboxOverhaul1/GearboxOverhaul1.htm Cheers Graeme Edited February 9, 2014 by graeme Quote Link to post Share on other sites
AlanT Posted February 9, 2014 Report Share Posted February 9, 2014 My guess is the spigot/bush between the input shaft and main-shaft. Wear here allows the input shaft to run out of line with the layshaft. Quote Link to post Share on other sites
MichaelH Posted February 10, 2014 Report Share Posted February 10, 2014 On the point of rear gearbox mounting, the later gearboxes are longer (because they have a thicker front edge), Putting an engine and late gearbox into a TR4 shows that the gearbox mounts holes and the rear chassis mounts do not line up and the chassis mount holes have to be elongated to accomadate the longer box. If this is not done the front engine mounts and the rear gearbox mounts will be under constant tension and will fail. Mind you I dont see why this should stress the 2nd gear bearings. I think this is caused by inadequate oil feed to the mainshaft/ bearing surface which will eventually cause the mainshaft to "weld" itself by friction to the bearing ...and cause the breakage.. at least that happened to my box. Michael Quote Link to post Share on other sites
PaulR Posted February 10, 2014 Author Report Share Posted February 10, 2014 Thanks all for the prompt responses especially Graeme's link which I will pour over tonight Rgds Paul Quote Link to post Share on other sites
AlanT Posted February 10, 2014 Report Share Posted February 10, 2014 You may also like this: http://www.vtr.org/maintain-index.shtml Quote Link to post Share on other sites
PaulR Posted February 28, 2014 Author Report Share Posted February 28, 2014 In case anyone experiences the same problems it was all due to end float. None between 2nd & 3rd bushes and loads on the 1st gear bush At least thats what I hope as haven't driven her yet Quote Link to post Share on other sites
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