PhilExe Posted January 17, 2020 Report Share Posted January 17, 2020 I am undertaking a rebuild of a TR4 gearbox including new main shorter shaft to accept an overdrive. I have completed all the stripping and re-assembly of the lay shaft and main shaft, new main shaft, lay shaft all bearings, bushes and thrust washers measured and replaced as required. The gears are all in good condition as is the casing. Upon re-assembly it all goes together into the casing the shafts seem to mate ok but they wont turn together. If installed separately they turn fine but as soon as I put them in together they just lock up. I can't help thinking I'm missing something simple and obvious but can see what. Any suggestions would be appreciated. Thanks in anticipation Phil Quote Link to post Share on other sites
ctc77965o Posted January 17, 2020 Report Share Posted January 17, 2020 Do you have gears selected? If you select two gears at one time (eg 1st & reverse) the box is locked solid Quote Link to post Share on other sites
Chilliman Posted January 17, 2020 Report Share Posted January 17, 2020 Phil, it's not clear if you're using a new layshaft or just re-bushed the original, if it's a new one, is it a matched gear set? I.e. there are two different types -16 teeth & 17 teeth versions which would stop them rotating if the wrong one Quote Link to post Share on other sites
signalredshaker Posted January 17, 2020 Report Share Posted January 17, 2020 It may be you have the layshaft gears in the wrong way around. It can be done!! James Quote Link to post Share on other sites
PhilExe Posted January 17, 2020 Author Report Share Posted January 17, 2020 John, I am using a new lay shaft it came with the rebuilt kit. The shaft itself is just a plain steel bar, the gears are all the original ones. Thanks for all the comments. Phil Quote Link to post Share on other sites
Chilliman Posted January 17, 2020 Report Share Posted January 17, 2020 Sorry Phil, I commonly (& wrongly) refer to the lay shaft meaning the lay gear....must be an age thing! - I've built several boxes & overdrives in the last few years so happy to take a look in case it is something obvious...? Quote Link to post Share on other sites
SeidelVC69 Posted January 18, 2020 Report Share Posted January 18, 2020 Is there one of the synchro rings sticked to a gear ? Dieter Quote Link to post Share on other sites
PhilExe Posted January 18, 2020 Author Report Share Posted January 18, 2020 John, Many thanks. I'll take you up on your offer please. I should be coming to North Devon the week after next on a week day. Can you let me know where you are. Email: phil.board@gmail.com Phil Quote Link to post Share on other sites
Chilliman Posted January 18, 2020 Report Share Posted January 18, 2020 Hi Phil, email sent.... Quote Link to post Share on other sites
graeme Posted January 19, 2020 Report Share Posted January 19, 2020 Phil, Can you select all the gears OK? Ensure the reverse gear is not engaged at the same time as any other gear. If I remember correctly, it is possible to install the reverse gear the wrong way round which would lock the lay gears. Graeme Quote Link to post Share on other sites
ianc Posted January 19, 2020 Report Share Posted January 19, 2020 PhilExe - a word of advice: I suggest you edit your post to remove your email address as it's not a good idea to have it visible to everyone because there are always a few pests about. Better to use a PM (Personal Message) in future. Ian Cornish Quote Link to post Share on other sites
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