johny Posted December 19, 2022 Report Share Posted December 19, 2022 How did you sort out the laygear end float in the end? Link to comment Share on other sites More sharing options...
DanielH Posted December 20, 2022 Author Report Share Posted December 20, 2022 Morning, I removed material from the backside of the washers. Link to comment Share on other sites More sharing options...
68vitesse Posted December 20, 2022 Report Share Posted December 20, 2022 Is this a large tip on main shaft gearbox?, if so mine had a couple of spacers for the bearing. Don't know if it is standard as my three rail box, reverse by first, has a fine spline input shaft. Regards Paul Link to comment Share on other sites More sharing options...
DanielH Posted December 20, 2022 Author Report Share Posted December 20, 2022 Hi guys... I believe I have a problem... I have a fairly big gap between 1st gear (the big one) and its synchro unit. The 1st gear sits on split colars, which might fall out of their recession on the mainshaft. I am sure that they were sitting properly when my mainshaft was on the workbench. The brake ring travels free between the gear and the sync unit. I see no way to adjust the gap. A user in a different forum turned the synchro unit upside down, which I cannot do right now because the rear bearing is half way in... Whats the problem with the gap: if the gap is too large then the balls of the synchro unit might be exposed. Also I guess it's going to feel strange at the lever... What are you saying? BTW: I never drove a GT6 so I don't know about the quirks! In situ: On the bench: Link to comment Share on other sites More sharing options...
Josef Posted December 20, 2022 Report Share Posted December 20, 2022 Did you take the 1/2 shift unit completely apart? The central bit of it is not symmetric so there is a chance you have it in the wrong way around. Though do remember the whole shift unit needs to move on the mainshaft, this movement is what pushes the synchro ring against the gear cone. Can you actually engage 1st gear? Link to comment Share on other sites More sharing options...
Pete Lewis Posted December 20, 2022 Report Share Posted December 20, 2022 it is so easy the collets pop out as you strike the rear bearing inplace and assy the mainshaft into the case i always do this with shaft and case six pairs of hands and sit the mainshaft in a lump of wood in a vice (with blind hole to locate the spigot) and drop the shaft and case vertically then gravity stops the collet thrusts from jumping out some wire up the assy to keep it together ive not found that works well . when its all in place you can drift the new bearing down the shaft and into the case Pete Link to comment Share on other sites More sharing options...
DanielH Posted December 20, 2022 Author Report Share Posted December 20, 2022 When I remove all slack then probably 30-40% of the balls appear. (over the course of fiddling I lost the balls abviously, I am going to introduce them later again) Link to comment Share on other sites More sharing options...
DanielH Posted December 20, 2022 Author Report Share Posted December 20, 2022 Quote Did you take the 1/2 shift unit completely apart? Josef, good point!! I did, and the longer sleeve points towards the first gear. The short slleve points to the input side... These fotos are pre-disassembly, but I am sure that I re-assembled it accordingly. Link to comment Share on other sites More sharing options...
DanielH Posted December 20, 2022 Author Report Share Posted December 20, 2022 Ok, can I link threads of the other forum here? https://www.triumphexp.com/forum/spitfire-and-gt6-forum.8/assembly-of-synchro-hub.832441/ Quote The face with the greater recess should be on the side with the gear teeth. While it is possible to reverse this assembly, when you selected 1st gear the balls and springs would pop out because the greater recess towards 1st gear would allow the outer hub to slide too far. Like this: Awesome! Link to comment Share on other sites More sharing options...
DanielH Posted December 20, 2022 Author Report Share Posted December 20, 2022 It's much better now: Thank you all! You prevented me from a big mistake!! Link to comment Share on other sites More sharing options...
johny Posted December 20, 2022 Report Share Posted December 20, 2022 4 hours ago, 68vitesse said: Is this a large tip on main shaft gearbox?, if so mine had a couple of spacers for the bearing. Don't know if it is standard as my three rail box, reverse by first, has a fine spline input shaft. Regards Paul Yes your box must be non standard as no GT6/Vitesse was ever supplied with a large tip or fine splines... Link to comment Share on other sites More sharing options...
DanielH Posted December 20, 2022 Author Report Share Posted December 20, 2022 I am not able to get my roller bearing main shaft -> input shaft installed. Was there a difference between the versions (remember: I've got the wrong i.e. earlier repair set for my later gbox)?? Link to comment Share on other sites More sharing options...
DanielH Posted December 20, 2022 Author Report Share Posted December 20, 2022 Somebody has got the diameter of the main shaft tip at hand? thx Link to comment Share on other sites More sharing options...
DanielH Posted December 20, 2022 Author Report Share Posted December 20, 2022 Old needle bearing (left), new one (right). If I start pressing the input shaft (with bearing) into the gearbox and the mainshaft tip penetrates (sorry) the input shaft, a friction is building up, which prevents turing the mainshaft in the input shaft. WTF Link to comment Share on other sites More sharing options...
DanielH Posted December 20, 2022 Author Report Share Posted December 20, 2022 Apparently the inner dia of the bore in the input shaft decreases with depth. My new mainshaft tip is all cylindrical: the needle bearing seazes on the shaft. Link to comment Share on other sites More sharing options...
Josef Posted December 20, 2022 Report Share Posted December 20, 2022 I don’t have the measurements to hand, but the inside of the input shaft should definitely be cylindrical. I do have some worn mainshafts kicking around, I shall try and find them and see if there is an unworn bit of the tip to measure for you. The bearing you’ll need / should have is 144782, the GT6 and late three rail Spit all had this one bearing so there is not a different sized one available (as standard). Link to comment Share on other sites More sharing options...
DanielH Posted December 20, 2022 Author Report Share Posted December 20, 2022 Oh wow, the input shaft might come from another car, like 6cyl Herald, Vitesse?? Do these have conical bores? Link to comment Share on other sites More sharing options...
Josef Posted December 20, 2022 Report Share Posted December 20, 2022 No, they all should be cylindrical! Earlier Herald/Spitfire (and maybe Vitesse) ones have a different style of bearing that’s a different size, but still nothing tapered (and the gears probably wouldn’t mesh with a Gt6 gearset even if someone had managed to fit one). Link to comment Share on other sites More sharing options...
Josef Posted December 20, 2022 Report Share Posted December 20, 2022 Can’t remember where my old main shafts are I’m afraid. Link to comment Share on other sites More sharing options...
JumpingFrog Posted December 20, 2022 Report Share Posted December 20, 2022 1 hour ago, DanielH said: Somebody has got the diameter of the main shaft tip at hand? thx 0.5" nominal, but I suspect it should be slightly less for running clearance of the bearing but this isn't specified in the manual. 1 hour ago, DanielH said: Apparently the inner dia of the bore in the input shaft decreases with depth. My new mainshaft tip is all cylindrical: the needle bearing seazes on the shaft. Is it a new shaft? Or has it been repaired? There was a report here about a new shaft from Bastuck being oversize causing one of the gear bushes to seize. I had similar troubles with the spigot on a newly manufactured shaft (from a well-known specialist) that I was told had swelled in heat treatment, the specialist took it back and ground it to the correct size and everything was fine after that. Link to comment Share on other sites More sharing options...
Pete Lewis Posted December 20, 2022 Report Share Posted December 20, 2022 the spigot is 0.5" on all i have used dont know the tolerance on that . the input shaft has a drilled bore this is ground to the spec size so there will be a step down the bottom of the bore any idea the bore decreases ( you think a taper ) would be a bit nuts Pete Link to comment Share on other sites More sharing options...
johny Posted December 20, 2022 Report Share Posted December 20, 2022 Yes the bearing is 1/2*3/4 and I believe was used on all models until the change to single rail. I think you need to check both shaft tip and input shaft hole sizes as one or both could have been modified.... Link to comment Share on other sites More sharing options...
68vitesse Posted December 20, 2022 Report Share Posted December 20, 2022 Does this help. Regards Paul. 1 Link to comment Share on other sites More sharing options...
68vitesse Posted December 20, 2022 Report Share Posted December 20, 2022 4 hours ago, johny said: Yes your box must be non standard as no GT6/Vitesse was ever supplied with a large tip or fine splines... I was referring to the spacers not he box itself which is three rail, large tip and J type overdrive. Put together by ? as a combination of later parts, came to me with a failed Vitesse restoration bought for the parts. Regards Paul. Link to comment Share on other sites More sharing options...
johny Posted December 20, 2022 Report Share Posted December 20, 2022 3 minutes ago, 68vitesse said: I was referring to the spacers not he box itself which is three rail, large tip and J type overdrive. Put together by ? as a combination of later parts, came to me with a failed Vitesse restoration bought for the parts. Regards Paul. Think spacers were only ever used on large tip mainshafts and not the original 1/2" type.... Link to comment Share on other sites More sharing options...
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