Hi guys Pulled my gearbox the other day to replace broken third gear mainshaft pinion, and also because box jammed in first - but now having problems trying to index box, especially with that bloody leafspring on camplate! Have no idea which gear to put it in to index it, or how to tell from camplate position as to what gear it's in anyway! Leafspring makes it impossible! Any ideas as to why it jammed in bottom gear in the first place? Found the broken tooth in bottom of gear sump, selector forks and shift mechanism all seem ok. Any suggestions please? I think I'm going slightly mad...
I have never had to deal with problem, but I think I have the manual that explains how to do it on my pc at home........only problem is, I am in Spain till Sunday. If you haven't managed to find it to download or got the answer here, I will contact you and email it to you.
My manual is T140, but this manual for your model is free and will be better than Haynes manual http://www.classicbike.biz/triumph/Repair/1970s/70-Triumph-Repair-Manual-63-70.pdf
Probably very little difference between T120V and T140V gearboxes! A reputable Meriden Triumph spares specialist may be able to help, and supply any bits needed!
Not much difference but you can select your year and model here http://www.classicbike.biz/triumph/Repair/Repair.htm the gear index positions are shown in my T140 manual and I suspect they will be if in t120 manual when you down load it.
Cheers, guys - I really do appreciate your help. The problem I keep running into is that every manual I've yet seen shows the gearbox fitted with the camplate plunger and spring which comes up from underneath - mine has the stupid leaf spring thing mounted to the inside of the gearbox inner cover instead, which interferes with the camplate position as soon as I reinstall it. I'm almost annoyed! Any clues as to how to take this into account?
Ah, hang on - just noticed that the leaf spring is shown in some of the pictures in the '72 model pdf manual - could this be what I've been looking for? Will let you know! Cheers, Rich
He's been a real gent! I'm just so ignorant when it comes to this sort of thing. It's all part of my mid-life crisis, I think. Came into a few quid so decided to buy an old classic bike ('72 650 bonnie) and an old classic car ('69 mgb gt) and almost immediately regretted it! A love/hate relationship with the pair of them. Still, ultra cheap insurance and tax exempt...
Can you leave them to me in your will if it does?? ;-) I have a 58 thunderbird on my shed that wants me to do something to it desperately and I keep putting it off! I will be in the same position soon
If you weren't so far away I'd pop round and give you a hand to sort it out.......I'm weird and actually enjoy sorting old bikes. Dont give up, as once you have mastered it and can do with your eyes closed, you will develop a special bond with your bike.....and be weird like me Crispey, if you want send your 58 Thunderbird to a good home.......you're not so far away
Thanks for all your confidence, guys! Wish I shared it though! Will let you know how I get on with the noisy, shaking, leaking bloody thing...
All part of their charm My T140 is loud...but everybody seems to like the sound of it, and the vibrations can be quite nice at times....and the "weeping" oils the chain I did actually manage to get the top end oil tight 5.5K miles ago (seven months), but now weeping from front push rod cover again As I have a lathe, I have a plan in mind to improve the sealing arrangement.....but that is job for the winter...she can continue to mark her territory till then
Mine leaks from the front pushrod tube too. And the gearbox drain plug. And the oil feed on the head. And the oil filler cap. More leaks than a Welsh field....
And the zorst blows from absolutely everywhere. The front brake is criminally poor. The boyer bransden ignition cuts out from time to time for reasons best known to itself. The bike seems very low on power - I was overtaken by an asthmatic ant carrying some heavy shopping the other day...
Probably leaks from primary as well, onto sprocket (seal behind clutch)??....they often do Not telling you how to suck eggs....but I presume you are using mineral 20/50, and not synthetic oil, which will find its way out even easier. Sorted that gearbox yet?.....same applies there, make sure you use Hypoy 90 gear oil in that, as engine oil will depart quicker when hot
