Gearbox specialist? Preferably in the South East

[bakerlonglegs]

T&L Engineering have started thinking about my engine rebuild, but have said that gearboxes aren't really their thing. 

As I bought this project already in bits, I don't know what state the gearbox is in.  I've never stripped a gearbox before, so I'm not sure what to look for and what specialist tools I may need.  Does anyone know of a gearbox guru who could strip and check the gearbox?  I'm trying to locate suppliers and specialists in the South East, as I prefer delivering and collecting stuff by hand and having a good old chin-wag about what's needed.   The gearbox is currently in one piece (unlike everything else on this project!    ).

Ta!

[duTch]

 Hiya Legs, the gearboxes are a piece of cake, I can do it so it must be true...there's plenty of help and potential gurus here.

 Can't recall if yours is a Plunger or Swing Arm, but apart from different shift mechanism in the outer cover much all the same.

 Not many tools involved, a 3/16" WW (preferably thin wall) ring or socket for the four main nuts, and a screw driver for the outer cover screws, and a smaller one for the selector shaft grub screw.
 when pulling the outer cover, you'll need to leave the kick lever on, and depress it away from its' stop, and then let it return onto the clutch arm..
 Actually, and in response to a question that was asked awhile ago that I may have failed to answer, the outer and inner covers can be removed together- with the mainshaft, a bit messy, but can be done- I did it the other day accidentally, as I have in the past, but it's actually pointless, because it's really not easy/possible to reassemble it without separating them anyway.
 
    aaaah may have got carried away, but they are easy as...much easier with good tongue lube

 There's only a couple or so of minor important things to address, but help is just a few buttons away, just holla and take progressive photos, so you know what went where, because sometimes what went where should've went somewhere else..!!!

[bsa-bill]

Totally agree with duTch

it's a pretty rugged but simple thing inside, yes first thing is disconnect the clutch cable, move the clutch arm outward so it is 180 degrees from normal this will prevent the kickstart lever from unwinding.
Main things to look for - kickstart pinon and ratchet for wear, same for bushes, and end of layshaft.
apart from the cogs, I think just about everything is available including layshaft and mainshaft.
Plenty help here to keep you right, possible the mainshaft sliding gear bush if it needs replaced would be a canidate for any engineering shop to do (your engine shop should be more than capable), same for the layshaft end if you want to use the same one any shop will tidy up the worn end and make a bush to fit

your choice bakerlonglegs we are here tho for any queries you may have

[Johnny J]

Sorry if I push in a questions here, if the the mainshaft bush (in pic) is worn and there is play here, does that mean that the ball bearings inside are also no good?

[duTch]

 johnny- Not necessarily, but maybe....they aren't really directly related, kind of second cousins once removed... as my dear old Ma used to say...

  I think there should only be a couple of thou tolerance there, someone will be more definitive, but I think we can get away with a bit more under duress...well I'm pushing the boundary anyway....

  but if you think about it, the more play there is there, the more chance of oil leaking, and the clutch will be out of whack (eccentric), and also the seal(more ) in the back of the chaincase will potentially flog out, and the primary chain will be constantly different tension/slackness ... . dunno really.. ...

[bakerlonglegs]

Thanks very much for the advice and encouragement!   

Alrighty then, I'll have a go at it myself, will take plenty of step-by-step pictures and report back..... 

[Butch (cb)]

On the original question, not sure what bit of the South East you are in but Roger at Cake Street is Suffolk. Not so much a g/box specialist but pretty much A7/10 focussed.

[bikerbob]

To Johnny J  if you have play there on your mainshaft then there is a good chance that the high gear bushes are worn and that is a probable cause of an oil leak.  For me they are the most difficult things to replace in the gearbox everything else is really straight forward.