Hi all..I am rebuilding an M series gearbox. The problem I am having is that there is a slight tight spot in it when the main shaft is rotated. It selects gears ok. I added more gaskets which did loosen it up but still a tight spot and now too much play in the selector arm. The Main and layshafts look straight. I am thinking perhaps re-bushing everything, might fit the issue but the bushes look ok to me. As well does anyone know where I can get hold of some new gear selector dogs as the ones in the box are worn.
I have just finished rebuilding an M20 gearbox from most NOS part,
Including the shafts and a NOS dogs.
I found NOS dogs on eBay. they do come up from time to time.
My gearbox also came out a bit tight, mostly in one spot, (But I could turn it over manually)
And I thought I might have bent it, as I used some real force and heat to fit few of the new gears to the shaft.
I have also asked here, and the reply was that tight gears boxes eventually seizes,
But as I had no choice, I topped it with oil and installed it.
It shifts fine and all looks great.
So far I have done over 250Km on it and all is fine.
My logic is that the more it is used, the less is the probability for seizing,
So I hope it will do fine,
But basically the gearbox should be very free to turn.