06-10-2020, 03:54 AM
Thanks for the replies Chris and Bob. The gearbox in question was last used by me in the late 60's and seemed to work Ok without any memorable nasty issues. I have replaced the layshaft bushes which were badly worn and re-staked the syncro cone on 4th gear which had come loose. I will replace both the mainshaft bearings as well because they were badly worn.
The 2nd/3rd syncro hub had a full complement of balls and springs but the second gear syncro was missing 4 balls and some springs.
I will replace these and try a new alignment of the balls on unworn splines which should then be as there were when first manufactured. I take note that Chris has issues when he did this with 1st gear being notchy/baulky to engage. Worth a try I think.
I will also take note of the mainshaft position and reduce any free movement between the selector and syncro hub as Bob suggests. I can see that any excessive movement here will allow the syncro hub to move too far and risk the balls being released into the bowels of the box.
Happy to hear of any other recommendations from people with similar experience and fixes.
Many thanks to all
Bruce
The 2nd/3rd syncro hub had a full complement of balls and springs but the second gear syncro was missing 4 balls and some springs.
I will replace these and try a new alignment of the balls on unworn splines which should then be as there were when first manufactured. I take note that Chris has issues when he did this with 1st gear being notchy/baulky to engage. Worth a try I think.
I will also take note of the mainshaft position and reduce any free movement between the selector and syncro hub as Bob suggests. I can see that any excessive movement here will allow the syncro hub to move too far and risk the balls being released into the bowels of the box.
Happy to hear of any other recommendations from people with similar experience and fixes.
Many thanks to all
Bruce