(11-12-2018, 07:59 PM)jansens Wrote: I put mine in the oven at 100C and it all came apart pretty easily. A heat gun used carefully works too. One trick it embarrassingly took me a few minutes to discover is that to get the main shaft out you need to push some of the gears fully back on the shaft so they will clear the lip at the top of the box.
I am changing mine over to closer ratio gears and am just about to reassemble it all after having replaced the gears and all the synchro balls and springs. The hole in the tin can method for replacing the synchro balls works well.
Simon
+1 for a low oven, safer than local heating.
Simon, I don't know if it's any help to you but I wrote up my Swiss adventure in A7CA mag 1997D. The gist of it was to eliminate wear in the bearings, synchro cones and selector balls and springs as far as you are able then arrange for about 15 thou of end float in the shaft by shimming. Take care with the circlips on the bearings as you may need to transfer them to any new bearings you fit. The box in my Ulster continued to give good service for the next 20 years and was still going well when I opted to try a crash box last year. It was rather stiff when first rebuilt, which I attributed rightly or wrongly to failing to fit the selector rings in the same orientation.