4 replies to this topic

[sjm44]

I have the 4 syncro transmission out on my 78 Austin Mini and it appears that the detent is not working in reverse gear. Secondly, when using the gear selector shaft to get it in reverse, it only goes over about half of the tooth width on the gear (linkage/levers worn?). It moves quite freely and I can push it over all the way to fully engage but there does not feel like there is any kind of detent to keep it there. I know there is a detent ball and spring in the side of the differential and is for 1st thru 4th gears. Is this also for reverse? In the Hayne's Restoration manual, page 63, ilistration DL71, it refers to a detent plunger for reverse gear. I am not quite sure where this is. Can anyone forward me to a better picture and explanation or offer any advice.

Thanks

Steve

[Nightrain]

Under the O/S diff side cover.

[Dan]

In your gearbox there is only one detant set for the whole selector mechanism. The seperate detant plunger for reverse was used in older remote change and magic wand type gearboxes. Selector forks can tend to splay out and so become less accurate. If that is the case the detant won't be able to hold it in place anyway.

[sjm44]

Thanks for the response, after much studying and simulated shifting, and looking at the picture in the restoration book I did determine that they were working on an older maybe 3 speed transmission. Will pull off the differential housing tomorrow and side plate to see what the fork and detent mechanism looks like. Time now for a couple of beers before dinner.

Thanks again

Just finished restoration of a 1953 Singer 4AD earlier this summer. Been having fun driving it, finally.

Steve

[Guess-Works.com]

Being a 78, it'll be a 4 sychro rod change, on which the reverse gear does not have a detent as such, other than the one mentioned above which creates the H pattern...

If the gear is not locating properly, it's more likely to be the reverse idler bush ( normally it exist the other end of the gear but could prevent the idler from locating fully )

Only way to actually SEE what is going on is the removal of the box from the engine... you'll not see it well enough through the diff...