[Healeys] Separation of Overdrive from gearbox - long response

healeyguy at aol.com healeyguy at aol.com
Wed May 21 18:52:55 MDT 2008


Ken
I dismantled three old BJ8 gear boxes with OD in February.? Two had know problems with non-functioning OD units prior to disassembly. The third unit, I had no history on.? Number three came apart as it should, spring pressure started to open the joint as the nuts on the long studs were released. A little tug on the OD unit and it came off. The other two were, shall we say, a nightmare.? A bad dream that I had not?had since my early Healey days decades ago. 

Both units had destroyed the unidirectional clutch?parts and that?that wreaked havoc on the end of the gearbox mainshaft spline. The gearbox / OD joint would open about a 1/2 inch and not budge beyond. One OD I was able to dismantle while still attached to the gearbox by starting at the rear of the OD and?remove bit by bit.? Only a few usable parts left when finally dismantled. I don't advise this method?as you never know when the spring pressure will let go and something goes flying. The other trans required a wedge between the adapter plate and OD to force the parts off the end of the mainshaft spline. 
Of course the gearbox then needs a complete rebuild also because the mainshaft must be replaced. Hope your problem isn't as bad.
Aloha
Perry

-----Original Message-----
From: Ken Wignall <ourxke at hotmail.com>
To: healeys at autox.team.net
Sent: Wed, 21 May 2008 12:41 pm
Subject: [Healeys] Separation of Overdrive from gearbox



We are doing an overhaul on the sideshifter gearbox and overdrive from a 1962
Bt7. We have removed the 8 bolts and go to slide the overdrive from the main
shaft of the gearbox but it won't come off. We understand that there are
splines in the overdrive that must be misaligned somehow, but we just can't
get it off. Any suggestions? The overdrive did not engage prior to removal.
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