[Healeys] Separation of Overdrive from gearbox

[Michael Salter]

Hi Ken,
That is not an unusual problem. I believe it is caused by the unidirectional
clutch being heavily preloaded against the gearbox third motion shaft
splines. 
You may find that you can relieve this preload by hammering lightly on the
casing of the overdrive unit in the area of the cone clutch, however be
careful not to crack the aluminium casing. 
To prevent this in the future, before removing the gearbox it is essential
that the vehicle's clutch be depressed as the overdrive is disengaged which
will allow the cone clutch to move to the direct drive condition while the
unidirectional clutch is unloaded.  
Good luck.

Michael Salter
100 (1953)
AHX12 (1953)
Bugeye (1961)
http://www.netbug.net/blogmichael/

-----Original Message-----
From: healeys-bounces+msalter=precisionsportscar.com at autox.team.net
[mailto:healeys-bounces+msalter=precisionsportscar.com at autox.team.net] On
Behalf Of Ken Wignall
Sent: May 21, 2008 6:41 PM
To: healeys at autox.team.net
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.