Steve: I once had the same problem. Occasionally it would stay in
overdrive. Banging on the OD with a knock-off hammer usually freed it up.
You can bang the overdrive easily from underneath. Jack up the rear so that
one wheel is off the ground. With the gearbox in neutral, try to turn the
wheel backwards as you bang the OD, It won't turn until the OD is released.
This way you will know when it does release. Doing this once or twice isn't
a problem, but it soon becomes a real nuisance if it persists.
My solution was a new cone clutch. Big job, so exhaust the other options
first.
Jim Smith
----- Original Message -----
From: <sbyers@ec.rr.com>
To: <healeys@autox.team.net>
Sent: Tuesday, September 18, 2007 12:52 PM
Subject: Re: [Healeys] Overdrive problem
> Thanks, Dave -
> I rebuilt the overdrive about 1993, but I did not replace the springs. My
> first thought was that the cone clutch might be somehow sticking to the
> brake ring and gradually releasing under tension of the springs in the
> absence of hydraulic pressure. Thus the loud bang/spring sound I heard
> the first time when it released.
>
> Knocking on the housing with a hammer might be a good one-time measure to
> free it up, but since it requires removal of the
> seats/console/carpet/tranny cover to get at the O/D housing, it is not a
> good approach for long. Another overhaul might be in my future......:^P
>
> Cheers!
> Steve
>
>
>
> ---- Dave Russell <rusd@sitestar.net> wrote:
>> It happens sometimes. The cone clutch is disengaged from the OD position
>> by a set of springs. It's engaged by hydraulic pressure. If the clutch
>> facing gets worn or the springs become weak, the clutch may stick in the
>> OD position. Some folks have been able to release the stuck clutch by
>> rapping the OD housing with a lead hammer.
>>
>> As was said, clearing the bleed hole in the operating valve might also
>> cure the problem, it's easy to check. If not, it may be time for a
>> general rebuild & new release springs.
>>
>> Dave Russell
> _______________________________________________
> bluechipracing@snet.net
>
> Healeys@autox.team.net
> http://autox.team.net/mailman/listinfo/healeys
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