There really isn't a design flaw here. The system will disengage the
overdrive electrically before shifting into reverse via the 3rd/4th
switch. And as already pointed out, the pressure dissipates after the
car sits for a while.
What is happening now, some 43 - 57 years later is a mechanical problem
caused by the return springs weakening over all of those years and
miles. Even a "rebuilt" transmission and overdrive may have not had
those springs replaced and if they were, they may not have been to
exactly the original specification.
>
>
> ----- Original Message ----- From: <wilkmanracing@aol.com>
> To: <healeys@autox.team.net>
> Sent: Sunday, September 19, 2010 4:15 PM
> Subject: [Healeys] OD Design Flaw? (was Munched Overdrive?)
>
>
>> Thanks to everyone who has offered wisdom, advice, help, etc.
>> regarding my
>> "Munched Overdrive" post. I am going to try the hammer tap
>> suggestion and I
>> do plan to drain the O/D to see what comes out. If it's munched, I
>> need to
>> decide whether to have it fixed or to go the Toyota 5-speed route.
>>
>> I do have one other question for the group. When I had my trans and OD
>> rebuilt about 10 years ago, the rebuilder told me to make sure the OD is
>> disengaged before the car is parked. I believe he also mentioned that I
>> should not back the car up if I forget to do this, as it could
>> destroy the OD.
>> My question is this: Why would something as simple as leaving an OD
>> engaged
>> cause such havoc. I'm pretty mechanically wise, but I'm sure a lot
>> of Healey
>> owners in the past have been just plain drivers with no real mechanical
>> knowledge. Someone like my wife would never even think about
>> disengaging the
>> overdrive after every freeway run. Isn't this a serious design flaw
>> that such
>> a simple lapse would lead to such a mechanical disaster?
[demime 1.01d removed an attachment of type text/x-vcard which had a name of
mgcharlie.vcf]
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