[Fot] Big TR OD and Gearbox rebuilding - reversing

[Marcel Van Mulders]

Thanks. I'm thinking of using a J-type with a push switch actuating a hold
relais, and keeping the gearbox case switch. Changing gear will
automatically disengage the overdrive. I would also mount an override switch
directly between battery12V+ and the solenoid, just in case the push switch
would be dead. But my engine is still on a dyno, 5 weeks before the 1st 2014
saison race...
Marcel, Belgium
-----Oorspronkelijk bericht-----
Van: Larry Young [mailto:cartravel at pobox.com] 
Verzonden: zondag 9 maart 2014 19:54
Aan: Marcel Van Mulders
Onderwerp: Re: [Fot] Big TR OD and Gearbox rebuilding - reversing

The J type has the same unidirectional clutch, so it has the same problem as
the A type.  However, all of these units leak down after a while when the
pump stops.  The A type leaks down more slowly because of all the fluid
stored in the accumulator.  The J type without an accumulator, will leak
down much more quickly (maybe 10 seconds vs. at least several several
minutes).  For example, if you stop, shift to reverse and start backing up,
it will likely be disengaged.  The leak down rate also depends on the
condition of all the various seals within the overdrive. One A type that I
rebuilt would hold pressure for several days, but that was exceptional.
Larry

On 3/9/2014 10:14 AM, Marcel Van Mulders wrote:
> Not quite the same subject : it's very unhealthy to an A-type to 
> reverse the car with the overdrive engaged for some unorthodox reason. 
> Can you wreck a J-type overdrive in the same circumstances?
> Marcel, Belgium.