Ron,
It had been engaging slowly for about a month or so I
thought that I would attack the problem this Winter.
But then I noticed that the Brake master cylinder
needed to be replaced. Following that operation, I
road tested the car and during a short drive (25
miles) the overdrive would not engage. It worked once
or twice on the drive and then not again. All of the
electrical stuff works and the ball in the operating
valve is lifted when the overdrive switch is thrown.
Max
--- "Ronald J. Ray" <ronald-ray@sbcglobal.net> wrote:
> Hi Max,
>
> What is the history of the overdrive unit not
> working?
>
> Did you recently change the transmission/overdrive
> oil and now the overdrive
> unit doesn't engage?
> If so, you may find that all you have to do is drive
> the car with the
> overdrive switch on and wait for the system to clear
> out any air that may be
> in the hydraulic passages. This may take several
> miles of driving.
>
> I am assuming that the electrical components are
> working and that you have
> manually moved the adjustment arm on the passenger
> side of the overdrive in
> an attempt to get the unit to engage. 400 psi
> should be plenty to engage
> the unit.
>
> Another possibility is that the accumulator piston
> rings are in need of
> replacement.
>
>
> Ron
>
>
>
> -----Original Message-----
> From:
>
healeys-bounces+ronald-ray=sbcglobal.net@autox.team.net
>
[mailto:healeys-bounces+ronald-ray=sbcglobal.net@autox.team.net]On
> Behalf Of Maurice Maxwell
> Sent: Monday, January 21, 2008 3:11 PM
> To: Healeys@autox.team.net
> Subject: [Healeys] Help-Low pressure in the
> overdrive unit
>
>
> My overdrive unit will not engage and has an
> operating
> pressure of about 320 pounds pressure at 1000 rpm on
> the tach. Removal of the accumulator spring and
> placing two washers as a ship under the spring
> increased the pressure to about 380 lb pressure at
> 1000 rpm and about 400 lb at 1500 rpm. There was no
> trash on either operating valve ball or the pump
> non-return valve. The oil appeared clean and there
> was no trash in the filter screen. What could be
> the
> most likely cause of the low pressure?
>
> Thanks in advance,
> Max
> 1961 BT7
>
>
>
>
>
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