[Healeys] Overdrive slow to engage when hot

[rpschauss at gmail.com (Peter Schauss)]

Thomas,

I would start by replacing the O-ring(s) on the accumulator.  You can
do this without removing the gearbox, although you
may have to unbolt the rear gearbox mounts and jack up the gear box in
order to remove the bracket which holds the
overdrive solenoid.

- Peter Schauss
1963 BJ7
1980 MGB

On Mon, Sep 12, 2011 at 3:09 AM, Thomas Willig <twillig at ruda.de> wrote:
> Gentlemen,
>
>
>
> I am facing the problem that the Overdrive on my BN2 is quite slow to
> engage  when the gearbox is hot. Here are the symptoms /parameters:
>
>
>
> 1.    I am using Penrite 30 gearbox oil -a non detergent oil
>
> 2.    I installed a OD pressure gauge that can be read when driving the
> car.
>
> 3.    Gearbox / Engine cold,  pressure is 490 Psi -Looks perfect to me
>
> 4.    OD engages faultlessly
>
> 5.    Gearbox / Engine warm (Engine Oil 200 F) OD pressure 360 Psi -Too
> low.
>
> 6.    The overdrive needs about 4-5 seconds to engage in other words the
> OD pressure takes that long to reach the 360 Psi again.
>
>
>
> ?  Am I facing a worn oil pump? Any advice what I can/should do.
>
>
>
>
>
> Best regards
>
>
>
>
>
> Thomas Willig
>
> BN2L-230649   01. Feb. 1956
> _______________________________________________