Hi again Neil,
With all due respects to Steve I would not suspect the accumulator because
it is in the hydraulic circuit ahead of the operating valve.
If the accumulator was leaking badly enough to prevent the overdrive from
engaging you would never see 390 p.s.i. if you are testing at the operating
valve plug with the ball and spring in position.
Although the specified pressure for our units is 470 - 490 p.s.i. I have
never seen one achieve 490 p.s.i. and have found units that operated quite
satisfactorily with pressures as low as 300 p.s.i. hot.
Someone suggested running the car on stands and manually lifting the valve
setting lever. That is how I test for correct operation BUT PLEASE be ware
of that driveshaft spinning next to your right hip. Getting yourself
tangled up in that will ruin your day.
Michael S
BN1 #174
On Wed, Jan 4, 2017 at 6:05 AM, Neil McDonald <nmcd10 at gmail.com> wrote:
> Yesterday I wrote "I have concluded that the most likely cause of my
> problems are low OD fluid levels and/or inadequate opening of the actuating
> valve. Both I can readily deal with."
>
> In off line discussions with Steve Byers I have added a third and ominous
> possibility, a defective accumulator. The good hydraulic pressure already
> confirmed only indicates that the pump is OK because testing was not done
> while trying to engage the OD. My understanding is that OD engagement is
> the accumulator's function and the pump's role is to pressurise the
> accumulator for this task *before* OD engagement. A definitive test of
> accumulator condition seems to be how well it holds pressure after the
> engine is switched off!
> _____________________
> Neil McDonald
>
> Email: nmcd10 at gmail.com
>
>
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--
*If you can't fix it with a hammer, you've got an electrical problem.*
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