[Healeys] Overdrive solenoid

[WILLIAM B LAWRENCE]

Piet,

You can check the condition of the overdrive solenoid by testing continuity
and resistance. No continuity in one circuit or another of course indicates
the solenoid is bad. The resistance should by quite low (2-3 ohms) across the
pull in circuit and increase to a much higher value (approximately 20 ohms)
when the hold in circuit is activated. Just push the armature into the
solenoid bore.

Bill Lawrence

> From: pieters at pt.lu
> Date: Mon, 3 Oct 2011 16:33:43 +0200
> To: healeys at autox.team.net
> Subject: [Healeys] Overdrive solenoid
>
> Hi Guys,
>  I have a perplexing problem with my overdrive. It is in good condition
with
> upgraded clutch, accumulator etc. It engages quickly but after a few
minutes
> of driving it starts to jump in and out of overdrive. I don't have a
throttle
> switch fitted. My only suspect it the solenoid. Since there are 2 windings,
> one to engage the overdrive and one to keep it engaged, could it be that
the
> internal switch or winding fault is causing it to "drop out" and then the
> stronger winding immediately re-engages the overdrive? Opinions?
>
>  2nd question is the replacement solenoid. There seems to be a wide variety
of
> prices for this part from all the usual suppliers. Are solenoids all the
same?
> Can anybody recommend which to buy or which to avoid?
>
>  Thanks as always,
> Piet
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