[Healeys] overdrive problem

[Michael Salter]

Time this question was put to bed.
1. The throttle switch is not supposed to disengage the overdrive if the
dash switch is in the "OVERDRIVE" position. If it does the system is wired
incorrectly. (BN1s are a little different)
2. Overdrives which slip out, slip, or won't engage WHEN HOT but do work
when cold are invariably suffering from low oil pressure which is almost
always caused by accumulator issues.  The "O" rings on the outside of the
accumulator sleeve can be a problem but in my experience scoring of the
accumulator bore and damage to the rings and piston are a more common cause.
3. Overdrives and gearboxes in Healeys are meant to be lubricated with
engine oil. Decades ago I  wrote to Laycock DeNormanville, back when
letters went in envelopes with stamps, and received a  response from their
engineering department indicating clearly that the oil specified for their
products was specified by the gearbox manufacturer and whatever they
specified was acceptable for the overdrive.
M

On Fri., Mar. 26, 2021, 2:13 a.m. WILLIAM B LAWRENCE via Healeys, <
healeys at autox.team.net> wrote:

> The symptoms I’ve seen and experienced are that the OD will engage and
> function until the oil temp comes up and the viscosity drops off and will
> then fail. I suppose it depends on the degree of degradation of the o-rings.
> ------------------------------
> *From:* Healeys <healeys-bounces at autox.team.net> on behalf of Bob Spidell
> <bspidell at comcast.net>
> *Sent:* Thursday, March 25, 2021 11:14 PM
> *To:* healeys at autox.team.net <healeys at autox.team.net>
> *Subject:* Re: [Healeys] overdrive problem
>
> Sure, but wouldn't faulty O-rings prevent the OD from engaging in the
> first place? Just guessing, but wouldn't a deficient pump cause same
> symptoms?
>
>
> On 3/25/2021 4:07 PM, WILLIAM B LAWRENCE via Healeys wrote:
>
> Sorry, but the Laycock deNormanville overdrive is not supposed to kick
> down automatically. The most common fault that causes the OD to drop out is
> faulty o-rings on the accumulator sleeve. This won’t allow the OD to build
> full operating pressure.
>
> Bill Lawrence
> BN1 #554
> ------------------------------
> *From:* Healeys <healeys-bounces at autox.team.net>
> <healeys-bounces at autox.team.net> on behalf of Kees Oudesluijs via Healeys
> <healeys at autox.team.net> <healeys at autox.team.net>
> *Sent:* Tuesday, March 23, 2021 7:37 AM
> *To:* healeys at autox.team.net <healeys at autox.team.net>
> <healeys at autox.team.net>
> *Subject:* Re: [Healeys] overdrive problem
>
> That is the way it should be when accelerating hard, Kick down!!
>
> Kees Oudesluijs
>
>
> Op 23-3-2021 om 01:06 schreef healeymanjim via Healeys:
> > friends BT7 had o/d quit.  solenoid was bad so replaced it.  now it will
> go into o/d but pop out when accelerating.   any
> > ideas what the cause is and the fix?
>
>
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