[Healeys] overdrive problem

[Michael Salter]

Bob, I looked into installing "O" rings into an accumulator many years ago
but couldn't figure out how to get around the problem presented by the fact
that the accumulator relieves pressure by allowing the cast iron rings to
pass over radial holes in the body.
When I tried them the "O" rings were forced into those pressure relief
holes and tiny pieces were sliced off at each hole location!!
How do the accumulators with "O" rings address that issue?

M

On Fri, Mar 26, 2021 at 10:26 AM Bob Spidell <bspidell at comcast.net> wrote:

> Maybe of interest to some: AFAIK, all O/D accumulators came with metal
> rings, which likely cause or at least contribute to scoring. One of the
> Brit suppliers--probably AHS but I'm not sure--has an accumulator setup
> that uses an O-ring(s) instead of metal rings, which should prevent
> scoring. I rebuilt my O/D a couple years back, and if I'd known of the
> O-ring type I would have installed it. Earlier O/Ds used metal rings in the
> actuator pistons, but later ones had O-rings, and it's logical to conclude
> LdeN went to O-rings there because of excessive scoring of the cases (or,
> possibly, because they were cheaper).
>
> On 3/26/2021 6:03 AM, Michael Salter via Healeys wrote:
>
> 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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