[Healeys] test

David Nock healeydoc at gmail.com
Sat Dec 16 13:28:00 MST 2017

Faulty relay. When the relay is faulty the overdrive will work thru the lockdown switch and when you accelerate far enough the switch will open and the overdrive will come out. 

Sent from my iPhone

> On Dec 16, 2017, at 10:49 AM, Bob Spidell <bspidell at comcast.net> wrote:
> I can't think of any failure mode in an OD that would only occur when accelerating.  The pump and accumulator need to maintain a minimum pressure of 350psi or so, so you'd expect a weak pump or leaky accumulator to cause disengagement, or slow engagement, when slow or decelerating.   Throttle switch, relay and solenoid would most likely fail randomly.  I'd replace one at at time--starting with the switch--since it's the cheapest/easiest to replace--then go from there.  I've had both a bad switch and relay cause random disengagement.  If it's not the switch, the relay can be carefully opened-up and the points filed, to prove it's the problem or not before replacing.
> Bob
>> On 12/16/2017 10:17 AM, healeymanjim wrote:
>> this is a test.  overdrive intermittently drops out when accelerating.  no specific conditions, just when accelerating.  may
>> go days without doing this, then will do it every time i accelerate.  question. is it (a) solenoid (b) relay (c) throtlle switch
>> (d) adjustment (e) all of the above.  TIA
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