healeys
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Re: Overdrive jumping out

To: Simonlachlan@aol.com, healeys@autox.team.net
Subject: Re: Overdrive jumping out
From: Jerry Wall <jwbn6@iopener.net>
Date: Sun, 16 May 2004 11:36:49 -0500
i agree with you.  adjust throttle switch per workshop manual.  it is working 
exactly the opposite as it should.  i have the same set-up as you -- 3.54 with 
28% od.
Simonlachlan@aol.com wrote:
 > 
 > Hi, I am back from a short break and have yet to apply myself to the
 > overdrive issue. See below
 > ""One for the gurus....
 > Background first:-
 > I have all new overdrive  mechanicals which worked fine until just recently.
 > I have a 28% ratio o/d  unit.
 > Plenty of good clean oil in gearbox, first thing I  checked.
 > Overdrive on/off switch is new and works fine.
 > Switch on  gearlever is not new but works fine.
 > I have not messed around with carbs or  related linkage.
 > Solenoid sounds healthy and engages overdive firmly.
 > (I  have a 3:54 diff, so the revs may seem a little low to you, especially
 > coupled  to a 28% o/d)
 > 
 > So, the symptoms
 > If I am driving along at about  1,900revs with my car in overdrive/4th,
 > she'll jump out of overdrive if I raise  the revs/speed with the accelerator.
 > If I then decelerate back to 1,900 (+/-)  she'll pop back into overdrive.
 > 
 > The question:-
 > Am I right in assuming  that the overdrive switch (on the bulkhead/linked to
 > accelerator linkage) is the  first place to look?
 > And, am I right in believing that it is really the only  logical place to
 > look?""
 > So:-
 > I had a few replies, but - to be honest - everyone has their pet area so
 > there was no agreement..."try solenoid", "try the relay", "try the gear stick
 > switch", "try the solenoid switch" etc. No agreement anywhere! Such is  life!
 > Now, I revert to the original question...is there any way it could be
 > anything other than the throttle switch??
 > Surely if the Overdrive is engaged, increasing the revs cannot get the  (new)
 > solenoid to drop down? Likewise, how can an increase in revs cause the  relay
 > to operate?
 > I am absolutely not denigrating the kind replies - just acknowledging that
 > I'm baffled thus far and hope for explanations!!
 > Yr's,
 > Simon.
 > 
 > **





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